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- // SPDX-License-Identifier: GPL-2.0
- /*
- * ACRN detection support
- *
- * Copyright (C) 2019 Intel Corporation. All rights reserved.
- *
- * Jason Chen CJ <[email protected]>
- * Zhao Yakui <[email protected]>
- *
- */
- #include <linux/interrupt.h>
- #include <asm/acrn.h>
- #include <asm/apic.h>
- #include <asm/cpufeatures.h>
- #include <asm/desc.h>
- #include <asm/hypervisor.h>
- #include <asm/idtentry.h>
- #include <asm/irq_regs.h>
- static u32 __init acrn_detect(void)
- {
- return acrn_cpuid_base();
- }
- static void __init acrn_init_platform(void)
- {
- /* Setup the IDT for ACRN hypervisor callback */
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback);
- x86_platform.calibrate_tsc = acrn_get_tsc_khz;
- x86_platform.calibrate_cpu = acrn_get_tsc_khz;
- }
- static bool acrn_x2apic_available(void)
- {
- return boot_cpu_has(X86_FEATURE_X2APIC);
- }
- static void (*acrn_intr_handler)(void);
- DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
- {
- struct pt_regs *old_regs = set_irq_regs(regs);
- /*
- * The hypervisor requires that the APIC EOI should be acked.
- * If the APIC EOI is not acked, the APIC ISR bit for the
- * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
- * will block the interrupt whose vector is lower than
- * HYPERVISOR_CALLBACK_VECTOR.
- */
- ack_APIC_irq();
- inc_irq_stat(irq_hv_callback_count);
- if (acrn_intr_handler)
- acrn_intr_handler();
- set_irq_regs(old_regs);
- }
- void acrn_setup_intr_handler(void (*handler)(void))
- {
- acrn_intr_handler = handler;
- }
- EXPORT_SYMBOL_GPL(acrn_setup_intr_handler);
- void acrn_remove_intr_handler(void)
- {
- acrn_intr_handler = NULL;
- }
- EXPORT_SYMBOL_GPL(acrn_remove_intr_handler);
- const __initconst struct hypervisor_x86 x86_hyper_acrn = {
- .name = "ACRN",
- .detect = acrn_detect,
- .type = X86_HYPER_ACRN,
- .init.init_platform = acrn_init_platform,
- .init.x2apic_available = acrn_x2apic_available,
- };
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