+/*
+ * 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
+SH2 *sh2; // active sh2
+
int sh2_init(SH2 *sh2, int is_slave)
{
int ret = 0;
memset(sh2, 0, sizeof(*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
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->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;
+ p[2] = sh2->cycles_aim;
+ p[3] = sh2->cycles_done;
+}
+
+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];
+ sh2->cycles_aim = p[2];
+ sh2->cycles_done = p[3];
}