diff options
| author | Raul E Rangel <rrangel@chromium.org> | 2018-08-20 12:31:11 -0600 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2018-09-12 14:15:11 +0000 |
| commit | 24ae85c3ffb48c72f67a514dcb843c1de54e5416 (patch) | |
| tree | 7990b569495136ce505de044f6c27e265ff80233 /payloads/libpayload/include/x86 | |
| parent | ac8ebd0e73774c83bfa5cb3dd460c662000e0d19 (diff) | |
libpayload/x86/apic: Add an apic_delay method and calibrate the timer
The apic_delay method will halt the CPU and wait for a timer interrupt
to fire. I went with usec because nsec is too granular to guarantee.
This method will be called from an arch_ndelay() method when the delay
is large enough to justify a sleep.
BUG=b:109749762
TEST=Tested it on grunt by changing the _delay method to call
apic_delay().
Change-Id: I80363f06bdb22d0907f895885e607fde1c4c468d
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://review.coreboot.org/28242
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'payloads/libpayload/include/x86')
| -rw-r--r-- | payloads/libpayload/include/x86/arch/apic.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/payloads/libpayload/include/x86/arch/apic.h b/payloads/libpayload/include/x86/arch/apic.h index fdd447361a..ef962f44d8 100644 --- a/payloads/libpayload/include/x86/arch/apic.h +++ b/payloads/libpayload/include/x86/arch/apic.h @@ -40,4 +40,6 @@ uint8_t apic_id(void); /** Signal the end of the interrupt handler. */ void apic_eoi(void); +void apic_delay(unsigned int usec); + #endif /* __ARCH_X86_INCLUDES_ARCH_APIC_H__ */ |