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
  35 static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  36
  37 void __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 */
  49 void __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
  62 static 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
  84 static u32 gsi_base;
  85
  86 static 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  */
 112 int __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 }