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efi/arm64: Check for h/w support before booting a >4 KB granular kernel

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A kernel built with support for a page size that is not supported by the
hardware it runs on cannot boot to a state where it can inform the user
about the failure.

If we happen to be booting via UEFI, we can fail gracefully so check
if the currently configured page size is supported by the hardware before
entering the kernel proper. Note that UEFI mandates support for 4 KB pages,
so in that case, no check is needed.

Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1455712566-16727-10-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ard Biesheuvel 2016-02-17 12:36:02 +00:00 committed by Ingo Molnar
parent 2ec0f0a3a4
commit 42b5573403
1 changed files with 20 additions and 0 deletions
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20
drivers/firmware/efi/libstub/arm64-stub.c
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@ -12,6 +12,26 @@
#include <linux/efi.h> #include <linux/efi.h>
#include <asm/efi.h> #include <asm/efi.h>
#include <asm/sections.h> #include <asm/sections.h>
#include <asm/sysreg.h>
efi_status_t check_platform_features(efi_system_table_t *sys_table_arg)
{
u64 tg;
/* UEFI mandates support for 4 KB granularity, no need to check */
if (IS_ENABLED(CONFIG_ARM64_4K_PAGES))
return EFI_SUCCESS;
tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_TGRAN_SHIFT) & 0xf;
if (tg != ID_AA64MMFR0_TGRAN_SUPPORTED) {
if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
pr_efi_err(sys_table_arg, "This 64 KB granular kernel is not supported by your CPU\n");
else
pr_efi_err(sys_table_arg, "This 16 KB granular kernel is not supported by your CPU\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
efi_status_t handle_kernel_image(efi_system_table_t *sys_table_arg, efi_status_t handle_kernel_image(efi_system_table_t *sys_table_arg,
unsigned long *image_addr, unsigned long *image_addr,