112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <lib/libc.h>
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#include <lib/blib.h>
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#include <lib/print.h>
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#include <lib/trace.h>
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uint8_t boot_drive;
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bool parse_resolution(int *width, int *height, int *bpp, const char *buf) {
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int res[3] = {0};
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const char *first = buf;
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for (int i = 0; i < 3; i++) {
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const char *last;
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int x = strtoui(first, &last, 10);
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if (first == last)
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break;
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res[i] = x;
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if (*last == 0)
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break;
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first = last + 1;
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}
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if (res[0] == 0 || res[1] == 0)
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return false;
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if (res[2] == 0)
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res[2] = 32;
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*width = res[0], *height = res[1], *bpp = res[2];
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return true;
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}
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// This integer sqrt implementation has been adapted from:
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// https://stackoverflow.com/questions/1100090/looking-for-an-efficient-integer-square-root-algorithm-for-arm-thumb2
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uint64_t sqrt(uint64_t a_nInput) {
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uint64_t op = a_nInput;
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uint64_t res = 0;
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uint64_t one = (uint64_t)1 << 62;
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// "one" starts at the highest power of four <= than the argument.
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while (one > op) {
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one >>= 2;
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}
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while (one != 0) {
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if (op >= res + one) {
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op = op - (res + one);
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res = res + 2 * one;
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}
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res >>= 1;
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one >>= 2;
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}
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return res;
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}
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uint8_t bcd_to_int(uint8_t val) {
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return (val & 0x0f) + ((val & 0xf0) >> 4) * 10;
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}
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__attribute__((noreturn)) void panic(const char *fmt, ...) {
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asm volatile ("cli" ::: "memory");
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va_list args;
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va_start(args, fmt);
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print("\033[31mPANIC\033[37;1m\033[40m: ");
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vprint(fmt, args);
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va_end(args);
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print("\n");
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print_stacktrace(NULL);
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for (;;) {
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asm volatile ("hlt" ::: "memory");
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}
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}
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int digit_to_int(char c) {
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if (c >= 'a' && c <= 'f') {
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return (c - 'a') + 10;
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}
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if (c >= 'A' && c <= 'F') {
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return (c - 'A') + 10;
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}
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if (c >= '0' && c <= '9'){
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return c - '0';
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}
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return -1;
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}
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uint64_t strtoui(const char *s, const char **end, int base) {
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uint64_t n = 0;
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for (size_t i = 0; ; i++) {
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int d = digit_to_int(s[i]);
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if (d == -1) {
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if (end != NULL)
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*end = &s[i];
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break;
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}
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n = n * base + d;
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}
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return n;
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}
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