mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
refactoring z80 if code for sms preparation
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@752 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz
parent
4010330cc0
commit
c8d1e9b662
10 changed files with 354 additions and 375 deletions
212
pico/z80if.c
Normal file
212
pico/z80if.c
Normal file
|
|
@ -0,0 +1,212 @@
|
|||
#include "pico_int.h"
|
||||
#include "sound/sn76496.h"
|
||||
|
||||
#define Z80_MEM_SHIFT 13
|
||||
|
||||
unsigned long z80_read_map [0x10000 >> Z80_MEM_SHIFT];
|
||||
unsigned long z80_write_map[0x10000 >> Z80_MEM_SHIFT];
|
||||
|
||||
void MEMH_FUNC z80_map_set(unsigned long *map, int start_addr, int end_addr,
|
||||
void *func_or_mh, int is_func)
|
||||
{
|
||||
unsigned long addr = (unsigned long)func_or_mh;
|
||||
int mask = (1 << Z80_MEM_SHIFT) - 1;
|
||||
int i;
|
||||
|
||||
if ((start_addr & mask) != 0 || (end_addr & mask) != mask)
|
||||
elprintf(EL_STATUS|EL_ANOMALY, "z80_map_set: tried to map bad range: %04x-%04x",
|
||||
start_addr, end_addr);
|
||||
|
||||
if (addr & 1) {
|
||||
elprintf(EL_STATUS|EL_ANOMALY, "z80_map_set: ptr is not aligned: %08lx", addr);
|
||||
return;
|
||||
}
|
||||
|
||||
for (i = start_addr >> Z80_MEM_SHIFT; i <= end_addr >> Z80_MEM_SHIFT; i++)
|
||||
if (is_func)
|
||||
map[i] = (addr >> 1) | (1 << (sizeof(addr) * 8 - 1));
|
||||
else
|
||||
map[i] = (addr - (i << Z80_MEM_SHIFT)) >> 1;
|
||||
}
|
||||
|
||||
#ifdef _USE_MZ80
|
||||
|
||||
// memhandlers for mz80 core
|
||||
unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
|
||||
void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
|
||||
|
||||
// structures for mz80 core
|
||||
static struct MemoryReadByte mz80_mem_read[]=
|
||||
{
|
||||
{0x0000,0xffff,mz80_read},
|
||||
{(UINT32) -1,(UINT32) -1,NULL}
|
||||
};
|
||||
static struct MemoryWriteByte mz80_mem_write[]=
|
||||
{
|
||||
{0x0000,0xffff,mz80_write},
|
||||
{(UINT32) -1,(UINT32) -1,NULL}
|
||||
};
|
||||
static struct z80PortRead mz80_io_read[] ={
|
||||
{(UINT16) -1,(UINT16) -1,NULL}
|
||||
};
|
||||
static struct z80PortWrite mz80_io_write[]={
|
||||
{(UINT16) -1,(UINT16) -1,NULL}
|
||||
};
|
||||
|
||||
int mz80_run(int cycles)
|
||||
{
|
||||
int ticks_pre = mz80GetElapsedTicks(0);
|
||||
mz80exec(cycles);
|
||||
return mz80GetElapsedTicks(0) - ticks_pre;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#ifdef _USE_DRZ80
|
||||
|
||||
struct DrZ80 drZ80;
|
||||
|
||||
static unsigned int DrZ80_rebasePC(unsigned short a)
|
||||
{
|
||||
drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
|
||||
return drZ80.Z80PC_BASE + a;
|
||||
}
|
||||
|
||||
static unsigned int DrZ80_rebaseSP(unsigned short a)
|
||||
{
|
||||
drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
|
||||
return drZ80.Z80SP_BASE + a;
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
PICO_INTERNAL void z80_init(void)
|
||||
{
|
||||
#ifdef _USE_MZ80
|
||||
struct mz80context z80;
|
||||
|
||||
// z80
|
||||
mz80init();
|
||||
// Modify the default context
|
||||
mz80GetContext(&z80);
|
||||
|
||||
// point mz80 stuff
|
||||
z80.z80Base=Pico.zram;
|
||||
z80.z80MemRead=mz80_mem_read;
|
||||
z80.z80MemWrite=mz80_mem_write;
|
||||
z80.z80IoRead=mz80_io_read;
|
||||
z80.z80IoWrite=mz80_io_write;
|
||||
|
||||
mz80SetContext(&z80);
|
||||
#endif
|
||||
#ifdef _USE_DRZ80
|
||||
memset(&drZ80, 0, sizeof(drZ80));
|
||||
drZ80.z80_rebasePC=DrZ80_rebasePC;
|
||||
drZ80.z80_rebaseSP=DrZ80_rebaseSP;
|
||||
drZ80.z80_read8 =(void *)z80_read_map;
