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
788 lines
19 KiB
ArmAsm
788 lines
19 KiB
ArmAsm
# vim:filetype=mips
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# memory handlers with banking support for SSF II - The New Challengers
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# mostly based on Gens code
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# (c) Copyright 2007, Grazvydas "notaz" Ignotas
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# All Rights Reserved
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.set noreorder
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.set noat
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.text
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.align 4
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# default jump tables
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m_read8_def_table:
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.long m_read8_rom0 # 0x000000 - 0x07FFFF
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.long m_read8_rom1 # 0x080000 - 0x0FFFFF
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.long m_read8_rom2 # 0x100000 - 0x17FFFF
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.long m_read8_rom3 # 0x180000 - 0x1FFFFF
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.long m_read8_rom4 # 0x200000 - 0x27FFFF
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.long m_read8_rom5 # 0x280000 - 0x2FFFFF
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.long m_read8_rom6 # 0x300000 - 0x37FFFF
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.long m_read8_rom7 # 0x380000 - 0x3FFFFF
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.long m_read8_rom8 # 0x400000 - 0x47FFFF - for all those large ROM hacks
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.long m_read8_rom9 # 0x480000 - 0x4FFFFF
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.long m_read8_romA # 0x500000 - 0x57FFFF
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.long m_read8_romB # 0x580000 - 0x5FFFFF
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.long m_read8_romC # 0x600000 - 0x67FFFF
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.long m_read8_romD # 0x680000 - 0x6FFFFF
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.long m_read8_romE # 0x700000 - 0x77FFFF
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.long m_read8_romF # 0x780000 - 0x7FFFFF
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.long m_read8_rom10 # 0x800000 - 0x87FFFF
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.long m_read8_rom11 # 0x880000 - 0x8FFFFF
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.long m_read8_rom12 # 0x900000 - 0x97FFFF
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.long m_read8_rom13 # 0x980000 - 0x9FFFFF
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.long m_read8_misc # 0xA00000 - 0xA7FFFF
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.long m_read_null # 0xA80000 - 0xAFFFFF
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.long m_read_null # 0xB00000 - 0xB7FFFF
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.long m_read_null # 0xB80000 - 0xBFFFFF
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.long m_read8_vdp # 0xC00000 - 0xC7FFFF
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.long m_read8_vdp # 0xC80000 - 0xCFFFFF
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.long m_read8_vdp # 0xD00000 - 0xD7FFFF
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.long m_read8_vdp # 0xD80000 - 0xDFFFFF
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.long m_read8_ram # 0xE00000 - 0xE7FFFF
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.long m_read8_ram # 0xE80000 - 0xEFFFFF
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.long m_read8_ram # 0xF00000 - 0xF7FFFF
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.long m_read8_ram # 0xF80000 - 0xFFFFFF
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m_read16_def_table:
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.long m_read16_rom0 # 0x000000 - 0x07FFFF
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.long m_read16_rom1 # 0x080000 - 0x0FFFFF
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.long m_read16_rom2 # 0x100000 - 0x17FFFF
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.long m_read16_rom3 # 0x180000 - 0x1FFFFF
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.long m_read16_rom4 # 0x200000 - 0x27FFFF
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.long m_read16_rom5 # 0x280000 - 0x2FFFFF
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.long m_read16_rom6 # 0x300000 - 0x37FFFF
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.long m_read16_rom7 # 0x380000 - 0x3FFFFF
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.long m_read16_rom8 # 0x400000 - 0x47FFFF
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.long m_read16_rom9 # 0x480000 - 0x4FFFFF
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.long m_read16_romA # 0x500000 - 0x57FFFF
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.long m_read16_romB # 0x580000 - 0x5FFFFF
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.long m_read16_romC # 0x600000 - 0x67FFFF
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.long m_read16_romD # 0x680000 - 0x6FFFFF
