ACPI: fix "acpi=ht" boot option
[daniel-s-linux-stuff:linux-kernel.git] / drivers / acpi / tables.c
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  */
25
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/smp.h>
29 #include <linux/string.h>
30 #include <linux/types.h>
31 #include <linux/irq.h>
32 #include <linux/errno.h>
33 #include <linux/acpi.h>
34 #include <linux/bootmem.h>
35
36 #define PREFIX                  "ACPI: "
37
38 #define ACPI_MAX_TABLES         128
39
40 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
41 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
42
43 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
44
45 static int acpi_apic_instance __initdata;
46
47 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
48 {
49         if (!header)
50                 return;
51
52         switch (header->type) {
53
54         case ACPI_MADT_TYPE_LOCAL_APIC:
55                 {
56                         struct acpi_madt_local_apic *p =
57                             (struct acpi_madt_local_apic *)header;
58                         printk(KERN_INFO PREFIX
59                                "LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
60                                p->processor_id, p->id,
61                                (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
62                 }
63                 break;
64
65         case ACPI_MADT_TYPE_LOCAL_X2APIC:
66                 {
67                         struct acpi_madt_local_x2apic *p =
68                             (struct acpi_madt_local_x2apic *)header;
69                         printk(KERN_INFO PREFIX
70                                "X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
71                                p->local_apic_id, p->uid,
72                                (p->lapic_flags & ACPI_MADT_ENABLED) ?
73                                "enabled" : "disabled");
74                 }
75                 break;
76
77         case ACPI_MADT_TYPE_IO_APIC:
78                 {
79                         struct acpi_madt_io_apic *p =
80                             (struct acpi_madt_io_apic *)header;
81                         printk(KERN_INFO PREFIX
82                                "IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
83                                p->id, p->address, p->global_irq_base);
84                 }
85                 break;
86
87         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
88                 {
89                         struct acpi_madt_interrupt_override *p =
90                             (struct acpi_madt_interrupt_override *)header;
91                         printk(KERN_INFO PREFIX
92                                "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
93                                p->bus, p->source_irq, p->global_irq,
94                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
95                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
96                         if (p->inti_flags  &
97                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
98                                 printk(KERN_INFO PREFIX
99                                        "INT_SRC_OVR unexpected reserved flags: 0x%x\n",
100                                        p->inti_flags  &
101                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
102
103                 }
104                 break;
105
106         case ACPI_MADT_TYPE_NMI_SOURCE:
107                 {
108                         struct acpi_madt_nmi_source *p =
109                             (struct acpi_madt_nmi_source *)header;
110                         printk(KERN_INFO PREFIX
111                                "NMI_SRC (%s %s global_irq %d)\n",
112                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
113                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
114                                p->global_irq);
115                 }
116                 break;
117
118         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
119                 {
120                         struct acpi_madt_local_apic_nmi *p =
121                             (struct acpi_madt_local_apic_nmi *)header;
122                         printk(KERN_INFO PREFIX
123                                "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
124                                p->processor_id,
125                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK  ],
126                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
127                                p->lint);
128                 }
129                 break;
130
131         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
132                 {
133                         u16 polarity, trigger;
134                         struct acpi_madt_local_x2apic_nmi *p =
135                             (struct acpi_madt_local_x2apic_nmi *)header;
136
137                         polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
138                         trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
139
140                         printk(KERN_INFO PREFIX
141                                "X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
142                                p->uid,
143                                mps_inti_flags_polarity[polarity],
144                                mps_inti_flags_trigger[trigger],
145                                p->lint);
146                 }
147                 break;
148
149         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
150                 {
151                         struct acpi_madt_local_apic_override *p =
152                             (struct acpi_madt_local_apic_override *)header;
153                         printk(KERN_INFO PREFIX
154                                "LAPIC_ADDR_OVR (address[%p])\n",
155                                (void *)(unsigned long)p->address);
156                 }
157                 break;
158
159         case ACPI_MADT_TYPE_IO_SAPIC:
160                 {
161                         struct acpi_madt_io_sapic *p =
162                             (struct acpi_madt_io_sapic *)header;
163                         printk(KERN_INFO PREFIX
164                                "IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
165                                p->id, (void *)(unsigned long)p->address,
166                                p->global_irq_base);
167                 }
168                 break;
169
170         case ACPI_MADT_TYPE_LOCAL_SAPIC:
171                 {
172                         struct acpi_madt_local_sapic *p =
173                             (struct acpi_madt_local_sapic *)header;
174                         printk(KERN_INFO PREFIX
