mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
efcba75f8a
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@574 be3aeb3a-fb24-0410-a615-afba39da0efa
2364 lines
61 KiB
ArmAsm
2364 lines
61 KiB
ArmAsm
@ vim:filetype=armasm
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@ Memory I/O handlers for Sega/Mega CD emulation
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@ (c) Copyright 2007, Grazvydas "notaz" Ignotas
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.equiv PCM_STEP_SHIFT, 11
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.equiv POLL_LIMIT, 16
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@ jump tables
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.data
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.align 4
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.altmacro
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.macro mk_m68k_jump_table on sz @ operation name, size
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.long m_m68k_&\on&\sz&_bios @ 0x000000 - 0x01ffff
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.long m_m68k_&\on&\sz&_prgbank @ 0x020000 - 0x03ffff
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.long m_&\on&_null, m_&\on&_null @ 0x040000 - 0x07ffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x080000 - 0x0fffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x100000 - 0x17ffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x180000 - 0x1fffff
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.long m_m68k_&\on&\sz&_wordram0_2M @ 0x200000 - 0x21ffff
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.long m_m68k_&\on&\sz&_wordram1_2M @ 0x220000 - 0x23ffff
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.long m_&\on&_null, m_&\on&_null @ 0x240000 - 0x27ffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x280000 - 0x2fffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x300000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x3fffff
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.long m_m68k_&\on&\sz&_bcram_size @ 0x400000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x420000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x4fffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x500000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x5fffff
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.long m_m68k_&\on&\sz&_bcram @ 0x600000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x620000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x6fffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x700000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x7dffff
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.long m_m68k_&\on&\sz&_bcram_reg @ 0x7e0000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x800000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x8fffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x900000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x9fffff
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.long m_m68k_&\on&\sz&_system_io @ 0xa00000 - 0xa1ffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa20000 - 0xa7ffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa80000 - 0xafffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xb00000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xbfffff
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.long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ 0xc00000
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.long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ - 0xcfffff
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xd00000
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.long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xdfffff
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.long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xe00000
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.long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xefffff
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.long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xf00000
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.long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xffffff
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.endm
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.macro mk_s68k_jump_table on sz @ operation name, size
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.long m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg @ 0x000000 - 0x07ffff
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.long m_s68k_&\on&\sz&_wordram_2M @ 0x080000 - 0x09ffff
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.long m_s68k_&\on&\sz&_wordram_2M @ 0x0a0000 - 0x0bffff
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.long m_&\on&_null @ 0x0c0000 - 0x0dffff, 1M area
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.long m_&\on&_null @ 0x0e0000 - 0x0fffff
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.endm
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@ the jumptables themselves.
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m_m68k_read8_table: mk_m68k_jump_table read 8
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m_m68k_read16_table: mk_m68k_jump_table read 16
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m_m68k_read32_table: mk_m68k_jump_table read 32
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m_m68k_write8_table: mk_m68k_jump_table write 8
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m_m68k_write16_table: mk_m68k_jump_table write 16
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m_m68k_write32_table: mk_m68k_jump_table write 32
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m_s68k_read8_table: mk_s68k_jump_table read 8
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m_s68k_read16_table: mk_s68k_jump_table read 16
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m_s68k_read32_table: mk_s68k_jump_table read 32
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m_s68k_write8_table: mk_s68k_jump_table write 8
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m_s68k_write16_table: mk_s68k_jump_table write 16
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m_s68k_write32_table: mk_s68k_jump_table write 32
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m_s68k_decode_write_table:
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.long m_s68k_write8_2M_decode_b0_m0
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.long m_s68k_write16_2M_decode_b0_m0
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.long m_s68k_write32_2M_decode_b0_m0
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.long m_s68k_write8_2M_decode_b0_m1
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.long m_s68k_write16_2M_decode_b0_m1
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.long m_s68k_write32_2M_decode_b0_m1
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.long m_s68k_write8_2M_decode_b0_m2
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.long m_s68k_write16_2M_decode_b0_m2
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.long m_s68k_write32_2M_decode_b0_m2
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.long m_s68k_write8_2M_decode_b1_m0
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.long m_s68k_write16_2M_decode_b1_m0
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.long m_s68k_write32_2M_decode_b1_m0
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.long m_s68k_write8_2M_decode_b1_m1
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.long m_s68k_write16_2M_decode_b1_m1
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.long m_s68k_write32_2M_decode_b1_m1
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.long m_s68k_write8_2M_decode_b1_m2
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.long m_s68k_write16_2M_decode_b1_m2
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.long m_s68k_write32_2M_decode_b1_m2
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@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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.text
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.align 4
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.global PicoMemResetCD
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.global PicoMemResetCDdecode
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.global PicoReadM68k8
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.global PicoReadM68k16
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.global PicoReadM68k32
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.global PicoWriteM68k8
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.global PicoWriteM68k16
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.global PicoWriteM68k32
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.global PicoReadS68k8
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.global PicoReadS68k16
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.global PicoReadS68k32
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.global PicoWriteS68k8
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.global PicoWriteS68k16
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.global PicoWriteS68k32
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@ externs, just for reference
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.extern Pico
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.extern z80Read8
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.extern OtherRead16
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.extern PicoVideoRead
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.extern PicoVideoRead8
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.extern Read_CDC_Host
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.extern m68k_reg_write8
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.extern OtherWrite16
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.extern gfx_cd_read
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.extern s68k_reg_read16
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.extern SRam
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.extern gfx_cd_write16
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.extern s68k_reg_write8
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.extern s68k_poll_adclk
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.extern PicoCpuMS68k
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.extern s68k_poll_detect
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.extern SN76496Write
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.extern m_m68k_read8_misc
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.extern m_m68k_write8_misc
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@ r0=reg3, r1-r3=temp
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.macro mk_update_table on sz @ operation name, size
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@ we only set word-ram handlers
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ldr r1, =m_m68k_&\on&\sz&_table
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ldr r12,=m_s68k_&\on&\sz&_table
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tst r0, #4
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bne 0f @ pmr_8_1M
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@ pmr_8_2M:
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ldr r2, =m_m68k_&\on&\sz&_wordram0_2M
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ldr r3, =m_s68k_&\on&\sz&_wordram_2M
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str r2, [r1, #16*4]
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str r2, [r1, #17*4]
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ldr r2, =m_&\on&_null
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str r3, [r12,#4*4]
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str r3, [r12,#5*4]
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str r2, [r12,#6*4]
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b 9f @ pmr_8_done
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0: @ pmr_8_1M:
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tst r0, #1
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bne 1f @ pmr_8_1M1
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@ pmr_8_1M0:
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ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b0
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ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b0
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str r2, [r1, #16*4]
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str r3, [r1, #17*4]
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ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b1
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.ifeqs "\on", "read"
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ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b1
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str r2, [r12,#4*4]
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str r2, [r12,#5*4]
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.endif
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str r3, [r12,#6*4]
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b 9f @ pmr_8_done
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1: @ pmr_8_1M1:
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ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b1
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ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b1
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str r2, [r1, #16*4]
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str r3, [r1, #17*4]
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ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b0
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.ifeqs "\on", "read"
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ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b0
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str r2, [r12,#4*4]
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str r2, [r12,#5*4]
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.endif
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str r3, [r12,#6*4]
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9: @ pmr_8_done:
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.endm
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PicoMemResetCD: @ r3
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mk_update_table read 8
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mk_update_table read 16
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mk_update_table read 32
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mk_update_table write 8
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mk_update_table write 16
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mk_update_table write 32
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bx lr
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PicoMemResetCDdecode: @reg3
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tst r0, #4
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bxeq lr @ we should not be called in 2M mode
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ldr r1, =m_s68k_write8_table
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ldr r3, =m_s68k_decode_write_table
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and r2, r0, #0x18
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mov r2, r2, lsr #3
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cmp r2, #3
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moveq r2, #2 @ mode3 is same as mode2?
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tst r0, #1
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addeq r2, r2, #3 @ bank1 (r2=0..5)
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add r2, r2, r2, lsl #1 @ *= 3
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add r2, r3, r2, lsl #2
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ldmia r2, {r0,r3,r12}
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str r0, [r1, #4*4]
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str r0, [r1, #5*4]
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str r3, [r1, #4*4+8*4]
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str r3, [r1, #5*4+8*4]
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str r12,[r1, #4*4+8*4*2]
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str r12,[r1, #5*4+8*4*2]
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bx lr
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.pool
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@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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.macro mk_entry_m68k table
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ldr r2, =\table
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bic r0, r0, #0xff000000
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and r3, r0, #0x00fe0000
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ldr pc, [r2, r3, lsr #15]
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.endm
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PicoReadM68k8: @ u32 a
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mk_entry_m68k m_m68k_read8_table
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PicoReadM68k16: @ u32 a
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mk_entry_m68k m_m68k_read16_table
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PicoReadM68k32: @ u32 a
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mk_entry_m68k m_m68k_read32_table
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PicoWriteM68k8: @ u32 a, u8 d
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mk_entry_m68k m_m68k_write8_table
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PicoWriteM68k16: @ u32 a, u16 d
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mk_entry_m68k m_m68k_write16_table
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PicoWriteM68k32: @ u32 a, u32 d
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mk_entry_m68k m_m68k_write32_table
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.macro mk_entry_s68k on sz
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bic r0, r0, #0xff000000
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cmp r0, #0x00080000
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blt m_s68k_&\on&\sz&_prg
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cmp r0, #0x000e0000
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ldrlt r2, =m_s68k_&\on&\sz&_table
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andlt r3, r0, #0x000e0000
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ldrlt pc, [r2, r3, lsr #15]
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mov r3, #0x00ff0000
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orr r3, r3, #0x00008000
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cmp r0, r3
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bge m_s68k_&\on&\sz&_regs
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cmp r0, #0x00ff0000
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bge m_s68k_&\on&\sz&_pcm
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cmp r0, #0x00fe0000
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bge m_s68k_&\on&\sz&_backup
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mov r0, #0
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bx lr
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.endm
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PicoReadS68k8: @ u32 a
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mk_entry_s68k read 8
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PicoReadS68k16: @ u32 a
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mk_entry_s68k read 16
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PicoReadS68k32: @ u32 a
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mk_entry_s68k read 32
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PicoWriteS68k8: @ u32 a, u8 d
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mk_entry_s68k write 8
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PicoWriteS68k16: @ u32 a, u16 d
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mk_entry_s68k write 16
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PicoWriteS68k32: @ u32 a, u32 d
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mk_entry_s68k write 32
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.pool
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@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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@ utilities
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@ r0=addr[in,out], r1,r2=tmp
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.macro cell_map
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ands r1, r0, #0x01c000
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ldrne pc, [pc, r1, lsr #12]
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beq 0f @ most common?
