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Merge branch 'linus' into core/softlockup
[mirror_ubuntu-hirsute-kernel.git] / arch / x86 / kernel / mpparse.c
CommitLineData
1da177e4 1/*
11113f84 2 * Intel Multiprocessor Specification 1.1 and 1.4
1da177e4
LT		 3 * compliant MP-table parsing routines.
4 *
5 * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
6 * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
85bdddec 7 * (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
1da177e4
LT		 8 */
9
10#include <linux/mm.h>
1da177e4 11#include <linux/init.h>
1da177e4 12#include <linux/delay.h>
1da177e4 13#include <linux/bootmem.h>
1da177e4
LT		 14#include <linux/kernel_stat.h>
15#include <linux/mc146818rtc.h>
16#include <linux/bitops.h>
85bdddec
AS		 17#include <linux/acpi.h>
18#include <linux/module.h>
1da177e4
LT		 19
20#include <asm/smp.h>
1da177e4
LT		 21#include <asm/mtrr.h>
22#include <asm/mpspec.h>
85bdddec 23#include <asm/pgalloc.h>
1da177e4 24#include <asm/io_apic.h>
85bdddec
AS		 25#include <asm/proto.h>
26#include <asm/acpi.h>
ce3fe6b2 27#include <asm/bios_ebda.h>
2944e16b
YL		 28#include <asm/e820.h>
29#include <asm/trampoline.h>
1da177e4
LT		 30
31#include <mach_apic.h>
85bdddec 32#ifdef CONFIG_X86_32
874c4fe3 33#include <mach_apicdef.h>
1da177e4 34#include <mach_mpparse.h>
85bdddec 35#endif
1da177e4 36
1da177e4
LT		 37/*
38 * Checksum an MP configuration block.
39 */
40
41static int __init mpf_checksum(unsigned char *mp, int len)
42{
43 int sum = 0;
44
45 while (len--)
46 sum += *mp++;
47
48 return sum & 0xFF;
49}
50
86420506 51#ifdef CONFIG_X86_NUMAQ
d49c4288 52int found_numaq;
1da177e4
LT		 53/*
54 * Have to match translation table entries to main table entries by counter
55 * hence the mpc_record variable .... can't see a less disgusting way of
56 * doing this ....
57 */
d49c4288
YL		 58struct mpc_config_translation {
59 unsigned char mpc_type;
60 unsigned char trans_len;
61 unsigned char trans_type;
62 unsigned char trans_quad;
63 unsigned char trans_global;
64 unsigned char trans_local;
65 unsigned short trans_reserved;
66};
67
1da177e4 68
4ef81297
AS		 69static int mpc_record;
70static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
71 __cpuinitdata;
d49c4288
YL		 72
73static inline int generate_logical_apicid(int quad, int phys_apicid)
74{
75 return (quad << 4) + (phys_apicid ? phys_apicid << 1 : 1);
76}
77
78
79static inline int mpc_apic_id(struct mpc_config_processor *m,
80 struct mpc_config_translation *translation_record)
81{
82 int quad = translation_record->trans_quad;
83 int logical_apicid = generate_logical_apicid(quad, m->mpc_apicid);
84
85 printk(KERN_DEBUG "Processor #%d %u:%u APIC version %d (quad %d, apic %d)\n",
86 m->mpc_apicid,
87 (m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8,
88 (m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
89 m->mpc_apicver, quad, logical_apicid);
90 return logical_apicid;
91}
92
93int mp_bus_id_to_node[MAX_MP_BUSSES];
94
95int mp_bus_id_to_local[MAX_MP_BUSSES];
96
97static void mpc_oem_bus_info(struct mpc_config_bus *m, char *name,
98 struct mpc_config_translation *translation)
99{
100 int quad = translation->trans_quad;
101 int local = translation->trans_local;
102
103 mp_bus_id_to_node[m->mpc_busid] = quad;
104 mp_bus_id_to_local[m->mpc_busid] = local;
105 printk(KERN_INFO "Bus #%d is %s (node %d)\n",
106 m->mpc_busid, name, quad);
107}
108
109int quad_local_to_mp_bus_id [NR_CPUS/4][4];
110static void mpc_oem_pci_bus(struct mpc_config_bus *m,
111 struct mpc_config_translation *translation)
112{
113 int quad = translation->trans_quad;
114 int local = translation->trans_local;
115
116 quad_local_to_mp_bus_id[quad][local] = m->mpc_busid;
117}
118
86420506 119#endif
1da177e4 120
c853c676
AS		 121static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
122{
123 int apicid;
746f2244 124 char *bootup_cpu = "";
c853c676 125
7b1292e2
GC		 126 if (!(m->mpc_cpuflag & CPU_ENABLED)) {
127 disabled_cpus++;
1da177e4 128 return;
7b1292e2 129 }
4655c7de 130#ifdef CONFIG_X86_NUMAQ
ab530e1f
YL		 131 if (found_numaq)
132 apicid = mpc_apic_id(m, translation_table[mpc_record]);
133 else
134 apicid = m->mpc_apicid;
4655c7de 135#else
4655c7de
AS		 136 apicid = m->mpc_apicid;
137#endif
1da177e4 138 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
746f2244 139 bootup_cpu = " (Bootup-CPU)";
1da177e4 140 boot_cpu_physical_apicid = m->mpc_apicid;
1da177e4
LT		 141 }
142
746f2244 143 printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
c853c676 144 generic_processor_info(apicid, m->mpc_apicver);
1da177e4
LT		 145}
146
85cc35fa 147#ifdef CONFIG_X86_IO_APIC
4ef81297 148static void __init MP_bus_info(struct mpc_config_bus *m)
1da177e4
LT		 149{
150 char str[7];
1da177e4
LT		 151 memcpy(str, m->mpc_bustype, 6);
152 str[6] = 0;
153
0ec153af 154#ifdef CONFIG_X86_NUMAQ
ab530e1f
YL		 155 if (found_numaq)
156 mpc_oem_bus_info(m, str, translation_table[mpc_record]);
0ec153af 157#else
11a62a05 158 printk(KERN_INFO "Bus #%d is %s\n", m->mpc_busid, str);
0ec153af 159#endif
1da177e4 160
5e4edbb7 161#if MAX_MP_BUSSES < 256
c0ec31ad
RD		 162 if (m->mpc_busid >= MAX_MP_BUSSES) {
163 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