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.long m_read16_romE # 0x700000 - 0x77FFFF
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.long m_read16_romF # 0x780000 - 0x7FFFFF
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.long m_read16_rom10 # 0x800000 - 0x87FFFF
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.long m_read16_rom11 # 0x880000 - 0x8FFFFF
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.long m_read16_rom12 # 0x900000 - 0x97FFFF
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.long m_read16_rom13 # 0x980000 - 0x9FFFFF
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.long m_read16_misc # 0xA00000 - 0xA7FFFF
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.long m_read_null # 0xA80000 - 0xAFFFFF
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.long m_read_null # 0xB00000 - 0xB7FFFF
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.long m_read_null # 0xB80000 - 0xBFFFFF
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.long m_read16_vdp # 0xC00000 - 0xC7FFFF
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.long m_read16_vdp # 0xC80000 - 0xCFFFFF
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.long m_read16_vdp # 0xD00000 - 0xD7FFFF
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.long m_read16_vdp # 0xD80000 - 0xDFFFFF
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.long m_read16_ram # 0xE00000 - 0xE7FFFF
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.long m_read16_ram # 0xE80000 - 0xEFFFFF
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.long m_read16_ram # 0xF00000 - 0xF7FFFF
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.long m_read16_ram # 0xF80000 - 0xFFFFFF
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m_read32_def_table:
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.long m_read32_rom0 # 0x000000 - 0x07FFFF
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.long m_read32_rom1 # 0x080000 - 0x0FFFFF
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.long m_read32_rom2 # 0x100000 - 0x17FFFF
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.long m_read32_rom3 # 0x180000 - 0x1FFFFF
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.long m_read32_rom4 # 0x200000 - 0x27FFFF
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.long m_read32_rom5 # 0x280000 - 0x2FFFFF
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.long m_read32_rom6 # 0x300000 - 0x37FFFF
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.long m_read32_rom7 # 0x380000 - 0x3FFFFF
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.long m_read32_rom8 # 0x400000 - 0x47FFFF
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.long m_read32_rom9 # 0x480000 - 0x4FFFFF
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.long m_read32_romA # 0x500000 - 0x57FFFF
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.long m_read32_romB # 0x580000 - 0x5FFFFF
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.long m_read32_romC # 0x600000 - 0x67FFFF
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.long m_read32_romD # 0x680000 - 0x6FFFFF
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.long m_read32_romE # 0x700000 - 0x77FFFF
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.long m_read32_romF # 0x780000 - 0x7FFFFF
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.long m_read32_rom10 # 0x800000 - 0x87FFFF
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.long m_read32_rom11 # 0x880000 - 0x8FFFFF
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.long m_read32_rom12 # 0x900000 - 0x97FFFF
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.long m_read32_rom13 # 0x980000 - 0x9FFFFF
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.long m_read32_misc # 0xA00000 - 0xA7FFFF
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.long m_read_null # 0xA80000 - 0xAFFFFF
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.long m_read_null # 0xB00000 - 0xB7FFFF
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.long m_read_null # 0xB80000 - 0xBFFFFF
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.long m_read32_vdp # 0xC00000 - 0xC7FFFF
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.long m_read32_vdp # 0xC80000 - 0xCFFFFF
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.long m_read32_vdp # 0xD00000 - 0xD7FFFF
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.long m_read32_vdp # 0xD80000 - 0xDFFFFF
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.long m_read32_ram # 0xE00000 - 0xE7FFFF
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.long m_read32_ram # 0xE80000 - 0xEFFFFF
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.long m_read32_ram # 0xF00000 - 0xF7FFFF
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.long m_read32_ram # 0xF80000 - 0xFFFFFF
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# #############################################################################
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.bss
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.align 4
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# used tables
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m_read8_table:
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.skip 32*4
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m_read16_table:
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.skip 32*4