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.long 0f
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.long 0f
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.long 0f
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.long 0f
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.long 1f
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.long 1f
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.long 2f
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.long 3f
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1: @ x16 cells
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and r1, r0, #0x7e00 @ col
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and r2, r0, #0x01fc @ row
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orr r2, r2, #0x0400
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orr r1, r2, r1, ror #13
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b 9f
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2: @ x8 cells
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and r1, r0, #0x3f00 @ col
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and r2, r0, #0x00fc @ row
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orr r2, r2, #0x0600
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orr r1, r2, r1, ror #12
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b 9f
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3: @ x4 cells
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and r1, r0, #0x1f80 @ col
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and r2, r0, #0x007c @ row
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orr r1, r2, r1, ror #11
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and r2, r0,#0x1e000
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orr r1, r1, r2, lsr #6
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b 9f
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0: @ x32 cells
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and r1, r0, #0xfc00 @ col
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and r2, r0, #0x03fc @ row
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orr r1, r2, r1, ror #14
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9:
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and r0, r0, #3
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orr r0, r0, r1, ror #26 @ rol 4+2
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.endm
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@ r0=prt1, r1=ptr2; unaligned ptr MUST be r0
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.macro m_read32_gen
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tst r0, #2
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ldrneh r0, [r1, r0]!
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ldrneh r1, [r1, #2]
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ldreq r0, [r1, r0]
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moveq r0, r0, ror #16
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orrne r0, r1, r0, lsl #16
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.endm
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@ r0=prt1, r1=data, r2=ptr2; unaligned ptr MUST be r0
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.macro m_write32_gen
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tst r0, #2
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mov r1, r1, ror #16
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strneh r1, [r2, r0]!
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movne r1, r1, lsr #16
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strneh r1, [r2, #2]
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streq r1, [r2, r0]
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.endm
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@
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.macro bcram_reg_rw is_read addr_check
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rsb r0, r0, #0x800000
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ldr r2, =(Pico+0x22200)
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cmp r0, #(0x800000-\addr_check)
|
|
ldreq r2, [r2]
|
|
.if \is_read
|
|
movne r0, #0
|
|
.endif
|
|
bxne lr
|
|
add r2, r2, #0x110000
|
|
add r2, r2, #0x002200
|
|
.if \is_read
|
|
ldrb r0, [r2, #0x18] @ Pico_mcd->m.bcram_reg
|
|
.else
|
|
strb r1, [r2, #0x18]
|
|
.endif
|
|
bx lr
|
|
.endm
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
m_read_null:
|
|
mov r0, #0
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_bios:
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #0xfe0000
|
|
ldr r1, [r1]
|
|
eor r0, r0, #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_prgbank:
|
|
ldr r1, =(Pico+0x22200)
|
|
eor r0, r0, #1
|
|
ldr r1, [r1]
|
|
mov r2, #0x110000
|
|
orr r3, r2, #0x002200
|
|
ldr r3, [r1, r3]
|
|
ldr r2, [r1, r2]
|
|
and r3, r3, #0x00030000
|
|
cmp r3, #0x00010000 @ have bus or in reset state?
|
|
moveq r0, #0
|
|
bxeq lr
|
|
and r2, r2, #0xc0000000 @ r3 & 0xC0
|
|
add r1, r1, r2, lsr #12
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_wordram0_2M: @ 0x200000 - 0x21ffff
|
|
m_m68k_read8_wordram1_2M: @ 0x220000 - 0x23ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000
|
|
ldr r1, [r1]
|
|
eor r0, r0, #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_wordram0_1M_b0: @ 0x200000 - 0x21ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000
|
|
ldr r1, [r1]
|
|
eor r0, r0, #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_wordram0_1M_b1: @ 0x200000 - 0x21ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000
|
|
ldr r1, [r1]
|
|
eor r0, r0, #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0c0000
|
|
ldr r1, [r1]
|
|
eor r0, r0, #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0e0000
|
|
ldr r1, [r1]
|
|
eor r0, r0, #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_bcram_size: @ 0x400000
|
|
sub r0, r0, #1
|
|
cmp r0, #0x400000
|
|
ldreq r1, =SRam
|
|
mov r0, #0
|
|
ldreq r1, [r1]
|
|
bxne lr
|
|
tst r1, r1
|
|
movne r0, #3 @ pretend to be a 64k cart (8<<3)
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_bcram: @ 0x600000 - 0x61ffff
|
|
ldr r1, =SRam
|
|
bic r0, r0, #0xfe0000
|
|
ldr r1, [r1]
|
|
mov r0, r0, lsr #1
|
|
tst r1, r1
|
|
moveq r0, #0
|
|
bxeq lr
|
|
add r1, r1, #0x2000
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read8_bcram_reg: @ 0x7fffff
|
|
bcram_reg_rw 1, 0x7fffff
|
|
|
|
|
|
m_m68k_read8_system_io:
|
|
bic r2, r0, #0xfe0000
|
|
bic r2, r2, #0x3f
|
|
cmp r2, #0x012000
|
|
bne m_m68k_read8_misc @ now from Pico/Memory.s
|
|
|
|
ldr r1, =(Pico+0x22200)
|
|
and r0, r0, #0x3f
|
|
ldr r1, [r1] @ Pico.mcd (used everywhere)
|
|
cmp r0, #0x0e
|
|
ldrlt pc, [pc, r0, lsl #2]
|
|
b m_m68k_read8_hi
|
|
.long m_m68k_read8_r00
|
|
.long m_m68k_read8_r01
|
|
.long m_m68k_read8_r02
|
|
.long m_m68k_read8_r03
|
|
.long m_m68k_read8_r04
|
|
.long m_read_null @ unused bits
|
|
.long m_m68k_read8_r06
|
|
.long m_m68k_read8_r07
|
|
.long m_m68k_read8_r08
|
|
.long m_m68k_read8_r09
|
|
.long m_read_null @ reserved
|
|
.long m_read_null
|
|
.long m_m68k_read8_r0c
|
|
.long m_m68k_read8_r0d
|
|
m_m68k_read8_r00:
|
|
add r1, r1, #0x110000
|
|
ldr r0, [r1, #0x30]
|
|
and r0, r0, #0x04000000 @ we need irq2 mask state
|
|
mov r0, r0, lsr #19
|
|
bx lr
|
|
m_m68k_read8_r01:
|
|
add r1, r1, #0x110000
|
|
add r1, r1, #0x002200
|
|
ldrb r0, [r1, #2] @ Pico_mcd->m.busreq
|
|
bx lr
|
|
m_m68k_read8_r02:
|
|
add r1, r1, #0x110000
|
|
ldrb r0, [r1, #2]
|
|
bx lr
|
|
m_m68k_read8_r03:
|
|
add r1, r1, #0x110000
|
|
ldrb r0, [r1, #3]
|
|
add r1, r1, #0x002200
|
|
ldr r1, [r1, #4]
|
|
and r0, r0, #0xc7
|
|
tst r1, #2 @ DMNA pending?
|
|
bxeq lr
|
|
bic r0, r0, #1
|
|
orr r0, r0, #2
|
|
bx lr
|
|
m_m68k_read8_r04:
|
|
add r1, r1, #0x110000
|
|
ldrb r0, [r1, #4]
|
|
bx lr
|
|
m_m68k_read8_r06:
|
|
ldrb r0, [r1, #0x73] @ IRQ vector
|
|
bx lr
|
|
m_m68k_read8_r07:
|
|
ldrb r0, [r1, #0x72]
|
|
bx lr
|
|
m_m68k_read8_r08:
|
|
mov r0, #0
|
|
bl Read_CDC_Host @ TODO: make it local
|
|
mov r0, r0, lsr #8
|
|
bx lr
|
|
m_m68k_read8_r09:
|
|
mov r0, #0
|
|
b Read_CDC_Host
|
|
m_m68k_read8_r0c:
|
|
add r1, r1, #0x110000
|
|
add r1, r1, #0x002200
|
|
ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch
|
|
mov r0, r0, lsr #24
|
|
bx lr
|
|
m_m68k_read8_r0d:
|
|
add r1, r1, #0x110000
|
|
add r1, r1, #0x002200
|
|
ldr r0, [r1, #0x14]
|
|
mov r0, r0, lsr #16
|
|
bx lr
|
|
m_m68k_read8_hi:
|
|
cmp r0, #0x30
|
|
movge r0, #0
|
|
bxeq lr
|
|
add r1, r1, #0x110000
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
/*
|
|
m_m68k_read8_misc:
|
|
bic r2, r0, #0x00ff
|
|
bic r2, r2, #0xbf00
|
|
cmp r2, #0xa00000 @ Z80 RAM?
