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| author | Catalin Marinas <catalin.marinas@arm.com> | 2013-10-23 15:50:07 (GMT) |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-11-05 17:23:52 (GMT) |
| commit | 847264fb7e73ade5b5e4b6eea3daa243a1f5217e (patch) | |
| tree | 3688d8bf1cd8f06e8bff978922d14c79406f5ce8 /Documentation | |
| parent | 122e2fa0d310d262cb85cf0b003032e5d2bc2ae7 (diff) | |
| download | linux-847264fb7e73ade5b5e4b6eea3daa243a1f5217e.tar.xz | |
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 'Documentation')
| -rw-r--r-- | Documentation/arm64/memory.txt | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt index f28899d..5e054bf 100644 --- a/Documentation/arm64/memory.txt +++ b/Documentation/arm64/memory.txt @@ -21,7 +21,7 @@ The swapper_pgd_dir address is written to TTBR1 and never written to TTBR0. -AArch64 Linux memory layout: +AArch64 Linux memory layout with 4KB pages: Start End Size Use ----------------------------------------------------------------------- @@ -46,6 +46,31 @@ ffffffbffc000000 ffffffbfffffffff 64MB modules ffffffc000000000 ffffffffffffffff 256GB kernel logical memory map +AArch64 Linux memory layout with 64KB pages: + +Start End Size Use +----------------------------------------------------------------------- +0000000000000000 000003ffffffffff 4TB user + +fffffc0000000000 fffffdfbfffeffff ~2TB vmalloc + +fffffdfbffff0000 fffffdfbffffffff 64KB [guard page] + +fffffdfc00000000 fffffdfdffffffff 8GB vmemmap + +fffffdfe00000000 fffffdfffbbfffff ~8GB [guard, future vmmemap] + +fffffdfffbc00000 fffffdfffbdfffff 2MB earlyprintk device + +fffffdfffbe00000 fffffdfffbe0ffff 64KB PCI I/O space + +fffffdfffbe10000 fffffdfffbffffff ~2MB [guard] + +fffffdfffc000000 fffffdffffffffff 64MB modules + +fffffe0000000000 ffffffffffffffff 2TB kernel logical memory map + + Translation table lookup with 4KB pages: +--------+--------+--------+--------+--------+--------+--------+--------+ |