4ef81297
AS		 164 " is too large, max. supported is %d\n",
165 m->mpc_busid, str, MAX_MP_BUSSES - 1);
c0ec31ad
RD		 166 return;
167 }
5e4edbb7 168#endif
c0ec31ad 169
f8924e77
AS		 170 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
171 set_bit(m->mpc_busid, mp_bus_not_pci);
172#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
173 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
174#endif
175 } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
d285e338 176#ifdef CONFIG_X86_NUMAQ
ab530e1f
YL		 177 if (found_numaq)
178 mpc_oem_pci_bus(m, translation_table[mpc_record]);
d285e338 179#endif
a6333c3c 180 clear_bit(m->mpc_busid, mp_bus_not_pci);
c0a282c2
AS		 181#if defined(CONFIG_EISA) || defined (CONFIG_MCA)
182 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
4ef81297 183 } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
9e0a2de2 184 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
4ef81297 185 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
1da177e4 186 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
c0a282c2 187#endif
f8924e77
AS		 188 } else
189 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
1da177e4 190}
85cc35fa 191#endif
1da177e4 192
61048c63
AS		 193#ifdef CONFIG_X86_IO_APIC
194
857033a6
AS		 195static int bad_ioapic(unsigned long address)
196{
197 if (nr_ioapics >= MAX_IO_APICS) {
198 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
199 "(found %d)\n", MAX_IO_APICS, nr_ioapics);
200 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
201 }
202 if (!address) {
203 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
204 " found in table, skipping!\n");
205 return 1;
206 }
207 return 0;
208}
209
4ef81297 210static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
1da177e4
LT		 211{
212 if (!(m->mpc_flags & MPC_APIC_USABLE))
213 return;
214
64883ab0 215 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
4ef81297 216 m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
857033a6
AS		 217
218 if (bad_ioapic(m->mpc_apicaddr))
1da177e4 219 return;
857033a6 220
ec2cd0a2
AS		 221 mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
222 mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
223 mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
224 mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
225 mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
1da177e4
LT		 226 nr_ioapics++;
227}
228
2944e16b 229static void print_MP_intsrc_info(struct mpc_config_intsrc *m)
1da177e4 230{
2944e16b 231 printk(KERN_CONT "Int: type %d, pol %d, trig %d, bus %02x,"
1da177e4 232 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
4ef81297
AS		 233 m->mpc_irqtype, m->mpc_irqflag & 3,
234 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
235 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
2944e16b
YL		 236}
237
238static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq)
239{
240 printk(KERN_CONT "Int: type %d, pol %d, trig %d, bus %02x,"
241 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
242 mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3,
243 (mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus,
244 mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
245}
246
fcfa146e 247static void __init assign_to_mp_irq(struct mpc_config_intsrc *m,
2944e16b
YL		 248 struct mp_config_intsrc *mp_irq)
249{
250 mp_irq->mp_dstapic = m->mpc_dstapic;
251 mp_irq->mp_type = m->mpc_type;
252 mp_irq->mp_irqtype = m->mpc_irqtype;
253 mp_irq->mp_irqflag = m->mpc_irqflag;
254 mp_irq->mp_srcbus = m->mpc_srcbus;
255 mp_irq->mp_srcbusirq = m->mpc_srcbusirq;
256 mp_irq->mp_dstirq = m->mpc_dstirq;
257}
258
259static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq,
260 struct mpc_config_intsrc *m)
261{
262 m->mpc_dstapic = mp_irq->mp_dstapic;
263 m->mpc_type = mp_irq->mp_type;
264 m->mpc_irqtype = mp_irq->mp_irqtype;
265 m->mpc_irqflag = mp_irq->mp_irqflag;
266 m->mpc_srcbus = mp_irq->mp_srcbus;
267 m->mpc_srcbusirq = mp_irq->mp_srcbusirq;
268 m->mpc_dstirq = mp_irq->mp_dstirq;
269}
270
fcfa146e 271static int __init mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
2944e16b
YL		 272 struct mpc_config_intsrc *m)
273{
274 if (mp_irq->mp_dstapic != m->mpc_dstapic)
275 return 1;
276 if (mp_irq->mp_type != m->mpc_type)
277 return 2;
278 if (mp_irq->mp_irqtype != m->mpc_irqtype)
279 return 3;
280 if (mp_irq->mp_irqflag != m->mpc_irqflag)
281 return 4;
282 if (mp_irq->mp_srcbus != m->mpc_srcbus)
283 return 5;
284 if (mp_irq->mp_srcbusirq != m->mpc_srcbusirq)
285 return 6;
286 if (mp_irq->mp_dstirq != m->mpc_dstirq)
287 return 7;
288
289 return 0;
290}
291
fcfa146e 292static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
2944e16b
YL		 293{
294 int i;
295
296 print_MP_intsrc_info(m);
297
fcfa146e
YL		 298 for (i = 0; i < mp_irq_entries; i++) {
299 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
300 return;
301 }
2944e16b
YL		 302
303 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
1da177e4
LT		 304 if (++mp_irq_entries == MAX_IRQ_SOURCES)
305 panic("Max # of irq sources exceeded!!\n");
306}
307
61048c63
AS		 308#endif
309
4ef81297 310static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
