110 lines
1.9 KiB
C
110 lines
1.9 KiB
C
#include "../lib/strcmp.h"
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static const char test[] = "Hello\n";
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int strlen(const char *str) {
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const char *s;
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for (s = str; *s; s++)
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;
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return s - str;
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}
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void putc(const char c) {
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asm volatile (
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"movl $1, %%eax\n\t"
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"movl $1, %%edi\n\t"
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"movl %0, %%esi\n\t"
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"movl $1, %%edx\n\t"
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"int $0x80"
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:
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: "r"(&c)
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: "%eax", "%edi", "%esi", "%edx"
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);
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}
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void puts(const char *str) {
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asm volatile (
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"movl $1, %%eax\n\t"
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"movl $1, %%edi\n\t"
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"movl %0, %%esi\n\t"
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"movl %1, %%edx\n\t"
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"int $0x80"
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:
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: "r"(str), "r"(strlen(str))
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: "%eax", "%edi", "%esi", "%edx"
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);
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}
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void read(int fd, void *buf, int size) {
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asm volatile (
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"movl $0, %%eax\n\t"
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"int $0x80"
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:
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: "D"(fd), "d"(size), "S"(buf)
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: "eax"
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);
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}
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void reboot() {
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asm volatile (
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"movl $2, %%eax\n\t"
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"int $0x80"
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:
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:
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: "eax"
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);
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}
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uint64_t uptime() {
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uint32_t low = 0;
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uint32_t high = 0;
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asm volatile (
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"movl $3, %%eax\n\t"
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"movl %0, %%esi\n\t"
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"movl %1, %%edi\n\t"
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"int $0x80"
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:
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: "r" (&low), "r" (&high)
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: "eax", "esi"
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);
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return (uint64_t)low | ((uint64_t)high << 32);
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}
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extern char *buf;
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void print_int(int num){
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if (num < 0)
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{
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putc('-');
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num = -num;
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}
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if (num > 9) print_int(num/10);
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putc(('0'+ (num%10)));
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}
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void _start() {
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char buf1[256] = {0};
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//puts("Welcome to the Hazel user shell!\n");
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puts(test);
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while (1) {
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puts("$ ");
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read(0, buf1, 256);
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if (!strcmp(buf1, "SKIBIDI")) {
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puts("dop dop yes yes!\n");
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} else if (!strcmp(buf1, "REBOOT")) {
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reboot();
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} else if (!strcmp(buf1, "UPTIME")) {
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uint64_t ticks = uptime();
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print_int(ticks);
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puts("\n");
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}
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else {
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puts("unknown command!\n");
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}
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}
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}
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