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https://github.com/hsoft/collapseos.git
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127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "emul.h"
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#ifdef STAGE2
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#include "forth1-bin.h"
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#include "blkfs-bin.h"
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#else
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#include "forth0-bin.h"
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#endif
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/* Staging binaries
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The role of a stage executable is to compile definitions in a dictionary and
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then spit the difference between the starting binary and the new binary.
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That binary can then be grafted to an exiting Forth binary to augment its
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dictionary.
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We could, if we wanted, run only with the bootstrap binary and compile core
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defs at runtime, but that would mean that those defs live in RAM. In may system,
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RAM is much more constrained than ROM, so it's worth it to give ourselves the
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trouble of compiling defs to binary.
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*/
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// When DEBUG is set, stage1 is a core-less forth that works interactively.
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// Useful for... debugging!
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// By the way: there's a double-echo in stagedbg. It's normal. Don't panic.
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//#define DEBUG
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// in sync with glue.asm
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#define RAMSTART 0x840
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#define STDIO_PORT 0x00
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// To know which part of RAM to dump, we listen to port 2, which at the end of
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// its compilation process, spits its HERE addr to port 2 (MSB first)
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#define HERE_PORT 0x02
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// Port for block reads. Write 2 bytes, MSB first, on that port and then
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// read 1024 bytes from the DATA port.
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#define BLK_PORT 0x03
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#define BLKDATA_PORT 0x04
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static int running;
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// We support double-pokes, that is, a first poke to tell where to start the
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// dump and a second one to tell where to stop. If there is only one poke, it's
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// then ending HERE and we start at sizeof(KERNEL).
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static uint16_t start_here = 0;
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static uint16_t end_here = 0;
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static uint16_t blkid = 0;
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static unsigned int blkpos = 0;
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static uint8_t iord_stdio()
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{
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int c = getc(stdin);
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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 void iowr_stdio(uint8_t val)
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{
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// we don't output stdout in stage0
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#ifdef DEBUG
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// ... unless we're in DEBUG mode!
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putchar(val);
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#endif
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}
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static void iowr_here(uint8_t val)
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{
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start_here <<=8;
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start_here |= (end_here >> 8);
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end_here <<= 8;
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end_here |= val;
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}
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#ifdef STAGE2
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static void iowr_blk(uint8_t val)
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{
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blkid <<= 8;
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blkid |= val;
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blkpos = blkid * 1024;
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}
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static uint8_t iord_blkdata()
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{
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return BLKFS[blkpos++];
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}
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#endif
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int main(int argc, char *argv[])
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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->iowr[STDIO_PORT] = iowr_stdio;
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m->iowr[HERE_PORT] = iowr_here;
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#ifdef STAGE2
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m->iowr[BLK_PORT] = iowr_blk;
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m->iord[BLKDATA_PORT] = iord_blkdata;
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#endif
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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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#ifndef DEBUG
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// We're done, now let's spit dict data
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if (start_here == 0) {
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// No starting offset? Let's use LATEST
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start_here = m->mem[0x08];
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start_here += m->mem[0x09] << 8;
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}
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for (int i=start_here; i<end_here; i++) {
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putchar(m->mem[i]);
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}
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#endif
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return 0;
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}
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