1da177e4 311{
11a62a05 312 printk(KERN_INFO "Lint: type %d, pol %d, trig %d, bus %02x,"
1da177e4 313 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
4ef81297
AS		 314 m->mpc_irqtype, m->mpc_irqflag & 3,
315 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
316 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
1da177e4
LT		 317}
318
319#ifdef CONFIG_X86_NUMAQ
4ef81297 320static void __init MP_translation_info(struct mpc_config_translation *m)
1da177e4 321{
4ef81297
AS		 322 printk(KERN_INFO
323 "Translation: record %d, type %d, quad %d, global %d, local %d\n",
324 mpc_record, m->trans_type, m->trans_quad, m->trans_global,
325 m->trans_local);
1da177e4 326
4ef81297 327 if (mpc_record >= MAX_MPC_ENTRY)
1da177e4
LT		 328 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
329 else
4ef81297 330 translation_table[mpc_record] = m; /* stash this for later */
1da177e4
LT		 331 if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
332 node_set_online(m->trans_quad);
333}
334
335/*
336 * Read/parse the MPC oem tables
337 */
338
4ef81297
AS		 339static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
340 unsigned short oemsize)
1da177e4 341{
4ef81297
AS		 342 int count = sizeof(*oemtable); /* the header size */
343 unsigned char *oemptr = ((unsigned char *)oemtable) + count;
344
1da177e4 345 mpc_record = 0;
4ef81297
AS		 346 printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
347 oemtable);
348 if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
349 printk(KERN_WARNING
350 "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
351 oemtable->oem_signature[0], oemtable->oem_signature[1],
352 oemtable->oem_signature[2], oemtable->oem_signature[3]);
1da177e4
LT		 353 return;
354 }
4ef81297 355 if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
1da177e4
LT		 356 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
357 return;
358 }
359 while (count < oemtable->oem_length) {
360 switch (*oemptr) {
4ef81297 361 case MP_TRANSLATION:
1da177e4 362 {
4ef81297
AS		 363 struct mpc_config_translation *m =
364 (struct mpc_config_translation *)oemptr;
1da177e4
LT		 365 MP_translation_info(m);
366 oemptr += sizeof(*m);
367 count += sizeof(*m);
368 ++mpc_record;
369 break;
370 }
4ef81297 371 default:
1da177e4 372 {
4ef81297
AS		 373 printk(KERN_WARNING
374 "Unrecognised OEM table entry type! - %d\n",
375 (int)*oemptr);
1da177e4
LT		 376 return;
377 }
378 }
4ef81297 379 }
1da177e4
LT		 380}
381
d49c4288 382void numaq_mps_oem_check(struct mp_config_table *mpc, char *oem,
4ef81297 383 char *productid)
1da177e4
LT		 384{
385 if (strncmp(oem, "IBM NUMA", 8))
d49c4288 386 printk("Warning! Not a NUMA-Q system!\n");
ab530e1f
YL		 387 else
388 found_numaq = 1;
389
1da177e4 390 if (mpc->mpc_oemptr)
4ef81297
AS		 391 smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
392 mpc->mpc_oemsize);
1da177e4 393}
4ef81297 394#endif /* CONFIG_X86_NUMAQ */
1da177e4
LT		 395
396/*
397 * Read/parse the MPC
398 */
399
2944e16b
YL		 400static int __init smp_check_mpc(struct mp_config_table *mpc, char *oem,
401 char *str)
1da177e4 402{
1da177e4 403
4ef81297 404 if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
e950bea8
AS		 405 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
406 mpc->mpc_signature[0], mpc->mpc_signature[1],
407 mpc->mpc_signature[2], mpc->mpc_signature[3]);
1da177e4
LT		 408 return 0;
409 }
4ef81297 410 if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
e950bea8 411 printk(KERN_ERR "MPTABLE: checksum error!\n");
1da177e4
LT		 412 return 0;
413 }
4ef81297 414 if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
e950bea8 415 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
4ef81297 416 mpc->mpc_spec);
1da177e4
LT		 417 return 0;
418 }
419 if (!mpc->mpc_lapic) {
e950bea8 420 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
1da177e4
LT		 421 return 0;
422 }
4ef81297
AS		 423 memcpy(oem, mpc->mpc_oem, 8);
424 oem[8] = 0;
11a62a05 425 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
1da177e4 426
4ef81297
AS		 427 memcpy(str, mpc->mpc_productid, 12);
428 str[12] = 0;
1da177e4 429
11a62a05 430 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
1da177e4 431
e950bea8 432 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
1da177e4 433
2944e16b
YL		 434 return 1;
435}
436
437static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
438{
439 char str[16];
440 char oem[10];
441
442 int count = sizeof(*mpc);
443 unsigned char *mpt = ((unsigned char *)mpc) + count;
444
445 if (!smp_check_mpc(mpc, oem, str))
446 return 0;
447
448#ifdef CONFIG_X86_32
d49c4288
YL		 449 /*
450 * need to make sure summit and es7000's mps_oem_check is safe to be
451 * called early via genericarch 's mps_oem_check
452 */
453 if (early) {
454#ifdef CONFIG_X86_NUMAQ
455 numaq_mps_oem_check(mpc, oem, str);
456#endif
457 } else
458 mps_oem_check(mpc, oem, str);
2944e16b
YL		 459#endif
460
e950bea8 461 /* save the local APIC address, it might be non-default */
1da177e4
LT		 462 if (!acpi_lapic)
463 mp_lapic_addr = mpc->mpc_lapic;
464
888032cd
AS		 465 if (early)
466 return 1;
467
1da177e4 468 /*
4ef81297 469 * Now process the configuration blocks.
