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 */
mp_sfi_register_lapic(u8 id)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
sfi_parse_cpus(struct sfi_table_header * table)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
sfi_parse_ioapic(struct sfi_table_header * table)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 */
sfi_platform_init(void)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 }
110