32x: new SH2 memory handling, hopefully faster

[picodrive.git] / cpu / sh2 / sh2.c

diff --git a/cpu/sh2/sh2.c b/cpu/sh2/sh2.c
index 8ba5673..cd07bef 100644 (file)
--- a/cpu/sh2/sh2.c
+++ b/cpu/sh2/sh2.c
@@ -25,27 +25,27 @@ void sh2_finish(SH2 *sh2)
 
 void sh2_reset(SH2 *sh2)
 {
-       sh2->pc = p32x_sh2_read32(0, sh2->is_slave);
-       sh2->r[15] = p32x_sh2_read32(4, sh2->is_slave);
+       sh2->pc = p32x_sh2_read32(0, sh2);
+       sh2->r[15] = p32x_sh2_read32(4, sh2);
        sh2->sr = I;
        sh2->vbr = 0;
        sh2->pending_int_irq = 0;
 }
 
-static void sh2_do_irq(SH2 *sh2, int level, int vector)
+void sh2_do_irq(SH2 *sh2, int level, int vector)
 {
        sh2->irq_callback(sh2->is_slave, level);
 
        sh2->r[15] -= 4;
-       p32x_sh2_write32(sh2->r[15], sh2->sr, sh2->is_slave);   /* push SR onto stack */
+       p32x_sh2_write32(sh2->r[15], sh2->sr, sh2);     /* push SR onto stack */
        sh2->r[15] -= 4;
-       p32x_sh2_write32(sh2->r[15], sh2->pc, sh2->is_slave);   /* push PC onto stack */
+       p32x_sh2_write32(sh2->r[15], sh2->pc, sh2);     /* push PC onto stack */
 
        /* set I flags in SR */
        sh2->sr = (sh2->sr & ~I) | (level << 4);
 
        /* fetch PC */
-       sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2->is_slave);
+       sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
 
        /* 13 cycles at best */
        sh2->cycles_done += 13;
@@ -55,20 +55,23 @@ static void sh2_do_irq(SH2 *sh2, int level, int vector)
 void sh2_irl_irq(SH2 *sh2, int level)
 {
        sh2->pending_irl = level;
-       if (level <= ((sh2->sr >> 4) & 0x0f))
-               return;
+       if (level > sh2->pending_int_irq)
+               sh2->pending_level = level;
+       else
+               sh2->pending_level = sh2->pending_int_irq;
 
-       sh2_do_irq(sh2, level, 64 + level/2);
+       sh2->test_irq = 1;
 }
 
 void sh2_internal_irq(SH2 *sh2, int level, int vector)
 {
+       // FIXME: multiple internal irqs not handled..
+       // assuming internal irqs never clear until accepted
        sh2->pending_int_irq = level;
        sh2->pending_int_vector = vector;
-       if (level <= ((sh2->sr >> 4) & 0x0f))
-               return;
+       if (level > sh2->pending_level)
+               sh2->pending_level = level;
 
-       sh2_do_irq(sh2, level, vector);
-       sh2->pending_int_irq = 0; // auto-clear
+       sh2->test_irq = 1;
 }