sh2.c 1.5 KB

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  1. #include <string.h>
  2. #include "sh2.h"
  3. #include "../debug.h"
  4. #include "compiler.h"
  5. #define I 0xf0
  6. SH2 *sh2; // active sh2
  7. int sh2_init(SH2 *sh2, int is_slave)
  8. {
  9. int ret = 0;
  10. memset(sh2, 0, sizeof(*sh2));
  11. sh2->is_slave = is_slave;
  12. pdb_register_cpu(sh2, PDBCT_SH2, is_slave ? "ssh2" : "msh2");
  13. #ifdef DRC_SH2
  14. ret = sh2_drc_init(sh2);
  15. #endif
  16. return ret;
  17. }
  18. void sh2_finish(SH2 *sh2)
  19. {
  20. #ifdef DRC_SH2
  21. sh2_drc_finish(sh2);
  22. #endif
  23. }
  24. void sh2_reset(SH2 *sh2)
  25. {
  26. sh2->pc = p32x_sh2_read32(0, sh2);
  27. sh2->r[15] = p32x_sh2_read32(4, sh2);
  28. sh2->sr = I;
  29. sh2->vbr = 0;
  30. sh2->pending_int_irq = 0;
  31. }
  32. void sh2_do_irq(SH2 *sh2, int level, int vector)
  33. {
  34. sh2->r[15] -= 4;
  35. p32x_sh2_write32(sh2->r[15], sh2->sr, sh2); /* push SR onto stack */
  36. sh2->r[15] -= 4;
  37. p32x_sh2_write32(sh2->r[15], sh2->pc, sh2); /* push PC onto stack */
  38. /* set I flags in SR */
  39. sh2->sr = (sh2->sr & ~I) | (level << 4);
  40. /* fetch PC */
  41. sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2);
  42. /* 13 cycles at best */
  43. sh2->cycles_done += 13;
  44. // sh2->icount -= 13;
  45. }
  46. void sh2_irl_irq(SH2 *sh2, int level)
  47. {
  48. sh2->pending_irl = level;
  49. if (level > sh2->pending_int_irq)
  50. sh2->pending_level = level;
  51. else
  52. sh2->pending_level = sh2->pending_int_irq;
  53. sh2->test_irq = 1;
  54. }
  55. void sh2_internal_irq(SH2 *sh2, int level, int vector)
  56. {
  57. // FIXME: multiple internal irqs not handled..
  58. // assuming internal irqs never clear until accepted
  59. sh2->pending_int_irq = level;
  60. sh2->pending_int_vector = vector;
  61. if (level > sh2->pending_level)
  62. sh2->pending_level = level;
  63. sh2->test_irq = 1;
  64. }