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tables.c
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1 /*
2  * acpi_tables.c - ACPI Boot-Time Table Parsing
3  *
4  * Copyright (C) 2001 Paul Diefenbaugh <[email protected]>
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)
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  goto err;
245 
246  /*
247  * If entry->length is 0, break from this loop to avoid
248  * infinite loop.
249  */
250  if (entry->length == 0) {
251  pr_err(PREFIX "[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
252  goto err;
253  }
254 
255  entry = (struct acpi_subtable_header *)
256  ((unsigned long)entry + entry->length);
257  }
258  if (max_entries && count > max_entries) {
259  printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of "
260  "%i found\n", id, entry_id, count - max_entries, count);
261  }
262 
263  early_acpi_os_unmap_memory((char *)table_header, tbl_size);
264  return count;
265 err:
266  early_acpi_os_unmap_memory((char *)table_header, tbl_size);
267  return -EINVAL;
268 }
269 
270 int __init
271 acpi_table_parse_madt(enum acpi_madt_type id,
272  acpi_table_entry_handler handler, unsigned int max_entries)
273 {
274  return acpi_table_parse_entries(ACPI_SIG_MADT,
275  sizeof(struct acpi_table_madt), id,
276  handler, max_entries);
277 }
278 
288 int __init acpi_table_parse(char *id, acpi_table_handler handler)
289 {
290  struct acpi_table_header *table = NULL;
291  acpi_size tbl_size;
292 
293  if (acpi_disabled)
294  return -ENODEV;
295 
296  if (!handler)
297  return -EINVAL;
298 
299  if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
300  acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
301  else
302  acpi_get_table_with_size(id, 0, &table, &tbl_size);
303 
304  if (table) {
305  handler(table);
306  early_acpi_os_unmap_memory(table, tbl_size);
307  return 0;
308  } else
309  return 1;
310 }
311 
312 /*
313  * The BIOS is supposed to supply a single APIC/MADT,
314  * but some report two. Provide a knob to use either.
315  * (don't you wish instance 0 and 1 were not the same?)
316  */
317 static void __init check_multiple_madt(void)
318 {
319  struct acpi_table_header *table = NULL;
320  acpi_size tbl_size;
321 
322  acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
323  if (table) {
324  printk(KERN_WARNING PREFIX
325  "BIOS bug: multiple APIC/MADT found,"
326  " using %d\n", acpi_apic_instance);
327  printk(KERN_WARNING PREFIX
328  "If \"acpi_apic_instance=%d\" works better, "
329  "notify [email protected]\n",
330  acpi_apic_instance ? 0 : 2);
331  early_acpi_os_unmap_memory(table, tbl_size);
332 
333  } else
334  acpi_apic_instance = 0;
335 
336  return;
337 }
338 
339 /*
340  * acpi_table_init()
341  *
342  * find RSDP, find and checksum SDT/XSDT.
343  * checksum all tables, print SDT/XSDT
344  *
345  * result: sdt_entry[] is initialized
346  */
347 
348 int __init acpi_table_init(void)
349 {
350  acpi_status status;
351 
352  status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
353  if (ACPI_FAILURE(status))
354  return 1;
355 
356  check_multiple_madt();
357  return 0;
358 }
359 
360 static int __init acpi_parse_apic_instance(char *str)
361 {
362  if (!str)
363  return -EINVAL;
364 
365  acpi_apic_instance = simple_strtoul(str, NULL, 0);
366 
367  printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n",
368  acpi_apic_instance);
369 
370  return 0;
371 }
372 
373 early_param("acpi_apic_instance", acpi_parse_apic_instance);
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