source: mainline/kernel/arch/ia32/src/smp/mps.c@ 623b49f1

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 623b49f1 was 623b49f1, checked in by Martin Decky <martin@…>, 19 years ago

fix signed/unsigned comparison and integer overflow
  • Property mode set to 100644
File size: 10.3 KB
Line 
1/*
2 * Copyright (c) 2001-2005 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup ia32
30 * @{
31 */
32/** @file
33 */
34
35#ifdef CONFIG_SMP
36
37#include <config.h>
38#include <print.h>
39#include <debug.h>
40#include <arch/smp/mps.h>
41#include <arch/smp/apic.h>
42#include <arch/smp/smp.h>
43#include <func.h>
44#include <arch/types.h>
45#include <cpu.h>
46#include <arch/asm.h>
47#include <arch/bios/bios.h>
48#include <mm/frame.h>
49
50/*
51 * MultiProcessor Specification detection code.
52 */
53
54#define FS_SIGNATURE 0x5f504d5f
55#define CT_SIGNATURE 0x504d4350
56
57int mps_fs_check(uint8_t *base);
58int mps_ct_check(void);
59
60int configure_via_ct(void);
61int configure_via_default(uint8_t n);
62
63int ct_processor_entry(struct __processor_entry *pr);
64void ct_bus_entry(struct __bus_entry *bus);
65void ct_io_apic_entry(struct __io_apic_entry *ioa);
66void ct_io_intr_entry(struct __io_intr_entry *iointr);
67void ct_l_intr_entry(struct __l_intr_entry *lintr);
68
69void ct_extended_entries(void);
70
71static struct mps_fs *fs;
72static struct mps_ct *ct;
73
74struct __processor_entry *processor_entries = NULL;
75struct __bus_entry *bus_entries = NULL;
76struct __io_apic_entry *io_apic_entries = NULL;
77struct __io_intr_entry *io_intr_entries = NULL;
78struct __l_intr_entry *l_intr_entries = NULL;
79
80unsigned int processor_entry_cnt = 0;
81unsigned int bus_entry_cnt = 0;
82unsigned int io_apic_entry_cnt = 0;
83unsigned int io_intr_entry_cnt = 0;
84unsigned int l_intr_entry_cnt = 0;
85
86/*
87 * Implementation of IA-32 SMP configuration interface.
88 */
89static count_t get_cpu_count(void);
90static bool is_cpu_enabled(index_t i);
91static bool is_bsp(index_t i);
92static uint8_t get_cpu_apic_id(index_t i);
93static int mps_irq_to_pin(unsigned int irq);
94
95struct smp_config_operations mps_config_operations = {
96 .cpu_count = get_cpu_count,
97 .cpu_enabled = is_cpu_enabled,
98 .cpu_bootstrap = is_bsp,
99 .cpu_apic_id = get_cpu_apic_id,
100 .irq_to_pin = mps_irq_to_pin
101};
102
103count_t get_cpu_count(void)
104{
105 return processor_entry_cnt;
106}
107
108bool is_cpu_enabled(index_t i)
109{
110 ASSERT(i < processor_entry_cnt);
111 return processor_entries[i].cpu_flags & 0x1;
112}
113
114bool is_bsp(index_t i)
115{
116 ASSERT(i < processor_entry_cnt);
117 return processor_entries[i].cpu_flags & 0x2;
118}
119
120uint8_t get_cpu_apic_id(index_t i)
121{
122 ASSERT(i < processor_entry_cnt);
123 return processor_entries[i].l_apic_id;
124}
125
126
127/*
128 * Used to check the integrity of the MP Floating Structure.
129 */
130int mps_fs_check(uint8_t *base)
131{
132 unsigned int i;
133 uint8_t sum;
134
135 for (i = 0, sum = 0; i < 16; i++)
136 sum += base[i];
137
138 return !sum;
139}
140
141/*
142 * Used to check the integrity of the MP Configuration Table.
