mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
eaa10a6eb8
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@781 be3aeb3a-fb24-0410-a615-afba39da0efa
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
#include <string.h>
|
|
|
|
// MAME types
|
|
typedef signed char INT8;
|
|
typedef signed short INT16;
|
|
typedef signed int INT32;
|
|
typedef unsigned int UINT32;
|
|
typedef unsigned short UINT16;
|
|
typedef unsigned char UINT8;
|
|
|
|
// pico memhandlers
|
|
unsigned int pico32x_read8(unsigned int a);
|
|
unsigned int pico32x_read16(unsigned int a);
|
|
unsigned int pico32x_read32(unsigned int a);
|
|
void pico32x_write8(unsigned int a, unsigned int d);
|
|
void pico32x_write16(unsigned int a, unsigned int d);
|
|
void pico32x_write32(unsigned int a, unsigned int d);
|
|
|
|
#define RB pico32x_read8
|
|
#define RW pico32x_read16
|
|
#define RL pico32x_read32
|
|
#define WB pico32x_write8
|
|
#define WW pico32x_write16
|
|
#define WL pico32x_write32
|
|
|
|
// some stuff from sh2comn.h
|
|
#define T 0x00000001
|
|
#define S 0x00000002
|
|
#define I 0x000000f0
|
|
#define Q 0x00000100
|
|
#define M 0x00000200
|
|
|
|
#define AM 0xc7ffffff
|
|
|
|
#define FLAGS (M|Q|I|S|T)
|
|
|
|
#define Rn ((opcode>>8)&15)
|
|
#define Rm ((opcode>>4)&15)
|
|
|
|
#include "sh2.c"
|
|
|
|
void sh2_reset(SH2 *sh2)
|
|
{
|
|
int save_is_slave;
|
|
// cpu_irq_callback save_irqcallback;
|
|
|
|
// save_irqcallback = sh2->irq_callback;
|
|
save_is_slave = sh2->is_slave;
|
|
|
|
memset(sh2, 0, sizeof(SH2));
|
|
|
|
sh2->is_slave = save_is_slave;
|
|
// sh2->irq_callback = save_irqcallback;
|
|
|
|
sh2->pc = RL(0);
|
|
sh2->r[15] = RL(4);
|
|
sh2->sr = I;
|
|
|
|
sh2->internal_irq_level = -1;
|
|
}
|
|
|
|
/* Execute cycles - returns number of cycles actually run */
|
|
int sh2_execute(SH2 *sh2_, int cycles)
|
|
{
|
|
sh2 = sh2_;
|
|
sh2_icount = cycles;
|
|
|
|
do
|
|
{
|
|
UINT32 opcode;
|
|
|
|
opcode = RW(sh2->pc);
|
|
|
|
sh2->delay = 0;
|
|
sh2->pc += 2;
|
|
sh2->ppc = sh2->pc;
|
|
|
|
switch (opcode & ( 15 << 12))
|
|
{
|
|
case 0<<12: op0000(opcode); break;
|
|
case 1<<12: op0001(opcode); break;
|
|
case 2<<12: op0010(opcode); break;
|
|
case 3<<12: op0011(opcode); break;
|
|
case 4<<12: op0100(opcode); break;
|
|
case 5<<12: op0101(opcode); break;
|
|
case 6<<12: op0110(opcode); break;
|
|
case 7<<12: op0111(opcode); break;
|
|
case 8<<12: op1000(opcode); break;
|
|
case 9<<12: op1001(opcode); break;
|
|
case 10<<12: op1010(opcode); break;
|
|
case 11<<12: op1011(opcode); break;
|
|
case 12<<12: op1100(opcode); break;
|
|
case 13<<12: op1101(opcode); break;
|
|
case 14<<12: op1110(opcode); break;
|
|
default: op1111(opcode); break;
|
|
}
|
|
|
|
if (sh2->test_irq && !sh2->delay)
|
|
{
|
|
// CHECK_PENDING_IRQ("mame_sh2_execute");
|
|
sh2->test_irq = 0;
|
|
}
|
|
sh2_icount--;
|
|
}
|
|
while (sh2_icount > 0);
|
|
|
|
return cycles - sh2_icount;
|
|
}
|
|
|
|
void sh2_init(SH2 *sh2)
|
|
{
|
|
memset(sh2, 0, sizeof(*sh2));
|
|
}
|
|
|
|
|