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m_read32_table:
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.skip 32*4
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# #############################################################################
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.text
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.align 4
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.global PicoMemReset
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.global PicoRead8
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.global PicoRead16
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.global PicoRead32
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.global PicoWriteRomHW_SSF2
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.global m_read8_def_table
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.global m_read8_table
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.macro PicoMemResetCopyDef dst_table src_table
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lui $t0, %hi(\dst_table)
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addiu $t0, %lo(\dst_table)
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lui $t1, %hi(\src_table)
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addiu $t1, %lo(\src_table)
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li $t2, 32
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1:
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lw $t3, 0($t1)
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sw $t3, 0($t0)
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addiu $t2, -1
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addiu $t1, 4
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bnez $t2, 1b
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addiu $t0, 4
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.endm
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# $t4 = 4
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.macro PicoMemResetRomArea dst_table ar_label
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lui $t0, %hi(\dst_table)
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addiu $t0, %lo(\dst_table)
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lui $t1, %hi(\ar_label)
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addiu $t1, %lo(\ar_label)
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li $t2, 20
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1:
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beq $t2, $v1, 2f
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addiu $t2, -1
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sll $t3, $t2, 2
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beq $t2, $t4, 1b # do not touch the SRAM area
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addu $t3, $t0
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j 1b
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sw $t1, 0($t3)
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2:
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.endm
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PicoMemReset:
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lui $v1, %hi(Pico+0x22204)
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lw $v1, %lo(Pico+0x22204)($v1) # romsize
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lui $t0, 8
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addu $v1, $t0
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addiu $v1, -1
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srl $v1, 19
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PicoMemResetCopyDef m_read8_table m_read8_def_table
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PicoMemResetCopyDef m_read16_table m_read16_def_table
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PicoMemResetCopyDef m_read32_table m_read32_def_table
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# update memhandlers according to ROM size
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li $t4, 4
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PicoMemResetRomArea m_read8_table m_read8_above_rom
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PicoMemResetRomArea m_read16_table m_read16_above_rom
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PicoMemResetRomArea m_read32_table m_read32_above_rom
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jr $ra
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nop
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# #############################################################################
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.macro PicoReadJump table
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lui $t0, %hi(\table)
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srl $t1, $a0, 19
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ins $t0, $t1, 2, 5
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lw $t0, %lo(\table)($t0)
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ins $a0, $0, 24, 8
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jr $t0
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nop
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.endm
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PicoRead8: # u32 a
