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

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

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2014-04-13 18:57:29 +01:00
parent 4585eaff63
commit b4b20ad881
4 changed files with 20 additions and 9 deletions
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5
arch/arm/mm/alignment.c
View File

@ -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

10
arch/arm/mm/init.c
View File

@ -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;

4
arch/arm/mm/mm.h
View File

@ -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);

10
arch/arm/mm/mmu.c
View File

@ -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);