src/state.c

Wed, 29 Dec 2010 09:04:43 +0000

author
Philip Pemberton <philpem@philpem.me.uk>
date
Wed, 29 Dec 2010 09:04:43 +0000
changeset 78
c149c13aff1c
parent 62
c895256b528d
parent 75
976dfa068839
child 79
674226015c8a
permissions
-rw-r--r--

merge heads (properly this time)

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