LXR linux/arch/x86/kernel/sfi.c

   1/*
   2 * sfi.c - x86 architecture SFI support.
   3 *
   4 * Copyright (c) 2009, Intel Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 *
  15 * You should have received a copy of the GNU General Public License along with
  16 * this program; if not, write to the Free Software Foundation, Inc.,
  17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18 *
  19 */
  20
  21#define KMSG_COMPONENT "SFI"
  22#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  23
  24#include <linux/acpi.h>
  25#include <linux/init.h>
  26#include <linux/sfi.h>
  27#include <linux/io.h>
  28
  29#include <asm/io_apic.h>
  30#include <asm/mpspec.h>
  31#include <asm/setup.h>
  32#include <asm/apic.h>
  33
  34#ifdef CONFIG_X86_LOCAL_APIC
  35static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  36
  37void __init mp_sfi_register_lapic_address(unsigned long address)
  38{
  39        mp_lapic_addr = address;
  40
  41        set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
  42        if (boot_cpu_physical_apicid == -1U)
  43                boot_cpu_physical_apicid = read_apic_id();
  44
  45        pr_info("Boot CPU = %d\n", boot_cpu_physical_apicid);
  46}
  47
  48/* All CPUs enumerated by SFI must be present and enabled */
  49void __cpuinit mp_sfi_register_lapic(u8 id)
  50{
  51        if (MAX_APICS - id <= 0) {
  52                pr_warning("Processor #%d invalid (max %d)\n",
  53                        id, MAX_APICS);
  54                return;
  55        }
  56
  57        pr_info("registering lapic[%d]\n", id);
  58
  59        generic_processor_info(id, GET_APIC_VERSION(apic_read(APIC_LVR)));
  60}
  61
  62static int __init sfi_parse_cpus(struct sfi_table_header *table)
  63{
  64        struct sfi_table_simple *sb;
  65        struct sfi_cpu_table_entry *pentry;
  66        int i;
  67        int cpu_num;
  68
  69        sb = (struct sfi_table_simple *)table;
  70        cpu_num = SFI_GET_NUM_ENTRIES(sb, struct sfi_cpu_table_entry);
  71        pentry = (struct sfi_cpu_table_entry *)sb->pentry;
  72
  73        for (i = 0; i < cpu_num; i++) {
  74                mp_sfi_register_lapic(pentry->apic_id);
  75                pentry++;
  76        }
  77
  78        smp_found_config = 1;
  79        return 0;
  80}
  81#endif /* CONFIG_X86_LOCAL_APIC */
  82
  83#ifdef CONFIG_X86_IO_APIC
  84static u32 gsi_base;
  85
  86static int __init sfi_parse_ioapic(struct sfi_table_header *table)
  87{
  88        struct sfi_table_simple *sb;
  89        struct sfi_apic_table_entry *pentry;
  90        int i, num;
  91
  92        sb = (struct sfi_table_simple *)table;
  93        num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry);
  94        pentry = (struct sfi_apic_table_entry *)sb->pentry;
  95
  96        for (i = 0; i < num; i++) {
  97                mp_register_ioapic(i, pentry->phys_addr, gsi_base);
  98                gsi_base += io_apic_get_redir_entries(i);
  99                pentry++;
 100        }
 101
 102        WARN(pic_mode, KERN_WARNING
 103                "SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n");
 104        pic_mode = 0;
 105        return 0;
 106}
 107#endif /* CONFIG_X86_IO_APIC */
 108
 109/*
 110 * sfi_platform_init(): register lapics & io-apics
 111 */
 112int __init sfi_platform_init(void)
 113{
 114#ifdef CONFIG_X86_LOCAL_APIC
 115        mp_sfi_register_lapic_address(sfi_lapic_addr);
 116        sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus);
 117#endif
 118#ifdef CONFIG_X86_IO_APIC
 119        sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic);
 120#endif
 121        return 0;
 122}
 123