--- /dev/null
+#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
+}
notaz.gp2x.de / picodrive.git / blobdiff