175                                "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
176                                p->processor_id, p->id, p->eid,
177                                (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
178                 }
179                 break;
180
181         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
182                 {
183                         struct acpi_madt_interrupt_source *p =
184                             (struct acpi_madt_interrupt_source *)header;
185                         printk(KERN_INFO PREFIX
186                                "PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
187                                mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
188                                mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
189                                p->type, p->id, p->eid, p->io_sapic_vector,
190                                p->global_irq);
191                 }
192                 break;
193
194         default:
195                 printk(KERN_WARNING PREFIX
196                        "Found unsupported MADT entry (type = 0x%x)\n",
197                        header->type);
198                 break;
199         }
200 }
201
202
203 int __init
204 acpi_table_parse_entries(char *id,
205                              unsigned long table_size,
206                              int entry_id,
207                              acpi_table_entry_handler handler,
208                              unsigned int max_entries)
209 {
210         struct acpi_table_header *table_header = NULL;
211         struct acpi_subtable_header *entry;
212         unsigned int count = 0;
213         unsigned long table_end;
214         acpi_size tbl_size;
215
216         if (acpi_disabled && !acpi_ht)
217                 return -ENODEV;
218
219         if (!handler)
220                 return -EINVAL;
221
222         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
223                 acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
224         else
225                 acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
226
227         if (!table_header) {
228                 printk(KERN_WARNING PREFIX "%4.4s not present\n", id);
229                 return -ENODEV;
230         }
231
232         table_end = (unsigned long)table_header + table_header->length;
233
234         /* Parse all entries looking for a match. */
235
236         entry = (struct acpi_subtable_header *)
237             ((unsigned long)table_header + table_size);
238
239         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
240                table_end) {
241                 if (entry->type == entry_id
242                     && (!max_entries || count++ < max_entries))
243                         if (handler(entry, table_end)) {
244                                 early_acpi_os_unmap_memory((char *)table_header, tbl_size);
245                                 return -EINVAL;
246                         }
247
248                 entry = (struct acpi_subtable_header *)
249                     ((unsigned long)entry + entry->length);
250         }
251         if (max_entries && count > max_entries) {
252                 printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of "
253                        "%i found\n", id, entry_id, count - max_entries, count);
254         }
255
256         early_acpi_os_unmap_memory((char *)table_header, tbl_size);
257         return count;
258 }
259
260 int __init
261 acpi_table_parse_madt(enum acpi_madt_type id,
262                       acpi_table_entry_handler handler, unsigned int max_entries)
263 {
264         return acpi_table_parse_entries(ACPI_SIG_MADT,
265                                             sizeof(struct acpi_table_madt), id,
266                                             handler, max_entries);
267 }
268
269 /**
270  * acpi_table_parse - find table with @id, run @handler on it
271  *
272  * @id: table id to find
273  * @handler: handler to run
274  *
275  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
276  * run @handler on it.  Return 0 if table found, return on if not.
277  */
278 int __init acpi_table_parse(char *id, acpi_table_handler handler)
279 {
280         struct acpi_table_header *table = NULL;
281         acpi_size tbl_size;
282
283         if (acpi_disabled && !acpi_ht)
284                 return -ENODEV;
285
286         if (!handler)
287                 return -EINVAL;
288
289         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
290                 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
291         else
292                 acpi_get_table_with_size(id, 0, &table, &tbl_size);
293
294         if (table) {
295                 handler(table);
296                 early_acpi_os_unmap_memory(table, tbl_size);
297                 return 0;
298         } else
299                 return 1;
300 }
301
302 /* 
303  * The BIOS is supposed to supply a single APIC/MADT,
304  * but some report two.  Provide a knob to use either.
305  * (don't you wish instance 0 and 1 were not the same?)
306  */
307 static void __init check_multiple_madt(void)
308 {
309         struct acpi_table_header *table = NULL;
310         acpi_size tbl_size;
311
312         acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
313         if (table) {
314                 printk(KERN_WARNING PREFIX
315                        "BIOS bug: multiple APIC/MADT found,"
316                        " using %d\n", acpi_apic_instance);
317                 printk(KERN_WARNING PREFIX
318                        "If \"acpi_apic_instance=%d\" works better, "
319                        "notify linux-acpi@vger.kernel.org\n",
320                        acpi_apic_instance ? 0 : 2);
321                 early_acpi_os_unmap_memory(table, tbl_size);
322
323         } else
324                 acpi_apic_instance = 0;
325
326         return;
327 }
328
329 /*
330  * acpi_table_init()
331  *
332  * find RSDP, find and checksum SDT/XSDT.
333  * checksum all tables, print SDT/XSDT
334  *
335  * result: sdt_entry[] is initialized
336  */
337
338 int __init acpi_table_init(void)
339 {
340         acpi_status status;
341
342         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
343         if (ACPI_FAILURE(status))
344                 return 1;
345
346         check_multiple_madt();
347         return 0;
348 }
349
350 static int __init acpi_parse_apic_instance(char *str)
351 {
352         if (!str)
353                 return -EINVAL;
354
355         acpi_apic_instance = simple_strtoul(str, NULL, 0);
356
357         printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n",
358                acpi_apic_instance);
359
360         return 0;
361 }
362
363 early_param("acpi_apic_instance", acpi_parse_apic_instance);