1da177e4 470 */
86420506 471#ifdef CONFIG_X86_NUMAQ
1da177e4 472 mpc_record = 0;
86420506 473#endif
1da177e4 474 while (count < mpc->mpc_length) {
4ef81297
AS		 475 switch (*mpt) {
476 case MP_PROCESSOR:
1da177e4 477 {
4ef81297
AS		 478 struct mpc_config_processor *m =
479 (struct mpc_config_processor *)mpt;
1da177e4
LT		 480 /* ACPI may have already provided this data */
481 if (!acpi_lapic)
482 MP_processor_info(m);
483 mpt += sizeof(*m);
484 count += sizeof(*m);
485 break;
486 }
4ef81297 487 case MP_BUS:
1da177e4 488 {
4ef81297
AS		 489 struct mpc_config_bus *m =
490 (struct mpc_config_bus *)mpt;
85cc35fa 491#ifdef CONFIG_X86_IO_APIC
1da177e4 492 MP_bus_info(m);
85cc35fa 493#endif
1da177e4
LT		 494 mpt += sizeof(*m);
495 count += sizeof(*m);
496 break;
497 }
4ef81297 498 case MP_IOAPIC:
1da177e4 499 {
61048c63 500#ifdef CONFIG_X86_IO_APIC
4ef81297
AS		 501 struct mpc_config_ioapic *m =
502 (struct mpc_config_ioapic *)mpt;
1da177e4 503 MP_ioapic_info(m);
61048c63 504#endif
4ef81297
AS		 505 mpt += sizeof(struct mpc_config_ioapic);
506 count += sizeof(struct mpc_config_ioapic);
1da177e4
LT		 507 break;
508 }
4ef81297 509 case MP_INTSRC:
1da177e4 510 {
61048c63 511#ifdef CONFIG_X86_IO_APIC
4ef81297
AS		 512 struct mpc_config_intsrc *m =
513 (struct mpc_config_intsrc *)mpt;
1da177e4
LT		 514
515 MP_intsrc_info(m);
61048c63 516#endif
4ef81297
AS		 517 mpt += sizeof(struct mpc_config_intsrc);
518 count += sizeof(struct mpc_config_intsrc);
1da177e4
LT		 519 break;
520 }
4ef81297 521 case MP_LINTSRC:
1da177e4 522 {
4ef81297
AS		 523 struct mpc_config_lintsrc *m =
524 (struct mpc_config_lintsrc *)mpt;
1da177e4 525 MP_lintsrc_info(m);
4ef81297
AS		 526 mpt += sizeof(*m);
527 count += sizeof(*m);
1da177e4
LT		 528 break;
529 }
4ef81297 530 default:
711554db
YL		 531 /* wrong mptable */
532 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
533 printk(KERN_ERR "type %x\n", *mpt);
534 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
535 1, mpc, mpc->mpc_length, 1);
536 count = mpc->mpc_length;
537 break;
1da177e4 538 }
86420506 539#ifdef CONFIG_X86_NUMAQ
1da177e4 540 ++mpc_record;
86420506 541#endif
1da177e4 542 }
e0da3364
YL		 543
544#ifdef CONFIG_X86_GENERICARCH
545 generic_bigsmp_probe();
546#endif
547
3c43f039 548 setup_apic_routing();
1da177e4 549 if (!num_processors)
e950bea8 550 printk(KERN_ERR "MPTABLE: no processors registered!\n");
1da177e4
LT		 551 return num_processors;
552}
553
61048c63
AS		 554#ifdef CONFIG_X86_IO_APIC
555
1da177e4
LT		 556static int __init ELCR_trigger(unsigned int irq)
557{
558 unsigned int port;
559
560 port = 0x4d0 + (irq >> 3);
561 return (inb(port) >> (irq & 7)) & 1;
562}
563
564static void __init construct_default_ioirq_mptable(int mpc_default_type)
565{
566 struct mpc_config_intsrc intsrc;
567 int i;
568 int ELCR_fallback = 0;
569
570 intsrc.mpc_type = MP_INTSRC;
4ef81297 571 intsrc.mpc_irqflag = 0; /* conforming */
1da177e4 572 intsrc.mpc_srcbus = 0;
ec2cd0a2 573 intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
1da177e4
LT		 574
575 intsrc.mpc_irqtype = mp_INT;
576
577 /*
578 * If true, we have an ISA/PCI system with no IRQ entries
579 * in the MP table. To prevent the PCI interrupts from being set up
580 * incorrectly, we try to use the ELCR. The sanity check to see if
581 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
582 * never be level sensitive, so we simply see if the ELCR agrees.
583 * If it does, we assume it's valid.
