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- #include <string.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
- 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);
- sh2->r[15] = p32x_sh2_read32(4, sh2);
- sh2->sr = I;
- sh2->vbr = 0;
- sh2->pending_int_irq = 0;
- }
- void sh2_do_irq(SH2 *sh2, int level, int vector)
- {
- sh2->r[15] -= 4;
- 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); /* 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);
- /* 13 cycles at best */
- sh2->cycles_done += 13;
- // sh2->icount -= 13;
- }
- void sh2_irl_irq(SH2 *sh2, int level)
- {
- sh2->pending_irl = level;
- if (level > sh2->pending_int_irq)
- sh2->pending_level = level;
- else
- sh2->pending_level = sh2->pending_int_irq;
- 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->pending_level)
- sh2->pending_level = level;
- sh2->test_irq = 1;
- }
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