Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * ACRN detection support
 *
 * Copyright (C) 2019 Intel Corporation. All rights reserved.
 *
 * Jason Chen CJ <jason.cj.chen@intel.com>
 * Zhao Yakui <yakui.zhao@intel.com>
 *
 */
 
#include <linux/interrupt.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 hypervisor_cpuid_base("ACRNACRNACRN", 0);
}
 
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);
}
 
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);
}
 
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,
};