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Commit 516793c6 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] ARMv6: add CPU_HAS_ASID configuration 



Presently, we check for the minimum ARM architecture that we're
building for to determine whether we need ASID support.  This is
wrong - if we're going to support a range of CPUs which include
ARMv6 or higher, we need the ASID.

Convert the checks to use a new configuration symbol, and arrange
for ARMv6 and higher CPU entries to select it.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent c6af66b9

arch/arm/kernel/asm-offsets.c

+1 −1
Original line number Diff line number Diff line
@@ -85,7 +85,7 @@ int main(void) 
  DEFINE(S_OLD_R0,		offsetof(struct pt_regs, ARM_ORIG_r0));

  DEFINE(S_FRAME_SIZE,		sizeof(struct pt_regs));

  BLANK();

#if __LINUX_ARM_ARCH__ >= 6

#ifdef CONFIG_CPU_HAS_ASID

  DEFINE(MM_CONTEXT_ID,		offsetof(struct mm_struct, context.id));

  BLANK();

#endif

arch/arm/mm/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -351,6 +351,7 @@ config CPU_V6 
	select CPU_CACHE_V6

	select CPU_CACHE_VIPT

	select CPU_CP15_MMU

	select CPU_HAS_ASID

	select CPU_COPY_V6 if MMU

	select CPU_TLB_V6 if MMU
@@ -376,6 +377,7 @@ config CPU_V7 
	select CPU_CACHE_V7

	select CPU_CACHE_VIPT

	select CPU_CP15_MMU

	select CPU_HAS_ASID

	select CPU_COPY_V6 if MMU

	select CPU_TLB_V6 if MMU
@@ -498,6 +500,12 @@ config CPU_TLB_V6 


endif



config CPU_HAS_ASID

	bool

	help

	  This indicates whether the CPU has the ASID register; used to

	  tag TLB and possibly cache entries.



config CPU_CP15

	bool

	help

include/asm-arm/mmu.h

+2 −2
Original line number Diff line number Diff line
@@ -4,13 +4,13 @@ 
#ifdef CONFIG_MMU



typedef struct {

#if __LINUX_ARM_ARCH__ >= 6

#ifdef CONFIG_CPU_HAS_ASID

	unsigned int id;

#endif

	unsigned int kvm_seq;

} mm_context_t;



#if __LINUX_ARM_ARCH__ >= 6

#ifdef CONFIG_CPU_HAS_ASID

#define ASID(mm)	((mm)->context.id & 255)

#else

#define ASID(mm)	(0)

include/asm-arm/mmu_context.h

+1 −1
Original line number Diff line number Diff line
@@ -20,7 +20,7 @@ 


void __check_kvm_seq(struct mm_struct *mm);



#if __LINUX_ARM_ARCH__ >= 6

#ifdef CONFIG_CPU_HAS_ASID



/*

 * On ARMv6, we have the following structure in the Context ID: