diff options
| author | Joseph Lo <josephl@nvidia.com> | 2015-04-17 15:31:59 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-04-27 07:45:34 +0200 |
| commit | d8a5017ee0d47e860148d139bc5329083ac06515 (patch) | |
| tree | d7e60204a154442b8fc882d03765a6659209ea20 /src/arch | |
| parent | c38d3e8131b0f6ed7e576d1a66ac9513b1810f27 (diff) | |
arm64: save/restore cptr_el3 and cpacr_el1 registers
CPTR_EL3 and CPACR_EL1 are the registers for controlling the trap level
and access right of the FPU/SIMD instructions. Need to save/restore them
in every power cycle to keep the settings consistent.
BRANCH=none
BUG=none
TEST=boot on smaug/foster, verify the cpu_on/off is ok as well
Change-Id: I96fc0e0d2620e72b6ae2ffe4d073c9328047dc01
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 73e8cc8f25922e7bc218d24fbf4f7c67e15e3057
Original-Change-Id: I51eed07b1bb8f6eb2715622ec5d5c3f80c3c8bdd
Original-Signed-off-by: Joseph Lo <josephl@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/266073
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-by: Benson Leung <bleung@chromium.org>
Reviewed-on: http://review.coreboot.org/9981
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/arm64/include/arch/startup.h | 4 | ||||
| -rw-r--r-- | src/arch/arm64/include/armv8/arch/lib_helpers.h | 10 | ||||
| -rw-r--r-- | src/arch/arm64/stage_entry.S | 6 | ||||
| -rw-r--r-- | src/arch/arm64/startup.c | 5 |
4 files changed, 23 insertions, 2 deletions
diff --git a/src/arch/arm64/include/arch/startup.h b/src/arch/arm64/include/arch/startup.h index 671c13e4cb..6e55190e8a 100644 --- a/src/arch/arm64/include/arch/startup.h +++ b/src/arch/arm64/include/arch/startup.h @@ -30,8 +30,10 @@ #define SCR_INDEX 3 #define VBAR_INDEX 4 #define CNTFRQ_INDEX 5 +#define CPTR_INDEX 6 +#define CPACR_INDEX 7 /* IMPORTANT!!! If any new element is added please update NUM_ELEMENTS */ -#define NUM_ELEMENTS 6 +#define NUM_ELEMENTS 8 #ifndef __ASSEMBLY__ diff --git a/src/arch/arm64/include/armv8/arch/lib_helpers.h b/src/arch/arm64/include/armv8/arch/lib_helpers.h index bb7300f2b7..315a0c0b03 100644 --- a/src/arch/arm64/include/armv8/arch/lib_helpers.h +++ b/src/arch/arm64/include/armv8/arch/lib_helpers.h @@ -261,6 +261,16 @@ 402: .endm +/* Macro to read from an el1 register */ +.macro read_el1 xreg sysreg + mrs \xreg, \sysreg\()_el1 +.endm + +/* Macro to write to an el1 register */ +.macro write_el1 sysreg xreg temp + msr \sysreg\()_el1, \xreg +.endm + /* Macro to read from an el0 register */ .macro read_el0 xreg sysreg mrs \xreg, \sysreg\()_el0 diff --git a/src/arch/arm64/stage_entry.S b/src/arch/arm64/stage_entry.S index cfe8edd1fa..b7dc1b5b33 100644 --- a/src/arch/arm64/stage_entry.S +++ b/src/arch/arm64/stage_entry.S @@ -193,6 +193,12 @@ ENDPROC(__rmodule_entry) get_element_addr CNTFRQ_INDEX write_el0 cntfrq, x0, x1 + get_element_addr CPTR_INDEX + write_el3 cptr, x0, x1 + + get_element_addr CPACR_INDEX + write_el1 cpacr, x0, x1 + dsb sy isb diff --git a/src/arch/arm64/startup.c b/src/arch/arm64/startup.c index 6a85940b1f..ba480bc0a6 100644 --- a/src/arch/arm64/startup.c +++ b/src/arch/arm64/startup.c @@ -46,9 +46,12 @@ void startup_save_cpu_data(void) save_element(TTBR0_INDEX, raw_read_ttbr0_current()); save_element(VBAR_INDEX, raw_read_vbar_current()); save_element(CNTFRQ_INDEX, raw_read_cntfrq_el0()); + save_element(CPACR_INDEX, raw_read_cpacr_el1()); - if (get_current_el() == EL3) + if (get_current_el() == EL3) { save_element(SCR_INDEX, raw_read_scr_el3()); + save_element(CPTR_INDEX, raw_read_cptr_el3()); + } dcache_clean_by_mva(_arm64_startup_data, NUM_ELEMENTS * PER_ELEMENT_SIZE_BYTES); |