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| author | Ard Biesheuvel <ardb@kernel.org> | 2020-03-27 16:09:40 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-04-24 14:52:16 +0200 |
| commit | 43b1df0e013c25abb536699f46d0e9f291b586a0 (patch) | |
| tree | cc2415ae3b79cb9494824ba9a5ce1e7a25e39d5c /drivers/firmware/efi/libstub/mem.c | |
| parent | efi/libstub/arm64: Simplify randomized loading of kernel image (diff) | |
| download | linux-43b1df0e013c25abb536699f46d0e9f291b586a0.tar.xz linux-43b1df0e013c25abb536699f46d0e9f291b586a0.zip | |
efi/libstub: Add API function to allocate aligned memory
Break out the code to create an aligned page allocation from mem.c
and move it into a function efi_allocate_pages_aligned() in alignedmem.c.
Update efi_allocate_pages() to invoke it unless the minimum alignment
equals the EFI page size (4 KB), in which case the ordinary page
allocator is sufficient. This way, efi_allocate_pages_aligned() will
only be pulled into the build if it is actually being used (which will
be on arm64 only in the immediate future)
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/libstub/mem.c')
| -rw-r--r-- | drivers/firmware/efi/libstub/mem.c | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c index 869a79c8946f..0020b0fa9587 100644 --- a/drivers/firmware/efi/libstub/mem.c +++ b/drivers/firmware/efi/libstub/mem.c @@ -93,31 +93,24 @@ fail: efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr, unsigned long max) { - efi_physical_addr_t alloc_addr = ALIGN_DOWN(max + 1, EFI_ALLOC_ALIGN) - 1; - int slack = EFI_ALLOC_ALIGN / EFI_PAGE_SIZE - 1; + efi_physical_addr_t alloc_addr; efi_status_t status; - size = round_up(size, EFI_ALLOC_ALIGN); + if (EFI_ALLOC_ALIGN > EFI_PAGE_SIZE) + return efi_allocate_pages_aligned(size, addr, max, + EFI_ALLOC_ALIGN); + + alloc_addr = ALIGN_DOWN(max + 1, EFI_ALLOC_ALIGN) - 1; status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS, - EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack, + EFI_LOADER_DATA, DIV_ROUND_UP(size, EFI_PAGE_SIZE), &alloc_addr); if (status != EFI_SUCCESS) return status; - *addr = ALIGN((unsigned long)alloc_addr, EFI_ALLOC_ALIGN); - - if (slack > 0) { - int l = (alloc_addr % EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; - - if (l) { - efi_bs_call(free_pages, alloc_addr, slack - l + 1); - slack = l - 1; - } - if (slack) - efi_bs_call(free_pages, *addr + size, slack); - } + *addr = alloc_addr; return EFI_SUCCESS; } + /** * efi_low_alloc_above() - allocate pages at or above given address * @size: size of the memory area to allocate |