|
|
beq z80Read8
|
|
@ ldreq r2, =z80Read8
|
|
@ bxeq r2
|
|
stmfd sp!,{r0,lr}
|
|
bic r0, r0, #1
|
|
mov r1, #8
|
|
bl OtherRead16 @ non-MCD version should be ok too
|
|
ldmfd sp!,{r1,lr}
|
|
tst r1, #1
|
|
moveq r0, r0, lsr #8
|
|
bx lr
|
|
*/
|
|
|
|
m_m68k_read8_vdp:
|
|
tst r0, #0x70000
|
|
tsteq r0, #0x000e0
|
|
bxne lr @ invalid read
|
|
b PicoVideoRead8
|
|
|
|
|
|
m_m68k_read8_ram:
|
|
ldr r1, =Pico
|
|
bic r0, r0, #0xff0000
|
|
eor r0, r0, #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
m_m68k_read16_bios:
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #0xfe0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_prgbank:
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r1, [r1]
|
|
mov r2, #0x110000
|
|
orr r3, r2, #0x002200
|
|
ldr r3, [r1, r3]
|
|
ldr r2, [r1, r2]
|
|
and r3, r3, #0x00030000
|
|
cmp r3, #0x00010000 @ have bus or in reset state?
|
|
moveq r0, #0
|
|
bxeq lr
|
|
and r2, r2, #0xc0000000 @ r3 & 0xC0
|
|
add r1, r1, r2, lsr #12
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_wordram0_2M: @ 0x200000 - 0x21ffff
|
|
m_m68k_read16_wordram1_2M: @ 0x220000 - 0x23ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_wordram0_1M_b0: @ 0x200000 - 0x21ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_wordram0_1M_b1: @ 0x200000 - 0x21ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged
|
|
@ Warning: read32 relies on NOT using r3 and r12 here
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0c0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0e0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_bcram_size: @ 0x400000
|
|
cmp r0, #0x400000
|
|
ldreq r1, =SRam
|
|
mov r0, #0
|
|
ldreq r1, [r1]
|
|
bxne lr
|
|
tst r1, r1
|
|
movne r0, #3 @ pretend to be a 64k cart
|
|
bx lr
|
|
|
|
|
|
@ m_m68k_read16_bcram: @ 0x600000 - 0x61ffff
|
|
.equiv m_m68k_read16_bcram, m_m68k_read8_bcram
|
|
|
|
|
|
m_m68k_read16_bcram_reg: @ 0x7fffff
|
|
bcram_reg_rw 1, 0x7ffffe
|
|
|
|
|
|
m_m68k_read16_system_io:
|
|
bic r1, r0, #0xfe0000
|
|
bic r1, r1, #0x3f
|
|
cmp r1, #0x012000
|
|
bne m_m68k_read16_misc
|
|
|
|
m_m68k_read16_m68k_regs:
|
|
ldr r1, =(Pico+0x22200)
|
|
and r0, r0, #0x3e
|
|
ldr r1, [r1] @ Pico.mcd (used everywhere)
|
|
cmp r0, #0x0e
|
|
ldrlt pc, [pc, r0, lsl #1]
|
|
b m_m68k_read16_hi
|
|
.long m_m68k_read16_r00
|
|
.long m_m68k_read16_r02
|
|
.long m_m68k_read16_r04
|
|
.long m_m68k_read16_r06
|
|
.long m_m68k_read16_r08
|
|
.long m_read_null @ reserved
|
|
.long m_m68k_read16_r0c
|
|
m_m68k_read16_r00:
|
|
add r1, r1, #0x110000
|
|
ldr r0, [r1, #0x30]
|
|
add r1, r1, #0x002200
|
|
ldrb r1, [r1, #2] @ Pico_mcd->m.busreq
|
|
and r0, r0, #0x04000000 @ we need irq2 mask state
|
|
orr r0, r1, r0, lsr #11
|
|
bx lr
|
|
m_m68k_read16_r02:
|
|
add r1, r1, #0x110000
|
|
ldrb r0, [r1, #2]
|
|
ldrb r2, [r1, #3]
|
|
add r1, r1, #0x002200
|
|
ldr r1, [r1, #4]
|
|
and r2, r2, #0xc7
|
|
orr r0, r2, r0, lsl #8
|
|
tst r1, #2 @ DMNA pending?
|
|
bxeq lr
|
|
bic r0, r0, #1
|
|
orr r0, r0, #2
|
|
bx lr
|
|
m_m68k_read16_r04:
|
|
add r1, r1, #0x110000
|
|
ldrb r0, [r1, #4]
|
|
mov r0, r0, lsl #8
|
|
bx lr
|
|
m_m68k_read16_r06:
|
|
ldrh r0, [r1, #0x72] @ IRQ vector
|
|
bx lr
|
|
m_m68k_read16_r08:
|
|
mov r0, #0
|
|
b Read_CDC_Host
|
|
m_m68k_read16_r0c:
|
|
add r1, r1, #0x110000
|
|
add r1, r1, #0x002200
|
|
ldr r0, [r1, #0x14]
|
|
mov r0, r0, lsr #16
|
|
bx lr
|
|
m_m68k_read16_hi:
|
|
cmp r0, #0x30
|
|
addlt r1, r1, #0x110000
|
|
ldrlth r1, [r1, r0]
|
|
movge r0, #0
|
|
bxge lr
|
|
mov r0, r1, lsr #8
|
|
and r1, r1, #0xff
|
|
orr r0, r0, r1, lsl #8
|
|
bx lr
|
|
|
|
|
|
m_m68k_read16_misc:
|
|
bic r0, r0, #1
|
|
mov r1, #16
|
|
b OtherRead16
|
|
|
|
|
|
m_m68k_read16_vdp:
|
|
tst r0, #0x70000
|
|
tsteq r0, #0x000e0
|
|
bxne lr @ invalid read
|
|
bic r0, r0, #1
|
|
b PicoVideoRead
|
|
|
|
|
|
m_m68k_read16_ram:
|
|
ldr r1, =Pico
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #1
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
m_m68k_read32_bios:
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #0xfe0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
m_read32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_prgbank:
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r1, [r1]
|
|
mov r2, #0x110000
|
|
orr r3, r2, #0x002200
|
|
ldr r3, [r1, r3]
|
|
ldr r2, [r1, r2]
|
|
and r3, r3, #0x00030000
|
|
cmp r3, #0x00010000 @ have bus or in reset state?
|
|
moveq r0, #0
|
|
bxeq lr
|
|
and r2, r2, #0xc0000000 @ r3 & 0xC0
|
|
add r1, r1, r2, lsr #12
|
|
m_read32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_wordram0_2M: @ 0x200000 - 0x21ffff
|
|
m_m68k_read32_wordram1_2M: @ 0x220000 - 0x23ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
m_read32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_wordram0_1M_b0: @ 0x200000 - 0x21ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
m_read32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_wordram0_1M_b1: @ 0x200000 - 0x21ffff
|
|
ldr r1, =(Pico+0x22200)
|
|
sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
m_read32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged
|
|
tst r0, #2
|
|
bne m_m68k_read32_wordram1_1M_b0_unal
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0c0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
m_read32_gen
|
|
bx lr
|
|
m_m68k_read32_wordram1_1M_b0_unal:
|
|
@ hopefully this doesn't happen too often
|
|
mov r12,lr
|
|
mov r3, r0
|
|
bl m_m68k_read16_wordram1_1M_b0 @ must not trash r12 and r3
|
|
add r1, r3, #2
|
|
mov r3, r0
|
|
mov r0, r1
|
|
bl m_m68k_read16_wordram1_1M_b0
|
|
orr r0, r0, r3, lsl #16
|
|
bx r12
|
|
|
|
|
|
m_m68k_read32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged
|
|
tst r0, #2
|
|
bne m_m68k_read32_wordram1_1M_b1_unal
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0e0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
m_read32_gen
|
|
bx lr
|
|
m_m68k_read32_wordram1_1M_b1_unal:
|
|
mov r12,lr
|
|
mov r3, r0
|
|
bl m_m68k_read16_wordram1_1M_b1 @ must not trash r12 and r3
|
|
add r1, r3, #2
|
|
mov r3, r0
|
|
mov r0, r1
|
|
bl m_m68k_read16_wordram1_1M_b1
|
|
orr r0, r0, r3, lsl #16
|
|
bx r12
|
|
|
|
|
|
m_m68k_read32_bcram_size: @ 0x400000
|
|
cmp r0, #0x400000
|
|
ldreq r1, =SRam
|
|
mov r0, #0
|
|
ldreq r1, [r1]
|
|
bxne lr
|
|
tst r1, r1
|
|
movne r0, #0x30000 @ pretend to be a 64k cart
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_bcram: @ 0x600000 - 0x61ffff, not likely to be called
|
|
mov r12,lr
|
|
add r3, r0, #2
|
|
bl m_m68k_read8_bcram
|
|
mov r1, r0
|
|
mov r0, r3
|
|
mov r3, r1
|
|
bl m_m68k_read8_bcram
|
|
orr r0, r0, r3, lsl #16
|
|
bx r12
|
|
|
|
|
|
m_m68k_read32_bcram_reg: @ 0x7fffff
|
|
bcram_reg_rw 1, 0x7ffffc
|
|
|
|
|
|
@ it is not very practical to use long access on hw registers, so I assume it is not used too much.
