mirror of https://gitee.com/openkylin/linux.git
105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Hyper-V specific APIC code.
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*
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* Copyright (C) 2018, Microsoft, Inc.
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*
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* Author : K. Y. Srinivasan <kys@microsoft.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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*/
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#include <linux/types.h>
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#include <linux/version.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/clockchips.h>
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#include <linux/hyperv.h>
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#include <linux/slab.h>
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#include <linux/cpuhotplug.h>
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#include <asm/hypervisor.h>
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#include <asm/mshyperv.h>
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#ifdef CONFIG_X86_64
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#if IS_ENABLED(CONFIG_HYPERV)
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static u64 hv_apic_icr_read(void)
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{
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u64 reg_val;
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rdmsrl(HV_X64_MSR_ICR, reg_val);
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return reg_val;
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}
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static void hv_apic_icr_write(u32 low, u32 id)
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{
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u64 reg_val;
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reg_val = SET_APIC_DEST_FIELD(id);
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reg_val = reg_val << 32;
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reg_val |= low;
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wrmsrl(HV_X64_MSR_ICR, reg_val);
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}
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static u32 hv_apic_read(u32 reg)
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{
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u32 reg_val, hi;
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switch (reg) {
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case APIC_EOI:
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rdmsr(HV_X64_MSR_EOI, reg_val, hi);
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return reg_val;
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case APIC_TASKPRI:
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rdmsr(HV_X64_MSR_TPR, reg_val, hi);
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return reg_val;
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default:
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return native_apic_mem_read(reg);
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}
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}
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static void hv_apic_write(u32 reg, u32 val)
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{
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switch (reg) {
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case APIC_EOI:
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wrmsr(HV_X64_MSR_EOI, val, 0);
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break;
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case APIC_TASKPRI:
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wrmsr(HV_X64_MSR_TPR, val, 0);
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break;
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default:
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native_apic_mem_write(reg, val);
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}
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}
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static void hv_apic_eoi_write(u32 reg, u32 val)
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{
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wrmsr(HV_X64_MSR_EOI, val, 0);
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}
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void __init hv_apic_init(void)
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{
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if (ms_hyperv.hints & HV_X64_APIC_ACCESS_RECOMMENDED) {
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pr_info("Hyper-V: Using MSR based APIC access\n");
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apic_set_eoi_write(hv_apic_eoi_write);
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apic->read = hv_apic_read;
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apic->write = hv_apic_write;
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apic->icr_write = hv_apic_icr_write;
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apic->icr_read = hv_apic_icr_read;
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}
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}
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#endif /* CONFIG_HYPERV */
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#endif /* CONFIG_X86_64 */
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