143 */
144int mps_ct_check(void)
145{
146 uint8_t *base = (uint8_t *) ct;
147 uint8_t *ext = base + ct->base_table_length;
148 uint8_t sum;
149 int i;
150
151 /* count the checksum for the base table */
152 for (i=0,sum=0; i < ct->base_table_length; i++)
153 sum += base[i];
154
155 if (sum)
156 return 0;
157
158 /* count the checksum for the extended table */
159 for (i=0,sum=0; i < ct->ext_table_length; i++)
160 sum += ext[i];
161
162 return sum == ct->ext_table_checksum;
163}
164
165void mps_init(void)
166{
167 uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xf0000) };
168 unsigned int i, j, length[2] = { 1024, 64 * 1024 };
169
170
171 /*
172 * Find MP Floating Pointer Structure
173 * 1a. search first 1K of EBDA
174 * 1b. if EBDA is undefined, search last 1K of base memory
175 * 2. search 64K starting at 0xf0000
176 */
177
178 addr[0] = (uint8_t *) PA2KA(ebda ? ebda : 639 * 1024);
179 for (i = 0; i < 2; i++) {
180 for (j = 0; j < length[i]; j += 16) {
181 if (*((uint32_t *) &addr[i][j]) == FS_SIGNATURE && mps_fs_check(&addr[i][j])) {
182 fs = (struct mps_fs *) &addr[i][j];
183 goto fs_found;
184 }
185 }
186 }
187
188 return;
189
190fs_found:
191 printf("%p: MPS Floating Pointer Structure\n", fs);
192
193 if (fs->config_type == 0 && fs->configuration_table) {
194 if (fs->mpfib2 >> 7) {
195 printf("%s: PIC mode not supported\n", __FUNCTION__);
196 return;
197 }
198
199 ct = (struct mps_ct *)PA2KA((uintptr_t)fs->configuration_table);
200 config.cpu_count = configure_via_ct();
201 }
202 else
203 config.cpu_count = configure_via_default(fs->config_type);
204
205 return;
206}
207
208int configure_via_ct(void)
209{
210 uint8_t *cur;
211 unsigned int i, cnt;
212
213 if (ct->signature != CT_SIGNATURE) {
214 printf("%s: bad ct->signature\n", __FUNCTION__);
215 return 1;
216 }
217 if (!mps_ct_check()) {
218 printf("%s: bad ct checksum\n", __FUNCTION__);
219 return 1;
220 }
221 if (ct->oem_table) {
222 printf("%s: ct->oem_table not supported\n", __FUNCTION__);
223 return 1;
224 }
225
226 l_apic = (uint32_t *)(uintptr_t)ct->l_apic;
227
228 cnt = 0;
229 cur = &ct->base_table[0];
230 for (i=0; i < ct->entry_count; i++) {
231 switch (*cur) {
232 /* Processor entry */
233 case 0:
234 processor_entries = processor_entries ? processor_entries : (struct __processor_entry *) cur;
235 processor_entry_cnt++;
236 cnt += ct_processor_entry((struct __processor_entry *) cur);
237 cur += 20;
238 break;
239
240 /* Bus entry */
241 case 1:
242 bus_entries = bus_entries ? bus_entries : (struct __bus_entry *) cur;
243 bus_entry_cnt++;
244 ct_bus_entry((struct __bus_entry *) cur);
245 cur += 8;
246 break;
247
248 /* I/O Apic */
249 case 2:
250 io_apic_entries = io_apic_entries ? io_apic_entries : (struct __io_apic_entry *) cur;
251 io_apic_entry_cnt++;
252 ct_io_apic_entry((struct __io_apic_entry *) cur);
253 cur += 8;
254 break;
255
256 /* I/O Interrupt Assignment */
257 case 3:
258 io_intr_entries = io_intr_entries ? io_intr_entries : (struct __io_intr_entry *) cur;
259 io_intr_entry_cnt++;
260 ct_io_intr_entry((struct __io_intr_entry *) cur);
261 cur += 8;
262 break;
263
264 /* Local Interrupt Assignment */
265 case 4:
266 l_intr_entries = l_intr_entries ? l_intr_entries : (struct __l_intr_entry *) cur;
267 l_intr_entry_cnt++;
268 ct_l_intr_entry((struct __l_intr_entry *) cur);
269 cur += 8;
270 break;
271
272 default:
273 /*
274 * Something is wrong. Fallback to UP mode.
275 */
276
277 printf("%s: ct badness\n", __FUNCTION__);
278 return 1;
279 }
280 }
281
282 /*
283 * Process extended entries.
284 */
285 ct_extended_entries();
286 return cnt;
287}
288
289int configure_via_default(uint8_t n)
290{
291 /*
292 * Not yet implemented.
293 */
294 printf("%s: not supported\n", __FUNCTION__);
295 return 1;
296}
297
298
299int ct_processor_entry(struct __processor_entry *pr)
300{
301 /*
302 * Ignore processors which are not marked enabled.