|
|
m_m68k_read32_system_io:
|
|
bic r1, r0, #0xfe0000
|
|
bic r1, r1, #0x3f
|
|
cmp r1, #0x012000
|
|
bne m_m68k_read32_misc
|
|
and r1, r0, #0x3e
|
|
cmp r1, #0x0e
|
|
blt m_m68k_read32_misc
|
|
cmp r1, #0x30
|
|
movge r0, #0
|
|
bxge lr
|
|
@ I have seen the range 0x0e-0x2f accessed quite frequently with long i/o, so here is some code for that
|
|
mov r0, r1
|
|
ldr r1, =(Pico+0x22200)
|
|
mov r2, #0xff
|
|
ldr r1, [r1]
|
|
orr r2, r2, r2, lsl #16
|
|
add r1, r1, #0x110000
|
|
m_read32_gen
|
|
and r1, r2, r0 @ data is big-endian read as little, have to byteswap
|
|
and r0, r2, r0, lsr #8
|
|
orr r0, r0, r1, lsl #8
|
|
bx lr
|
|
|
|
m_m68k_read32_misc:
|
|
add r1, r0, #2
|
|
stmfd sp!,{r1,lr}
|
|
bl m_m68k_read16_system_io
|
|
swp r0, r0, [sp]
|
|
bl m_m68k_read16_system_io
|
|
ldmfd sp!,{r1,lr}
|
|
orr r0, r0, r1, lsl #16
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_vdp:
|
|
tst r0, #0x70000
|
|
tsteq r0, #0x000e0
|
|
bxne lr @ invalid read
|
|
bic r0, r0, #1
|
|
add r1, r0, #2
|
|
stmfd sp!,{r1,lr}
|
|
bl PicoVideoRead
|
|
swp r0, r0, [sp]
|
|
bl PicoVideoRead
|
|
ldmfd sp!,{r1,lr}
|
|
orr r0, r0, r1, lsl #16
|
|
bx lr
|
|
|
|
|
|
m_m68k_read32_ram:
|
|
ldr r1, =Pico
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #1
|
|
m_read32_gen
|
|
bx lr
|
|
|
|
.pool
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
m_write_null:
|
|
m_m68k_write8_bios:
|
|
m_m68k_write8_bcram_size: @ 0x400000
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_prgbank:
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #1
|
|
ldr r2, [r2]
|
|
mov r12,#0x110000
|
|
orr r3, r12, #0x002200
|
|
ldr r3, [r2, r3]
|
|
ldr r12,[r2, r12]
|
|
and r3, r3, #0x00030000
|
|
cmp r3, #0x00010000 @ have bus or in reset state?
|
|
bxeq lr
|
|
and r12,r12,#0xc0000000 @ r3 & 0xC0
|
|
add r2, r2, r12, lsr #12
|
|
strb r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_wordram0_2M: @ 0x200000 - 0x21ffff
|
|
m_m68k_write8_wordram1_2M: @ 0x220000 - 0x23ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000
|
|
ldr r2, [r2]
|
|
eor r0, r0, #1
|
|
strb r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_wordram0_1M_b0: @ 0x200000 - 0x21ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000
|
|
ldr r2, [r2]
|
|
eor r0, r0, #1
|
|
strb r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_wordram0_1M_b1: @ 0x200000 - 0x21ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000
|
|
ldr r2, [r2]
|
|
eor r0, r0, #1
|
|
strb r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged
|
|
mov r3, r1
|
|
cell_map
|
|
ldr r2, =(Pico+0x22200)
|
|
add r0, r0, #0x0c0000
|
|
ldr r2, [r2]
|
|
eor r0, r0, #1
|
|
strb r3, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged
|
|
mov r3, r1
|
|
cell_map
|
|
ldr r2, =(Pico+0x22200)
|
|
add r0, r0, #0x0e0000
|
|
ldr r2, [r2]
|
|
eor r0, r0, #1
|
|
strb r3, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_bcram: @ 0x600000 - 0x61ffff
|
|
@ can't use r3 or r12, because of write32
|
|
ldr r2, =SRam
|
|
bic r0, r0, #0xfe0000
|
|
ldr r2, [r2]
|
|
tst r2, r2
|
|
bxeq lr
|
|
add r0, r2, r0, lsr #1
|
|
ldr r2, =(Pico+0x22200)
|
|
ldr r2, [r2]
|
|
add r0, r0, #0x2000
|
|
add r2, r2, #0x110000
|
|
add r2, r2, #0x002200
|
|
ldr r2, [r2, #0x18]
|
|
tst r2, #1 @ check bcram reg
|
|
bxeq lr
|
|
strb r1, [r0]
|
|
ldr r2, =SRam
|
|
mov r0, #1
|
|
strb r0, [r2, #0x0e] @ SRam.changed = 1
|
|
bx lr
|
|
|
|
|
|
m_m68k_write8_bcram_reg: @ 0x7fffff
|
|
bcram_reg_rw 0, 0x7fffff
|
|
|
|
|
|
m_m68k_write8_system_io:
|
|
bic r2, r0, #0xfe0000
|
|
bic r2, r2, #0x3f
|
|
cmp r2, #0x012000
|
|
beq m68k_reg_write8
|
|
mov r2, #8
|
|
@ b OtherWrite8
|
|
b m_m68k_write8_misc
|
|
|
|
|
|
m_m68k_write8_vdp:
|
|
tst r0, #0x70000
|
|
tsteq r0, #0x000e0
|
|
bxne lr @ invalid
|
|
and r2, r0, #0x19
|
|
cmp r2, #0x11
|
|
andeq r0, r1, #0xff
|
|
beq SN76496Write
|
|
and r1, r1, #0xff
|
|
orr r1, r1, r1, lsl #8 @ byte access gets mirrored
|
|
b PicoVideoWrite
|
|
|
|
|
|
m_m68k_write8_ram:
|
|
ldr r2, =Pico
|
|
bic r0, r0, #0xff0000
|
|
eor r0, r0, #1
|
|
strb r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
m_m68k_write16_bios:
|
|
m_m68k_write16_bcram_size: @ 0x400000
|
|
bx lr
|
|
|
|
|
|
m_m68k_write16_prgbank:
|
|
ldr r2, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r2, [r2]
|
|
mov r12,#0x110000
|
|
orr r3, r12, #0x002200
|
|
ldr r3, [r2, r3]
|
|
ldr r12,[r2, r12]
|
|
and r3, r3, #0x00030000
|
|
cmp r3, #0x00010000 @ have bus or in reset state?
|
|
bxeq lr
|
|
and r12,r12,#0xc0000000 @ r3 & 0xC0
|
|
add r2, r2, r12, lsr #12
|
|
strh r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write16_wordram0_2M: @ 0x200000 - 0x21ffff
|
|
m_m68k_write16_wordram1_2M: @ 0x220000 - 0x23ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
strh r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write16_wordram0_1M_b0: @ 0x200000 - 0x21ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
strh r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write16_wordram0_1M_b1: @ 0x200000 - 0x21ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
strh r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged
|
|
@ Warning: write32 relies on NOT using r12 and and keeping data in r3
|
|
mov r3, r1
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0c0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
strh r3, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged
|
|
mov r3, r1
|
|
cell_map
|
|
ldr r1, =(Pico+0x22200)
|
|
add r0, r0, #0x0e0000
|
|
ldr r1, [r1]
|
|
bic r0, r0, #1
|
|
strh r3, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
@ m_m68k_write16_bcram: @ 0x600000 - 0x61ffff
|
|
.equiv m_m68k_write16_bcram, m_m68k_write8_bcram
|
|
|
|
|
|
m_m68k_write16_bcram_reg: @ 0x7fffff
|
|
bcram_reg_rw 0, 0x7ffffe
|
|
|
|
|
|
m_m68k_write16_system_io:
|
|
bic r0, r0, #1
|
|
bic r2, r0, #0xfe0000
|
|
bic r2, r2, #0x3f
|
|
cmp r2, #0x012000
|
|
bne OtherWrite16
|
|
|
|
m_m68k_write16_regs:
|
|
and r0, r0, #0x3e
|
|
cmp r0, #0x0e
|
|
beq m_m68k_write16_regs_spec
|
|
and r3, r1, #0xff
|
|
add r2, r0, #1
|
|
stmfd sp!,{r2,r3,lr}
|
|
mov r1, r1, lsr #8
|
|
bl m68k_reg_write8
|
|
ldmfd sp!,{r0,r1,lr}
|
|
b m68k_reg_write8
|
|
|
|
m_m68k_write16_regs_spec: @ special case
|
|
ldr r2, =(Pico+0x22200)
|
|
ldr r3, =s68k_poll_adclk
|
|
mov r0, #0x110000
|
|
ldr r2, [r2]
|
|
add r0, r0, #0x00000e
|
|
mov r1, r1, lsr #8
|
|
strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0x0e] = d >> 8;
|
|
ldr r2, [r3]
|
|
mov r1, #0
|
|
and r2, r2, #0xfe
|
|
cmp r2, #0x0e
|
|
bxne lr
|
|
ldr r0, =PicoCpuCS68k
|
|
str r1, [r0, #0x58] @ push s68k out of stopped state
|
|
str r1, [r3]
|
|
bx lr
|
|
|
|
|
|
m_m68k_write16_vdp:
|
|
tst r0, #0x70000
|
|
tsteq r0, #0x000e0
|
|
bxne lr @ invalid
|
|
bic r0, r0, #1
|
|
and r2, r0, #0x18
|
|
cmp r2, #0x10
|
|
bne PicoVideoWrite
|
|
and r0, r1, #0xff
|
|
b SN76496Write @ lsb goes to 0x11
|
|
|
|
|
|
m_m68k_write16_ram:
|
|
ldr r2, =Pico
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #1
|
|
strh r1, [r2, r0]
|
|
bx lr
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
m_m68k_write32_bios:
|
|
m_m68k_write32_bcram_size: @ 0x400000
|
|
bx lr
|
|
|
|
|
|
m_m68k_write32_prgbank:
|
|
ldr r2, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r2, [r2]
|
|
mov r12,#0x110000
|
|
orr r3, r12, #0x002200
|
|
ldr r3, [r2, r3]
|
|
ldr r12,[r2, r12]
|
|
and r3, r3, #0x00030000
|
|
cmp r3, #0x00010000 @ have bus or in reset state?
