UEFI Support

UEFI stub library functions

efi_status_t efi_get_memory_map(struct efi_boot_memmap *map)

get memory map

Parameters

struct efi_boot_memmap * map

on return pointer to memory map

Description

Retrieve the UEFI memory map. The allocated memory leaves room for up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries.

Return

status code

efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr, unsigned long max)

Allocate memory pages

Parameters

unsigned long size

minimum number of bytes to allocate

unsigned long * addr

On return the address of the first allocated page. The first allocated page has alignment EFI_ALLOC_ALIGN which is an architecture dependent multiple of the page size.

unsigned long max

the address that the last allocated memory page shall not exceed

Description

Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according to EFI_ALLOC_ALIGN. The last allocated page will not exceed the address given by max.

Return

status code

void efi_free(unsigned long size, unsigned long addr)

free memory pages

Parameters

unsigned long size

size of the memory area to free in bytes

unsigned long addr

start of the memory area to free (must be EFI_PAGE_SIZE aligned)

Description

size is rounded up to a multiple of EFI_ALLOC_ALIGN which is an architecture specific multiple of EFI_PAGE_SIZE. So this function should only be used to return pages allocated with efi_allocate_pages() or efi_low_alloc_above().