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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-04-04 19:02:37 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-04-05 13:27:23 +0300 |
| commit | 138728dd4ee30d3f35587c269c46cc829ec4d58b (patch) | |
| tree | 33b88fbbc93e97fd5096ee9bef23a316a6ddb922 /drivers/firmware/efi/libstub | |
| parent | 55d728a40d368ba80443be85c02e641fc9082a3f (diff) | |
| download | linux-138728dd4ee30d3f35587c269c46cc829ec4d58b.tar.xz | |
efi/arm-stub: Correct FDT and initrd allocation rules for arm64
On arm64, we have made some changes over the past year to the way the
kernel itself is allocated and to how it deals with the initrd and FDT.
This patch brings the allocation logic in the EFI stub in line with that,
which is necessary because the introduction of KASLR has created the
possibility for the initrd to be allocated in a place where the kernel
may not be able to map it. (This is mostly a theoretical scenario, since
it only affects systems where the physical memory footprint exceeds the
size of the linear mapping.)
Since we know the kernel itself will be covered by the linear mapping,
choose a suitably sized window (i.e., based on the size of the linear
region) covering the kernel when allocating memory for the initrd.
The FDT may be anywhere in memory on arm64 now that we map it via the
fixmap, so we can lift the address restriction there completely.
Tested-by: Richard Ruigrok <rruigrok@codeaurora.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170404160245.27812-4-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/libstub')
| -rw-r--r-- | drivers/firmware/efi/libstub/arm-stub.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c index d4056c6be1ec..02049ff25c6b 100644 --- a/drivers/firmware/efi/libstub/arm-stub.c +++ b/drivers/firmware/efi/libstub/arm-stub.c @@ -213,8 +213,9 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table, if (!fdt_addr) pr_efi(sys_table, "Generating empty DTB\n"); - status = handle_cmdline_files(sys_table, image, cmdline_ptr, - "initrd=", dram_base + SZ_512M, + status = handle_cmdline_files(sys_table, image, cmdline_ptr, "initrd=", + efi_get_max_initrd_addr(dram_base, + *image_addr), (unsigned long *)&initrd_addr, (unsigned long *)&initrd_size); if (status != EFI_SUCCESS) @@ -224,7 +225,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table, new_fdt_addr = fdt_addr; status = allocate_new_fdt_and_exit_boot(sys_table, handle, - &new_fdt_addr, dram_base + MAX_FDT_OFFSET, + &new_fdt_addr, efi_get_max_fdt_addr(dram_base), initrd_addr, initrd_size, cmdline_ptr, fdt_addr, fdt_size); |