|
|
bxeq lr
|
|
and r12,r12,#0xc0000000 @ r3 & 0xC0
|
|
add r2, r2, r12, lsr #12
|
|
m_write32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_write32_wordram0_2M: @ 0x200000 - 0x21ffff
|
|
m_m68k_write32_wordram1_2M: @ 0x220000 - 0x23ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
m_write32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_write32_wordram0_1M_b0: @ 0x200000 - 0x21ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
m_write32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_write32_wordram0_1M_b1: @ 0x200000 - 0x21ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
m_write32_gen
|
|
bx lr
|
|
|
|
|
|
m_m68k_write32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged
|
|
tst r0, #2
|
|
bne m_m68k_write32_wordram1_1M_b0_unal
|
|
mov r3, r1
|
|
cell_map
|
|
ldr r2, =(Pico+0x22200)
|
|
add r0, r0, #0x0c0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
mov r1, r3
|
|
m_write32_gen
|
|
bx lr
|
|
m_m68k_write32_wordram1_1M_b0_unal:
|
|
@ hopefully this doesn't happen too often
|
|
add r12,r0, #2
|
|
mov r1, r1, ror #16
|
|
stmfd sp!,{lr}
|
|
bl m_m68k_write16_wordram1_1M_b0 @ must not trash r12 and keep data in r3
|
|
ldmfd sp!,{lr}
|
|
mov r0, r12
|
|
mov r1, r3, lsr #16
|
|
b m_m68k_write16_wordram1_1M_b0
|
|
|
|
|
|
m_m68k_write32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged
|
|
tst r0, #2
|
|
bne m_m68k_write32_wordram1_1M_b1_unal
|
|
mov r3, r1
|
|
cell_map
|
|
ldr r2, =(Pico+0x22200)
|
|
add r0, r0, #0x0e0000
|
|
ldr r2, [r2]
|
|
bic r0, r0, #1
|
|
mov r1, r3
|
|
m_write32_gen
|
|
bx lr
|
|
m_m68k_write32_wordram1_1M_b1_unal:
|
|
add r12,r0, #2
|
|
mov r1, r1, ror #16
|
|
stmfd sp!,{lr}
|
|
bl m_m68k_write16_wordram1_1M_b1 @ same as above
|
|
ldmfd sp!,{lr}
|
|
mov r0, r12
|
|
mov r1, r3, lsr #16
|
|
b m_m68k_write16_wordram1_1M_b1
|
|
|
|
|
|
m_m68k_write32_bcram: @ 0x600000 - 0x61ffff, not likely to be called
|
|
mov r12,lr
|
|
add r3, r0, #2
|
|
mov r1, r1, ror #16
|
|
bl m_m68k_write8_bcram
|
|
mov r0, r3
|
|
mov r1, r1, ror #16
|
|
bl m_m68k_write8_bcram
|
|
bx r12
|
|
|
|
|
|
m_m68k_write32_bcram_reg: @ 0x7fffff
|
|
bcram_reg_rw 0, 0x7ffffc
|
|
|
|
|
|
|
|
@ it is not very practical to use long access on hw registers, so I assume it is not used too much.
|
|
m_m68k_write32_system_io:
|
|
bic r2, r0, #0xfe0000
|
|
bic r2, r2, #0x3f
|
|
cmp r2, #0x012000
|
|
bne m_m68k_write32_misc
|
|
and r2, r0, #0x3e
|
|
cmp r2, #0x20
|
|
bxge lr
|
|
cmp r2, #0x10
|
|
bge m_m68k_write32_regs_comm
|
|
cmp r2, #0x0c
|
|
bge m_m68k_write32_regs_spec @ hits the nasty comm reg qiurk
|
|
|
|
bic r0, r0, #1
|
|
stmfd sp!,{r0,r1,lr}
|
|
mov r1, r1, lsr #24
|
|
bl m68k_reg_write8
|
|
ldr r0, [sp]
|
|
ldr r1, [sp, #4]
|
|
add r0, r0, #1
|
|
mov r1, r1, lsr #16
|
|
bl m68k_reg_write8
|
|
ldr r0, [sp]
|
|
ldr r1, [sp, #4]
|
|
add r0, r0, #2
|
|
mov r1, r1, lsr #8
|
|
bl m68k_reg_write8
|
|
ldmfd sp!,{r0,r1,lr}
|
|
add r0, r0, #3
|
|
b m68k_reg_write8
|
|
|
|
m_m68k_write32_regs_comm: @ Handle the 0x10-0x1f range
|
|
ldr r0, =(Pico+0x22200)
|
|
mov r3, #0xff
|
|
ldr r0, [r0]
|
|
orr r3, r3, r3, lsl #16
|
|
add r0, r0, #0x110000
|
|
and r12,r3, r1, ror #16 @ data is big-endian to be written as little, have to byteswap
|
|
and r1, r3, r1, ror #24
|
|
orr r1, r1, r12,lsl #8 @ end of byteswap
|
|
cmp r2, #0x1e
|
|
strh r1, [r2, r0]!
|
|
ldr r3, =s68k_poll_adclk
|
|
ldr r0, [r3]
|
|
movne r1, r1, lsr #16
|
|
strneh r1, [r2, #2]
|
|
cmp r0, #0x10
|
|
bxlt lr
|
|
ldr r0, =PicoCpuCS68k @ remove poll detected state for s68k
|
|
mov r1, #0
|
|
str r1, [r0, #0x58]
|
|
str r1, [r3]
|
|
bx lr
|
|
|
|
m_m68k_write32_misc:
|
|
bic r0, r0, #1
|
|
stmfd sp!,{r0,r1,lr}
|
|
mov r1, r1, lsr #16
|
|
bl OtherWrite16
|
|
ldmfd sp!,{r0,r1,lr}
|
|
add r0, r0, #2
|
|
b OtherWrite16
|
|
|
|
m_m68k_write32_regs_spec:
|
|
bic r0, r0, #1
|
|
stmfd sp!,{r0,r1,lr}
|
|
mov r1, r1, lsr #16
|
|
bl m_m68k_write16_regs
|
|
ldmfd sp!,{r0,r1,lr}
|
|
add r0, r0, #2
|
|
b m_m68k_write16_regs
|
|
|
|
|
|
m_m68k_write32_vdp:
|
|
tst r0, #0x70000
|
|
tsteq r0, #0x000e0
|
|
bxne lr @ invalid
|
|
and r2, r0, #0x18
|
|
cmp r2, #0x10
|
|
moveq r0, r1, lsr #16
|
|
beq SN76496Write @ which game is crazy enough to do that?
|
|
stmfd sp!,{r0,r1,lr}
|
|
mov r1, r1, lsr #16
|
|
bl PicoVideoWrite
|
|
ldmfd sp!,{r0,r1,lr}
|
|
add r0, r0, #2
|
|
b PicoVideoWrite
|
|
|
|
|
|
m_m68k_write32_ram:
|
|
ldr r2, =Pico
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #1
|
|
m_write32_gen
|
|
bx lr
|
|
|
|
.pool
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
.macro m_s68k_read8_ram map_addr
|
|
ldr r1, =(Pico+0x22200)
|
|
eor r0, r0, #1
|
|
ldr r1, [r1]
|
|
.if \map_addr
|
|
add r0, r0, #\map_addr @ map to our address
|
|
.endif
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_read8_wordram_2M_decode map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #2
|
|
ldr r2, [r2]
|
|
movs r0, r0, lsr #1 @ +4-6 <<16
|
|
add r2, r2, #\map_addr @ map to our address
|
|
ldrb r0, [r2, r0]
|
|
movcc r0, r0, lsr #4
|
|
andcs r0, r0, #0xf
|
|
bx lr
|
|
.endm
|
|
|
|
|
|
m_s68k_read8_prg: @ 0x000000 - 0x07ffff
|
|
m_s68k_read8_wordram_2M: @ 0x080000 - 0x0bffff
|
|
m_s68k_read8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000
|
|
m_s68k_read8_ram 0x020000
|
|
|
|
|
|
m_s68k_read8_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff
|
|
m_s68k_read8_wordram_2M_decode 0x080000 @ + ^ / 2
|
|
|
|
|
|
m_s68k_read8_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff
|
|
m_s68k_read8_wordram_2M_decode 0x0a0000 @ + ^ / 2
|
|
|
|
|
|
m_s68k_read8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :)
|
|
m_s68k_read8_ram 0
|
|
|
|
|
|
m_s68k_read8_backup: @ 0xfe0000 - 0xfe3fff (repeated?)
