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https://github.com/hsoft/collapseos.git
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245 lines
6.3 KiB
C
245 lines
6.3 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "../libz80/z80.h"
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#include "kernel-bin.h"
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#include "zasm-bin.h"
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/* zasm reads from a specified blkdev, assemble the file and writes the result
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* in another specified blkdev. In our emulator layer, we use stdin and stdout
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* as those specified blkdevs.
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*
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* This executable takes two arguments. Both are optional, but you need to
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* specify the first one if you want to get to the second one.
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* The first one is the value to send to z80-zasm's 3rd argument (the initial
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* .org). Defaults to '00'.
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* The second one is the path to a .cfs file to use for includes.
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*
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* Because the input blkdev needs support for Seek, we buffer it in the emulator
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* layer.
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*
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* Memory layout:
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*
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* 0x0000 - 0x3fff: ROM code from zasm_glue.asm
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* 0x4000 - 0x47ff: RAM for kernel and stack
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* 0x4800 - 0x57ff: Userspace code
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* 0x5800 - 0xffff: Userspace RAM
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*
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* I/O Ports:
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*
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* 0 - stdin / stdout
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* 1 - When written to, rewind stdin buffer to the beginning.
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*/
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// in sync with zasm_glue.asm
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#define USER_CODE 0x4800
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#define STDIO_PORT 0x00
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#define STDIN_SEEK_PORT 0x01
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#define FS_DATA_PORT 0x02
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#define FS_SEEK_PORT 0x03
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#define STDERR_PORT 0x04
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// Other consts
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#define STDIN_BUFSIZE 0x8000
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// When defined, we dump memory instead of dumping expected stdout
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//#define MEMDUMP
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//#define DEBUG
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// By default, we don't spit what zasm prints. Too noisy. Define VERBOSE if
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// you want to spit this content to stderr.
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//#define VERBOSE
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static Z80Context cpu;
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static uint8_t mem[0x10000];
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// STDIN buffer, allows us to seek and tell
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static uint8_t inpt[STDIN_BUFSIZE];
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static int inpt_size;
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static int inpt_ptr;
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static uint8_t middle_of_seek_tell = 0;
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static uint8_t fsdev[0x40000] = {0};
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static uint32_t fsdev_size = 0;
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static uint32_t fsdev_ptr = 0;
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static uint8_t fsdev_seek_tell_cnt = 0;
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static uint8_t io_read(int unused, uint16_t addr)
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{
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addr &= 0xff;
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if (addr == STDIO_PORT) {
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if (inpt_ptr < inpt_size) {
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return inpt[inpt_ptr++];
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} else {
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return 0;
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}
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} else if (addr == STDIN_SEEK_PORT) {
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if (middle_of_seek_tell) {
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middle_of_seek_tell = 0;
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return inpt_ptr & 0xff;
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} else {
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#ifdef DEBUG
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fprintf(stderr, "tell %d\n", inpt_ptr);
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#endif
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middle_of_seek_tell = 1;
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return inpt_ptr >> 8;
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}
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} else if (addr == FS_DATA_PORT) {
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if (fsdev_ptr < fsdev_size) {
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return fsdev[fsdev_ptr++];
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} else {
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return 0;
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}
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} else if (addr == FS_SEEK_PORT) {
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if (fsdev_seek_tell_cnt != 0) {
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return fsdev_seek_tell_cnt;
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} else if (fsdev_ptr >= fsdev_size) {
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return 1;
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} else {
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return 0;
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}
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} else {
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fprintf(stderr, "Out of bounds I/O read: %d\n", addr);
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return 0;
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}
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}
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static void io_write(int unused, uint16_t addr, uint8_t val)
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{
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addr &= 0xff;
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if (addr == STDIO_PORT) {
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// When mem-dumping, we don't output regular stuff.
