32x: start reworking sheduling

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

diff --git a/cpu/sh2/sh2.c b/cpu/sh2/sh2.c
index bda1c93..937f8e4 100644 (file)
--- a/cpu/sh2/sh2.c
+++ b/cpu/sh2/sh2.c
@@ -1,60 +1,120 @@
+/*
+ * PicoDrive
+ * (C) notaz, 2009,2010
+ *
+ * This work is licensed under the terms of MAME license.
+ * See COPYING file in the top-level directory.
+ */
 #include <string.h>
+#include <stddef.h>
+
 #include "sh2.h"
+#include "../debug.h"
+#include "compiler.h"
 
 #define I 0xf0
 
-void sh2_init(SH2 *sh2, int is_slave)
+SH2 *sh2; // active sh2
+
+int sh2_init(SH2 *sh2, int is_slave)
 {
-       memset(sh2, 0, sizeof(*sh2));
+       int ret = 0;
+
+       memset(sh2, 0, offsetof(SH2, mult_m68k_to_sh2));
        sh2->is_slave = is_slave;
+       pdb_register_cpu(sh2, PDBCT_SH2, is_slave ? "ssh2" : "msh2");
+#ifdef DRC_SH2
+       ret = sh2_drc_init(sh2);
+#endif
+       return ret;
+}
+
+void sh2_finish(SH2 *sh2)
+{
+#ifdef DRC_SH2
+       sh2_drc_finish(sh2);
+#endif
 }
 
 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;
+       sh2->m68krcycles_done += C_SH2_TO_M68K(*sh2, 13);
 //     sh2->icount -= 13;
 }
 
-void sh2_irl_irq(SH2 *sh2, int level)
+void sh2_irl_irq(SH2 *sh2, int level, int nested_call)
 {
        sh2->pending_irl = level;
-       if (level <= ((sh2->sr >> 4) & 0x0f))
-               return;
+       if (level < sh2->pending_int_irq)
+               level = sh2->pending_int_irq;
+       sh2->pending_level = level;
 
-       sh2_do_irq(sh2, level, 64 + level/2);
+       if (!nested_call) {
+               // not in memhandler, so handle this now (recompiler friendly)
+               // do this to avoid missing irqs that other SH2 might clear
+               if (level > ((sh2->sr >> 4) & 0x0f)) {
+                       int vector = sh2->irq_callback(sh2, level);
+                       sh2_do_irq(sh2, level, vector);
+               }
+       }
+       else
+               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->test_irq = 1;
+}
+
+#define SH2_REG_SIZE (offsetof(SH2, macl) + sizeof(sh2->macl))
+
+void sh2_pack(const SH2 *sh2, unsigned char *buff)
+{
+       unsigned int *p;
+
+       memcpy(buff, sh2, SH2_REG_SIZE);
+       p = (void *)(buff + SH2_REG_SIZE);
+
+       p[0] = sh2->pending_int_irq;
+       p[1] = sh2->pending_int_vector;
+}
+
+void sh2_unpack(SH2 *sh2, const unsigned char *buff)
+{
+       unsigned int *p;
+
+       memcpy(sh2, buff, SH2_REG_SIZE);
+       p = (void *)(buff + SH2_REG_SIZE);
 
-       sh2_do_irq(sh2, level, vector);
-       sh2->pending_int_irq = 0; // auto-clear
+       sh2->pending_int_irq = p[0];
+       sh2->pending_int_vector = p[1];
 }