|
|
@ must not trash r3 and r12
|
|
ldr r1, =(Pico+0x22200)
|
|
mov r0, r0, lsr #1
|
|
ldr r1, [r1]
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #0x00e000
|
|
add r1, r1, #0x110000
|
|
add r1, r1, #0x000200
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_s68k_read8_pcm:
|
|
@ must not trash r3 and r12
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #0xff0000
|
|
@ bic r0, r0, #0x008000
|
|
ldr r1, [r1]
|
|
mov r2, #0x110000
|
|
orr r2, r2, #0x002200
|
|
cmp r0, #0x2000
|
|
bge m_s68k_read8_pcm_ram
|
|
cmp r0, #0x20
|
|
movlt r0, #0
|
|
bxlt lr
|
|
orr r2, r2, #(0x48+8) @ pcm.ch + addr_offset
|
|
add r1, r1, r2
|
|
and r2, r0, #0x1c
|
|
ldr r1, [r1, r2, lsl #2]
|
|
tst r0, #2
|
|
moveq r0, r1, lsr #PCM_STEP_SHIFT
|
|
movne r0, r1, lsr #(PCM_STEP_SHIFT+8)
|
|
and r0, r0, #0xff
|
|
bx lr
|
|
|
|
m_s68k_read8_pcm_ram:
|
|
orr r2, r2, #0x40
|
|
ldr r2, [r1, r2]
|
|
add r1, r1, #0x100000 @ pcm_ram
|
|
and r2, r2, #0x0f000000 @ bank
|
|
add r1, r1, r2, lsr #12
|
|
bic r0, r0, #0x00e000
|
|
mov r0, r0, lsr #1
|
|
ldrb r0, [r1, r0]
|
|
bx lr
|
|
|
|
|
|
m_s68k_read8_regs:
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #0x008000
|
|
tst r0, #0x7e00
|
|
movne r0, #0
|
|
bxne lr
|
|
sub r2, r0, #0x0e
|
|
cmp r2, #(0x30-0x0e)
|
|
blo m_s68k_read8_comm
|
|
sub r2, r0, #0x58
|
|
cmp r2, #0x10
|
|
ldrlo r2, =gfx_cd_read
|
|
ldrhs r2, =s68k_reg_read16
|
|
stmfd sp!,{r0,lr}
|
|
bic r0, r0, #1
|
|
mov lr, pc
|
|
bx r2
|
|
ldmfd sp!,{r1,lr}
|
|
tst r1, #1
|
|
moveq r0, r0, lsr #8
|
|
and r0, r0, #0xff
|
|
bx lr
|
|
|
|
m_s68k_read8_comm:
|
|
ldr r1, =(Pico+0x22200)
|
|
ldr r1, [r1]
|
|
add r1, r1, #0x110000
|
|
ldrb r1, [r1, r0]
|
|
b s68k_poll_detect
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
.macro m_s68k_read16_ram map_addr
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r1, [r1]
|
|
.if \map_addr
|
|
add r0, r0, #\map_addr @ map to our address
|
|
.endif
|
|
ldrh r0, [r1, r0]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_read16_wordram_2M_decode map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #2
|
|
ldr r2, [r2]
|
|
mov r0, r0, lsr #1 @ +4-6 <<16
|
|
add r2, r2, #\map_addr @ map to our address
|
|
ldrb r0, [r2, r0]
|
|
orr r0, r0, r0, lsl #4
|
|
bic r0, r0, #0xf0
|
|
bx lr
|
|
.endm
|
|
|
|
|
|
m_s68k_read16_prg: @ 0x000000 - 0x07ffff
|
|
m_s68k_read16_wordram_2M: @ 0x080000 - 0x0bffff
|
|
m_s68k_read16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000
|
|
m_s68k_read16_ram 0x020000
|
|
|
|
|
|
m_s68k_read16_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff
|
|
m_s68k_read16_wordram_2M_decode 0x080000
|
|
|
|
|
|
m_s68k_read16_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff
|
|
m_s68k_read16_wordram_2M_decode 0x0a0000
|
|
|
|
|
|
m_s68k_read16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :)
|
|
m_s68k_read16_ram 0
|
|
|
|
|
|
@ m_s68k_read16_backup: @ 0xfe0000 - 0xfe3fff (repeated?)
|
|
@ bram is not meant to be accessed by words, does any game do this?
|
|
.equiv m_s68k_read16_backup, m_s68k_read8_backup
|
|
|
|
|
|
@ m_s68k_read16_pcm:
|
|
@ pcm is on 8-bit bus, would this be same as byte access?
|
|
.equiv m_s68k_read16_pcm, m_s68k_read8_pcm
|
|
|
|
|
|
m_s68k_read16_regs:
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #0x008000
|
|
bic r0, r0, #0x000001
|
|
tst r0, #0x7e00
|
|
movne r0, #0
|
|
bxne lr
|
|
sub r2, r0, #0x58
|
|
cmp r2, #0x10
|
|
blo gfx_cd_read
|
|
cmp r0, #8
|
|
bne s68k_reg_read16
|
|
mov r0, #1
|
|
b Read_CDC_Host
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
.macro m_s68k_read32_ram map_addr
|
|
ldr r1, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r1, [r1]
|
|
.if \map_addr
|
|
add r0, r0, #\map_addr @ map to our address
|
|
.endif
|
|
m_read32_gen
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_read32_wordram_2M_decode map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #2
|
|
ldr r2, [r2]
|
|
mov r0, r0, lsr #1 @ +4-6 <<16
|
|
add r2, r2, #\map_addr @ map to our address
|
|
ldrb r1, [r2, r0]!
|
|
tst r0, #1
|
|
ldrneb r0, [r2, #-1]
|
|
ldreqb r0, [r2, #2]
|
|
orr r1, r1, r1, lsl #4
|
|
bic r1, r1, #0xf0
|
|
orr r0, r0, r0, lsl #4
|
|
bic r0, r0, #0xf0
|
|
orr r0, r0, r1, lsl #16
|
|
bx lr
|
|
.endm
|
|
|
|
|
|
m_s68k_read32_prg: @ 0x000000 - 0x07ffff
|
|
m_s68k_read32_wordram_2M: @ 0x080000 - 0x0bffff
|
|
m_s68k_read32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000
|
|
m_s68k_read32_ram 0x020000
|
|
|
|
|
|
m_s68k_read32_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff
|
|
m_s68k_read32_wordram_2M_decode 0x080000
|
|
|
|
|
|
m_s68k_read32_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff
|
|
m_s68k_read32_wordram_2M_decode 0x0a0000
|
|
|
|
|
|
m_s68k_read32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :)
|
|
m_s68k_read32_ram 0
|
|
|
|
|
|
m_s68k_read32_backup: @ 0xfe0000 - 0xfe3fff (repeated?)
|
|
@ bram is not meant to be accessed by words, does any game do this?
|
|
mov r12,lr
|
|
mov r3, r0
|
|
bl m_s68k_read8_backup @ must preserve r3 and r12
|
|
mov r1, r0
|
|
add r0, r3, #2
|
|
mov r3, r1
|
|
bl m_s68k_read8_backup
|
|
orr r0, r0, r3, lsl #16
|
|
bx r12
|
|
|
|
|
|
m_s68k_read32_pcm:
|
|
mov r12,lr
|
|
mov r3, r0
|
|
bl m_s68k_read8_pcm @ must preserve r3 and r12
|
|
mov r1, r0
|
|
add r0, r3, #2
|
|
mov r3, r1
|
|
bl m_s68k_read8_pcm
|
|
orr r0, r0, r3, lsl #16
|
|
bx r12
|
|
|
|
|
|
m_s68k_read32_regs:
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #0x008000
|
|
bic r0, r0, #0x000001
|
|
tst r0, #0x7e00
|
|
movne r0, #0
|
|
bxne lr
|
|
sub r2, r0, #0x58
|
|
cmp r2, #0x10
|
|
add r1, r0, #2
|
|
blo m_s68k_read32_regs_gfx
|
|
stmfd sp!,{r1,lr}
|
|
bl s68k_reg_read16
|
|
swp r0, r0, [sp]
|
|
bl s68k_reg_read16
|
|
ldmfd sp!,{r1,lr}
|
|
orr r0, r0, r1, lsl #16
|
|
bx lr
|
|
|
|
|
|
m_s68k_read32_regs_gfx:
|
|
stmfd sp!,{r1,lr}
|
|
bl gfx_cd_read
|
|
swp r0, r0, [sp]
|
|
bl gfx_cd_read
|
|
ldmfd sp!,{r1,lr}
|
|
orr r0, r0, r1, lsl #16
|
|
bx lr
|
|
|
|
.pool
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
.macro m_s68k_write8_ram map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #1
|
|
ldr r2, [r2]
|
|
.if \map_addr
|
|
add r0, r0, #\map_addr @ map to our address
|
|
.endif
|
|
strb r1, [r2, r0]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write8_2M_decode map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #2
|
|
ldr r2, [r2]
|
|
movs r0, r0, lsr #1 @ +4-6 <<16
|
|
add r2, r2, #\map_addr @ map to our address
|
|
.endm
|
|
|
|
.macro m_s68k_write8_2M_decode_m0 map_addr @ mode off
|
|
m_s68k_write8_2M_decode \map_addr
|
|
ldrb r0, [r2, r0]!
|
|
and r1, r1, #0x0f
|
|
movcc r1, r1, lsl #4
|
|
andcc r3, r0, #0x0f
|
|
andcs r3, r0, #0xf0
|
|
orr r3, r3, r1
|
|
cmp r0, r3 @ avoid writing if result is same
|
|
strneb r3, [r2]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write8_2M_decode_m1 map_addr @ mode underwrite
|
|
ands r1, r1, #0x0f
|
|
bxeq lr
|
|
m_s68k_write8_2M_decode \map_addr
|
|
ldrb r0, [r2, r0]!
