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author | 2022-11-07 19:47:53 +0530 | |
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committer | 2022-11-09 18:13:18 +0000 | |
commit | a4ee28615c7a1e2925e1fcb4ba0fa1aeee633d78 (patch) | |
tree | 3c4e5db235c93b63d0eebd8f43a6bd3590e0cd06 /arch/arm64/include/asm/pgtable-hwdef.h | |
parent | Linux 6.1-rc4 (diff) | |
download | linux-a4ee28615c7a1e2925e1fcb4ba0fa1aeee633d78.tar.gz linux-a4ee28615c7a1e2925e1fcb4ba0fa1aeee633d78.tar.bz2 linux-a4ee28615c7a1e2925e1fcb4ba0fa1aeee633d78.zip |
arm64/mm: Simplify and document pte_to_phys() for 52 bit addresses
pte_to_phys() assembly definition does multiple bits field transformations
to derive physical address, embedded inside a page table entry. Unlike its
C counter part i.e __pte_to_phys(), pte_to_phys() is not very apparent. It
simplifies these operations via a new macro PTE_ADDR_HIGH_SHIFT indicating
how far the pte encoded higher address bits need to be left shifted. While
here, this also updates __pte_to_phys() and __phys_to_pte_val().
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20221107141753.2938621-1-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/pgtable-hwdef.h')
-rw-r--r-- | arch/arm64/include/asm/pgtable-hwdef.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h index 5ab8d163198f..f658aafc47df 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -159,6 +159,7 @@ #ifdef CONFIG_ARM64_PA_BITS_52 #define PTE_ADDR_HIGH (_AT(pteval_t, 0xf) << 12) #define PTE_ADDR_MASK (PTE_ADDR_LOW | PTE_ADDR_HIGH) +#define PTE_ADDR_HIGH_SHIFT 36 #else #define PTE_ADDR_MASK PTE_ADDR_LOW #endif |