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| author | Steve Capper <steve.capper@arm.com> | 2019-08-07 16:55:18 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-08-09 11:17:21 +0100 |
| commit | 5383cc6efed13784ddb3cff2cc183b6b8c50c8db (patch) | |
| tree | e6a050f886096231108a344f6cad53bfa362d169 /arch/arm64/mm/init.c | |
| parent | 90ec95cda91a021d82351c976896a63aa364ebf1 (diff) | |
| download | linux-5383cc6efed13784ddb3cff2cc183b6b8c50c8db.tar.bz2 | |
arm64: mm: Introduce vabits_actual
In order to support 52-bit kernel addresses detectable at boot time, one
needs to know the actual VA_BITS detected. A new variable vabits_actual
is introduced in this commit and employed for the KVM hypervisor layout,
KASAN, fault handling and phys-to/from-virt translation where there
would normally be compile time constants.
In order to maintain performance in phys_to_virt, another variable
physvirt_offset is introduced.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/mm/init.c')
| -rw-r--r-- | arch/arm64/mm/init.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 62927ed02229..e752f46d430e 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -50,6 +50,9 @@ s64 memstart_addr __ro_after_init = -1; EXPORT_SYMBOL(memstart_addr); +s64 physvirt_offset __ro_after_init; +EXPORT_SYMBOL(physvirt_offset); + phys_addr_t arm64_dma_phys_limit __ro_after_init; #ifdef CONFIG_KEXEC_CORE @@ -301,7 +304,7 @@ static void __init fdt_enforce_memory_region(void) void __init arm64_memblock_init(void) { - const s64 linear_region_size = BIT(VA_BITS - 1); + const s64 linear_region_size = BIT(vabits_actual - 1); /* Handle linux,usable-memory-range property */ fdt_enforce_memory_region(); @@ -315,6 +318,8 @@ void __init arm64_memblock_init(void) memstart_addr = round_down(memblock_start_of_DRAM(), ARM64_MEMSTART_ALIGN); + physvirt_offset = PHYS_OFFSET - PAGE_OFFSET; + /* * Remove the memory that we will not be able to cover with the * linear mapping. Take care not to clip the kernel which may be |