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#include <lib.h>
#include <comus/mboot.h>
#include "mboot.h"
static volatile void *mboot = NULL;
extern char kernel_end[];
void mboot_init(long magic, volatile void *ptr)
{
if (magic != MULTIBOOT2_BOOTLOADER_MAGIC)
panic("invalid multiboot magic: %#08lx", magic);
mboot = ptr;
}
void *mboot_end(void)
{
if (mboot == NULL)
return NULL;
struct multiboot *info = (struct multiboot *)mboot;
uintptr_t mboot_end, initrd_end;
size_t initrd_len;
mboot_end = (uintptr_t)info + info->total_size;
initrd_end = (uintptr_t)mboot_get_initrd_phys(&initrd_len);
if (initrd_end)
initrd_end += initrd_len;
return (void *)MAX(mboot_end, initrd_end);
}
void *locate_mboot_table(uint32_t type)
{
if (mboot == NULL)
return NULL;
struct multiboot *info = (struct multiboot *)mboot;
const char *mboot_end = ((char *)info) + info->total_size;
char *tag_ptr = info->tags;
while (tag_ptr < mboot_end) {
struct multiboot_tag *tag = (struct multiboot_tag *)tag_ptr;
if (tag->type == type)
return tag;
// goto next
int size = tag->size;
if (size % 8 != 0) {
size += 8 - (size % 8);
}
tag_ptr += size;
}
return NULL;
}
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