|
|
movcc r1, r1, lsl #4
|
|
andcc r3, r0, #0x0f
|
|
andcs r3, r0, #0xf0
|
|
tst r3, r3
|
|
bxeq lr
|
|
orr r3, r3, r1
|
|
cmp r0, r3
|
|
strneb r3, [r2]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write8_2M_decode_m2 map_addr @ mode overwrite
|
|
ands r1, r1, #0x0f
|
|
bxeq lr
|
|
m_s68k_write8_2M_decode_m0 \map_addr @ same as in off mode
|
|
.endm
|
|
|
|
|
|
|
|
m_s68k_write8_prg: @ 0x000000 - 0x07ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #1
|
|
ldr r2, [r2]
|
|
add r3, r0, #0x020000 @ map to our address
|
|
add r12,r2, #0x110000
|
|
ldr r12,[r12]
|
|
and r12,r12,#0x00ff0000 @ wp
|
|
cmp r0, r12, lsr #8
|
|
strgeb r1, [r2, r3]
|
|
bx lr
|
|
|
|
|
|
m_s68k_write8_wordram_2M: @ 0x080000 - 0x0bffff
|
|
m_s68k_write8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000
|
|
m_s68k_write8_ram 0x020000
|
|
|
|
|
|
m_s68k_write8_2M_decode_b0_m0: @ 0x080000 - 0x0bffff
|
|
m_s68k_write8_2M_decode_m0 0x080000
|
|
|
|
m_s68k_write8_2M_decode_b0_m1:
|
|
m_s68k_write8_2M_decode_m1 0x080000
|
|
|
|
m_s68k_write8_2M_decode_b0_m2:
|
|
m_s68k_write8_2M_decode_m2 0x080000
|
|
|
|
m_s68k_write8_2M_decode_b1_m0:
|
|
m_s68k_write8_2M_decode_m0 0x0a0000
|
|
|
|
m_s68k_write8_2M_decode_b1_m1:
|
|
m_s68k_write8_2M_decode_m1 0x0a0000
|
|
|
|
m_s68k_write8_2M_decode_b1_m2:
|
|
m_s68k_write8_2M_decode_m2 0x0a0000
|
|
|
|
|
|
m_s68k_write8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :)
|
|
m_s68k_write8_ram 0
|
|
|
|
|
|
m_s68k_write8_backup: @ 0xfe0000 - 0xfe3fff (repeated?)
|
|
@ must not trash r3 and r12
|
|
ldr r2, =(Pico+0x22200)
|
|
mov r0, r0, lsr #1
|
|
ldr r2, [r2]
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #0x00e000
|
|
add r2, r2, #0x110000
|
|
add r2, r2, #0x000200
|
|
strb r1, [r2, r0]
|
|
ldr r1, =SRam
|
|
mov r0, #1
|
|
strb r0, [r1, #0x0e] @ SRam.changed = 1
|
|
bx lr
|
|
|
|
|
|
m_s68k_write8_pcm:
|
|
bic r0, r0, #0xff0000
|
|
cmp r0, #0x12
|
|
movlt r0, r0, lsr #1
|
|
blt pcm_write
|
|
|
|
cmp r0, #0x2000
|
|
bxlt lr
|
|
|
|
m_s68k_write8_pcm_ram:
|
|
ldr r3, =(Pico+0x22200)
|
|
bic r0, r0, #0x00e000
|
|
ldr r3, [r3]
|
|
mov r0, r0, lsr #1
|
|
add r2, r3, #0x110000
|
|
add r2, r2, #0x002200
|
|
add r2, r2, #0x000040
|
|
ldr r2, [r2]
|
|
add r3, r3, #0x100000 @ pcm_ram
|
|
and r2, r2, #0x0f000000 @ bank
|
|
add r3, r3, r2, lsr #12
|
|
strb r1, [r3, r0]
|
|
bx lr
|
|
|
|
|
|
m_s68k_write8_regs:
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #0x008000
|
|
tst r0, #0x7e00
|
|
movne r0, #0
|
|
bxne lr
|
|
sub r2, r0, #0x58
|
|
cmp r2, #0x10
|
|
bhs s68k_reg_write8
|
|
bic r0, r0, #1
|
|
orr r1, r1, r1, lsl #8
|
|
b gfx_cd_write16
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
.macro m_s68k_write16_ram map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r2, [r2]
|
|
.if \map_addr
|
|
add r0, r0, #\map_addr @ map to our address
|
|
.endif
|
|
strh r1, [r2, r0]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write16_2M_decode map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #2
|
|
ldr r2, [r2]
|
|
mov r0, r0, lsr #1 @ +4-6 <<16
|
|
add r2, r2, #\map_addr @ map to our address
|
|
.endm
|
|
|
|
.macro m_s68k_write16_2M_decode_m0 map_addr @ mode off
|
|
m_s68k_write16_2M_decode \map_addr
|
|
bic r1, r1, #0xf0
|
|
orr r1, r1, r1, lsr #4
|
|
strb r1, [r2, r0]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write16_2M_decode_m1 map_addr @ mode underwrite
|
|
bics r1, r1, #0xf000
|
|
bicnes r1, r1, #0x00f0
|
|
bxeq lr
|
|
orr r1, r1, r1, lsr #4
|
|
m_s68k_write16_2M_decode \map_addr
|
|
ldrb r0, [r2, r0]!
|
|
and r3, r1, #0x0f
|
|
and r1, r1, #0xf0
|
|
tst r0, #0x0f
|
|
orreq r0, r0, r3
|
|
tst r0, #0xf0
|
|
orreq r0, r0, r1
|
|
strb r0, [r2]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write16_2M_decode_m2 map_addr @ mode overwrite
|
|
bics r1, r1, #0xf000
|
|
bicnes r1, r1, #0x00f0
|
|
bxeq lr
|
|
orr r1, r1, r1, lsr #4
|
|
m_s68k_write16_2M_decode \map_addr
|
|
ldrb r0, [r2, r0]!
|
|
ands r3, r1, #0x0f
|
|
andne r0, r0, #0xf0
|
|
orrne r0, r0, r3
|
|
ands r1, r1, #0xf0
|
|
andne r0, r0, #0x0f
|
|
orrne r0, r0, r1
|
|
strb r0, [r2]
|
|
bx lr
|
|
.endm
|
|
|
|
|
|
|
|
m_s68k_write16_prg: @ 0x000000 - 0x07ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r2, [r2]
|
|
add r3, r0, #0x020000 @ map to our address
|
|
add r12,r2, #0x110000
|
|
ldr r12,[r12]
|
|
and r12,r12,#0x00ff0000 @ wp
|
|
cmp r0, r12, lsr #8
|
|
strgeh r1, [r2, r3]
|
|
bx lr
|
|
|
|
|
|
m_s68k_write16_wordram_2M: @ 0x080000 - 0x0bffff
|
|
m_s68k_write16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000
|
|
m_s68k_write16_ram 0x020000
|
|
|
|
|
|
m_s68k_write16_2M_decode_b0_m0: @ 0x080000 - 0x0bffff
|
|
m_s68k_write16_2M_decode_m0 0x080000
|
|
|
|
m_s68k_write16_2M_decode_b0_m1:
|
|
m_s68k_write16_2M_decode_m1 0x080000
|
|
|
|
m_s68k_write16_2M_decode_b0_m2:
|
|
m_s68k_write16_2M_decode_m2 0x080000
|
|
|
|
m_s68k_write16_2M_decode_b1_m0:
|
|
m_s68k_write16_2M_decode_m0 0x0a0000
|
|
|
|
m_s68k_write16_2M_decode_b1_m1:
|
|
m_s68k_write16_2M_decode_m1 0x0a0000
|
|
|
|
m_s68k_write16_2M_decode_b1_m2:
|
|
m_s68k_write16_2M_decode_m2 0x0a0000
|
|
|
|
|
|
m_s68k_write16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :)
|
|
m_s68k_write16_ram 0
|
|
|
|
|
|
@ m_s68k_write16_backup:
|
|
.equiv m_s68k_write16_backup, m_s68k_write8_backup
|
|
|
|
|
|
@ m_s68k_write16_pcm:
|
|
.equiv m_s68k_write16_pcm, m_s68k_write8_pcm
|
|
|
|
|
|
m_s68k_write16_regs:
|
|
bic r0, r0, #0xff0000
|
|
bic r0, r0, #0x008000
|
|
bic r0, r0, #1
|
|
tst r0, #0x7e00
|
|
movne r0, #0
|
|
bxne lr
|
|
cmp r0, #0x0e
|
|
beq m_s68k_write16_regs_spec
|
|
sub r2, r0, #0x58
|
|
cmp r2, #0x10
|
|
blo gfx_cd_write16
|
|
and r3, r1, #0xff
|
|
add r2, r0, #1
|
|
stmfd sp!,{r2,r3,lr}
|
|
mov r1, r1, lsr #8
|
|
bl s68k_reg_write8
|
|
ldmfd sp!,{r0,r1,lr}
|
|
b s68k_reg_write8
|
|
|
|
m_s68k_write16_regs_spec: @ special case
|
|
ldr r2, =(Pico+0x22200)
|
|
mov r0, #0x110000
|
|
ldr r2, [r2]
|
|
add r0, r0, #0x00000f
|
|
strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d;
|
|
bx lr
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
|
|
|
|
|
|
.macro m_s68k_write32_ram map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r2, [r2]
|
|
.if \map_addr
|
|
add r0, r0, #\map_addr @ map to our address
|
|
.endif
|
|
m_write32_gen
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write32_2M_decode map_addr
|
|
ldr r2, =(Pico+0x22200)
|
|
eor r0, r0, #2
|
|
ldr r2, [r2]
|
|
mov r0, r0, lsr #1 @ +4-6 <<16
|
|
add r2, r2, #\map_addr @ map to our address
|
|
.endm
|
|
|
|
.macro m_s68k_write32_2M_decode_m0 map_addr @ mode off
|
|
m_s68k_write32_2M_decode \map_addr
|
|
bic r1, r1, #0x000000f0
|
|
bic r1, r1, #0x00f00000
|
|
orr r1, r1, r1, lsr #4
|
|
mov r3, r1, lsr #16
|
|
strb r3, [r2, r0]!
