RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-06 07:38:05 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

32x: watchdog for Star Wars, SCI IRQs for X-men (also needs idle loop hacks)

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@799 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-10-01 20:53:36 +00:00
parent 236990cf77
commit 1d7a28a723
8 changed files with 167 additions and 54 deletions
Download patch file Download diff file Expand all files Collapse all files

5
cpu/sh2mame/sh2.h
View file

@ -44,7 +44,9 @@ typedef struct
UINT32 delay;
UINT32 test_irq;
int pending_irq;
int pending_irl;
int pending_int_irq; // internal irq
int pending_int_vector;
void (*irq_callback)(int id, int level);
int is_slave;
@ -58,5 +60,6 @@ void sh2_init(SH2 *sh2, int is_slave);
void sh2_reset(SH2 *sh2);
int sh2_execute(SH2 *sh2_, int cycles);
void sh2_irl_irq(SH2 *sh2, int level);
void sh2_internal_irq(SH2 *sh2, int level, int vector);
#endif /* __SH2_H__ */

59
cpu/sh2mame/sh2pico.c
View file

@ -57,6 +57,25 @@ void sh2_reset(SH2 *sh2)
sh2->sr = I;
}
static void sh2_do_irq(SH2 *sh2, int level, int vector)
{
sh2->irq_callback(sh2->is_slave, level);
sh2->r[15] -= 4;
WL(sh2->r[15], sh2->sr); /* push SR onto stack */
sh2->r[15] -= 4;
WL(sh2->r[15], sh2->pc); /* push PC onto stack */
/* set I flags in SR */
sh2->sr = (sh2->sr & ~I) | (level << 4);
/* fetch PC */
sh2->pc = RL(sh2->vbr + vector * 4);
/* 13 cycles at best */
sh2_icount -= 13;
}
/* Execute cycles - returns number of cycles actually run */
int sh2_execute(SH2 *sh2_, int cycles)
{
@ -105,8 +124,10 @@ int sh2_execute(SH2 *sh2_, int cycles)
if (sh2->test_irq && !sh2->delay)
{
if (sh2->pending_irq)
sh2_irl_irq(sh2, sh2->pending_irq);
if (sh2->pending_irl > sh2->pending_int_irq)
sh2_irl_irq(sh2, sh2->pending_irl);
else
sh2_internal_irq(sh2, sh2->pending_int_irq, sh2->pending_int_vector);
sh2->test_irq = 0;
}
sh2_icount--;
@ -124,29 +145,21 @@ void sh2_init(SH2 *sh2, int is_slave)
void sh2_irl_irq(SH2 *sh2, int level)
{
int vector;
sh2->pending_irq = level;
sh2->pending_irl = level;
if (level <= ((sh2->sr >> 4) & 0x0f))
/* masked */
return;
sh2->irq_callback(sh2->is_slave, level);
vector = 64 + level/2;
sh2->r[15] -= 4;
WL(sh2->r[15], sh2->sr); /* push SR onto stack */
sh2->r[15] -= 4;
WL(sh2->r[15], sh2->pc); /* push PC onto stack */
/* set I flags in SR */
sh2->sr = (sh2->sr & ~I) | (level << 4);
/* fetch PC */
sh2->pc = RL(sh2->vbr + vector * 4);
/* 13 cycles at best */
sh2_icount -= 13;
sh2_do_irq(sh2, level, 64 + level/2);
}
void sh2_internal_irq(SH2 *sh2, int level, int vector)
{
sh2->pending_int_irq = level;
sh2->pending_int_vector = vector;
if (level <= ((sh2->sr >> 4) & 0x0f))
return;
sh2_do_irq(sh2, level, vector);
sh2->pending_int_irq = 0; // auto-clear
}