| 1 | #include <string.h> |
| 2 | #include "sh2.h" |
| 3 | |
| 4 | #define I 0xf0 |
| 5 | |
| 6 | void sh2_init(SH2 *sh2, int is_slave) |
| 7 | { |
| 8 | memset(sh2, 0, sizeof(*sh2)); |
| 9 | sh2->is_slave = is_slave; |
| 10 | } |
| 11 | |
| 12 | void sh2_reset(SH2 *sh2) |
| 13 | { |
| 14 | sh2->pc = p32x_sh2_read32(0, sh2->is_slave); |
| 15 | sh2->r[15] = p32x_sh2_read32(4, sh2->is_slave); |
| 16 | sh2->sr = I; |
| 17 | sh2->vbr = 0; |
| 18 | sh2->pending_int_irq = 0; |
| 19 | } |
| 20 | |
| 21 | static void sh2_do_irq(SH2 *sh2, int level, int vector) |
| 22 | { |
| 23 | sh2->irq_callback(sh2->is_slave, level); |
| 24 | |
| 25 | sh2->r[15] -= 4; |
| 26 | p32x_sh2_write32(sh2->r[15], sh2->sr, sh2->is_slave); /* push SR onto stack */ |
| 27 | sh2->r[15] -= 4; |
| 28 | p32x_sh2_write32(sh2->r[15], sh2->pc, sh2->is_slave); /* push PC onto stack */ |
| 29 | |
| 30 | /* set I flags in SR */ |
| 31 | sh2->sr = (sh2->sr & ~I) | (level << 4); |
| 32 | |
| 33 | /* fetch PC */ |
| 34 | sh2->pc = p32x_sh2_read32(sh2->vbr + vector * 4, sh2->is_slave); |
| 35 | |
| 36 | /* 13 cycles at best */ |
| 37 | sh2->cycles_done += 13; |
| 38 | // sh2->icount -= 13; |
| 39 | } |
| 40 | |
| 41 | void sh2_irl_irq(SH2 *sh2, int level) |
| 42 | { |
| 43 | sh2->pending_irl = level; |
| 44 | if (level <= ((sh2->sr >> 4) & 0x0f)) |
| 45 | return; |
| 46 | |
| 47 | sh2_do_irq(sh2, level, 64 + level/2); |
| 48 | } |
| 49 | |
| 50 | void sh2_internal_irq(SH2 *sh2, int level, int vector) |
| 51 | { |
| 52 | sh2->pending_int_irq = level; |
| 53 | sh2->pending_int_vector = vector; |
| 54 | if (level <= ((sh2->sr >> 4) & 0x0f)) |
| 55 | return; |
| 56 | |
| 57 | sh2_do_irq(sh2, level, vector); |
| 58 | sh2->pending_int_irq = 0; // auto-clear |
| 59 | } |
| 60 | |