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PicoReadJump m_read8_table
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PicoRead16: # u32 a
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PicoReadJump m_read16_table
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PicoRead32: # u32 a
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PicoReadJump m_read32_table
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# #############################################################################
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m_read_null:
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jr $ra
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li $v0, 0
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m_read_neg1:
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jr $ra
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addiu $v0, $0, 0xffff
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# loads &Pico.rom to $t3
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.macro m_read_rom_try_sram is200000 size
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lui $t2, %hi(SRam)
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addiu $t2, %lo(SRam)
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lui $t3, %hi(Pico+0x22200)
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lw $t1, 8($t2) # SRam.end
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.if \is200000
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ins $a0, $0, 19, 13
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lui $t4, 0x20
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or $a0, $t4
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.endif
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subu $t4, $a0, $t1
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bgtz $t4, 1f
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addiu $t3, %lo(Pico+0x22200)
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lw $t1, 4($t2) # SRam.start
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subu $t4, $t1, $a0
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bgtz $t4, 1f
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nop
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lb $t1, 0x11($t3) # Pico.m.sram_reg
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andi $t4, $t1, 5
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beqz $t4, 1f
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nop
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.if \size == 8
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j SRAMRead
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nop
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.elseif \size == 16
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sw $ra, -4($sp)
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jal SRAMRead16
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addiu $sp, -4
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lw $ra, 0($sp)
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jr $ra
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addiu $sp, 4
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.else
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addiu $sp, -8
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sw $ra, 0($sp)
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sw $a0, 4($sp)
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jal SRAMRead16
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nop
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lw $a0, 4($sp)
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sw $v0, 4($sp)
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jal SRAMRead16
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addiu $a0, 2
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lw $v1, 4($sp)
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lw $ra, 0($sp)
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addiu $sp, 8
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jr $ra
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ins $v0, $v1, 16, 16
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.endif
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# m_read_nosram:
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1:
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.endm
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.macro m_read8_rom sect
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lui $t0, %hi(Pico+0x22200)
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lw $t0, %lo(Pico+0x22200)($t0) # rom
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xori $a0, 1
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ins $a0, $0, 19, 13
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.if \sect
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lui $t1, 8*\sect
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addu $a0, $t1
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.endif
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addu $t0, $a0
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jr $ra
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lb $v0, 0($t0)
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.endm
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m_read8_rom0: # 0x000000 - 0x07ffff
