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Commit b4b20ad8 authored by Russell King's avatar Russell King
Browse files

ARM: provide common method to clear bits in CPU control register 



Several places open-code this manipulation, let's consolidate this.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 4585eaff

arch/arm/mm/alignment.c

+2 −3
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <asm/opcodes.h>



#include "fault.h"

#include "mm.h"



/*

 * 32-bit misaligned trap handler (c) 1998 San Mehat (CCC) -July 1998
@@ -968,9 +969,7 @@ static int __init alignment_init(void) 


#ifdef CONFIG_CPU_CP15

	if (cpu_is_v6_unaligned()) {

		cr_alignment &= ~CR_A;

		cr_no_alignment &= ~CR_A;

		set_cr(cr_alignment);

		set_cr(__clear_cr(CR_A));

		ai_usermode = safe_usermode(ai_usermode, false);

	}

#endif

arch/arm/mm/init.c

+10 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/dma-contiguous.h>

#include <linux/sizes.h>



#include <asm/cp15.h>

#include <asm/mach-types.h>

#include <asm/memblock.h>

#include <asm/prom.h>
@@ -36,6 +37,15 @@ 


#include "mm.h"



#ifdef CONFIG_CPU_CP15_MMU

unsigned long __init __clear_cr(unsigned long mask)

{

	cr_no_alignment = cr_no_alignment & ~mask;

	cr_alignment = cr_alignment & ~mask;

	return cr_alignment;

}

#endif



static phys_addr_t phys_initrd_start __initdata = 0;

static unsigned long phys_initrd_size __initdata = 0;

arch/arm/mm/mm.h

+4 −0
Original line number Diff line number Diff line
@@ -2,6 +2,8 @@ 
#include <linux/list.h>

#include <linux/vmalloc.h>



#include <asm/pgtable.h>



/* the upper-most page table pointer */

extern pmd_t *top_pmd;
@@ -93,3 +95,5 @@ extern phys_addr_t arm_lowmem_limit; 
void __init bootmem_init(void);

void arm_mm_memblock_reserve(void);

void dma_contiguous_remap(void);



unsigned long __clear_cr(unsigned long mask);

arch/arm/mm/mmu.c

+4 −6
Original line number Diff line number Diff line
@@ -125,6 +125,7 @@ static struct cachepolicy cache_policies[] __initdata = { 
 */

static int __init early_cachepolicy(char *p)

{

	unsigned long cr = get_cr();

	int i;



	for (i = 0; i < ARRAY_SIZE(cache_policies); i++) {
@@ -132,8 +133,7 @@ static int __init early_cachepolicy(char *p) 


		if (memcmp(p, cache_policies[i].policy, len) == 0) {

			cachepolicy = i;

			cr_alignment &= ~cache_policies[i].cr_mask;

			cr_no_alignment &= ~cache_policies[i].cr_mask;

			cr = __clear_cr(cache_policies[i].cr_mask);

			break;

		}

	}
@@ -151,7 +151,7 @@ static int __init early_cachepolicy(char *p) 
		cachepolicy = CPOLICY_WRITEBACK;

	}

	flush_cache_all();

	set_cr(cr_alignment);

	set_cr(cr);

	return 0;

}

early_param("cachepolicy", early_cachepolicy);
@@ -188,9 +188,7 @@ early_param("ecc", early_ecc); 


static int __init noalign_setup(char *__unused)

{

	cr_alignment &= ~CR_A;

	cr_no_alignment &= ~CR_A;

	set_cr(cr_alignment);

	set_cr(__clear_cr(CR_A));

	return 1;

}

__setup("noalign", noalign_setup);