ia64/xen-unstable

view xen/drivers/acpi/tables.c @ 18887:3db54d2aa8bd

powernow: implement struct cpufreq_driver.verify

Without this, under rare conditions hypervisor crashes are possible
due to this method being called without checking against NULL.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Dec 05 15:22:21 2008 +0000 (2008-12-05)
parents ae29cd95ba7d
children
line source
1 /*
2 * acpi_tables.c - ACPI Boot-Time Table Parsing
3 *
4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 */
26 #include <xen/init.h>
27 #include <xen/kernel.h>
28 #include <xen/smp.h>
29 #include <xen/string.h>
30 #include <xen/types.h>
31 #include <xen/irq.h>
32 #include <xen/errno.h>
33 #include <xen/acpi.h>
35 #define PREFIX "ACPI: "
37 #define ACPI_MAX_TABLES 128
39 static const char *__initdata
40 mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
41 static const char *__initdata
42 mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
44 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
46 static int acpi_apic_instance __initdata;
48 void __init acpi_table_print_madt_entry(struct acpi_subtable_header *header)
49 {
50 if (!header)
51 return;
53 switch (header->type) {
55 case ACPI_MADT_TYPE_LOCAL_APIC:
56 {
57 struct acpi_madt_local_apic *p =
58 (struct acpi_madt_local_apic *)header;
59 printk(KERN_INFO PREFIX
60 "LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
61 p->processor_id, p->id,
62 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
63 }
64 break;
66 case ACPI_MADT_TYPE_IO_APIC:
67 {
68 struct acpi_madt_io_apic *p =
69 (struct acpi_madt_io_apic *)header;
70 printk(KERN_INFO PREFIX
71 "IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
72 p->id, p->address, p->global_irq_base);
73 }
74 break;
76 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
77 {
78 struct acpi_madt_interrupt_override *p =
79 (struct acpi_madt_interrupt_override *)header;
80 printk(KERN_INFO PREFIX
81 "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
82 p->bus, p->source_irq, p->global_irq,
83 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
84 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
85 if (p->inti_flags &
86 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
87 printk(KERN_INFO PREFIX
88 "INT_SRC_OVR unexpected reserved flags: 0x%x\n",
89 p->inti_flags &
90 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
92 }
93 break;
95 case ACPI_MADT_TYPE_NMI_SOURCE:
96 {
97 struct acpi_madt_nmi_source *p =
98 (struct acpi_madt_nmi_source *)header;
99 printk(KERN_INFO PREFIX
100 "NMI_SRC (%s %s global_irq %d)\n",
101 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
102 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
103 p->global_irq);
104 }
105 break;
107 case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
108 {
109 struct acpi_madt_local_apic_nmi *p =
110 (struct acpi_madt_local_apic_nmi *)header;
111 printk(KERN_INFO PREFIX
112 "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
113 p->processor_id,
114 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
115 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
116 p->lint);
117 }
118 break;
120 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
121 {
122 struct acpi_madt_local_apic_override *p =
123 (struct acpi_madt_local_apic_override *)header;
124 printk(KERN_INFO PREFIX
125 "LAPIC_ADDR_OVR (address[%p])\n",
126 (void *)(unsigned long)p->address);
127 }
128 break;
130 case ACPI_MADT_TYPE_IO_SAPIC:
131 {
132 struct acpi_madt_io_sapic *p =
133 (struct acpi_madt_io_sapic *)header;
134 printk(KERN_INFO PREFIX
135 "IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
136 p->id, (void *)(unsigned long)p->address,
137 p->global_irq_base);
138 }
139 break;
141 case ACPI_MADT_TYPE_LOCAL_SAPIC:
142 {
143 struct acpi_madt_local_sapic *p =
144 (struct acpi_madt_local_sapic *)header;
145 printk(KERN_INFO PREFIX
146 "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
147 p->processor_id, p->id, p->eid,
148 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
149 }
150 break;
152 case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
153 {
