mirror of
https://github.com/gbowne1/ClassicOS.git
synced 2026-02-11 21:35:20 -08:00
4fa82854dd
- bl stage 1: move gdt+pm setup to stage 2 (avoids mode switching) - bl stage 2: at entry query e820 table from bios, then setup gdt+pm - kernel/memmap: pad map entry to 24 bytes, as exported by bl - kernel/memmap: map copy (gbowne1) - Makefile: facilitate placing the memory map at a known location - Update bl docs
19 lines
582 B
C
19 lines
582 B
C
#include "memmap.h"
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#define BOOTLOADER_MEMMAP_COUNT_ADDR MEMMAP_BASE
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#define BOOTLOADER_MEMMAP_ADDR (MEMMAP_BASE + 4)
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uint32_t get_memory_map(memory_map_entry_t *map, uint32_t max_entries) {
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// Read the number of entries found by the bootloader
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uint32_t entries_found = *(uint32_t*)BOOTLOADER_MEMMAP_COUNT_ADDR;
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memory_map_entry_t *bios_data = (memory_map_entry_t*)BOOTLOADER_MEMMAP_ADDR;
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uint32_t count = 0;
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while (count < entries_found && count < max_entries) {
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map[count] = bios_data[count];
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count++;
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}
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return count;
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}
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