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| author | Michael Brown <mcb30@ipxe.org> | 2024-10-28 13:48:11 +0000 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2024-10-28 13:55:36 +0000 |
| commit | cd54e7c844e2148b46c960d72ed853f8f75bf400 (patch) | |
| tree | 4cf62782e85314f142695eb4792cb756d5f35a07 /src/config/config_timer.c | |
| parent | b0a8eabbf4d32d789686c32809750f95986dc7cb (diff) | |
| download | ipxe-cd54e7c844e2148b46c960d72ed853f8f75bf400.tar.gz | |
[riscv] Add support for RDTIME as a timer source
The Zicntr extension defines an unprivileged wall-clock time CSR that
roughly matches the behaviour of an invariant TSC on x86. The nominal
frequency of this timer may be read from the "timebase-frequency"
property of the CPU node in the device tree.
Add a timer source using RDTIME to provide implementations of udelay()
and currticks(), modelled on the existing RDTSC-based timer for x86.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/config/config_timer.c')
| -rw-r--r-- | src/config/config_timer.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/config/config_timer.c b/src/config/config_timer.c index d53c39939..a4fe69b00 100644 --- a/src/config/config_timer.c +++ b/src/config/config_timer.c @@ -49,3 +49,6 @@ REQUIRE_OBJECT ( linux_timer ); #ifdef TIMER_ACPI REQUIRE_OBJECT ( acpi_timer ); #endif +#ifdef TIMER_ZICNTR +REQUIRE_OBJECT ( zicntr ); +#endif |