diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2014-07-16 17:42:43 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-07-23 15:28:05 +0100 |
| commit | 08375198b01001c0e43bdd580104b16b019a3754 (patch) | |
| tree | 42fcb4cd3d1660d4fcdc2c44a6ce8d5982e220e8 /arch/arm64/include/asm/pgtable.h | |
| parent | b4a0d8b37797663b0e523c102dbb3e4b712a720c (diff) | |
arm64: Determine the vmalloc/vmemmap space at build time based on VA_BITS
Rather than guessing what the maximum vmmemap space should be, this
patch allows the calculation based on the VA_BITS and sizeof(struct
page). The vmalloc space extends to the beginning of the vmemmap space.
Since the virtual kernel memory layout now depends on the build
configuration, this patch removes the detailed description in
Documentation/arm64/memory.txt in favour of information printed during
kernel booting.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Jungseok Lee <jungseoklee85@gmail.com>
Diffstat (limited to 'arch/arm64/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 9f862e6e9286..ec82789d03c3 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -33,13 +33,16 @@ /* * VMALLOC and SPARSEMEM_VMEMMAP ranges. + * + * VMEMAP_SIZE: allows the whole VA space to be covered by a struct page array + * (rounded up to PUD_SIZE). + * VMALLOC_START: beginning of the kernel VA space + * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space, + * fixed mappings and modules */ +#define VMEMMAP_SIZE ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE) #define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS) -#if CONFIG_ARM64_PGTABLE_LEVELS != 4 -#define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K) -#else -#define VMALLOC_END (PAGE_OFFSET - UL(0x40000000000) - SZ_64K) -#endif +#define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K) #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) |