3b1emu: src/state.c@a392eb8f9806 (annotated)

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src/state.c@a392eb8f9806 (annotated)

src/state.c

Sat, 17 Nov 2012 19:18:29 +0000

author: Philip Pemberton <philpem@philpem.me.uk>
date: Sat, 17 Nov 2012 19:18:29 +0000
changeset 112: a392eb8f9806
parent 101: e20f02519835
child 138: d744db15cdf7
permissions: -rw-r--r--

add HDD support + fixes

Patch-Author: Andrew Warkentin <andreww591!gmail>
Patch-Message-ID: <50A772FC.8020009@gmail.com>

I have added floppy write support, full hard disk emulation, and proper handling of DMA page faults to FreeBee. I also fixed the floppy step commands, changed the "force interrupt" floppy command to generate a type 1 status, and changed the DMA address counter to reset to 3fff when a transfer completes (which is what Unix seems to expect - without it, the kernel says that the floppy isn't ready). The floppy, hard disk, and DMA page fault tests all pass. Initializing hard disks and floppies also works (the geometry for both is still fixed by the size of the image, though, and format commands only appear to succeed, but they don't modify the image). Unix still doesn't run, though (it hangs after reading some sectors from the floppy).

 #define _STATE_C
 #include <stddef.h>
 #include <malloc.h>
 #include <stdio.h>
 #include "wd279x.h"
 #include "wd2010.h"
 #include "keyboard.h"
 #include "state.h"
 int state_init(size_t base_ram_size, size_t exp_ram_size)
 {
 	// Free RAM if it's allocated
 	if (state.base_ram != NULL)
 		free(state.base_ram);
 	if (state.exp_ram != NULL)
 		free(state.exp_ram);
 	// Initialise hardware registers
 	state.romlmap = false;
 	state.idmarw = state.dmaen = state.dmaenb = false;
 	state.dma_count = state.dma_address = 0;
 	state.pie = 0;
 	state.ee = 0;
 	state.leds = 0;
 	state.genstat = 0;				// FIXME: check this
 	state.bsr0 = state.bsr1 = 0;	// FIXME: check this
 	state.timer_enabled = state.timer_asserted = false;
 	// Allocate Base RAM, making sure the user has specified a valid RAM amount first
 	// Basically: 512KiB minimum, 2MiB maximum, in increments of 512KiB.
 	if ((base_ram_size < 512*1024) || (base_ram_size > 2048*1024) || ((base_ram_size % (512*1024)) != 0))
 		return -1;
 	state.base_ram = malloc(base_ram_size);
 	if (state.base_ram == NULL)
 		return -2;
 	state.base_ram_size = base_ram_size;
 	// Now allocate expansion RAM
 	// The difference here is that we can have zero bytes of Expansion RAM; we're not limited to having a minimum of 512KiB.
 	if ((exp_ram_size > 2048*1024) || ((exp_ram_size % (512*1024)) != 0))
 		return -1;
 	state.exp_ram = malloc(exp_ram_size);
 	if (state.exp_ram == NULL)
 		return -2;
 	state.exp_ram_size = exp_ram_size;
 	// Load ROMs
 	FILE *r14c, *r15c;
 	r14c = fopen("roms/14c.bin", "rb");
 	if (r14c == NULL) {
 		fprintf(stderr, "[state] Error loading roms/14c.bin.\n");
 		return -3;
 	}
 	r15c = fopen("roms/15c.bin", "rb");
 	if (r15c == NULL) {
 		fprintf(stderr, "[state] Error loading roms/15c.bin.\n");
 		return -3;
 	}
 	// get ROM file size
 	fseek(r14c, 0, SEEK_END);
 	size_t romlen = ftell(r14c);
 	fseek(r14c, 0, SEEK_SET);
 	fseek(r15c, 0, SEEK_END);
 	size_t romlen2 = ftell(r15c);
 	fseek(r15c, 0, SEEK_SET);
 	if (romlen2 != romlen) {
 		fprintf(stderr, "[state] ROMs are not the same size!\n");
 		return -3;
 	}
 	if ((romlen + romlen2) > ROM_SIZE) {
 		fprintf(stderr, "[state] ROM files are too large!\n");
 		return -3;
 	}
 	// sanity checks completed; load the ROMs!
 	uint8_t *romdat1, *romdat2;
 	romdat1 = malloc(romlen);
 	romdat2 = malloc(romlen2);
 	fread(romdat1, 1, romlen, r15c);
 	fread(romdat2, 1, romlen2, r14c);
 	// convert the ROM data
 	for (size_t i=0; i<(romlen + romlen2); i+=2) {
 		state.rom[i+0] = romdat1[i/2];
 		state.rom[i+1] = romdat2[i/2];
 	}
 	// TODO: if ROM buffer not filled, repeat the ROM data we read until it is (wraparound emulation)
 	// free the data arrays and close the files
 	free(romdat1);
 	free(romdat2);
 	fclose(r14c);
 	fclose(r15c);
 	// Initialise the disc controller
 	wd2797_init(&state.fdc_ctx);
 	// Initialise the keyboard controller
 	keyboard_init(&state.kbd);
 	return 0;
 }
 void state_done()
 {
 	if (state.base_ram != NULL) {
 		free(state.base_ram);
 		state.base_ram = NULL;
 	}
 	if (state.exp_ram != NULL) {
 		free(state.exp_ram);
 		state.exp_ram = NULL;
 	}
 	// Deinitialise the disc controller
 	wd2797_done(&state.fdc_ctx);
 	wd2010_done(&state.hdc_ctx);
 }

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src/state.c@a392eb8f9806 (annotated)

src/state.c