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arm64/debug: Make use of the system wide safe value

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Use the system wide value of ID_AA64DFR0 to make safer decisions

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Suzuki K. Poulose
2015-10-19 14:24:54 +01:00
committed by Catalin Marinas
parent fe80f9f2da
commit 3085bb01b4
2 changed files with 11 additions and 4 deletions
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6
arch/arm64/kernel/debug-monitors.c
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@@ -26,14 +26,16 @@
#include <linux/stat.h>
#include <linux/uaccess.h>
#include <asm/debug-monitors.h>
#include <asm/cpufeature.h>
#include <asm/cputype.h>
#include <asm/debug-monitors.h>
#include <asm/system_misc.h>
/* Determine debug architecture. */
u8 debug_monitors_arch(void)
{
return read_cpuid(ID_AA64DFR0_EL1) & 0xf;
return cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1),
ID_AA64DFR0_DEBUGVER_SHIFT);
}
/*