Commit 07a1b97d authored by Leif Lindholm's avatar Leif Lindholm Committed by Colin Watson

efi: Add central copy of grub_efi_find_mmap_size

There are several implementations of this function in the tree.
Add a central version in grub-core/efi/mm.c.
Signed-off-by: 's avatarLeif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: 's avatarDaniel Kiper <daniel.kiper@oracle.com>

Origin: upstream, https://git.savannah.gnu.org/cgit/grub.git/commit/?id=8ec18d1a4c26129c0a018ee7a61739a929ee1a25
Bug-Debian: https://bugs.debian.org/907596
Bug-Debian: https://bugs.debian.org/909420
Last-Update: 2018-12-06

Patch-Name: efi-add-central-copy-of-grub_efi_find_mmap_size.patch
parent 32807730
......@@ -250,6 +250,30 @@ grub_efi_finish_boot_services (grub_efi_uintn_t *outbuf_size, void *outbuf,
return GRUB_ERR_NONE;
}
/*
* To obtain the UEFI memory map, we must pass a buffer of sufficient size
* to hold the entire map. This function returns a sane start value for
* buffer size.
*/
grub_efi_uintn_t
grub_efi_find_mmap_size (void)
{
grub_efi_uintn_t mmap_size = 0;
grub_efi_uintn_t desc_size;
if (grub_efi_get_memory_map (&mmap_size, NULL, NULL, &desc_size, 0) < 0)
{
grub_error (GRUB_ERR_IO, "cannot get EFI memory map size");
return 0;
}
/*
* Add an extra page, since UEFI can alter the memory map itself on
* callbacks or explicit calls, including console output.
*/
return ALIGN_UP (mmap_size + GRUB_EFI_PAGE_SIZE, GRUB_EFI_PAGE_SIZE);
}
/* Get the memory map as defined in the EFI spec. Return 1 if successful,
return 0 if partial, or return -1 if an error occurs. */
int
......
......@@ -52,6 +52,7 @@ EXPORT_FUNC(grub_efi_allocate_pages_max) (grub_efi_physical_address_t max,
grub_efi_uintn_t pages);
void EXPORT_FUNC(grub_efi_free_pages) (grub_efi_physical_address_t address,
grub_efi_uintn_t pages);
grub_efi_uintn_t EXPORT_FUNC(grub_efi_find_mmap_size) (void);
int
EXPORT_FUNC(grub_efi_get_memory_map) (grub_efi_uintn_t *memory_map_size,
grub_efi_memory_descriptor_t *memory_map,
......
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