a92a07d9c0
Extend the local APIC timer delay so that it can be started, and waited for, independently. Add an EOI so that more than one APIC timer interrupt is possible. Previous to this, because there was no EOI, the first timer interrupt the CPU took was also the last it would take -- apic_delay would only work one time. Change-Id: Ib11aeee5b7da81287166ac68fc327e7ae62d1b84 Signed-off-by: Ronald G Minnich <rminnich@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/43323 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: David Hendricks <david.hendricks@gmail.com> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
46 lines
1.9 KiB
C
46 lines
1.9 KiB
C
/*
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*
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* Copyright 2018 Google LLC
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef __ARCH_X86_INCLUDES_ARCH_APIC_H__
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#define __ARCH_X86_INCLUDES_ARCH_APIC_H__
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/** Returns 1 if apic_init has been called */
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int apic_initialized(void);
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void apic_init(void);
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uint8_t apic_id(void);
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/** Signal the end of the interrupt handler. */
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void apic_eoi(uint8_t vector);
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void apic_delay(unsigned int usec);
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void apic_start_delay(unsigned int usec);
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void apic_wait_delay(void);
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#endif /* __ARCH_X86_INCLUDES_ARCH_APIC_H__ */
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