64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include "fat12.h"
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#define kPolmonAddress ((void*)0x0600)
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#define kFatAddress ((void*)0x1000)
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#define kRootDirAddress ((void*)0x1200)
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static int putchar(int c) {
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register uint8_t khar asm ("al") = c;
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register uint8_t func asm ("ah") = 0x0e;
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register uint8_t page asm ("bh") = 0;
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asm volatile ("int $0x10"
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:: "r" (khar), "r" (func), "r" (page)
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: "bp");
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return c;
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}
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static int puts(const char* msg) {
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while (*msg) {
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putchar(*msg++);
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}
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return 0;
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}
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__attribute__((noreturn))
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static void die(const char* msg) {
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puts(msg);
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while (1) {
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}
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__builtin_unreachable();
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}
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__attribute__((noreturn))
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static void jump(void* addr) {
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asm volatile ("ljmp $0,%0" :: "i"(addr));
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__builtin_unreachable();
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}
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__attribute__((noreturn))
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static void loadpolmon() {
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if (fat12_init(kFatAddress, kRootDirAddress)) {
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die("fi");
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}
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while (fat12_readfile("POLIO COM", kPolmonAddress)) {
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asm volatile (
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"mov $00, %%ah \n\t"
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"int $0x16 \n\t"
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::: "ax"
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);
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}
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jump(kPolmonAddress);
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}
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int main() {
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loadpolmon();
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}
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