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m_read8_rom 0
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m_read8_rom1: # 0x080000 - 0x0fffff
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m_read8_rom 1
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m_read8_rom2: # 0x100000 - 0x17ffff
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m_read8_rom 2
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m_read8_rom3: # 0x180000 - 0x1fffff
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m_read8_rom 3
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m_read8_rom4: # 0x200000 - 0x27ffff, SRAM area
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m_read_rom_try_sram 1 8
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lw $t1, 4($t3) # romsize
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subu $t4, $t1, $a0
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blez $t4, m_read_null
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lw $t1, 0($t3) # rom
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xori $a0, 1
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addu $t1, $a0
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jr $ra
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lb $v0, 0($t1)
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m_read8_rom5: # 0x280000 - 0x2fffff
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m_read8_rom 5
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m_read8_rom6: # 0x300000 - 0x37ffff
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m_read8_rom 6
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m_read8_rom7: # 0x380000 - 0x3fffff
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m_read8_rom 7
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m_read8_rom8: # 0x400000 - 0x47ffff
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m_read8_rom 8
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m_read8_rom9: # 0x480000 - 0x4fffff
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m_read8_rom 9
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m_read8_romA: # 0x500000 - 0x57ffff
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m_read8_rom 0xA
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m_read8_romB: # 0x580000 - 0x5fffff
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m_read8_rom 0xB
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m_read8_romC: # 0x600000 - 0x67ffff
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m_read8_rom 0xC
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m_read8_romD: # 0x680000 - 0x6fffff
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m_read8_rom 0xD
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m_read8_romE: # 0x700000 - 0x77ffff
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m_read8_rom 0xE
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m_read8_romF: # 0x780000 - 0x7fffff
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m_read8_rom 0xF
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m_read8_rom10: # 0x800000 - 0x87ffff
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m_read8_rom 0x10
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m_read8_rom11: # 0x880000 - 0x8fffff
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m_read8_rom 0x11
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m_read8_rom12: # 0x900000 - 0x97ffff
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m_read8_rom 0x12
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m_read8_rom13: # 0x980000 - 0x9fffff
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m_read8_rom 0x13
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m_read8_misc:
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srl $t0, $a0, 5
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sll $t0, $t0, 5
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lui $t1, 0xa1
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bne $t0, $t1, m_read8_misc2
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andi $t0, $a0, 0x1e
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m_read8_misc_io:
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beqz $t0, m_read8_misc_hwreg
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sub $t1, $t0, 4
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bgtz $t1, m_read8_misc_ioports
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nop
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slti $a0, $t0, 4
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xori $a0, 1
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j PadRead
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nop
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m_read8_misc_hwreg:
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lui $v0, %hi(Pico+0x2220f)
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jr $ra
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lb $v0, %lo(Pico+0x2220f)($v0)
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m_read8_misc_ioports:
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lui $v0, %hi(Pico+0x22000)
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ins $v0, $t0, 0, 5
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jr $ra
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lb $v0, %lo(Pico+0x22000)($v0)
