From 58834eecdeaab191b7c07a5eba8fdf9b637156e8 Mon Sep 17 00:00:00 2001
From: Jonathan Austin <Jonathan.Austin@arm.com>
Date: Thu, 12 Apr 2012 17:52:10 +0100
Subject: [PATCH] ARM: 7385/1: ThumbEE: Use cpuid macros to read ID_PFR0 for
ThumbEE
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>
---
arch/arm/kernel/thumbee.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/kernel/thumbee.c b/arch/arm/kernel/thumbee.c
index aab899764053d..7b8403b766661 100644
--- a/arch/arm/kernel/thumbee.c
+++ b/arch/arm/kernel/thumbee.c
@@ -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;
--
2.30.2