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improve z80 reset handling (drZ80 at least)

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@888 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2010-09-06 21:02:48 +00:00
parent 7090b78416
commit cf82669f50
1 changed files with 10 additions and 8 deletions
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18
pico/z80if.c
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@ -71,26 +71,28 @@ void z80_init(void)
void z80_reset(void) void z80_reset(void)
{ {
#ifdef _USE_DRZ80 #ifdef _USE_DRZ80
// FIXME: reset is not correct drZ80.Z80I = 0;
memset(&drZ80, 0, 0x54); drZ80.Z80IM = 0;
drZ80.Z80IF = 0;
drZ80.z80irqvector = 0xff0000; // RST 38h
drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0] << 1;
// others not changed, undefined on cold boot
/*
drZ80.Z80F = (1<<2); // set ZFlag drZ80.Z80F = (1<<2); // set ZFlag
drZ80.Z80F2 = (1<<2); // set ZFlag drZ80.Z80F2 = (1<<2); // set ZFlag
drZ80.Z80IX = 0xFFFF << 16; drZ80.Z80IX = 0xFFFF << 16;
drZ80.Z80IY = 0xFFFF << 16; drZ80.Z80IY = 0xFFFF << 16;
drZ80.Z80I = 0; */
drZ80.Z80IM = 0; // 1?
drZ80.z80irqvector = 0xff0000; // RST 38h
drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0] << 1;
// drZ80 is locked in single bank // drZ80 is locked in single bank
drz80_sp_base = (PicoAHW & PAHW_SMS) ? 0xc000 : 0x0000; drz80_sp_base = (PicoAHW & PAHW_SMS) ? 0xc000 : 0x0000;
drZ80.Z80SP_BASE = z80_read_map[drz80_sp_base >> Z80_MEM_SHIFT] << 1; drZ80.Z80SP_BASE = z80_read_map[drz80_sp_base >> Z80_MEM_SHIFT] << 1;
if (PicoAHW & PAHW_SMS) if (PicoAHW & PAHW_SMS)
drZ80.Z80SP = drZ80.Z80SP_BASE + 0xdff0; // simulate BIOS drZ80.Z80SP = drZ80.Z80SP_BASE + 0xdff0; // simulate BIOS
// XXX: since we use direct SP pointer, it might make sense to force it to RAM,
// but we'll rely on built-in stack protection for now
#endif #endif
#ifdef _USE_CZ80 #ifdef _USE_CZ80
Cz80_Reset(&CZ80); Cz80_Reset(&CZ80);
Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
if (PicoAHW & PAHW_SMS) if (PicoAHW & PAHW_SMS)
Cz80_Set_Reg(&CZ80, CZ80_SP, 0xdff0); Cz80_Set_Reg(&CZ80, CZ80_SP, 0xdff0);
#endif #endif