303 */
304 if ((pr->cpu_flags & (1<<0)) == 0)
305 return 0;
306
307 apic_id_mask |= (1<<pr->l_apic_id);
308 return 1;
309}
310
311void ct_bus_entry(struct __bus_entry *bus)
312{
313#ifdef MPSCT_VERBOSE
314 char buf[7];
315 memcpy((void *) buf, (void *) bus->bus_type, 6);
316 buf[6] = 0;
317 printf("bus%d: %s\n", bus->bus_id, buf);
318#endif
319}
320
321void ct_io_apic_entry(struct __io_apic_entry *ioa)
322{
323 static unsigned int io_apic_count = 0;
324
325 /* this ioapic is marked unusable */
326 if ((ioa->io_apic_flags & 1) == 0)
327 return;
328
329 if (io_apic_count++ > 0) {
330 /*
331 * Multiple IO APIC's are currently not supported.
332 */
333 return;
334 }
335
336 io_apic = (uint32_t *)(uintptr_t)ioa->io_apic;
337}
338
339//#define MPSCT_VERBOSE
340void ct_io_intr_entry(struct __io_intr_entry *iointr)
341{
342#ifdef MPSCT_VERBOSE
343 switch (iointr->intr_type) {
344 case 0: printf("INT"); break;
345 case 1: printf("NMI"); break;
346 case 2: printf("SMI"); break;
347 case 3: printf("ExtINT"); break;
348 }
349 putchar(',');
350 switch (iointr->poel&3) {
351 case 0: printf("bus-like"); break;
352 case 1: printf("active high"); break;
353 case 2: printf("reserved"); break;
354 case 3: printf("active low"); break;
355 }
356 putchar(',');
357 switch ((iointr->poel>>2)&3) {
358 case 0: printf("bus-like"); break;
359 case 1: printf("edge-triggered"); break;
360 case 2: printf("reserved"); break;
361 case 3: printf("level-triggered"); break;
362 }
363 putchar(',');
364 printf("bus%d,irq%d", iointr->src_bus_id, iointr->src_bus_irq);
365 putchar(',');
366 printf("io_apic%d,pin%d", iointr->dst_io_apic_id, iointr->dst_io_apic_pin);
367 putchar('\n');
368#endif
369}
370
371void ct_l_intr_entry(struct __l_intr_entry *lintr)
372{
373#ifdef MPSCT_VERBOSE
374 switch (lintr->intr_type) {
375 case 0: printf("INT"); break;
376 case 1: printf("NMI"); break;
377 case 2: printf("SMI"); break;
378 case 3: printf("ExtINT"); break;
379 }
380 putchar(',');
381 switch (lintr->poel&3) {
382 case 0: printf("bus-like"); break;
383 case 1: printf("active high"); break;
384 case 2: printf("reserved"); break;
385 case 3: printf("active low"); break;
386 }
387 putchar(',');
388 switch ((lintr->poel>>2)&3) {
389 case 0: printf("bus-like"); break;
390 case 1: printf("edge-triggered"); break;
391 case 2: printf("reserved"); break;
392 case 3: printf("level-triggered"); break;
393 }
394 putchar(',');
395 printf("bus%d,irq%d", lintr->src_bus_id, lintr->src_bus_irq);
396 putchar(',');
397 printf("l_apic%d,pin%d", lintr->dst_l_apic_id, lintr->dst_l_apic_pin);
398 putchar('\n');
399#endif
400}
401
402void ct_extended_entries(void)
403{
404 uint8_t *ext = (uint8_t *) ct + ct->base_table_length;
405 uint8_t *cur;
406
407 for (cur = ext; cur < ext + ct->ext_table_length; cur += cur[CT_EXT_ENTRY_LEN]) {
408 switch (cur[CT_EXT_ENTRY_TYPE]) {
409 default:
410 printf("%p: skipping MP Configuration Table extended entry type %d\n", cur, cur[CT_EXT_ENTRY_TYPE]);
411 break;
412 }
413 }
414}
415
416int mps_irq_to_pin(unsigned int irq)
417{
418 unsigned int i;
419
420 for (i = 0; i < io_intr_entry_cnt; i++) {
421 if (io_intr_entries[i].src_bus_irq == irq && io_intr_entries[i].intr_type == 0)
422 return io_intr_entries[i].dst_io_apic_pin;
423 }
424
425 return -1;
426}
427
428#endif /* CONFIG_SMP */
429
430/** @}
431 */
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