diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2014-09-03 13:19:46 -0500 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-03-27 08:04:40 +0100 |
| commit | c913a9c076ce91cda20a59d199c8286a6dded0d0 (patch) | |
| tree | 1bfbf0d344d1307d1f67e2c6353d00224ae9f639 | |
| parent | b90cd4db4038f6d1eed1f5f17b5835f1e3e88ebd (diff) | |
arm64: add midr_el1 accessor function
Provide access to the MIDR_EL1 register to obtain the
main id for determining CPU implementer and part/revision
information.
BUG=chrome-os-partner:31761
BRANCH=None
TEST=Built and printed the output of this function on ryu.
Change-Id: I42cec75072fc5e8b48f63c1971840fdc415e4326
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: ad19ffe629d9f16b8fd07051ce73533e97fb3f5c
Original-Change-Id: I8b8506ebff8e6f9d7c4f96d7ff7e21803972961e
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/216423
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9032
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
| -rw-r--r-- | src/arch/arm64/armv8/lib/sysctrl.c | 10 | ||||
| -rw-r--r-- | src/arch/arm64/include/armv8/arch/lib_helpers.h | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/src/arch/arm64/armv8/lib/sysctrl.c b/src/arch/arm64/armv8/lib/sysctrl.c index deb991f520..2737f56ad2 100644 --- a/src/arch/arm64/armv8/lib/sysctrl.c +++ b/src/arch/arm64/armv8/lib/sysctrl.c @@ -522,6 +522,16 @@ void raw_write_mair_current(uint64_t mair) SWITCH_CASE_WRITE(raw_write_mair,mair); } +/* MIDR */ +uint32_t raw_read_midr_el1(void) +{ + uint32_t midr_el1; + + __asm__ __volatile__("mrs %0, MIDR_EL1\n\t" : "=r" (midr_el1) : : "memory"); + + return midr_el1; +} + /* MPIDR */ uint64_t raw_read_mpidr_el1(void) { diff --git a/src/arch/arm64/include/armv8/arch/lib_helpers.h b/src/arch/arm64/include/armv8/arch/lib_helpers.h index 8c6198f63f..723fc15831 100644 --- a/src/arch/arm64/include/armv8/arch/lib_helpers.h +++ b/src/arch/arm64/include/armv8/arch/lib_helpers.h @@ -214,6 +214,7 @@ uint64_t raw_read_mair_el3(void); void raw_write_mair_el3(uint64_t mair_el3); uint64_t raw_read_mair_current(void); void raw_write_mair_current(uint64_t mair); +uint32_t raw_read_midr_el1(void); uint64_t raw_read_mpidr_el1(void); uint32_t raw_read_rmr_el1(void); void raw_write_rmr_el1(uint32_t rmr_el1); |