584 */
585 if (mpc_default_type == 5) {
62441bf1
AS		 586 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
587 "falling back to ELCR\n");
1da177e4 588
62441bf1
AS		 589 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
590 ELCR_trigger(13))
591 printk(KERN_ERR "ELCR contains invalid data... "
592 "not using ELCR\n");
1da177e4 593 else {
4ef81297
AS		 594 printk(KERN_INFO
595 "Using ELCR to identify PCI interrupts\n");
1da177e4
LT		 596 ELCR_fallback = 1;
597 }
598 }
599
600 for (i = 0; i < 16; i++) {
601 switch (mpc_default_type) {
602 case 2:
603 if (i == 0 || i == 13)
604 continue; /* IRQ0 & IRQ13 not connected */
605 /* fall through */
606 default:
607 if (i == 2)
608 continue; /* IRQ2 is never connected */
609 }
610
611 if (ELCR_fallback) {
612 /*
613 * If the ELCR indicates a level-sensitive interrupt, we
614 * copy that information over to the MP table in the
615 * irqflag field (level sensitive, active high polarity).
616 */
617 if (ELCR_trigger(i))
618 intsrc.mpc_irqflag = 13;
619 else
620 intsrc.mpc_irqflag = 0;
621 }
622
623 intsrc.mpc_srcbusirq = i;
4ef81297 624 intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
1da177e4
LT		 625 MP_intsrc_info(&intsrc);
626 }
627
628 intsrc.mpc_irqtype = mp_ExtINT;
629 intsrc.mpc_srcbusirq = 0;
4ef81297 630 intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
1da177e4
LT		 631 MP_intsrc_info(&intsrc);
632}
633
61048c63 634
85cc35fa 635static void construct_ioapic_table(int mpc_default_type)
1da177e4 636{
1da177e4 637 struct mpc_config_ioapic ioapic;
85cc35fa 638 struct mpc_config_bus bus;
1da177e4
LT		 639
640 bus.mpc_type = MP_BUS;
641 bus.mpc_busid = 0;
642 switch (mpc_default_type) {
4ef81297 643 default:
62441bf1 644 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
4ef81297
AS		 645 mpc_default_type);
646 /* fall through */
647 case 1:
648 case 5:
649 memcpy(bus.mpc_bustype, "ISA ", 6);
650 break;
651 case 2:
652 case 6:
653 case 3:
654 memcpy(bus.mpc_bustype, "EISA ", 6);
655 break;
656 case 4:
657 case 7:
658 memcpy(bus.mpc_bustype, "MCA ", 6);
1da177e4
LT		 659 }
660 MP_bus_info(&bus);
661 if (mpc_default_type > 4) {
662 bus.mpc_busid = 1;
663 memcpy(bus.mpc_bustype, "PCI ", 6);
664 MP_bus_info(&bus);
665 }
666
667 ioapic.mpc_type = MP_IOAPIC;
668 ioapic.mpc_apicid = 2;
669 ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
670 ioapic.mpc_flags = MPC_APIC_USABLE;
671 ioapic.mpc_apicaddr = 0xFEC00000;
672 MP_ioapic_info(&ioapic);
673
674 /*
675 * We set up most of the low 16 IO-APIC pins according to MPS rules.
676 */
677 construct_default_ioirq_mptable(mpc_default_type);
85cc35fa
TG		 678}
679#else
680static inline void construct_ioapic_table(int mpc_default_type) { }
61048c63 681#endif
85cc35fa
TG		 682
683static inline void __init construct_default_ISA_mptable(int mpc_default_type)
684{
685 struct mpc_config_processor processor;
686 struct mpc_config_lintsrc lintsrc;
687 int linttypes[2] = { mp_ExtINT, mp_NMI };
688 int i;
689
690 /*
691 * local APIC has default address
692 */
693 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
694
695 /*
696 * 2 CPUs, numbered 0 & 1.
697 */
698 processor.mpc_type = MP_PROCESSOR;
699 /* Either an integrated APIC or a discrete 82489DX. */
700 processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
701 processor.mpc_cpuflag = CPU_ENABLED;
702 processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
703 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
704 processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
705 processor.mpc_reserved[0] = 0;
706 processor.mpc_reserved[1] = 0;
707 for (i = 0; i < 2; i++) {
708 processor.mpc_apicid = i;
709 MP_processor_info(&processor);
710 }
711
712 construct_ioapic_table(mpc_default_type);
713
1da177e4 714 lintsrc.mpc_type = MP_LINTSRC;
4ef81297 715 lintsrc.mpc_irqflag = 0; /* conforming */
1da177e4
LT		 716 lintsrc.mpc_srcbusid = 0;
717 lintsrc.mpc_srcbusirq = 0;
718 lintsrc.mpc_destapic = MP_APIC_ALL;
719 for (i = 0; i < 2; i++) {
720 lintsrc.mpc_irqtype = linttypes[i];
721 lintsrc.mpc_destapiclint = i;
722 MP_lintsrc_info(&lintsrc);
723 }
724}
725
726static struct intel_mp_floating *mpf_found;
727
3b33553b
IM		 728/*
729 * Machine specific quirk for finding the SMP config before other setup
730 * activities destroy the table:
731 */
732int (*mach_get_smp_config_quirk)(unsigned int early);
733
1da177e4
LT		 734/*
735 * Scan the memory blocks for an SMP configuration block.
736 */
3b33553b 737static void __init __get_smp_config(unsigned int early)
1da177e4
LT		 738{
739 struct intel_mp_floating *mpf = mpf_found;
740
3b33553b
IM		 741 if (mach_get_smp_config_quirk) {
742 if (mach_get_smp_config_quirk(early))
743 return;
744 }
888032cd
AS		 745 if (acpi_lapic && early)
746 return;
1da177e4 747 /*
4ef81297 748 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1da177e4
LT		 749 * processors, where MPS only supports physical.
