diff options
| author | R Sricharan <r.sricharan@ti.com> | 2013-03-04 20:04:45 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2013-03-28 09:10:58 +0100 |
| commit | de63ac278cbaaa387da3efaf0b21b819c2b0c496 (patch) | |
| tree | 0fd5fac28bf5733062dee5a14881508569f4d709 /arch/arm/include/asm/system.h | |
| parent | 96fdbec2f96c9e11758c8742409069eeef841722 (diff) | |
ARM: mmu: Set domain permissions to client access
The 'XN' execute never bit is set in the pagetables. This will
prevent speculative prefetches to non executable regions. But the
domain permissions are set as master in the DACR register.
So the pagetable attribute for 'XN' is not effective. Change the
permissions to client.
This fixes lot of speculative prefetch aborts seen on OMAP5
secure devices.
Signed-off-by: R Sricharan <r.sricharan@ti.com>
Tested-by: Vincent Stehle <v-stehle@ti.com>
Cc: Vincent Stehle <v-stehle@ti.com>
Cc: Tom Rini <trini@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Diffstat (limited to 'arch/arm/include/asm/system.h')
| -rw-r--r-- | arch/arm/include/asm/system.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 1918492eae..760345f847 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -81,6 +81,20 @@ static inline void set_cr(unsigned int val) isb(); } +static inline unsigned int get_dacr(void) +{ + unsigned int val; + asm("mrc p15, 0, %0, c3, c0, 0 @ get DACR" : "=r" (val) : : "cc"); + return val; +} + +static inline void set_dacr(unsigned int val) +{ + asm volatile("mcr p15, 0, %0, c3, c0, 0 @ set DACR" + : : "r" (val) : "cc"); + isb(); +} + /* options available for data cache on each page */ enum dcache_option { DCACHE_OFF = 0x12, |