|
||||
drZ80.z80_read16 =NULL;
|
||||
drZ80.z80_write8 =(void *)z80_write_map;
|
||||
drZ80.z80_write16 =NULL;
|
||||
drZ80.z80_irq_callback=NULL;
|
||||
#endif
|
||||
#ifdef _USE_CZ80
|
||||
memset(&CZ80, 0, sizeof(CZ80));
|
||||
Cz80_Init(&CZ80);
|
||||
Cz80_Set_ReadB(&CZ80, NULL); // unused (hacked in)
|
||||
Cz80_Set_WriteB(&CZ80, NULL);
|
||||
#endif
|
||||
}
|
||||
|
||||
PICO_INTERNAL void z80_reset(void)
|
||||
{
|
||||
#ifdef _USE_MZ80
|
||||
mz80reset();
|
||||
#endif
|
||||
#ifdef _USE_DRZ80
|
||||
memset(&drZ80, 0, 0x54);
|
||||
drZ80.Z80F = (1<<2); // set ZFlag
|
||||
drZ80.Z80F2 = (1<<2); // set ZFlag
|
||||
drZ80.Z80IX = 0xFFFF << 16;
|
||||
drZ80.Z80IY = 0xFFFF << 16;
|
||||
drZ80.Z80IM = 0; // 1?
|
||||
drZ80.z80irqvector = 0xff0000; // RST 38h
|
||||
drZ80.Z80PC = drZ80.z80_rebasePC(0);
|
||||
drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
|
||||
#endif
|
||||
#ifdef _USE_CZ80
|
||||
Cz80_Reset(&CZ80);
|
||||
Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
|
||||
Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
|
||||
Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
|
||||
#endif
|
||||
Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
|
||||
}
|
||||
|
||||
PICO_INTERNAL void z80_pack(unsigned char *data)
|
||||
{
|
||||
#if defined(_USE_MZ80)
|
||||
struct mz80context mz80;
|
||||
*(int *)data = 0x00005A6D; // "mZ"
|
||||
mz80GetContext(&mz80);
|
||||
memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
|
||||
#elif defined(_USE_DRZ80)
|
||||
*(int *)data = 0x015A7244; // "DrZ" v1
|
||||
drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
|
||||
drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
|
||||
memcpy(data+4, &drZ80, 0x54);
|
||||
#elif defined(_USE_CZ80)
|
||||
*(int *)data = 0x00007a43; // "Cz"
|
||||
*(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
|
||||
memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
|
||||
#endif
|
||||
}
|
||||
|
||||
PICO_INTERNAL void z80_unpack(unsigned char *data)
|
||||
{
|
||||
#if defined(_USE_MZ80)
|
||||
if (*(int *)data == 0x00005A6D) { // "mZ" save?
|
||||
struct mz80context mz80;
|
||||
mz80GetContext(&mz80);
|
||||
memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
|
||||
mz80SetContext(&mz80);
|
||||
} else {
|
||||
z80_reset();
|
||||
z80_int();
|
||||
}
|
||||
#elif defined(_USE_DRZ80)
|
||||
if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
|
||||
memcpy(&drZ80, data+4, 0x54);
|
||||
// update bases
|
||||
drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
|
||||
drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
|
||||
} else {
|
||||
z80_reset();
|
||||
drZ80.Z80IM = 1;
|
||||
z80_int(); // try to goto int handler, maybe we won't execute trash there?
|
||||
}
|
||||
#elif defined(_USE_CZ80)
|
||||
if (*(int *)data == 0x00007a43) { // "Cz" save?
|
||||
memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
|
||||
Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
|
||||
} else {
|
||||
z80_reset();
|
||||
z80_int();
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
PICO_INTERNAL void z80_exit(void)
|
||||
{
|
||||
#if defined(_USE_MZ80)
|
||||
mz80shutdown();
|
||||
#endif
|
||||
}
|
||||
|
||||
PICO_INTERNAL void z80_debug(char *dstr)
|
||||
{
|
||||
#if defined(_USE_DRZ80)
|
||||
sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
|
||||
#elif defined(_USE_CZ80)
|
||||
sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
|
||||
#endif
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue