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annotate backend.c @ 995:2bc27415565b

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Fix some stuff with interrupt timing. The change in adjust_int_cycle gets Overdrive working again (vint was not being preferred over hint in some cases). One of the changes seems to have broken Fatal Rewind again, but no other regressions that I can see.
author Michael Pavone <pavone@retrodev.com>
date Sat, 30 Apr 2016 08:37:55 -0700
parents fc04781f4d28
children 329ff62ea391
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rev   line source
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include "backend.h"
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7 #include <stdlib.h>
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8
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9 deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest)
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10 {
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11 deferred_addr * new_head = malloc(sizeof(deferred_addr));
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12 new_head->next = old_head;
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13 new_head->address = address & 0xFFFFFF;
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14 new_head->dest = dest;
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15 return new_head;
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16 }
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17
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18 void remove_deferred_until(deferred_addr **head_ptr, deferred_addr * remove_to)
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19 {
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20 for(deferred_addr *cur = *head_ptr; cur && cur != remove_to; cur = *head_ptr)
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21 {
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22 *head_ptr = cur->next;
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23 free(cur);
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24 }
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25 }
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26
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27 void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native)
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28 {
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29 deferred_addr * cur = *head_ptr;
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30 deferred_addr **last_next = head_ptr;
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31 while(cur)
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32 {
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33 code_ptr native = get_native(context, cur->address);//get_native_address(opts->native_code_map, cur->address);
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34 if (native) {
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35 int32_t disp = native - (cur->dest + 4);
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36 code_ptr out = cur->dest;
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37 *(out++) = disp;
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38 disp >>= 8;
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39 *(out++) = disp;
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40 disp >>= 8;
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41 *(out++) = disp;
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42 disp >>= 8;
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43 *out = disp;
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44 *last_next = cur->next;
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45 free(cur);
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46 cur = *last_next;
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47 } else {
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48 last_next = &(cur->next);
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49 cur = cur->next;
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50 }
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51 }
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52 }
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53
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54 void * get_native_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts)
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55 {
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56 memmap_chunk const * memmap = opts->memmap;
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57 address &= opts->address_mask;
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58 for (uint32_t chunk = 0; chunk < opts->memmap_chunks; chunk++)
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59 {
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60 if (address >= memmap[chunk].start && address < memmap[chunk].end) {
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61 if (!(memmap[chunk].flags & MMAP_READ)) {
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62 return NULL;
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63 }
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64 uint8_t * base = memmap[chunk].flags & MMAP_PTR_IDX
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65 ? mem_pointers[memmap[chunk].ptr_index]
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66 : memmap[chunk].buffer;
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67 if (!base) {
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68 return NULL;
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69 }
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70 return base + (address & memmap[chunk].mask);
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71 }
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72 }
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73 return NULL;
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74 }
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76 uint32_t chunk_size(cpu_options *opts, memmap_chunk const *chunk)
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77 {
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78 if (chunk->mask == opts->address_mask) {
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79 return chunk->end - chunk->start;
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80 } else {
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81 return chunk->mask + 1;
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82 }
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83 }
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84
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85 uint32_t ram_size(cpu_options *opts)
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86 {
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87 uint32_t size = 0;
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88 for (int i = 0; i < opts->memmap_chunks; i++)
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89 {
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90 if ((opts->memmap[i].flags & (MMAP_WRITE | MMAP_CODE)) == (MMAP_WRITE | MMAP_CODE)) {
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91 if (opts->memmap[i].mask == opts->address_mask) {
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92 size += opts->memmap[i].end - opts->memmap[i].start;
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93 } else {
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94 size += opts->memmap[i].mask + 1;
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95 }
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96 }
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97 }
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98 return size;
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99 }