arch/x86/kernel/apic/apic_flat_64.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2004 James Cleverdon, IBM.
   4  *
   5  * Flat APIC subarch code.
   6  *
   7  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
   8  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
   9  * James Cleverdon.
  10  */
  11 #include <linux/export.h>
  12
  13 #include <asm/apic.h>
  14
  15 #include "local.h"
  16
  17 static u32 physflat_get_apic_id(u32 x)
  18 {
  19         return (x >> 24) & 0xFF;
  20 }
  21
  22 static int physflat_probe(void)
  23 {
  24         return 1;
  25 }
  26
  27 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  28 {
  29         return 1;
  30 }
  31
  32 static struct apic apic_physflat __ro_after_init = {
  33
  34         .name                           = "physical flat",
  35         .probe                          = physflat_probe,
  36         .acpi_madt_oem_check            = physflat_acpi_madt_oem_check,
  37
  38         .dest_mode_logical              = false,
  39
  40         .disable_esr                    = 0,
  41
  42         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
  43
  44         .max_apic_id                    = 0xFE,
  45         .get_apic_id                    = physflat_get_apic_id,
  46
  47         .calc_dest_apicid               = apic_default_calc_apicid,
  48
  49         .send_IPI                       = default_send_IPI_single_phys,
  50         .send_IPI_mask                  = default_send_IPI_mask_sequence_phys,
  51         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_phys,
  52         .send_IPI_allbutself            = default_send_IPI_allbutself,
  53         .send_IPI_all                   = default_send_IPI_all,
  54         .send_IPI_self                  = default_send_IPI_self,
  55         .nmi_to_offline_cpu             = true,
  56
  57         .read                           = native_apic_mem_read,
  58         .write                          = native_apic_mem_write,
  59         .eoi                            = native_apic_mem_eoi,
  60         .icr_read                       = native_apic_icr_read,
  61         .icr_write                      = native_apic_icr_write,
  62         .wait_icr_idle                  = apic_mem_wait_icr_idle,
  63         .safe_wait_icr_idle             = apic_mem_wait_icr_idle_timeout,
  64 };
  65 apic_driver(apic_physflat);
  66
  67 struct apic *apic __ro_after_init = &apic_physflat;
  68 EXPORT_SYMBOL_GPL(apic);