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