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m_read8_misc2:
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lui $t0, 0xa1
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ori $t0, 0x1100
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bne $a0, $t0, m_read8_misc3
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srl $t0, $a0, 16
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j z80ReadBusReq
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m_read8_misc3:
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addiu $t0, 0xff60 # expecting 0xa0 to get 0
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bnez $t0, m_read8_misc4
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# z80 area
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andi $t0, $a0, 0x4000
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bnez $t0, m_read8_z80_misc
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andi $t0, $a0, 0x6000
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j z80Read8 # z80 RAM
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m_read8_z80_misc:
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addiu $t0, 0xc000 # expecting 0x4000 to get 0
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bnez $t0, m_read_neg1 # invalid
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nop
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j ym2612_read_local_68k
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nop
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m_read8_fake_ym2612:
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lb $v0, %lo(Pico+0x22208)($t0) # Pico.m.rotate
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addiu $t1, $v0, 1
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jr $ra
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sb $t1, %lo(Pico+0x22208)($t0)
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# delay slot friendly
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.macro m_read8_call16 funcname is_func_ptr=0
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.if \is_func_ptr
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lui $t1, %hi(\funcname)
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lw $t1, %lo(\funcname)($t1)
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.endif
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andi $t0, $a0, 1
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beqz $t0, 1f
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li $a1, 8 # not always needed, but shouln't cause problems
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.if \is_func_ptr
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jr $t1
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.else
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j \funcname # odd address
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.endif
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nop
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1:
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addiu $sp, -4
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sw $ra, 0($sp)
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.if \is_func_ptr
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jalr $t1
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.else
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jal \funcname
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.endif
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xori $a0, 1
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lw $ra, 0($sp)
|
|
addiu $sp, 4
|
|
jr $ra
|
|
srl $v0, 8
|
|
.endm
|
|
|
|
m_read8_misc4:
|
|
# if everything else fails, use generic handler
|
|
m_read8_call16 OtherRead16
|
|
|
|
m_read8_vdp:
|
|
ext $t0, $a0, 16, 3
|
|
andi $t1, $a0, 0xe0
|
|
or $t0, $t1
|
|
bnez $t0, m_read_null # invalid address
|
|
nop
|
|
j PicoVideoRead8
|
|
nop
|
|
|
|
m_read8_ram:
|
|
lui $t0, %hi(Pico)
|
|
ins $t0, $a0, 0, 16
|
|
xori $t0, 1
|
|
jr $ra
|
|
lb $v0, %lo(Pico)($t0)
|
|
|
|
m_read8_above_rom:
|
|
# might still be SRam (Micro Machines, HardBall '95)
|
|
m_read_rom_try_sram 0 8
|
|
m_read8_call16 PicoRead16Hook 1
|
|
|
|
# #############################################################################
|
|
|
|
.macro m_read16_rom sect
|
|
lui $t0, %hi(Pico+0x22200)
|
|
lw $t0, %lo(Pico+0x22200)($t0) # rom
|
|
ins $a0, $0, 0, 1
|
|
ins $a0, $0, 19, 13
|
|
.if \sect
|
|
lui $t1, 8*\sect
|
|
addu $a0, $t1
|
|
.endif
|
|
addu $t0, $a0
|
|
jr $ra
|
|
lh $v0, 0($t0)
|
|
.endm
|
|
|
|
|
|
m_read16_rom0: # 0x000000 - 0x07ffff
|
|
m_read16_rom 0
|
|
|
|
m_read16_rom1: # 0x080000 - 0x0fffff
|
|
m_read16_rom 1
|
|
|
|
m_read16_rom2: # 0x100000 - 0x17ffff
|
|
m_read16_rom 2
|
|
|
|
m_read16_rom3: # 0x180000 - 0x1fffff
|
|
m_read16_rom 3
|
|
|
|
m_read16_rom4: # 0x200000 - 0x27ffff, SRAM area
|
|
m_read_rom_try_sram 1 16
|
|
lw $t1, 4($t3) # romsize
|
|
subu $t4, $t1, $a0
|
|
blez $t4, m_read_null
|
|
lw $t1, 0($t3) # rom
|
|
ins $a0, $0, 0, 1
|
|
addu $t1, $a0
|
|
jr $ra
|
|
lh $v0, 0($t1)
|
|
|
|
m_read16_rom5: # 0x280000 - 0x2fffff
|
|
m_read16_rom 5
|
|
|
|
m_read16_rom6: # 0x300000 - 0x37ffff
|
|
m_read16_rom 6
|
|
|
|
m_read16_rom7: # 0x380000 - 0x3fffff
|
|
m_read16_rom 7
|
|
|
|
m_read16_rom8: # 0x400000 - 0x47ffff
|
|
m_read16_rom 8
|
|
|
|