750 */
751 if (acpi_lapic && acpi_ioapic) {
4421b1c8
AS		 752 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
753 "information\n");
1da177e4 754 return;
4ef81297 755 } else if (acpi_lapic)
4421b1c8
AS		 756 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
757 "configuration information\n");
1da177e4 758
4ef81297
AS		 759 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
760 mpf->mpf_specification);
b3e24164 761#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
4ef81297 762 if (mpf->mpf_feature2 & (1 << 7)) {
1da177e4
LT		 763 printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
764 pic_mode = 1;
765 } else {
766 printk(KERN_INFO " Virtual Wire compatibility mode.\n");
767 pic_mode = 0;
768 }
4421b1c8 769#endif
1da177e4
LT		 770 /*
771 * Now see if we need to read further.
772 */
773 if (mpf->mpf_feature1 != 0) {
888032cd
AS		 774 if (early) {
775 /*
776 * local APIC has default address
777 */
778 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
779 return;
780 }
1da177e4 781
4ef81297
AS		 782 printk(KERN_INFO "Default MP configuration #%d\n",
783 mpf->mpf_feature1);
1da177e4
LT		 784 construct_default_ISA_mptable(mpf->mpf_feature1);
785
786 } else if (mpf->mpf_physptr) {
787
788 /*
789 * Read the physical hardware table. Anything here will
790 * override the defaults.
791 */
888032cd 792 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
bab4b27c 793#ifdef CONFIG_X86_LOCAL_APIC
1da177e4 794 smp_found_config = 0;
bab4b27c 795#endif
4ef81297
AS		 796 printk(KERN_ERR
797 "BIOS bug, MP table errors detected!...\n");
4421b1c8
AS		 798 printk(KERN_ERR "... disabling SMP support. "
799 "(tell your hw vendor)\n");
1da177e4
LT		 800 return;
801 }
61048c63 802
888032cd
AS		 803 if (early)
804 return;
61048c63 805#ifdef CONFIG_X86_IO_APIC
1da177e4
LT		 806 /*
807 * If there are no explicit MP IRQ entries, then we are
808 * broken. We set up most of the low 16 IO-APIC pins to
809 * ISA defaults and hope it will work.
810 */
811 if (!mp_irq_entries) {
812 struct mpc_config_bus bus;
813
4421b1c8
AS		 814 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
815 "using default mptable. "
816 "(tell your hw vendor)\n");
1da177e4
LT		 817
818 bus.mpc_type = MP_BUS;
819 bus.mpc_busid = 0;
820 memcpy(bus.mpc_bustype, "ISA ", 6);
821 MP_bus_info(&bus);
822
823 construct_default_ioirq_mptable(0);
824 }
61048c63 825#endif
1da177e4
LT		 826 } else
827 BUG();
828
888032cd
AS		 829 if (!early)
830 printk(KERN_INFO "Processors: %d\n", num_processors);
1da177e4
LT		 831 /*
832 * Only use the first configuration found.
833 */
834}
835
888032cd
AS		 836void __init early_get_smp_config(void)
837{
838 __get_smp_config(1);
839}
840
841void __init get_smp_config(void)
842{
843 __get_smp_config(0);
844}
845
846static int __init smp_scan_config(unsigned long base, unsigned long length,
847 unsigned reserve)
1da177e4 848{
92fd4b7a 849 unsigned int *bp = phys_to_virt(base);
1da177e4
LT		 850 struct intel_mp_floating *mpf;
851
11a62a05 852 printk(KERN_DEBUG "Scan SMP from %p for %ld bytes.\n", bp, length);
5d47a271 853 BUILD_BUG_ON(sizeof(*mpf) != 16);
1da177e4
LT		 854
855 while (length > 0) {
856 mpf = (struct intel_mp_floating *)bp;
857 if ((*bp == SMP_MAGIC_IDENT) &&
4ef81297
AS		 858 (mpf->mpf_length == 1) &&
859 !mpf_checksum((unsigned char *)bp, 16) &&
860 ((mpf->mpf_specification == 1)
861 || (mpf->mpf_specification == 4))) {
bab4b27c 862#ifdef CONFIG_X86_LOCAL_APIC
1da177e4 863 smp_found_config = 1;
bab4b27c 864#endif
92fd4b7a 865 mpf_found = mpf;
b1f006b6 866
e91a3b43 867 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
4ef81297 868 mpf, virt_to_phys(mpf));
b1f006b6
YL		 869
870 if (!reserve)
871 return 1;
d2dbf343 872 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
72a7fe39 873 BOOTMEM_DEFAULT);
1da177e4 874 if (mpf->mpf_physptr) {
d2dbf343
YL		 875 unsigned long size = PAGE_SIZE;
876#ifdef CONFIG_X86_32
1da177e4
LT		 877 /*
878 * We cannot access to MPC table to compute
879 * table size yet, as only few megabytes from
880 * the bottom is mapped now.
881 * PC-9800's MPC table places on the very last
882 * of physical memory; so that simply reserving
883 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
884 * in reserve_bootmem.
