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author | Peter Hoyes <Peter.Hoyes@arm.com> | 2021-07-12 17:04:21 +0300 |
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committer | Tom Rini <trini@konsulko.com> | 2021-07-24 01:53:46 +0300 |
commit | c48fec6e7c6ba173f42c9e8b70c001862e048220 (patch) | |
tree | 0b9cf7df29c0f751cc53c61c9ed7d6026d1ea518 /cmd/mux.c | |
parent | ad7e967738a9c639e07cf50b83ffccdf9a8537b0 (diff) | |
download | u-boot-c48fec6e7c6ba173f42c9e8b70c001862e048220.tar.xz |
armv8: Initialize CNTFRQ if at highest exception level
CNTFRQ_EL0 is only writable from the highest supported exception
level on the platform. For Armv8-A, this is typically EL3, but
technically EL2 and EL3 are optional so it may need to be
initialized at EL2 or EL1. For Armv8-R, the highest exception
level is always EL2.
This patch moves the initialization outside of the switch_el
block and uses a new macro branch_if_not_highest_el which
dynamically detects whether it is at the highest supported
exception level.
Linux's docs state that CNTFRQ_EL0 should be initialized by the
bootloader. If not set, the the U-Boot prompt countdown hangs.
Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Diffstat (limited to 'cmd/mux.c')
0 files changed, 0 insertions, 0 deletions