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ARM: 7385/1: ThumbEE: Use cpuid macros to read ID_PFR0 for ThumbEE

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The ThumbEE probe code uses inline assembly to read ID_PFR0 in order to
detect whether ThumbEE is implemented by the processor.

This patch replaces the inline asm with the read_cpuid_ext macro.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jonathan Austin 2012-04-12 17:52:10 +01:00 committed by Russell King
parent ce94df9c09
commit 58834eecde
1 changed files with 2 additions and 2 deletions
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4
arch/arm/kernel/thumbee.c
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@ -20,6 +20,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/cputype.h>
#include <asm/system_info.h>
#include <asm/thread_notify.h>
@ -67,8 +68,7 @@ static int __init thumbee_init(void)
if (cpu_arch < CPU_ARCH_ARMv7)
return 0;
/* processor feature register 0 */
asm("mrc p15, 0, %0, c0, c1, 0\n" : "=r" (pfr0));
pfr0 = read_cpuid_ext(CPUID_EXT_PFR0);
if ((pfr0 & 0x0000f000) != 0x00001000)
return 0;