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#include <lib.h>
#include <comus/mboot.h>
#include "mboot.h"
#define MULTIBOOT_TAG_TYPE_MMAP 6
#define MULTIBOOT_SEG_TYPE_RESV 0
#define MULTIBOOT_SEG_TYPE_FREE 1
#define MULTIBOOT_SEG_TYPE_ACPI 3
#define MULTIBOOT_SEG_TYPE_HIBR 4
#define MULTIBOOT_SEG_TYPE_DEFC 5
struct multiboot_mmap_entry {
uint64_t addr;
uint64_t len;
uint32_t type;
uint32_t zero;
};
struct multiboot_tag_mmap {
uint32_t type;
uint32_t size;
uint32_t entry_size;
uint32_t entry_version;
struct multiboot_mmap_entry entries[];
};
int mboot_get_mmap(struct memory_map *res)
{
void *tag = locate_mboot_table(MULTIBOOT_TAG_TYPE_MMAP);
if (tag == NULL)
return 1;
struct multiboot_tag_mmap *mmap = (struct multiboot_tag_mmap *)tag;
int idx = 0;
uintptr_t i = (uintptr_t)mmap->entries;
for (; i < (uintptr_t)mmap->entries + mmap->size; i += mmap->entry_size) {
if (idx >= N_MMAP_ENTRY)
panic("Too many mmap entries: limit is %d", N_MMAP_ENTRY);
struct multiboot_mmap_entry *seg = (struct multiboot_mmap_entry *)i;
res->entries[idx].addr = seg->addr;
res->entries[idx].len = seg->len;
switch (seg->type) {
case MULTIBOOT_SEG_TYPE_RESV:
res->entries[idx].type = SEG_TYPE_RESERVED;
break;
case MULTIBOOT_SEG_TYPE_FREE:
res->entries[idx].type = SEG_TYPE_FREE;
break;
case MULTIBOOT_SEG_TYPE_ACPI:
res->entries[idx].type = SEG_TYPE_ACPI;
break;
case MULTIBOOT_SEG_TYPE_HIBR:
res->entries[idx].type = SEG_TYPE_HIBERNATION;
break;
case MULTIBOOT_SEG_TYPE_DEFC:
res->entries[idx].type = SEG_TYPE_DEFECTIVE;
break;
default:
continue;
}
idx++;
}
res->entry_count = idx;
return 0;
}
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