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| author | Paul Mackerras <paulus@ozlabs.org> | 2016-02-23 05:36:17 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-02-29 12:34:34 +0300 |
| commit | c61a8843124e353f4ba27c073133868da00e0335 (patch) | |
| tree | 0454701b09a320be6186fcd4ed0447af3ee2b4ee /arch/powerpc/include/asm/page.h | |
| parent | f1a9ae034a263d93ea408825afe699aebf37010a (diff) | |
| download | linux-c61a8843124e353f4ba27c073133868da00e0335.tar.xz | |
powerpc/mm/book3s-64: Use physical addresses in upper page table tree levels
This changes the Linux page tables to store physical addresses
rather than kernel virtual addresses in the upper levels of the
tree (pgd, pud and pmd) for 64-bit Book 3S machines.
This also changes the hugepd pointers used to implement hugepages
when the base page size is 4k to store physical addresses rather than
virtual addresses (again just for 64-bit Book3S machines).
This frees up some high order bits, and will be needed with
PowerISA v3.0 machines which read the page table tree in hardware
in radix mode.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/page.h')
| -rw-r--r-- | arch/powerpc/include/asm/page.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index e34124f6fbf2..af7a3422a3ef 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -271,6 +271,13 @@ extern long long virt_phys_offset; #else #define PD_HUGE 0x80000000 #endif + +#else /* CONFIG_PPC_BOOK3S_64 */ +/* + * Book3S 64 stores real addresses in the hugepd entries to + * avoid overlaps with _PAGE_PRESENT and _PAGE_PTE. + */ +#define HUGEPD_ADDR_MASK (0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK) #endif /* CONFIG_PPC_BOOK3S_64 */ /* |