|
|
tst r0, #1
|
|
strneb r1, [r2, #-1]
|
|
streqb r1, [r2, #3]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write32_2M_decode_m1 map_addr @ mode underwrite
|
|
bics r1, r1, #0x000000f0
|
|
bicnes r1, r1, #0x0000f000
|
|
bicnes r1, r1, #0x00f00000
|
|
bicnes r1, r1, #0xf0000000
|
|
bxeq lr
|
|
orr r1, r1, r1, lsr #4
|
|
m_s68k_write32_2M_decode \map_addr
|
|
ldrb r3, [r2, r0]!
|
|
tst r0, #1
|
|
ldrneb r0, [r2, #-1]
|
|
ldreqb r0, [r2, #3]
|
|
and r12,r1, #0x0000000f
|
|
orr r0, r0, r3, lsl #16
|
|
orrne r0, r0, #0x80000000 @ remember addr lsb bit
|
|
tst r0, #0x0000000f
|
|
orreq r0, r0, r12
|
|
tst r0, #0x000000f0
|
|
andeq r12,r1, #0x000000f0
|
|
orreq r0, r0, r12
|
|
tst r0, #0x000f0000
|
|
andeq r12,r1, #0x000f0000
|
|
orreq r0, r0, r12
|
|
tst r0, #0x00f00000
|
|
andeq r12,r1, #0x00f00000
|
|
orreq r0, r0, r12
|
|
tst r0, #0x80000000
|
|
strneb r0, [r2, #-1]
|
|
streqb r0, [r2, #3]
|
|
mov r0, r0, lsr #16
|
|
strb r0, [r2]
|
|
bx lr
|
|
.endm
|
|
|
|
.macro m_s68k_write32_2M_decode_m2 map_addr @ mode overwrite
|
|
bics r1, r1, #0x000000f0
|
|
bicnes r1, r1, #0x0000f000
|
|
bicnes r1, r1, #0x00f00000
|
|
bicnes r1, r1, #0xf0000000
|
|
bxeq lr
|
|
orr r1, r1, r1, lsr #4
|
|
m_s68k_write32_2M_decode \map_addr
|
|
ldrb r3, [r2, r0]!
|
|
tst r0, #1
|
|
ldrneb r0, [r2, #-1]
|
|
ldreqb r0, [r2, #3]
|
|
orrne r1, r1, #0x80000000 @ remember addr lsb bit
|
|
orr r0, r0, r3, lsl #16
|
|
tst r1, #0x0000000f
|
|
andeq r12,r0, #0x0000000f
|
|
orreq r1, r1, r12
|
|
tst r1, #0x000000f0
|
|
andeq r12,r0, #0x000000f0
|
|
orreq r1, r1, r12
|
|
tst r1, #0x000f0000
|
|
andeq r12,r0, #0x000f0000
|
|
orreq r1, r1, r12
|
|
tst r1, #0x00f00000
|
|
andeq r12,r0, #0x00f00000
|
|
orreq r1, r1, r12
|
|
cmp r0, r1
|
|
bxeq lr
|
|
tst r1, #0x80000000
|
|
strneb r1, [r2, #-1]
|
|
streqb r1, [r2, #3]
|
|
mov r1, r1, lsr #16
|
|
strb r1, [r2]
|
|
bx lr
|
|
.endm
|
|
|
|
|
|
|
|
m_s68k_write32_prg: @ 0x000000 - 0x07ffff
|
|
ldr r2, =(Pico+0x22200)
|
|
bic r0, r0, #1
|
|
ldr r2, [r2]
|
|
add r3, r0, #0x020000 @ map to our address
|
|
add r12,r2, #0x110000
|
|
ldr r12,[r12]
|
|
and r12,r12,#0x00ff0000 @ wp
|
|
cmp r0, r12, lsr #8
|
|
bxlt lr
|
|
mov r0, r1, lsr #16
|
|
strh r0, [r2, r3]!
|
|
strh r1, [r2, #2]
|
|
bx lr
|
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m_s68k_write32_wordram_2M: @ 0x080000 - 0x0bffff
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m_s68k_write32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000
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m_s68k_write32_ram 0x020000
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m_s68k_write32_2M_decode_b0_m0: @ 0x080000 - 0x0bffff
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m_s68k_write32_2M_decode_m0 0x080000
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m_s68k_write32_2M_decode_b0_m1:
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m_s68k_write32_2M_decode_m1 0x080000
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m_s68k_write32_2M_decode_b0_m2:
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m_s68k_write32_2M_decode_m2 0x080000
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m_s68k_write32_2M_decode_b1_m0:
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m_s68k_write32_2M_decode_m0 0x0a0000
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m_s68k_write32_2M_decode_b1_m1:
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m_s68k_write32_2M_decode_m1 0x0a0000
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m_s68k_write32_2M_decode_b1_m2:
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m_s68k_write32_2M_decode_m2 0x0a0000
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m_s68k_write32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :)
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m_s68k_write32_ram 0
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m_s68k_write32_backup:
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add r12,r0, #2
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mov r3, r1
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mov r1, r1, lsr #16
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stmfd sp!,{lr}
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bl m_s68k_write8_backup @ must preserve r3 and r12
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ldmfd sp!,{lr}
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mov r0, r12
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mov r1, r3
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b m_s68k_write8_backup
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m_s68k_write32_pcm:
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bic r0, r0, #0xff0000
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cmp r0, #0x12
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blt m_s68k_write32_pcm_reg
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cmp r0, #0x2000
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bxlt lr
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m_s68k_write32_pcm_ram:
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ldr r3, =(Pico+0x22200)
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bic r0, r0, #0x00e000
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ldr r3, [r3]
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mov r0, r0, lsr #1
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add r2, r3, #0x110000
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add r2, r2, #0x002200
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add r2, r2, #0x000040
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ldr r2, [r2]
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add r3, r3, #0x100000 @ pcm_ram
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and r2, r2, #0x0f000000 @ bank
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add r3, r3, r2, lsr #12
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mov r1, r1, ror #16
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strb r1, [r3, r0]!
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mov r1, r1, ror #16
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strb r1, [r3]
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bx lr
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m_s68k_write32_pcm_reg:
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mov r0, r0, lsr #1
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stmfd sp!,{r0,r1,lr}
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mov r1, r1, lsr #16
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bl pcm_write
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ldmfd sp!,{r0,r1,lr}
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add r0, r0, #1
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b pcm_write
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m_s68k_write32_regs:
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bic r0, r0, #0xff0000
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bic r0, r0, #0x008000
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bic r0, r0, #1
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tst r0, #0x7e00
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bxne lr
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sub r2, r0, #0x58
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cmp r2, #0x10
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blo m_s68k_write32_regs_gfx
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and r2, r0, #0x1fc
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cmp r2, #0x0c
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beq m_s68k_write32_regs_spec @ hits 0x0f
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and r2, r0, #0x1f0
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cmp r2, #0x20
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beq m_s68k_write32_regs_comm
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stmfd sp!,{r0,r1,lr}
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mov r1, r1, lsr #24
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bl s68k_reg_write8
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ldr r0, [sp]
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ldr r1, [sp, #4]
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add r0, r0, #1
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mov r1, r1, lsr #16
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bl s68k_reg_write8
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ldr r0, [sp]
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ldr r1, [sp, #4]
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add r0, r0, #2
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mov r1, r1, lsr #8
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bl s68k_reg_write8
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ldmfd sp!,{r0,r1,lr}
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add r0, r0, #3
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b s68k_reg_write8
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m_s68k_write32_regs_gfx:
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stmfd sp!,{r0,r1,lr}
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mov r1, r1, lsr #16
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bl gfx_cd_write16
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ldmfd sp!,{r0,r1,lr}
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add r0, r0, #2
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b gfx_cd_write16
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m_s68k_write32_regs_comm: @ Handle the 0x20-0x2f range
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ldr r2, =(Pico+0x22200)
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mov r3, #0xff
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ldr r2, [r2]
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orr r3, r3, r3, lsl #16
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add r2, r2, #0x110000
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and r12,r3, r1, ror #16 @ data is big-endian to be written as little, have to byteswap
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and r1, r3, r1, ror #24
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orr r1, r1, r12,lsl #8 @ end of byteswap
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cmp r0, #0x2e
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strh r1, [r0, r2]!
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movne r1, r1, lsr #16
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strneh r1, [r0, #2]
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bx lr
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m_s68k_write32_regs_spec:
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stmfd sp!,{r0,r1,lr}
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mov r1, r1, lsr #16
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bl m_s68k_write16_regs
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ldmfd sp!,{r0,r1,lr}
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add r0, r0, #2
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b m_s68k_write16_regs
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