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#ifndef MEMDUMP
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putchar(val);
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#endif
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} else if (addr == STDIN_SEEK_PORT) {
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if (middle_of_seek_tell) {
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inpt_ptr |= val;
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middle_of_seek_tell = 0;
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#ifdef DEBUG
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fprintf(stderr, "seek %d\n", inpt_ptr);
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#endif
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} else {
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inpt_ptr = (val << 8) & 0xff00;
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middle_of_seek_tell = 1;
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}
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} else if (addr == FS_DATA_PORT) {
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if (fsdev_ptr < fsdev_size) {
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fsdev[fsdev_ptr++] = val;
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}
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} else if (addr == FS_SEEK_PORT) {
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if (fsdev_seek_tell_cnt == 0) {
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fsdev_ptr = val << 16;
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fsdev_seek_tell_cnt = 1;
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} else if (fsdev_seek_tell_cnt == 1) {
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fsdev_ptr |= val << 8;
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fsdev_seek_tell_cnt = 2;
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} else {
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fsdev_ptr |= val;
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fsdev_seek_tell_cnt = 0;
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#ifdef DEBUG
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fprintf(stderr, "FS seek %d\n", fsdev_ptr);
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#endif
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}
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} else if (addr == STDERR_PORT) {
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#ifdef VERBOSE
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fputc(val, stderr);
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#endif
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} else {
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fprintf(stderr, "Out of bounds I/O write: %d / %d (0x%x)\n", addr, val, val);
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}
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}
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static uint8_t mem_read(int unused, uint16_t addr)
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{
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return mem[addr];
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}
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static void mem_write(int unused, uint16_t addr, uint8_t val)
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{
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mem[addr] = val;
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}
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int main(int argc, char *argv[])
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{
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if (argc > 3) {
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fprintf(stderr, "Too many args\n");
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return 1;
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}
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// initialize memory
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for (int i=0; i<sizeof(KERNEL); i++) {
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mem[i] = KERNEL[i];
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}
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for (int i=0; i<sizeof(USERSPACE); i++) {
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mem[i+USER_CODE] = USERSPACE[i];
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}
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char *init_org = "00";
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if (argc >= 2) {
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init_org = argv[1];
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if (strlen(init_org) != 2) {
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fprintf(stderr, "Initial org must be a two-character hex string");
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}
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}
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// glue.asm knows that it needs to fetch these arguments at this address.
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mem[0xff00] = init_org[0];
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mem[0xff01] = init_org[1];
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fsdev_size = 0;
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if (argc == 3) {
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FILE *fp = fopen(argv[2], "r");
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if (fp == NULL) {
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fprintf(stderr, "Can't open file %s\n", argv[1]);
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return 1;
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}
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int c = fgetc(fp);
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while (c != EOF) {
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fsdev[fsdev_size] = c;
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fsdev_size++;
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c = fgetc(fp);
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}
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fclose(fp);
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}
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// read stdin in buffer
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inpt_size = 0;
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inpt_ptr = 0;
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int c = getchar();
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while (c != EOF) {
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inpt[inpt_ptr] = c & 0xff;
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inpt_ptr++;
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if (inpt_ptr == STDIN_BUFSIZE) {
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break;
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}
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c = getchar();
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}
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inpt_size = inpt_ptr;
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inpt_ptr = 0;
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Z80RESET(&cpu);
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cpu.ioRead = io_read;
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cpu.ioWrite = io_write;
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cpu.memRead = mem_read;
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cpu.memWrite = mem_write;
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while (!cpu.halted) {
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Z80Execute(&cpu);
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}
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#ifdef MEMDUMP
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for (int i=0; i<0x10000; i++) {
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putchar(mem[i]);
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}
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#endif
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fflush(stdout);
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int res = cpu.R1.br.A;
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if (res != 0) {
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int lineno = cpu.R1.wr.HL;
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int inclineno = cpu.R1.wr.DE;
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if (inclineno) {
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fprintf(
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stderr,
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"Error %d on line %d, include line %d\n",
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res,
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lineno,
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inclineno);
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} else {
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fprintf(stderr, "Error %d on line %d\n", res, lineno);
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}
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}
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return res;
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}
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