m_read16_rom9: # 0x480000 - 0x4fffff
|
|
m_read16_rom 9
|
|
|
|
m_read16_romA: # 0x500000 - 0x57ffff
|
|
m_read16_rom 0xA
|
|
|
|
m_read16_romB: # 0x580000 - 0x5fffff
|
|
m_read16_rom 0xB
|
|
|
|
m_read16_romC: # 0x600000 - 0x67ffff
|
|
m_read16_rom 0xC
|
|
|
|
m_read16_romD: # 0x680000 - 0x6fffff
|
|
m_read16_rom 0xD
|
|
|
|
m_read16_romE: # 0x700000 - 0x77ffff
|
|
m_read16_rom 0xE
|
|
|
|
m_read16_romF: # 0x780000 - 0x7fffff
|
|
m_read16_rom 0xF
|
|
|
|
m_read16_rom10: # 0x800000 - 0x87ffff
|
|
m_read16_rom 0x10
|
|
|
|
m_read16_rom11: # 0x880000 - 0x8fffff
|
|
m_read16_rom 0x11
|
|
|
|
m_read16_rom12: # 0x900000 - 0x97ffff
|
|
m_read16_rom 0x12
|
|
|
|
m_read16_rom13: # 0x980000 - 0x9fffff
|
|
m_read16_rom 0x13
|
|
|
|
m_read16_misc:
|
|
ins $a0, $0, 0, 1
|
|
j OtherRead16
|
|
li $a1, 16
|
|
|
|
m_read16_vdp:
|
|
ext $t0, $a0, 16, 3
|
|
andi $t1, $a0, 0xe0
|
|
or $t0, $t1
|
|
bnez $t0, m_read_null # invalid address
|
|
ins $a0, $0, 0, 1
|
|
j PicoVideoRead
|
|
nop
|
|
|
|
m_read16_ram:
|
|
lui $t0, %hi(Pico)
|
|
ins $a0, $0, 0, 1
|
|
ins $t0, $a0, 0, 16
|
|
jr $ra
|
|
lh $v0, %lo(Pico)($t0)
|
|
|
|
m_read16_above_rom:
|
|
# might still be SRam
|
|
m_read_rom_try_sram 0 16
|
|
lui $t1, %hi(PicoRead16Hook)
|
|
lw $t1, %lo(PicoRead16Hook)($t1)
|
|
jr $t1
|
|
ins $a0, $0, 0, 1
|
|
|
|
# #############################################################################
|
|
|
|
.macro m_read32_rom sect
|
|
lui $t0, %hi(Pico+0x22200)
|
|
lw $t0, %lo(Pico+0x22200)($t0) # rom
|
|
ins $a0, $0, 0, 1
|
|
ins $a0, $0, 19, 13
|
|
.if \sect
|
|
lui $t1, 8*\sect
|
|
addu $a0, $t1
|
|
.endif
|
|
addu $t0, $a0
|
|
lh $v1, 0($t0)
|
|
lh $v0, 2($t0)
|
|
jr $ra
|
|
ins $v0, $v1, 16, 16
|
|
.endm
|
|
|
|
|
|
m_read32_rom0: # 0x000000 - 0x07ffff
|
|
m_read32_rom 0
|
|
|
|
m_read32_rom1: # 0x080000 - 0x0fffff
|
|
m_read32_rom 1
|
|
|
|
m_read32_rom2: # 0x100000 - 0x17ffff
|
|
m_read32_rom 2
|
|
|
|
m_read32_rom3: # 0x180000 - 0x1fffff
|
|
m_read32_rom 3
|
|
|
|
m_read32_rom4: # 0x200000 - 0x27ffff, SRAM area
|
|
m_read_rom_try_sram 1 32
|
|
lw $t1, 4($t3) # romsize
|
|
subu $t4, $t1, $a0
|
|
blez $t4, m_read_null
|
|
lw $t1, 0($t3) # rom
|
|
ins $a0, $0, 0, 1
|
|
addu $t1, $a0
|
|
lh $v1, 0($t1)
|
|
lh $v0, 2($t1)
|
|
jr $ra
|
|
ins $v0, $v1, 16, 16
|
|
|
|
m_read32_rom5: # 0x280000 - 0x2fffff
|
|
m_read32_rom 5
|
|
|
|
m_read32_rom6: # 0x300000 - 0x37ffff
|
|
m_read32_rom 6
|
|
|
|
m_read32_rom7: # 0x380000 - 0x3fffff
|
|
m_read32_rom 7
|
|
|
|
m_read32_rom8: # 0x400000 - 0x47ffff
|
|
m_read32_rom 8
|
|
|
|
m_read32_rom9: # 0x480000 - 0x4fffff
|
|
m_read32_rom 9
|
|
|
|
m_read32_romA: # 0x500000 - 0x57ffff
|
|
m_read32_rom 0xA
|
|
|
|
m_read32_romB: # 0x580000 - 0x5fffff
|
|
m_read32_rom 0xB
|
|
|
|
m_read32_romC: # 0x600000 - 0x67ffff
|
|
m_read32_rom 0xC
|
|
|
|
m_read32_romD: # 0x680000 - 0x6fffff
|
|
m_read32_rom 0xD
|
|
|
|
m_read32_romE: # 0x700000 - 0x77ffff
|
|
m_read32_rom 0xE
|
|
|
|
m_read32_romF: # 0x780000 - 0x7fffff
|
|
m_read32_rom 0xF
|
|
|
|
m_read32_rom10: # 0x800000 - 0x87ffff
|
|
m_read32_rom 0x10
|
|
|
|
m_read32_rom11: # 0x880000 - 0x8fffff
|
|
m_read32_rom 0x11
|
|
|
|
m_read32_rom12: # 0x900000 - 0x97ffff
|
|
m_read32_rom 0x12
|
|
|
|
m_read32_rom13: # 0x980000 - 0x9fffff
|
|
m_read32_rom 0x13
|
|
|
|
.macro m_read32_call16 func need_a1=0
|
|
addiu $sp, -8
|
|
sw $ra, 0($sp)
|
|
sw $s0, 4($sp)
|
|
.if \need_a1
|
|
li $a1, 16
|
|
.endif
|
|
jal \func
|
|
move $s0, $a0
|
|
|
|
addu $a0, $s0, 2
|
|
.if \need_a1
|
|
li $a1, 16
|
|
.endif
|
|
jal \func
|
|
move $s0, $v0
|
|
|
|
ins $v0, $s0, 16, 16
|
|
lw $ra, 0($sp)
|
|
lw $s0, 4($sp)
|
|
jr $ra
|
|
addiu $sp, 8
|
|
.endm
|
|
|
|
m_read32_misc:
|
|
ins $a0, $0, 0, 1
|
|
m_read32_call16 OtherRead16, 1
|
|
|
|
m_read32_vdp:
|
|
ext $t0, $a0, 16, 3
|
|
andi $t1, $a0, 0xe0
|
|
or $t0, $t1
|
|
bnez $t0, m_read_null # invalid address
|
|
ins $a0, $0, 0, 1
|
|
m_read32_call16 PicoVideoRead
|
|
|
|
m_read32_ram:
|
|
lui $t0, %hi(Pico)
|
|
ins $a0, $0, 0, 1
|
|
ins $t0, $a0, 0, 16
|
|
lh $v1, %lo(Pico)($t0)
|
|
lh $v0, %lo(Pico+2)($t0)
|
|
jr $ra
|
|
ins $v0, $v1, 16, 16
|
|
|
|
m_read32_above_rom:
|
|
# might still be SRam
|
|
m_read_rom_try_sram 0 32
|
|
ins $a0, $0, 0, 1
|
|
lui $t1, %hi(PicoRead16Hook)
|
|
lw $t1, %lo(PicoRead16Hook)($t1)
|
|
addiu $sp, -4*3
|
|
sw $ra, 0($sp)
|
|
sw $s0, 4($sp)
|
|
sw $t1, 8($sp)
|
|
jalr $t1
|
|
move $s0, $a0
|
|
|
|
lw $t1, 8($sp)
|
|
addu $a0, $s0, 2
|
|
jalr $t1
|
|
move $s0, $v0
|
|
|
|
ins $v0, $s0, 16, 16
|
|
lw $ra, 0($sp)
|
|
lw $s0, 4($sp)
|
|
jr $ra
|
|
addiu $sp, 4*3
|
|
|
|
# #############################################################################
|
|
|
|
.macro PicoWriteRomHW_SSF2_ls def_table table
|
|
lui $t3, %hi(\def_table)
|
|
ins $t3, $a1, 2, 5
|
|
lw $t0, %lo(\def_table)($t3)
|
|
lui $t2, %hi(\table)
|
|
ins $t2, $a0, 2, 3
|
|
sw $t0, %lo(\table)($t2)
|
|
.endm
|
|
|
|
PicoWriteRomHW_SSF2: # u32 a, u32 d
|
|
ext $a0, $a0, 1, 3
|
|
bnez $a0, pwr_banking
|
|
|
|
# sram register
|
|
lui $t0, %hi(Pico+0x22211)
|
|
lb $t1, %lo(Pico+0x22211)($t0) # Pico.m.sram_reg
|
|
ins $t1, $a1, 0, 2
|
|
jr $ra
|
|
sb $t1, %lo(Pico+0x22211)($t0)
|
|
|
|
pwr_banking:
|
|
andi $a1, 0x1f
|
|
|
|
PicoWriteRomHW_SSF2_ls m_read8_def_table m_read8_table
|
|
PicoWriteRomHW_SSF2_ls m_read16_def_table m_read16_table
|
|
PicoWriteRomHW_SSF2_ls m_read32_def_table m_read32_table
|
|
|
|
jr $ra
|
|
nop
|
|
|