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| author |   Catalin Marinas <catalin.marinas@arm.com> | 2013-10-23 16:50:07 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-11-05 17:23:52 +0000 |
| commit | 847264fb7e73ade5b5e4b6eea3daa243a1f5217e (patch) | |
| tree | 3688d8bf1cd8f06e8bff978922d14c79406f5ce8 /arch/arm64/include/asm/memory.h | |
| parent | arm64: module: ensure instruction is little-endian before manipulation (diff) | |
| download | linux-dev-847264fb7e73ade5b5e4b6eea3daa243a1f5217e.tar.xz linux-dev-847264fb7e73ade5b5e4b6eea3daa243a1f5217e.zip | |
arm64: Use 42-bit address space with 64K pages
This patch expands the VA_BITS to 42 when the 64K page configuration is
enabled allowing 2TB kernel linear mapping. Linux still uses 2 levels of
page tables in this configuration with pgd now being a full page.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/memory.h')
| -rw-r--r-- | arch/arm64/include/asm/memory.h | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 20925bcf4e2a..37762175896f 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -33,18 +33,23 @@ #define UL(x) _AC(x, UL) /* - * PAGE_OFFSET - the virtual address of the start of the kernel image. + * PAGE_OFFSET - the virtual address of the start of the kernel image (top + * (VA_BITS - 1)) * VA_BITS - the maximum number of bits for virtual addresses. * TASK_SIZE - the maximum size of a user space task. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. * The module space lives between the addresses given by TASK_SIZE * and PAGE_OFFSET - it must be within 128MB of the kernel text. */ -#define PAGE_OFFSET UL(0xffffffc000000000) +#ifdef CONFIG_ARM64_64K_PAGES +#define VA_BITS (42) +#else +#define VA_BITS (39) +#endif +#define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1)) #define MODULES_END (PAGE_OFFSET) #define MODULES_VADDR (MODULES_END - SZ_64M) #define EARLYCON_IOBASE (MODULES_VADDR - SZ_4M) -#define VA_BITS (39) #define TASK_SIZE_64 (UL(1) << VA_BITS) #ifdef CONFIG_COMPAT |