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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@576 be3aeb3a-fb24-0410-a615-afba39da0efa
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
// basic, incomplete SSP160x (SSP1601?) interpreter
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// (c) Copyright 2008, Grazvydas "notaz" Ignotas
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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// register names
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enum {
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SSP_GR0, SSP_X, SSP_Y, SSP_A,
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SSP_ST, SSP_STACK, SSP_PC, SSP_P,
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SSP_PM0, SSP_PM1, SSP_PM2, SSP_XST,
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SSP_PM4, SSP_gr13, SSP_PMC, SSP_AL
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};
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typedef union
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{
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unsigned int v;
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struct {
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unsigned short l;
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unsigned short h;
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};
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} ssp_reg_t;
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typedef struct
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{
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union {
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unsigned short RAM[256*2]; // 000 2 internal RAM banks
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struct {
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unsigned short RAM0[256];
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unsigned short RAM1[256];
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};
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};
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ssp_reg_t gr[16]; // 400 general registers
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union {
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unsigned char r[8]; // 440 BANK pointers
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struct {
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unsigned char r0[4];
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unsigned char r1[4];
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};
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};
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unsigned short stack[6]; // 448
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unsigned int pmac_read[6]; // 454 read modes/addrs for PM0-PM5
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unsigned int pmac_write[6]; // 46c write ...
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//
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#define SSP_PMC_HAVE_ADDR 0x0001 // address written to PMAC, waiting for mode
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#define SSP_PMC_SET 0x0002 // PMAC is set
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#define SSP_WAIT_PM0 0x2000 // bit1 in PM0
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#define SSP_WAIT_30FE06 0x4000 // ssp tight loops on 30FE06 to become non-zero
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#define SSP_WAIT_30FE08 0x8000 // same for 30FE06
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#define SSP_WAIT_MASK 0xe000
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unsigned int emu_status; // 484
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/* used by recompiler only: */
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struct {
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unsigned int ptr_rom; // 488
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unsigned int ptr_iram_rom; // 48c
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unsigned int ptr_dram; // 490
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unsigned int iram_dirty; // 494
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unsigned int iram_context; // 498
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unsigned int ptr_btable; // 49c
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unsigned int ptr_btable_iram; // 4a0
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unsigned int tmp0; // 4a4
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unsigned int tmp1; // 4a8
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unsigned int tmp2; // 4ac
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} drc;
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} ssp1601_t;
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void ssp1601_reset(ssp1601_t *ssp);
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void ssp1601_run(int cycles);
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