diff options
| author | Joey Gouly <joey.gouly@arm.com> | 2023-06-06 15:58:54 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2023-06-06 16:52:41 +0100 |
| commit | eeda243dfeb996fe236c624796630c16237a18d6 (patch) | |
| tree | 03c6e1643dcd961fc8a9d2f7c6d6aa530efc7f9b /arch/arm64/include/asm/pgtable-hwdef.h | |
| parent | 7df7170965a28c61f80a57b655b0cc10adb88ab9 (diff) | |
arm64: add encodings of PIRx_ELx registers
The encodings used in the permission indirection registers means that the
values that Linux puts in the PTEs do not need to be changed.
The E0 values are replicated in E1, with the execute permissions removed.
This is needed as the futex operations access user mappings with privileged
loads/stores.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20230606145859.697944-16-joey.gouly@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/pgtable-hwdef.h')
| -rw-r--r-- | arch/arm64/include/asm/pgtable-hwdef.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h index f658aafc47df..e4944d517c99 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -171,6 +171,14 @@ #define PTE_ATTRINDX_MASK (_AT(pteval_t, 7) << 2) /* + * PIIndex[3:0] encoding (Permission Indirection Extension) + */ +#define PTE_PI_IDX_0 6 /* AP[1], USER */ +#define PTE_PI_IDX_1 51 /* DBM */ +#define PTE_PI_IDX_2 53 /* PXN */ +#define PTE_PI_IDX_3 54 /* UXN */ + +/* * Memory Attribute override for Stage-2 (MemAttr[3:0]) */ #define PTE_S2_MEMATTR(t) (_AT(pteval_t, (t)) << 2) |