path: root/drivers/firmware/efi/memmap.c
diff options
authorMatt Fleming <matt@codeblueprint.co.uk>2016-06-22 16:54:00 +0100
committerMatt Fleming <matt@codeblueprint.co.uk>2016-09-09 16:07:47 +0100
commitc45f4da33a297f85435f8dccb26a24852ea01bb9 (patch)
tree3bf0927904747a9b36b57058e1dce31e87f87dab /drivers/firmware/efi/memmap.c
parent60863c0d1a96b740048cc7d94a2d00d6f89ba3d8 (diff)
efi: Add efi_memmap_install() for installing new EFI memory maps
While efi_memmap_init_{early,late}() exist for architecture code to install memory maps from firmware data and for the virtual memory regions respectively, drivers don't care which stage of the boot we're at and just want to swap the existing memmap for a modified one. efi_memmap_install() abstracts the details of how the new memory map should be mapped and the existing one unmapped. Tested-by: Dave Young <dyoung@redhat.com> [kexec/kdump] Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [arm] Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Peter Jones <pjones@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Taku Izumi <izumi.taku@jp.fujitsu.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Diffstat (limited to 'drivers/firmware/efi/memmap.c')
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/firmware/efi/memmap.c b/drivers/firmware/efi/memmap.c
index 2df7238eb44e..cd96086fd851 100644
--- a/drivers/firmware/efi/memmap.c
+++ b/drivers/firmware/efi/memmap.c
@@ -140,6 +140,31 @@ int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size)
+ * efi_memmap_install - Install a new EFI memory map in efi.memmap
+ * @addr: Physical address of the memory map
+ * @nr_map: Number of entries in the memory map
+ *
+ * Unlike efi_memmap_init_*(), this function does not allow the caller
+ * to switch from early to late mappings. It simply uses the existing
+ * mapping function and installs the new memmap.
+ *
+ * Returns zero on success, a negative error code on failure.
+ */
+int __init efi_memmap_install(phys_addr_t addr, unsigned int nr_map)
+ struct efi_memory_map_data data;
+ efi_memmap_unmap();
+ data.phys_map = addr;
+ data.size = efi.memmap.desc_size * nr_map;
+ data.desc_version = efi.memmap.desc_version;
+ data.desc_size = efi.memmap.desc_size;
+ return __efi_memmap_init(&data, efi.memmap.late);
* efi_memmap_split_count - Count number of additional EFI memmap entries
* @md: EFI memory descriptor to split
* @range: Address range (start, end) to split around