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
  35 static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  36
  37 /* All CPUs enumerated by SFI must be present and enabled */
  38 static void __cpuinit 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
  51 static 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
  74 static 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  */
  99 int __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 }