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efafc8b2 FT |
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/bootmem.h> | |
25 | #include <linux/cpumask.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/acpi.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/efi.h> | |
30 | #include <linux/irq.h> | |
31 | #include <linux/sfi.h> | |
32 | #include <linux/io.h> | |
33 | ||
34 | #include <asm/io_apic.h> | |
35 | #include <asm/pgtable.h> | |
36 | #include <asm/mpspec.h> | |
37 | #include <asm/setup.h> | |
38 | #include <asm/apic.h> | |
39 | #include <asm/e820.h> | |
40 | ||
41 | #ifdef CONFIG_X86_LOCAL_APIC | |
42 | static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE; | |
43 | ||
44 | void __init mp_sfi_register_lapic_address(unsigned long address) | |
45 | { | |
46 | mp_lapic_addr = address; | |
47 | ||
48 | set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr); | |
49 | if (boot_cpu_physical_apicid == -1U) | |
50 | boot_cpu_physical_apicid = read_apic_id(); | |
51 | ||
52 | pr_info("Boot CPU = %d\n", boot_cpu_physical_apicid); | |
53 | } | |
54 | ||
55 | /* All CPUs enumerated by SFI must be present and enabled */ | |
56 | void __cpuinit mp_sfi_register_lapic(u8 id) | |
57 | { | |
58 | int boot_cpu = 0; | |
59 | ||
60 | if (MAX_APICS - id <= 0) { | |
61 | pr_warning("Processor #%d invalid (max %d)\n", | |
62 | id, MAX_APICS); | |
63 | return; | |
64 | } | |
65 | ||
66 | if (id == boot_cpu_physical_apicid) | |
67 | boot_cpu = 1; | |
68 | pr_info("registering lapic[%d]\n", id); | |
69 | ||
70 | generic_processor_info(id, GET_APIC_VERSION(apic_read(APIC_LVR))); | |
71 | } | |
72 | ||
73 | static int __init sfi_parse_cpus(struct sfi_table_header *table) | |
74 | { | |
75 | struct sfi_table_simple *sb; | |
76 | struct sfi_cpu_table_entry *pentry; | |
77 | int i; | |
78 | int cpu_num; | |
79 | ||
80 | sb = (struct sfi_table_simple *)table; | |
81 | cpu_num = SFI_GET_NUM_ENTRIES(sb, struct sfi_cpu_table_entry); | |
82 | pentry = (struct sfi_cpu_table_entry *)sb->pentry; | |
83 | ||
84 | for (i = 0; i < cpu_num; i++) { | |
85 | mp_sfi_register_lapic(pentry->apic_id); | |
86 | pentry++; | |
87 | } | |
88 | ||
89 | smp_found_config = 1; | |
90 | return 0; | |
91 | } | |
92 | #endif /* CONFIG_X86_LOCAL_APIC */ | |
93 | ||
94 | #ifdef CONFIG_X86_IO_APIC | |
95 | static u32 gsi_base; | |
96 | ||
97 | static int __init sfi_parse_ioapic(struct sfi_table_header *table) | |
98 | { | |
99 | struct sfi_table_simple *sb; | |
100 | struct sfi_apic_table_entry *pentry; | |
101 | int i, num; | |
102 | ||
103 | sb = (struct sfi_table_simple *)table; | |
104 | num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry); | |
105 | pentry = (struct sfi_apic_table_entry *)sb->pentry; | |
106 | ||
107 | for (i = 0; i < num; i++) { | |
108 | mp_register_ioapic(i, pentry->phys_addr, gsi_base); | |
109 | gsi_base += io_apic_get_redir_entries(i); | |
110 | pentry++; | |
111 | } | |
112 | ||
113 | WARN(pic_mode, KERN_WARNING | |
114 | "SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n"); | |
115 | pic_mode = 0; | |
116 | return 0; | |
117 | } | |
118 | #endif /* CONFIG_X86_IO_APIC */ | |
119 | ||
120 | /* | |
121 | * sfi_platform_init(): register lapics & io-apics | |
122 | */ | |
123 | int __init sfi_platform_init(void) | |
124 | { | |
125 | #ifdef CONFIG_X86_LOCAL_APIC | |
126 | mp_sfi_register_lapic_address(sfi_lapic_addr); | |
127 | sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus); | |
128 | #endif | |
129 | #ifdef CONFIG_X86_IO_APIC | |
130 | sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic); | |
131 | #endif | |
132 | return 0; | |
133 | } |