mirror of
https://github.com/hsoft/collapseos.git
synced 2024-09-08 01:48:45 +10:00
154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <termios.h>
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#include "../libz80/z80.h"
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#include "kernel.h"
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/* Collapse OS shell with filesystem
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*
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* On startup, if "cfsin" directory exists, it packs it as a afke block device
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* and loads it in. Upon halting, unpcks the contents of that block device in
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* "cfsout" directory.
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*
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* Memory layout:
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*
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* 0x0000 - 0x3fff: ROM code from shell.asm
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* 0x4000 - 0x4fff: Kernel memory
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* 0x5000 - 0xffff: Userspace
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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 - Filesystem blockdev data read/write. Reading and writing to it advances
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* the pointer.
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* 2 - Filesystem blockdev seek / tell. Low byte
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* 3 - Filesystem blockdev seek / tell. High byte
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*/
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// in sync with shell.asm
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#define RAMSTART 0x4000
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#define STDIO_PORT 0x00
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#define FS_DATA_PORT 0x01
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#define FS_SEEKL_PORT 0x02
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#define FS_SEEKH_PORT 0x03
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static Z80Context cpu;
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static uint8_t mem[0xffff] = {0};
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static uint8_t fsdev[0xffff] = {0};
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static uint16_t fsdev_size = 0;
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static uint16_t fsdev_ptr = 0;
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static int running;
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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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uint8_t c = getchar();
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if (c == EOF) {
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running = 0;
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}
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return c;
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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_SEEKL_PORT) {
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return fsdev_ptr & 0xff;
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} else if (addr == FS_SEEKH_PORT) {
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return fsdev_ptr >> 8;
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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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if (val == 0x04) { // CTRL+D
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running = 0;
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} else {
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putchar(val);
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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_SEEKL_PORT) {
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fsdev_ptr = (fsdev_ptr & 0xff00) | val;
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} else if (addr == FS_SEEKH_PORT) {
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fsdev_ptr = (fsdev_ptr & 0x00ff) | (val << 8);
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} else {
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fprintf(stderr, "Out of bounds I/O write: %d / %d\n", addr, 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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if (addr < RAMSTART) {
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fprintf(stderr, "Writing to ROM (%d)!\n", addr);
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}
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mem[addr] = val;
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}
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int main()
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{
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// Setup fs blockdev
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FILE *fp = popen("../cfspack/cfspack cfsin", "r");
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if (fp != NULL) {
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printf("Initializing filesystem\n");
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int i = 0;
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int c = fgetc(fp);
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while (c != EOF) {
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fsdev[i] = c & 0xff;
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i++;
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c = fgetc(fp);
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}
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fsdev_size = i;
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pclose(fp);
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} else {
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printf("Can't initialize filesystem. Leaving blank.\n");
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}
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// Turn echo off: the shell takes care of its own echoing.
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struct termios termInfo;
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if (tcgetattr(0, &termInfo) == -1) {
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printf("Can't setup terminal.\n");
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return 1;
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}
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termInfo.c_lflag &= ~ECHO;
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termInfo.c_lflag &= ~ICANON;
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tcsetattr(0, TCSAFLUSH, &termInfo);
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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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// Run!
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running = 1;
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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 (running && !cpu.halted) {
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Z80Execute(&cpu);
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}
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printf("Done!\n");
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termInfo.c_lflag |= ECHO;
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termInfo.c_lflag |= ICANON;
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tcsetattr(0, TCSAFLUSH, &termInfo);
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return 0;
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}
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