mykola/mbr4ext2
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mykola2312 2024-08-07 15:32:52 +03:00
parent 2658cb74a9
commit cadf502366
2 changed files with 5 additions and 0 deletions
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3
include/mbr.h
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@ -4,6 +4,9 @@
#include <stdint.h> #include <stdint.h>
#include "chs.h" #include "chs.h"
// https://wiki.osdev.org/MBR_(x86)
// https://en.wikipedia.org/wiki/Master_boot_record
typedef struct { typedef struct {
uint8_t attributes; uint8_t attributes;
chs_encoded_t chs_first; chs_encoded_t chs_first;

2
src/chs.c
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@ -7,6 +7,8 @@ void chs_decode(const chs_encoded_t* enc, chs_t* chs)
chs->cylinder = (((uint16_t)enc->b[1]) & 0xC0) << 2 | (uint16_t)enc->b[2]; chs->cylinder = (((uint16_t)enc->b[1]) & 0xC0) << 2 | (uint16_t)enc->b[2];
} }
// https://wiki.osdev.org/LBA
uint32_t chs_to_lba(const chs_conf_t* conf, const chs_t* chs) uint32_t chs_to_lba(const chs_conf_t* conf, const chs_t* chs)
{ {
return (chs->cylinder * conf->num_heads + chs->head) * conf->num_sectors + (chs->sector - 1); return (chs->cylinder * conf->num_heads + chs->head) * conf->num_sectors + (chs->sector - 1);