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authorMark Rutland <mark.rutland@arm.com>2016-01-25 14:45:07 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2016-02-16 18:10:46 +0300
commit961faac114819a01e627fe9c9c82b830bb3849d4 (patch)
treea62450e8dd90c8b8fc1664da00592c8bcb7257c0 /arch/arm64/include/asm/fixmap.h
parent1e531cce68c92b46c7d29f36a72f9a3e5886678f (diff)
downloadlinux-961faac114819a01e627fe9c9c82b830bb3849d4.tar.xz
arm64: mm: add functions to walk tables in fixmap
As a preparatory step to allow us to allocate early page tables from unmapped memory using memblock_alloc, add new p??_{set,clear}_fixmap* functions which can be used to walk page tables outside of the linear mapping by using fixmap slots. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Jeremy Linton <jeremy.linton@arm.com> Cc: Laura Abbott <labbott@fedoraproject.org> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/fixmap.h')
-rw-r--r--arch/arm64/include/asm/fixmap.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
index 309704544d22..1a617d46fce9 100644
--- a/arch/arm64/include/asm/fixmap.h
+++ b/arch/arm64/include/asm/fixmap.h
@@ -62,6 +62,16 @@ enum fixed_addresses {
FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
+
+ /*
+ * Used for kernel page table creation, so unmapped memory may be used
+ * for tables.
+ */
+ FIX_PTE,
+ FIX_PMD,
+ FIX_PUD,
+ FIX_PGD,
+
__end_of_fixed_addresses
};