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 84 85static int __init sfi_parse_ioapic(struct sfi_table_header *table) 86{ 87 struct sfi_table_simple *sb; 88 struct sfi_apic_table_entry *pentry; 89 int i, num; 90 91 sb = (struct sfi_table_simple *)table; 92 num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry); 93 pentry = (struct sfi_apic_table_entry *)sb->pentry; 94 95 for (i = 0; i < num; i++) { 96 mp_register_ioapic(i, pentry->phys_addr, gsi_top); 97 pentry++; 98 } 99 100 WARN(pic_mode, KERN_WARNING 101 "SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n"); 102 pic_mode = 0; 103 return 0; 104} 105#endif /* CONFIG_X86_IO_APIC */ 106 107/* 108 * sfi_platform_init(): register lapics & io-apics 109 */ 110int __init sfi_platform_init(void) 111{ 112#ifdef CONFIG_X86_LOCAL_APIC 113 mp_sfi_register_lapic_address(sfi_lapic_addr); 114 sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus); 115#endif 116#ifdef CONFIG_X86_IO_APIC 117 sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic); 118#endif 119 return 0; 120} 121