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author | T Michael Turney <mturney@codeaurora.org> | 2018-04-26 10:14:20 -0700 |
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committer | Julius Werner <jwerner@chromium.org> | 2018-05-01 23:34:03 +0000 |
commit | 1e3e02a1d2cbcaf0f3f9a99ef58654ff6edcf1e4 (patch) | |
tree | 1f09f2e5abf0f12caf43292cc64c01954ac44567 /payloads | |
parent | 7978b8b725c421679d0f87128f1e6277c4edda4b (diff) | |
download | coreboot-1e3e02a1d2cbcaf0f3f9a99ef58654ff6edcf1e4.tar.gz coreboot-1e3e02a1d2cbcaf0f3f9a99ef58654ff6edcf1e4.tar.bz2 coreboot-1e3e02a1d2cbcaf0f3f9a99ef58654ff6edcf1e4.zip |
libpayload: Add raw_read_ functions
Add: raw_read_cntfrq_el0() and raw_read_cntpct_el0()
Required to support Arch64 Timer
Change-Id: I86aa97039304b9e9336d0146febfe1811c9e075a
Signed-off-by: T Michael Turney <mturney@codeaurora.org>
Reviewed-on: https://review.coreboot.org/25649
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'payloads')
-rw-r--r-- | payloads/libpayload/arch/arm64/lib/sysctrl.c | 16 | ||||
-rw-r--r-- | payloads/libpayload/include/arm64/arch/lib_helpers.h | 2 |
2 files changed, 18 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/arm64/lib/sysctrl.c b/payloads/libpayload/arch/arm64/lib/sysctrl.c index c9d80fffd588..6d2421b08bb1 100644 --- a/payloads/libpayload/arch/arm64/lib/sysctrl.c +++ b/payloads/libpayload/arch/arm64/lib/sysctrl.c @@ -1043,3 +1043,19 @@ void raw_write_vbar(uint64_t vbar, uint32_t el) { SWITCH_CASE_WRITE(raw_write_vbar, vbar, el); } + +uint32_t raw_read_cntfrq_el0(void) +{ + uint64_t cntfrq_el0; + + __asm__ __volatile__("mrs %0, CNTFRQ_EL0\n\t" : "=r" (cntfrq_el0) : : "memory"); + return cntfrq_el0; +} + +uint64_t raw_read_cntpct_el0(void) +{ + uint64_t cntpct_el0; + + __asm__ __volatile__("mrs %0, CNTPCT_EL0\n\t" : "=r" (cntpct_el0) : : "memory"); + return cntpct_el0; +} diff --git a/payloads/libpayload/include/arm64/arch/lib_helpers.h b/payloads/libpayload/include/arm64/arch/lib_helpers.h index 2b346c4d4175..99d6dcbc7d89 100644 --- a/payloads/libpayload/include/arm64/arch/lib_helpers.h +++ b/payloads/libpayload/include/arm64/arch/lib_helpers.h @@ -360,6 +360,8 @@ uint64_t raw_read_vbar_current(void); void raw_write_vbar_current(uint64_t vbar); uint64_t raw_read_vbar(uint32_t el); void raw_write_vbar(uint64_t vbar, uint32_t el); +uint64_t raw_read_cntpct_el0(void); +uint32_t raw_read_cntfrq_el0(void); /* Cache maintenance system instructions */ void dccisw(uint64_t cisw); |