885 */
1da177e4
LT		 886 unsigned long end = max_low_pfn * PAGE_SIZE;
887 if (mpf->mpf_physptr + size > end)
888 size = end - mpf->mpf_physptr;
d2dbf343
YL		 889#endif
890 reserve_bootmem_generic(mpf->mpf_physptr, size,
72a7fe39 891 BOOTMEM_DEFAULT);
1da177e4
LT		 892 }
893
d2dbf343 894 return 1;
1da177e4
LT		 895 }
896 bp += 4;
897 length -= 16;
898 }
899 return 0;
900}
901
3b33553b
IM		 902int (*mach_find_smp_config_quirk)(unsigned int reserve);
903
904static void __init __find_smp_config(unsigned int reserve)
1da177e4
LT		 905{
906 unsigned int address;
907
3b33553b
IM		 908 if (mach_find_smp_config_quirk) {
909 if (mach_find_smp_config_quirk(reserve))
910 return;
911 }
1da177e4
LT		 912 /*
913 * FIXME: Linux assumes you have 640K of base ram..
914 * this continues the error...
915 *
916 * 1) Scan the bottom 1K for a signature
917 * 2) Scan the top 1K of base RAM
918 * 3) Scan the 64K of bios
919 */
888032cd
AS		 920 if (smp_scan_config(0x0, 0x400, reserve) ||
921 smp_scan_config(639 * 0x400, 0x400, reserve) ||
922 smp_scan_config(0xF0000, 0x10000, reserve))
1da177e4
LT		 923 return;
924 /*
925 * If it is an SMP machine we should know now, unless the
926 * configuration is in an EISA/MCA bus machine with an
927 * extended bios data area.
928 *
929 * there is a real-mode segmented pointer pointing to the
930 * 4K EBDA area at 0x40E, calculate and scan it here.
931 *
932 * NOTE! There are Linux loaders that will corrupt the EBDA
933 * area, and as such this kind of SMP config may be less
934 * trustworthy, simply because the SMP table may have been
935 * stomped on during early boot. These loaders are buggy and
936 * should be fixed.
937 *
938 * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
939 */
940
941 address = get_bios_ebda();
942 if (address)
888032cd
AS		 943 smp_scan_config(address, 0x400, reserve);
944}
945
946void __init early_find_smp_config(void)
947{
948 __find_smp_config(0);
949}
950
951void __init find_smp_config(void)
952{
953 __find_smp_config(1);
1da177e4 954}
2944e16b
YL		 955
956#ifdef CONFIG_X86_IO_APIC
957static u8 __initdata irq_used[MAX_IRQ_SOURCES];
958
959static int __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
960{
961 int i;
962
963 if (m->mpc_irqtype != mp_INT)
964 return 0;
965
966 if (m->mpc_irqflag != 0x0f)
967 return 0;
968
969 /* not legacy */
970
971 for (i = 0; i < mp_irq_entries; i++) {
972 if (mp_irqs[i].mp_irqtype != mp_INT)
973 continue;
974
975 if (mp_irqs[i].mp_irqflag != 0x0f)
976 continue;
977
978 if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
979 continue;
980 if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
981 continue;
982 if (irq_used[i]) {
983 /* already claimed */
984 return -2;
985 }
986 irq_used[i] = 1;
987 return i;
988 }
989
990 /* not found */
991 return -1;
992}
993
994#define SPARE_SLOT_NUM 20
995
996static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
997#endif
998
999static int __init replace_intsrc_all(struct mp_config_table *mpc,
1000 unsigned long mpc_new_phys,
1001 unsigned long mpc_new_length)
1002{
1003#ifdef CONFIG_X86_IO_APIC
1004 int i;
1005 int nr_m_spare = 0;
1006#endif
1007
1008 int count = sizeof(*mpc);
1009 unsigned char *mpt = ((unsigned char *)mpc) + count;
1010
1011 printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
1012 while (count < mpc->mpc_length) {
1013 switch (*mpt) {
1014 case MP_PROCESSOR:
1015 {
1016 struct mpc_config_processor *m =
1017 (struct mpc_config_processor *)mpt;
1018 mpt += sizeof(*m);
1019 count += sizeof(*m);
1020 break;
1021 }
1022 case MP_BUS:
1023 {
1024 struct mpc_config_bus *m =
1025 (struct mpc_config_bus *)mpt;
1026 mpt += sizeof(*m);
1027 count += sizeof(*m);
1028 break;
1029 }
1030 case MP_IOAPIC:
1031 {
1032 mpt += sizeof(struct mpc_config_ioapic);
1033 count += sizeof(struct mpc_config_ioapic);
1034 break;
1035 }
1036 case MP_INTSRC:
1037 {
1038#ifdef CONFIG_X86_IO_APIC
1039 struct mpc_config_intsrc *m =
1040 (struct mpc_config_intsrc *)mpt;
1041
1042 printk(KERN_INFO "OLD ");
1043 print_MP_intsrc_info(m);
1044 i = get_MP_intsrc_index(m);
1045 if (i > 0) {
1046 assign_to_mpc_intsrc(&mp_irqs[i], m);
1047 printk(KERN_INFO "NEW ");
1048 print_mp_irq_info(&mp_irqs[i]);
1049 } else if (!i) {
1050 /* legacy, do nothing */
1051 } else if (nr_m_spare < SPARE_SLOT_NUM) {
1052 /*
1053 * not found (-1), or duplicated (-2)
1054 * are invalid entries,
1055 * we need to use the slot later
1056 */
1057 m_spare[nr_m_spare] = m;
1058 nr_m_spare++;
1059 }
1060#endif
1061 mpt += sizeof(struct mpc_config_intsrc);
1062 count += sizeof(struct mpc_config_intsrc);
1063 break;
1064 }
1065 case MP_LINTSRC:
1066 {
1067 struct mpc_config_lintsrc *m =
1068 (struct mpc_config_lintsrc *)mpt;
1069 mpt += sizeof(*m);
1070 count += sizeof(*m);
1071 break;
1072 }
1073 default:
1074 /* wrong mptable */
