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gensis svp

This commit is contained in:
alyosha-tas 2017-04-16 16:12:41 -04:00 committed by GitHub
parent 13ca76f3f8
commit ba403f4d25
2 changed files with 80 additions and 50 deletions
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127
genplus-gx32/core/cart_hw/svp/svp.c
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@ -1,49 +1,82 @@
/* /*
basic, incomplete SSP160x (SSP1601?) interpreter basic, incomplete SSP160x (SSP1601?) interpreter
with SVP memory controller emu with SVP memory controller emu
(c) Copyright 2008, Grazvydas "notaz" Ignotas
(c) Copyright 2008, Grazvydas "notaz" Ignotas Free for non-commercial use.
Free for non-commercial use. For commercial use, separate licencing terms must be obtained.
Modified for Genesis Plus GX (Eke-Eke): added BIG ENDIAN support, fixed addr/code inversion
For commercial use, separate licencing terms must be obtained. */
Modified for Genesis Plus GX (Eke-Eke): added BIG ENDIAN support, fixed addr/code inversion #include "shared.h"
*/
svp_t *svp;
#include "shared.h"
static void svp_write_dram(uint32 address, uint32 data)
svp_t *svp = NULL; {
*(uint16 *)(svp->dram + (address & 0x1fffe)) = data;
void svp_init(void) if (data)
{ {
svp = (void *) ((char *)cart.rom + 0x200000); if (address == 0x30fe06) svp->ssp1601.emu_status &= ~SSP_WAIT_30FE06;
memset(svp, 0, sizeof(*svp)); else if (address == 0x30fe08) svp->ssp1601.emu_status &= ~SSP_WAIT_30FE08;
} }
}
void svp_reset(void)
{ static uint32 svp_read_cell_1(uint32 address)
memcpy(svp->iram_rom + 0x800, cart.rom + 0x800, 0x20000 - 0x800); {
ssp1601_reset(&svp->ssp1601); address = (address & 0xe002) | ((address & 0x7c) << 6) | ((address & 0x1f80) >> 5);
} return *(uint16 *)(svp->dram + address);
}
void svp_write_dram(uint32 address, uint32 data)
{ static uint32 svp_read_cell_2(uint32 address)
*(uint16 *)(svp->dram + (address & 0x1fffe)) = data; {
if ((address == 0x30fe06) && data) svp->ssp1601.emu_status &= ~SSP_WAIT_30FE06; address = (address & 0xf002) | ((address & 0x3c) << 6) | ((address & 0xfc0) >> 4);
if ((address == 0x30fe08) && data) svp->ssp1601.emu_status &= ~SSP_WAIT_30FE08; return *(uint16 *)(svp->dram + address);
} }
uint32 svp_read_cell_1(uint32 address) static uint32 svp_read_cell_byte(uint32 address)
{ {
address >>= 1; uint16 data = m68k.memory_map[address >> 16].read16(address);
address = (address & 0x7001) | ((address & 0x3e) << 6) | ((address & 0xfc0) >> 5);
return *(uint16 *)(svp->dram + (address & 0x1fffe)); if (address & 0x01)
} {
return (data & 0xff);
uint32 svp_read_cell_2(uint32 address) }
{
address >>= 1; return (data >> 8);
address = (address & 0x7801) | ((address & 0x1e) << 6) | ((address & 0x7e0) >> 4); }
return *(uint16 *)(svp->dram + (address & 0x1fffe));
void svp_init(void)
{
svp = (void *)((char *)cart.rom + 0x200000);
memset(svp, 0, sizeof(*svp));
m68k.memory_map[0x30].base = svp->dram;
m68k.memory_map[0x30].read8 = NULL;
m68k.memory_map[0x30].read16 = NULL;
m68k.memory_map[0x30].write8 = NULL;
m68k.memory_map[0x30].write16 = svp_write_dram;
zbank_memory_map[0x30].read = NULL;
zbank_memory_map[0x30].write = NULL;
m68k.memory_map[0x31].base = svp->dram + 0x10000;
m68k.memory_map[0x31].read8 = NULL;
m68k.memory_map[0x31].read16 = NULL;
m68k.memory_map[0x31].write8 = NULL;
m68k.memory_map[0x31].write16 = NULL;
zbank_memory_map[0x31].read = NULL;
zbank_memory_map[0x31].write = NULL;
m68k.memory_map[0x39].read8 = svp_read_cell_byte;
m68k.memory_map[0x39].read16 = svp_read_cell_1;
zbank_memory_map[0x39].read = svp_read_cell_byte;
m68k.memory_map[0x3a].read8 = svp_read_cell_byte;
m68k.memory_map[0x3a].read16 = svp_read_cell_2;
zbank_memory_map[0x3a].read = svp_read_cell_byte;
}
void svp_reset(void)
{
memcpy(svp->iram_rom + 0x800, cart.rom + 0x800, 0x20000 - 0x800);
ssp1601_reset(&svp->ssp1601);
} }

3
genplus-gx32/core/cart_hw/svp/svp.h
View File

@ -26,8 +26,5 @@ extern svp_t *svp;
extern void svp_init(void); extern void svp_init(void);
extern void svp_reset(void); extern void svp_reset(void);
extern void svp_write_dram(uint32 address, uint32 data);
extern uint32 svp_read_cell_1(uint32 address);
extern uint32 svp_read_cell_2(uint32 address);
#endif #endif