103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
|
#include <stdint.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <termios.h>
|
||
|
|
#include "libz80/z80.h"
|
||
|
|
#include "shell-kernel.h"
|
||
|
|
|
||
|
|
/* Collapse OS vanilla shell
|
||
|
|
*
|
||
|
|
* Memory layout:
|
||
|
|
*
|
||
|
|
* 0x0000 - 0x3fff: ROM code from shell.asm
|
||
|
|
* 0x4000 - 0x4fff: Kernel memory
|
||
|
|
* 0x5000 - 0xffff: Userspace
|
||
|
|
*
|
||
|
|
* I/O Ports:
|
||
|
|
*
|
||
|
|
* 0 - stdin / stdout
|
||
|
|
*/
|
||
|
|
|
||
|
|
// in sync with shell.asm
|
||
|
|
#define RAMSTART 0x4000
|
||
|
|
#define STDIO_PORT 0x00
|
||
|
|
#define STDIN_ST_PORT 0x01
|
||
|
|
|
||
|
|
static Z80Context cpu;
|
||
|
|
static uint8_t mem[0xffff];
|
||
|
|
static int running;
|
||
|
|
|
||
|
|
static uint8_t io_read(int unused, uint16_t addr)
|
||
|
|
{
|
||
|
|
addr &= 0xff;
|
||
|
|
if (addr == STDIO_PORT) {
|
||
|
|
uint8_t c = getchar();
|
||
|
|
if (c == EOF) {
|
||
|
|
running = 0;
|
||
|
|
}
|
||
|
|
return c;
|
||
|
|
} else {
|
||
|
|
fprintf(stderr, "Out of bounds I/O read: %d\n", addr);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void io_write(int unused, uint16_t addr, uint8_t val)
|
||
|
|
{
|
||
|
|
addr &= 0xff;
|
||
|
|
if (addr == STDIO_PORT) {
|
||
|
|
if (val == 0x04) { // CTRL+D
|
||
|
|
running = 0;
|
||
|
|
} else {
|
||
|
|
putchar(val);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
fprintf(stderr, "Out of bounds I/O write: %d / %d\n", addr, val);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static uint8_t mem_read(int unused, uint16_t addr)
|
||
|
|
{
|
||
|
|
return mem[addr];
|
||
|
|
}
|
||
|
|
|
||
|
|
static void mem_write(int unused, uint16_t addr, uint8_t val)
|
||
|
|
{
|
||
|
|
mem[addr] = val;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
// Turn echo off: the shell takes care of its own echoing.
|
||
|
|
struct termios termInfo;
|
||
|
|
if (tcgetattr(0, &termInfo) == -1) {
|
||
|
|
printf("Can't setup terminal.\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
termInfo.c_lflag &= ~ECHO;
|
||
|
|
termInfo.c_lflag &= ~ICANON;
|
||
|
|
tcsetattr(0, TCSAFLUSH, &termInfo);
|
||
|
|
|
||
|
|
|
||
|
|
// initialize memory
|
||
|
|
for (int i=0; i<sizeof(SHELL_KERNEL); i++) {
|
||
|
|
mem[i] = SHELL_KERNEL[i];
|
||
|
|
}
|
||
|
|
// Run!
|
||
|
|
running = 1;
|
||
|
|
Z80RESET(&cpu);
|
||
|
|
cpu.ioRead = io_read;
|
||
|
|
cpu.ioWrite = io_write;
|
||
|
|
cpu.memRead = mem_read;
|
||
|
|
cpu.memWrite = mem_write;
|
||
|
|
|
||
|
|
while (running) {
|
||
|
|
Z80Execute(&cpu);
|
||
|
|
}
|
||
|
|
|
||
|
|
printf("Done!\n");
|
||
|
|
termInfo.c_lflag |= ECHO;
|
||
|
|
termInfo.c_lflag |= ICANON;
|
||
|
|
tcsetattr(0, TCSAFLUSH, &termInfo);
|
||
|
|
return 0;
|
||
|
|
}
|