mirror of
https://github.com/hsoft/collapseos.git
synced 2024-09-07 13:08:46 +10:00
209 lines
5.5 KiB
C
209 lines
5.5 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <termios.h>
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#include "../emul.h"
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#include "shell-bin.h"
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#include "../../tools/cfspack/cfs.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. Reads and write data to the address
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* previously selected through port 2
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*/
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//#define DEBUG
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#define MAX_FSDEV_SIZE 0x20000
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// in sync with glue.asm
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#define RAMSTART 0x2000
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#define STDIO_PORT 0x00
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#define FS_DATA_PORT 0x01
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// Controls what address (24bit) the data port returns. To select an address,
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// this port has to be written to 3 times, starting with the MSB.
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// Reading this port returns an out-of-bounds indicator. Meaning:
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// 0 means addr is within bounds
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// 1 means that we're equal to fsdev size (error for reading, ok for writing)
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// 2 means more than fsdev size (always invalid)
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// 3 means incomplete addr setting
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#define FS_ADDR_PORT 0x02
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static uint8_t fsdev[MAX_FSDEV_SIZE] = {0};
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static uint32_t fsdev_ptr = 0;
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// 0 = idle, 1 = received MSB (of 24bit addr), 2 = received middle addr
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static int fsdev_addr_lvl = 0;
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static int running;
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static uint8_t iord_stdio()
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{
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int c = getchar();
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if (c == EOF) {
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running = 0;
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}
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return (uint8_t)c;
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}
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static uint8_t iord_fsdata()
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{
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if (fsdev_addr_lvl != 0) {
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fprintf(stderr, "Reading FSDEV in the middle of an addr op (%d)\n", fsdev_ptr);
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return 0;
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}
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if (fsdev_ptr < MAX_FSDEV_SIZE) {
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#ifdef DEBUG
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fprintf(stderr, "Reading FSDEV at offset %d\n", fsdev_ptr);
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#endif
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return fsdev[fsdev_ptr];
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} else {
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fprintf(stderr, "Out of bounds FSDEV read at %d\n", fsdev_ptr);
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return 0;
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}
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}
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static uint8_t iord_fsaddr()
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{
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if (fsdev_addr_lvl != 0) {
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return 3;
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} else if (fsdev_ptr >= MAX_FSDEV_SIZE) {
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fprintf(stderr, "Out of bounds FSDEV addr request at %d / %d\n", fsdev_ptr, MAX_FSDEV_SIZE);
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return 2;
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} else {
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return 0;
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}
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}
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static void iowr_stdio(uint8_t val)
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{
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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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}
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static void iowr_fsdata(uint8_t val)
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{
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if (fsdev_addr_lvl != 0) {
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fprintf(stderr, "Writing to FSDEV in the middle of an addr op (%d)\n", fsdev_ptr);
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return;
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}
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if (fsdev_ptr < MAX_FSDEV_SIZE) {
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#ifdef DEBUG
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fprintf(stderr, "Writing to FSDEV (%d)\n", fsdev_ptr);
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#endif
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fsdev[fsdev_ptr] = val;
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} else {
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fprintf(stderr, "Out of bounds FSDEV write at %d\n", fsdev_ptr);
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}
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}
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static void iowr_fsaddr(uint8_t val)
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{
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if (fsdev_addr_lvl == 0) {
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fsdev_ptr = val << 16;
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fsdev_addr_lvl = 1;
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} else if (fsdev_addr_lvl == 1) {
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fsdev_ptr |= val << 8;
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fsdev_addr_lvl = 2;
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} else {
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fsdev_ptr |= val;
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fsdev_addr_lvl = 0;
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}
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}
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int main(int argc, char *argv[])
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{
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FILE *fp = NULL;
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while (1) {
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int c = getopt(argc, argv, "f:");
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if (c < 0) {
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break;
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}
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switch (c) {
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case 'f':
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fp = fopen(optarg, "r");
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if (fp == NULL) {
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fprintf(stderr, "Can't open %s\n", optarg);
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return 1;
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}
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fprintf(stderr, "Initializing filesystem from %s\n", optarg);
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int i = 0;
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int c;
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while ((c = fgetc(fp)) != EOF && i < MAX_FSDEV_SIZE) {
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fsdev[i++] = c & 0xff;
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}
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if (i == MAX_FSDEV_SIZE) {
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fprintf(stderr, "Filesytem image too large.\n");
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return 1;
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}
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pclose(fp);
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break;
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default:
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fprintf(stderr, "Usage: shell [-f fsdev]\n");
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return 1;
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}
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}
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// Setup fs blockdev
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if (fp == NULL) {
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fprintf(stderr, "Initializing filesystem from cfsin\n");
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fp = fmemopen(fsdev, MAX_FSDEV_SIZE, "w");
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set_spit_stream(fp);
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if (spitdir("cfsin", "", NULL) != 0) {
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fprintf(stderr, "Can't initialize filesystem. Leaving blank.\n");
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}
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fclose(fp);
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}
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bool tty = isatty(fileno(stdin));
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struct termios termInfo;
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if (tty) {
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// Turn echo off: the shell takes care of its own echoing.
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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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}
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Machine *m = emul_init();
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m->ramstart = RAMSTART;
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m->iord[STDIO_PORT] = iord_stdio;
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m->iord[FS_DATA_PORT] = iord_fsdata;
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m->iord[FS_ADDR_PORT] = iord_fsaddr;
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m->iowr[STDIO_PORT] = iowr_stdio;
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m->iowr[FS_DATA_PORT] = iowr_fsdata;
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m->iowr[FS_ADDR_PORT] = iowr_fsaddr;
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// initialize memory
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for (int i=0; i<sizeof(KERNEL); i++) {
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m->mem[i] = KERNEL[i];
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}
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// Run!
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running = 1;
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while (running && emul_step());
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if (tty) {
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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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emul_printdebug();
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}
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return 0;
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}
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