src/state.c

Thu, 03 Mar 2011 13:05:21 +0000

author
Philip Pemberton <philpem@philpem.me.uk>
date
Thu, 03 Mar 2011 13:05:21 +0000
changeset 100
d6f699f89303
parent 97
240e195e4bed
child 101
e20f02519835
permissions
-rw-r--r--

Fix broken pagebit update code (was failing S4TEST 19 Map Translation test)

philpem@18 1 #define _STATE_C
philpem@18 2 #include <stddef.h>
philpem@18 3 #include <malloc.h>
philpem@18 4 #include <stdio.h>
philpem@52 5 #include "wd279x.h"
philpem@80 6 #include "keyboard.h"
philpem@18 7 #include "state.h"
philpem@18 8
philpem@62 9 int state_init(size_t base_ram_size, size_t exp_ram_size)
philpem@18 10 {
philpem@18 11 // Free RAM if it's allocated
philpem@60 12 if (state.base_ram != NULL)
philpem@60 13 free(state.base_ram);
philpem@62 14 if (state.exp_ram != NULL)
philpem@62 15 free(state.exp_ram);
philpem@18 16
philpem@18 17 // Initialise hardware registers
philpem@18 18 state.romlmap = false;
philpem@75 19 state.idmarw = state.dmaen = state.dmaenb = false;
philpem@75 20 state.dma_count = state.dma_address = 0;
philpem@75 21 state.pie = 0;
philpem@75 22 state.leds = 0;
philpem@75 23 state.genstat = 0; // FIXME: check this
philpem@75 24 state.bsr0 = state.bsr1 = 0; // FIXME: check this
philpem@97 25 state.timer_enabled = state.timer_asserted = false;
philpem@62 26 // Allocate Base RAM, making sure the user has specified a valid RAM amount first
philpem@62 27 // Basically: 512KiB minimum, 2MiB maximum, in increments of 512KiB.
philpem@62 28 if ((base_ram_size < 512*1024) || (base_ram_size > 2048*1024) || ((base_ram_size % (512*1024)) != 0))
philpem@18 29 return -1;
philpem@62 30 state.base_ram = malloc(base_ram_size);
philpem@60 31 if (state.base_ram == NULL)
philpem@18 32 return -2;
philpem@62 33 state.base_ram_size = base_ram_size;
philpem@62 34
philpem@62 35 // Now allocate expansion RAM
philpem@62 36 // The difference here is that we can have zero bytes of Expansion RAM; we're not limited to having a minimum of 512KiB.
philpem@62 37 if ((exp_ram_size > 2048*1024) || ((exp_ram_size % (512*1024)) != 0))
philpem@62 38 return -1;
philpem@62 39 state.exp_ram = malloc(exp_ram_size);
philpem@62 40 if (state.exp_ram == NULL)
philpem@62 41 return -2;
philpem@62 42 state.exp_ram_size = exp_ram_size;
philpem@18 43
philpem@18 44 // Load ROMs
philpem@18 45 FILE *r14c, *r15c;
philpem@18 46 r14c = fopen("roms/14c.bin", "rb");
philpem@55 47 if (r14c == NULL) {
philpem@55 48 fprintf(stderr, "[state] Error loading roms/14c.bin.\n");
philpem@55 49 return -3;
philpem@55 50 }
philpem@18 51 r15c = fopen("roms/15c.bin", "rb");
philpem@55 52 if (r15c == NULL) {
philpem@55 53 fprintf(stderr, "[state] Error loading roms/15c.bin.\n");
philpem@55 54 return -3;
philpem@55 55 }
philpem@18 56
philpem@18 57 // get ROM file size
philpem@18 58 fseek(r14c, 0, SEEK_END);
philpem@18 59 size_t romlen = ftell(r14c);
philpem@18 60 fseek(r14c, 0, SEEK_SET);
philpem@18 61 fseek(r15c, 0, SEEK_END);
philpem@18 62 size_t romlen2 = ftell(r15c);
philpem@18 63 fseek(r15c, 0, SEEK_SET);
philpem@55 64 if (romlen2 != romlen) {
philpem@55 65 fprintf(stderr, "[state] ROMs are not the same size!\n");
philpem@55 66 return -3;
philpem@55 67 }
philpem@55 68 if ((romlen + romlen2) > ROM_SIZE) {
philpem@55 69 fprintf(stderr, "[state] ROM files are too large!\n");
philpem@55 70 return -3;
philpem@55 71 }
philpem@18 72
philpem@18 73 // sanity checks completed; load the ROMs!
philpem@18 74 uint8_t *romdat1, *romdat2;
philpem@18 75 romdat1 = malloc(romlen);
philpem@18 76 romdat2 = malloc(romlen2);
philpem@18 77 fread(romdat1, 1, romlen, r15c);
philpem@18 78 fread(romdat2, 1, romlen2, r14c);
philpem@18 79
philpem@18 80 // convert the ROM data
philpem@18 81 for (size_t i=0; i<(romlen + romlen2); i+=2) {
philpem@18 82 state.rom[i+0] = romdat1[i/2];
philpem@18 83 state.rom[i+1] = romdat2[i/2];
philpem@18 84 }
philpem@18 85
philpem@18 86 // TODO: if ROM buffer not filled, repeat the ROM data we read until it is (wraparound emulation)
philpem@18 87
philpem@18 88 // free the data arrays and close the files
philpem@18 89 free(romdat1);
philpem@18 90 free(romdat2);
philpem@18 91 fclose(r14c);
philpem@18 92 fclose(r15c);
philpem@18 93
philpem@52 94 // Initialise the disc controller
philpem@52 95 wd2797_init(&state.fdc_ctx);
philpem@80 96 // Initialise the keyboard controller
philpem@80 97 keyboard_init(&state.kbd);
philpem@52 98
philpem@18 99 return 0;
philpem@18 100 }
philpem@18 101
philpem@18 102 void state_done()
philpem@18 103 {
philpem@60 104 if (state.base_ram != NULL) {
philpem@60 105 free(state.base_ram);
philpem@60 106 state.base_ram = NULL;
philpem@18 107 }
philpem@62 108
philpem@62 109 if (state.exp_ram != NULL) {
philpem@62 110 free(state.exp_ram);
philpem@62 111 state.exp_ram = NULL;
philpem@62 112 }
philpem@62 113
philpem@52 114 // Deinitialise the disc controller
philpem@52 115 wd2797_done(&state.fdc_ctx);
philpem@18 116 }
philpem@18 117
philpem@18 118