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arm64: add kconfig symbol to configure physical address size

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ARMv8.2 introduces support for 52-bit physical addresses. To prepare for
supporting this, add a new kconfig symbol to configure the physical
address space size. The symbols will be used in subsequent patches.
Currently the only choice is 48, a later patch will add the option of 52
once the required code is in place.

Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Tested-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
[catalin.marinas@arm.com: folded minor patches into this one]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Kristina Martsenko 2017-12-13 17:07:16 +00:00 committed by Catalin Marinas
parent 50c4c4e268
commit 982aa7c5f0
3 changed files with 18 additions and 2 deletions
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16
arch/arm64/Kconfig
View file

@ -646,6 +646,22 @@ config ARM64_VA_BITS
default 47 if ARM64_VA_BITS_47
default 48 if ARM64_VA_BITS_48
choice
prompt "Physical address space size"
default ARM64_PA_BITS_48
help
Choose the maximum physical address range that the kernel will
support.
config ARM64_PA_BITS_48
bool "48-bit"
endchoice
config ARM64_PA_BITS
int
default 48 if ARM64_PA_BITS_48
config CPU_BIG_ENDIAN
bool "Build big-endian kernel"
help

2
arch/arm64/include/asm/pgtable-hwdef.h
View file

@ -196,7 +196,7 @@
/*
* Highest possible physical address supported.
*/
#define PHYS_MASK_SHIFT (48)
#define PHYS_MASK_SHIFT (CONFIG_ARM64_PA_BITS)
#define PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1)
/*

2
arch/arm64/include/asm/sparsemem.h
View file

@ -17,7 +17,7 @@
#define __ASM_SPARSEMEM_H
#ifdef CONFIG_SPARSEMEM
#define MAX_PHYSMEM_BITS 48
#define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS
#define SECTION_SIZE_BITS 30
#endif