LXR linux/arch/x86/platform/sfi/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
  37/* All CPUs enumerated by SFI must be present and enabled */
  38static void __init mp_sfi_register_lapic(u8 id)
  39{
  40        if (MAX_LOCAL_APIC - id <= 0) {
  41                pr_warning("Processor #%d invalid (max %d)\n",
  42                        id, MAX_LOCAL_APIC);
  43                return;
  44        }
  45
  46        pr_info("registering lapic[%d]\n", id);
  47
  48        generic_processor_info(id, GET_APIC_VERSION(apic_read(APIC_LVR)));
  49}
  50
  51static int __init sfi_parse_cpus(struct sfi_table_header *table)
  52{
  53        struct sfi_table_simple *sb;
  54        struct sfi_cpu_table_entry *pentry;
  55        int i;
  56        int cpu_num;
  57
  58        sb = (struct sfi_table_simple *)table;
  59        cpu_num = SFI_GET_NUM_ENTRIES(sb, struct sfi_cpu_table_entry);
  60        pentry = (struct sfi_cpu_table_entry *)sb->pentry;
  61
  62        for (i = 0; i < cpu_num; i++) {
  63                mp_sfi_register_lapic(pentry->apic_id);
  64                pentry++;
  65        }
  66
  67        smp_found_config = 1;
  68        return 0;
  69}
  70#endif /* CONFIG_X86_LOCAL_APIC */
  71
  72#ifdef CONFIG_X86_IO_APIC
  73
  74static int __init sfi_parse_ioapic(struct sfi_table_header *table)
  75{
  76        struct sfi_table_simple *sb;
  77        struct sfi_apic_table_entry *pentry;
  78        int i, num;
  79
  80        sb = (struct sfi_table_simple *)table;
  81        num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry);
  82        pentry = (struct sfi_apic_table_entry *)sb->pentry;
  83
  84        for (i = 0; i < num; i++) {
  85                mp_register_ioapic(i, pentry->phys_addr, gsi_top);
  86                pentry++;
  87        }
  88
  89        WARN(pic_mode, KERN_WARNING
  90                "SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n");
  91        pic_mode = 0;
  92        return 0;
  93}
  94#endif /* CONFIG_X86_IO_APIC */
  95
  96/*
  97 * sfi_platform_init(): register lapics & io-apics
  98 */
  99int __init sfi_platform_init(void)
 100{
 101#ifdef CONFIG_X86_LOCAL_APIC
 102        register_lapic_address(sfi_lapic_addr);
 103        sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus);
 104#endif
 105#ifdef CONFIG_X86_IO_APIC
 106        sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic);
 107#endif
 108        return 0;
 109}
 110