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