| 1 | #include <string.h> |
| 2 | #include "sh2.h" |
| 3 | #include "compiler.h" |
| 4 | |
| 5 | #define I 0xf0 |
| 6 | |
| 7 | int sh2_init(SH2 *sh2, int is_slave) |
| 8 | { |
| 9 | int ret = 0; |
| 10 | |
| 11 | memset(sh2, 0, sizeof(*sh2)); |
| 12 | sh2->is_slave = is_slave; |
| 13 | #ifdef DRC_SH2 |
| 14 | ret = sh2_drc_init(sh2); |
| 15 | #endif |
| 16 | return ret; |
| 17 | } |
| 18 | |
| 19 | void sh2_finish(SH2 *sh2) |
| 20 | { |
| 21 | #ifdef DRC_SH2 |
| 22 | sh2_drc_finish(sh2); |
| 23 | #endif |
| 24 | } |
| 25 | |
| 26 | void sh2_reset(SH2 *sh2) |
| 27 | { |
| 28 | sh2->pc = p32x_sh2_read32(0, sh2); |
| 29 | sh2->r[15] = p32x_sh2_read32(4, sh2); |
| 30 | sh2->sr = I; |
| 31 | sh2->vbr = 0; |
| 32 | sh2->pending_int_irq = 0; |
| 33 | } |
| 34 | |
| 35 | void sh2_do_irq(SH2 *sh2, int level, int vector) |
| 36 | { |
| 37 | sh2->irq_callback(sh2->is_slave, level); |
| 38 | |
| 39 | sh2->r[15] -= 4; |
| 40 | p32x_sh2_write32(sh2->r[15], sh2->sr, sh2); /* push SR onto stack */ |
| 41 | sh2->r[15] -= 4; |
| 42 | p32x_sh2_write32(sh2->r[15], sh2->pc, sh2); /* push PC onto stack */ |
| 43 | |
| 44 | /* set I flags in SR */ |
| 45 | sh2->sr = (sh2->sr & ~I) | (level << 4); |
| 46 | |
| 47 | /* fetch PC */ |
| 48 | sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2); |
| 49 | |
| 50 | /* 13 cycles at best */ |
| 51 | sh2->cycles_done += 13; |
| 52 | // sh2->icount -= 13; |
| 53 | } |
| 54 | |
| 55 | void sh2_irl_irq(SH2 *sh2, int level) |
| 56 | { |
| 57 | sh2->pending_irl = level; |
| 58 | if (level > sh2->pending_int_irq) |
| 59 | sh2->pending_level = level; |
| 60 | else |
| 61 | sh2->pending_level = sh2->pending_int_irq; |
| 62 | |
| 63 | sh2->test_irq = 1; |
| 64 | } |
| 65 | |
| 66 | void sh2_internal_irq(SH2 *sh2, int level, int vector) |
| 67 | { |
| 68 | // FIXME: multiple internal irqs not handled.. |
| 69 | // assuming internal irqs never clear until accepted |
| 70 | sh2->pending_int_irq = level; |
| 71 | sh2->pending_int_vector = vector; |
| 72 | if (level > sh2->pending_level) |
| 73 | sh2->pending_level = level; |
| 74 | |
| 75 | sh2->test_irq = 1; |
| 76 | } |
| 77 | |