45 lines
823 B
C
45 lines
823 B
C
#if defined (BIOS)
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#include <stdint.h>
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#include <stddef.h>
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#include <sys/e820.h>
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#include <lib/real.h>
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#include <lib/misc.h>
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#include <lib/print.h>
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#include <mm/pmm.h>
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#define MAX_E820_ENTRIES 256
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struct memmap_entry e820_map[MAX_E820_ENTRIES];
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size_t e820_entries = 0;
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void init_e820(void) {
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struct rm_regs r = {0};
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for (size_t i = 0; i < MAX_E820_ENTRIES; i++) {
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struct memmap_entry entry;
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r.eax = 0xe820;
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r.ecx = 24;
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r.edx = 0x534d4150;
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r.edi = (uint32_t)&entry;
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rm_int(0x15, &r, &r);
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if (r.eflags & EFLAGS_CF) {
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e820_entries = i;
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return;
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}
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e820_map[i] = entry;
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if (!r.ebx) {
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e820_entries = ++i;
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return;
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}
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}
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panic(false, "Too many E820 entries!");
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}
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#endif
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