1075 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
1076 printk(KERN_ERR "type %x\n", *mpt);
1077 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
1078 1, mpc, mpc->mpc_length, 1);
1079 goto out;
1080 }
1081 }
1082
1083#ifdef CONFIG_X86_IO_APIC
1084 for (i = 0; i < mp_irq_entries; i++) {
1085 if (irq_used[i])
1086 continue;
1087
1088 if (mp_irqs[i].mp_irqtype != mp_INT)
1089 continue;
1090
1091 if (mp_irqs[i].mp_irqflag != 0x0f)
1092 continue;
1093
1094 if (nr_m_spare > 0) {
1095 printk(KERN_INFO "*NEW* found ");
1096 nr_m_spare--;
1097 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
1098 m_spare[nr_m_spare] = NULL;
1099 } else {
1100 struct mpc_config_intsrc *m =
1101 (struct mpc_config_intsrc *)mpt;
1102 count += sizeof(struct mpc_config_intsrc);
1103 if (!mpc_new_phys) {
1104 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
1105 } else {
1106 if (count <= mpc_new_length)
1107 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
1108 else {
1109 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
1110 goto out;
1111 }
1112 }
1113 assign_to_mpc_intsrc(&mp_irqs[i], m);
1114 mpc->mpc_length = count;
1115 mpt += sizeof(struct mpc_config_intsrc);
1116 }
1117 print_mp_irq_info(&mp_irqs[i]);
1118 }
1119#endif
1120out:
1121 /* update checksum */
1122 mpc->mpc_checksum = 0;
1123 mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
1124 mpc->mpc_length);
1125
1126 return 0;
1127}
1128
fcfa146e
YL		 1129static int __initdata enable_update_mptable;
1130
2944e16b
YL		 1131static int __init update_mptable_setup(char *str)
1132{
1133 enable_update_mptable = 1;
1134 return 0;
1135}
1136early_param("update_mptable", update_mptable_setup);
1137
1138static unsigned long __initdata mpc_new_phys;
1139static unsigned long mpc_new_length __initdata = 4096;
1140
1141/* alloc_mptable or alloc_mptable=4k */
1142static int __initdata alloc_mptable;
1143static int __init parse_alloc_mptable_opt(char *p)
1144{
1145 enable_update_mptable = 1;
1146 alloc_mptable = 1;
1147 if (!p)
1148 return 0;
1149 mpc_new_length = memparse(p, &p);
1150 return 0;
1151}
1152early_param("alloc_mptable", parse_alloc_mptable_opt);
1153
1154void __init early_reserve_e820_mpc_new(void)
1155{
1156 if (enable_update_mptable && alloc_mptable) {
1157 u64 startt = 0;
1158#ifdef CONFIG_X86_TRAMPOLINE
1159 startt = TRAMPOLINE_BASE;
1160#endif
1161 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1162 }
1163}
1164
1165static int __init update_mp_table(void)
1166{
1167 char str[16];
1168 char oem[10];
1169 struct intel_mp_floating *mpf;
1170 struct mp_config_table *mpc;
1171 struct mp_config_table *mpc_new;
1172
1173 if (!enable_update_mptable)
1174 return 0;
1175
1176 mpf = mpf_found;
1177 if (!mpf)
1178 return 0;
1179
1180 /*
1181 * Now see if we need to go further.
1182 */
1183 if (mpf->mpf_feature1 != 0)
1184 return 0;
1185
1186 if (!mpf->mpf_physptr)
1187 return 0;
1188
1189 mpc = phys_to_virt(mpf->mpf_physptr);
1190
1191 if (!smp_check_mpc(mpc, oem, str))
1192 return 0;
1193
1194 printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1195 printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1196
1197 if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
1198 mpc_new_phys = 0;
1199 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1200 mpc_new_length);
1201 }
1202
1203 if (!mpc_new_phys) {
1204 unsigned char old, new;
1205 /* check if we can change the postion */
1206 mpc->mpc_checksum = 0;
1207 old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1208 mpc->mpc_checksum = 0xff;
1209 new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1210 if (old == new) {
1211 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1212 return 0;
1213 }
1214 printk(KERN_INFO "use in-positon replacing\n");
1215 } else {
1216 mpf->mpf_physptr = mpc_new_phys;
1217 mpc_new = phys_to_virt(mpc_new_phys);
1218 memcpy(mpc_new, mpc, mpc->mpc_length);
1219 mpc = mpc_new;
1220 /* check if we can modify that */
1221 if (mpc_new_phys - mpf->mpf_physptr) {
1222 struct intel_mp_floating *mpf_new;
1223 /* steal 16 bytes from [0, 1k) */
1224 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1225 mpf_new = phys_to_virt(0x400 - 16);
1226 memcpy(mpf_new, mpf, 16);
1227 mpf = mpf_new;
1228 mpf->mpf_physptr = mpc_new_phys;
1229 }
1230 mpf->mpf_checksum = 0;
1231 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1232 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1233 }
1234
1235 /*
1236 * only replace the one with mp_INT and
1237 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1238 * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1239 * may need pci=routeirq for all coverage
1240 */
1241 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1242
1243 return 0;
1244}
1245
1246late_initcall(update_mp_table);
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