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Printing int/hex values, yayyyy! (videomode number)

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Jarkko Toivanen 2023-06-14 06:19:50 +03:00
parent 7d576d3cd5
commit f1b11875d7
Signed by: jt
GPG key ID: 9151B109B73ECAD5
1 changed files with 35 additions and 5 deletions
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40
kernel.c
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@ -1,9 +1,37 @@
#include "multiboot.h" #include "multiboot.h"
#include "vga.h" #include "vga.h"
// static inline void outb(unsigned int port, unsigned char val) { /*
// asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port) : "memory"); static inline void outb(unsigned int port, unsigned char val) {
// } asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port) : "memory");
}
*/
char* itoa(int value, int base) {
char* result;
// check that the base if valid
if (base < 2 || base > 36) { *result = '\0'; return result; }
char* ptr = result, *ptr1 = result, tmp_char;
int tmp_value;
do {
tmp_value = value;
value /= base;
*ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - value * base)];
} while ( value );
// Apply negative sign
if (tmp_value < 0) *ptr++ = '-';
*ptr-- = '\0';
while(ptr1 < ptr) {
tmp_char = *ptr;
*ptr--= *ptr1;
*ptr1++ = tmp_char;
}
return result;
}
void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) { void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
@ -23,10 +51,12 @@ void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
vga_write_color("INVALID MAGIC", VGA_COLOR_BLACK, VGA_COLOR_RED); vga_write_color("INVALID MAGIC", VGA_COLOR_BLACK, VGA_COLOR_RED);
return; return;
} }
vga_write(mbootinfo->boot_loader_name); vga_write((char *)mbootinfo->boot_loader_name);
// Check videomode // Check videomode
vga_write("\nVideomode: "); vga_write("\nVideomode: 0x");
vga_write(itoa(mbootinfo->vbe_mode, 16));
vga_write(": ");
switch (mbootinfo->vbe_mode) { switch (mbootinfo->vbe_mode) {
case MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED: case MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED:
vga_write("Indexed"); vga_write("Indexed");