154 struct acpi_madt_interrupt_source *p =
155 (struct acpi_madt_interrupt_source *)header;
156 printk(KERN_INFO PREFIX
157 "PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
158 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
159 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
160 p->type, p->id, p->eid, p->io_sapic_vector,
161 p->global_irq);
162 }
163 break;
165 default:
166 printk(KERN_WARNING PREFIX
167 "Found unsupported MADT entry (type = 0x%x)\n",
168 header->type);
169 break;
170 }
171 }
174 int __init
175 acpi_table_parse_entries(char *id,
176 unsigned long table_size,
177 int entry_id,
178 acpi_table_entry_handler handler,
179 unsigned int max_entries)
180 {
181 struct acpi_table_header *table_header = NULL;
182 struct acpi_subtable_header *entry;
183 unsigned int count = 0;
184 unsigned long table_end;
186 if (!handler)
187 return -EINVAL;
189 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
190 acpi_get_table(id, acpi_apic_instance, &table_header);
191 else
192 acpi_get_table(id, 0, &table_header);
194 if (!table_header) {
195 printk(KERN_WARNING PREFIX "%4.4s not present\n", id);
196 return -ENODEV;
197 }
199 table_end = (unsigned long)table_header + table_header->length;
201 /* Parse all entries looking for a match. */
203 entry = (struct acpi_subtable_header *)
204 ((unsigned long)table_header + table_size);
206 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
207 table_end) {
208 if (entry->type == entry_id
209 && (!max_entries || count++ < max_entries))
210 if (handler(entry, table_end))
211 return -EINVAL;
213 entry = (struct acpi_subtable_header *)
214 ((unsigned long)entry + entry->length);
215 }
216 if (max_entries && count > max_entries) {
217 printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of "
218 "%i found\n", id, entry_id, count - max_entries, count);
219 }
221 return count;
222 }
224 int __init
225 acpi_table_parse_madt(enum acpi_madt_type id,
226 acpi_table_entry_handler handler, unsigned int max_entries)
227 {
228 return acpi_table_parse_entries(ACPI_SIG_MADT,
229 sizeof(struct acpi_table_madt), id,
230 handler, max_entries);
231 }
233 /**
234 * acpi_table_parse - find table with @id, run @handler on it
235 *
236 * @id: table id to find
237 * @handler: handler to run
238 *
239 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
240 * run @handler on it. Return 0 if table found, return on if not.
241 */
242 int __init acpi_table_parse(char *id, acpi_table_handler handler)
243 {
244 struct acpi_table_header *table = NULL;
246 if (!handler)
247 return -EINVAL;
249 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
250 acpi_get_table(id, acpi_apic_instance, &table);
251 else
252 acpi_get_table(id, 0, &table);
254 if (table) {
255 handler(table);
256 return 0;
257 } else
258 return 1;
259 }
261 /*
262 * The BIOS is supposed to supply a single APIC/MADT,
263 * but some report two. Provide a knob to use either.
264 * (don't you wish instance 0 and 1 were not the same?)
265 */
266 static void __init check_multiple_madt(void)
267 {
268 struct acpi_table_header *table = NULL;
270 acpi_get_table(ACPI_SIG_MADT, 2, &table);
271 if (table) {
272 printk(KERN_WARNING PREFIX
273 "BIOS bug: multiple APIC/MADT found,"
274 " using %d\n", acpi_apic_instance);
275 printk(KERN_WARNING PREFIX
276 "If \"acpi_apic_instance=%d\" works better, "
277 "notify linux-acpi@vger.kernel.org\n",
278 acpi_apic_instance ? 0 : 2);
280 } else
281 acpi_apic_instance = 0;
283 return;
284 }
286 /*
287 * acpi_table_init()
288 *
289 * find RSDP, find and checksum SDT/XSDT.
290 * checksum all tables, print SDT/XSDT
291 *
292 * result: sdt_entry[] is initialized
293 */
295 int __init acpi_table_init(void)
296 {
297 acpi_ut_init_globals();
298 acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
299 check_multiple_madt();
300 return 0;
301 }
303 static int __init acpi_parse_apic_instance(char *str)
304 {
306 acpi_apic_instance = simple_strtoul(str, NULL, 0);
308 printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n",
309 acpi_apic_instance);
311 return 0;
312 }
313 custom_param("acpi_apic_instance", acpi_parse_apic_instance);