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1 jermar 1
/*
2
 * Copyright (C) 2001-2004 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
#include <arch/types.h>
11 jermar 30
#include <arch/smp/apic.h>
31
#include <arch/smp/ap.h>
34 jermar 32
#include <arch/smp/mps.h>
693 decky 33
#include <arch/boot/boot.h>
1 jermar 34
#include <mm/page.h>
35
#include <time/delay.h>
576 palkovsky 36
#include <interrupt.h>
1 jermar 37
#include <arch/interrupt.h>
38
#include <print.h>
39
#include <arch/asm.h>
40
#include <arch.h>
41
 
458 decky 42
#ifdef CONFIG_SMP
16 jermar 43
 
1 jermar 44
/*
512 jermar 45
 * Advanced Programmable Interrupt Controller for SMP systems.
1 jermar 46
 * Tested on:
750 jermar 47
 *  Bochs 2.0.2 - Bochs 2.2.6 with 2-8 CPUs
523 jermar 48
 *  Simics 2.0.28 - Simics 2.2.19 2-15 CPUs
516 jermar 49
 *  VMware Workstation 5.5 with 2 CPUs
812 jermar 50
 *  QEMU 0.8.0 with 2-15 CPUs
1 jermar 51
 *  ASUS P/I-P65UP5 + ASUS C-P55T2D REV. 1.41 with 2x 200Mhz Pentium CPUs
437 decky 52
 *  ASUS PCH-DL with 2x 3000Mhz Pentium 4 Xeon (HT) CPUs
53
 *  MSI K7D Master-L with 2x 2100MHz Athlon MP CPUs
1 jermar 54
 */
55
 
56
/*
57
 * These variables either stay configured as initilalized, or are changed by
58
 * the MP configuration code.
59
 *
60
 * Pay special attention to the volatile keyword. Without it, gcc -O2 would
61
 * optimize the code too much and accesses to l_apic and io_apic, that must
62
 * always be 32-bit, would use byte oriented instructions.
63
 */
64
volatile __u32 *l_apic = (__u32 *) 0xfee00000;
65
volatile __u32 *io_apic = (__u32 *) 0xfec00000;
66
 
67
__u32 apic_id_mask = 0;
68
 
514 jermar 69
static int apic_poll_errors(void);
1 jermar 70
 
515 jermar 71
#ifdef LAPIC_VERBOSE
514 jermar 72
static char *delmod_str[] = {
73
    "Fixed",
74
    "Lowest Priority",
75
    "SMI",
76
    "Reserved",
77
    "NMI",
78
    "INIT",
79
    "STARTUP",
80
    "ExtInt"
81
};
82
 
83
static char *destmod_str[] = {
84
    "Physical",
85
    "Logical"
86
};
87
 
88
static char *trigmod_str[] = {
89
    "Edge",
90
    "Level"
91
};
92
 
93
static char *mask_str[] = {
94
    "Unmasked",
95
    "Masked"
96
};
97
 
98
static char *delivs_str[] = {
99
    "Idle",
100
    "Send Pending"
101
};
102
 
103
static char *tm_mode_str[] = {
104
    "One-shot",
105
    "Periodic"
106
};
107
 
108
static char *intpol_str[] = {
109
    "Polarity High",
110
    "Polarity Low"
111
};
515 jermar 112
#endif /* LAPIC_VERBOSE */
514 jermar 113
 
576 palkovsky 114
 
958 jermar 115
static void apic_spurious(int n, istate_t *istate);
116
static void l_apic_timer_interrupt(int n, istate_t *istate);
576 palkovsky 117
 
513 jermar 118
/** Initialize APIC on BSP. */
1 jermar 119
void apic_init(void)
120
{
515 jermar 121
    io_apic_id_t idreg;
122
    int i;
1 jermar 123
 
958 jermar 124
    exc_register(VECTOR_APIC_SPUR, "apic_spurious", (iroutine) apic_spurious);
1 jermar 125
 
126
    enable_irqs_function = io_apic_enable_irqs;
127
    disable_irqs_function = io_apic_disable_irqs;
128
    eoi_function = l_apic_eoi;
129
 
130
    /*
131
     * Configure interrupt routing.
132
     * IRQ 0 remains masked as the time signal is generated by l_apic's themselves.
133
     * Other interrupts will be forwarded to the lowest priority CPU.
134
     */
135
    io_apic_disable_irqs(0xffff);
958 jermar 136
    exc_register(VECTOR_CLK, "l_apic_timer", (iroutine) l_apic_timer_interrupt);
515 jermar 137
    for (i = 0; i < IRQ_COUNT; i++) {
1 jermar 138
        int pin;
139
 
512 jermar 140
        if ((pin = smp_irq_to_pin(i)) != -1) {
515 jermar 141
            io_apic_change_ioredtbl(pin, DEST_ALL, IVT_IRQBASE+i, LOPRI);
512 jermar 142
        }
1 jermar 143
    }
144
 
145
    /*
146
     * Ensure that io_apic has unique ID.
147
     */
515 jermar 148
    idreg.value = io_apic_read(IOAPICID);
149
    if ((1<<idreg.apic_id) & apic_id_mask) {    /* see if IO APIC ID is used already */
150
        for (i = 0; i < APIC_ID_COUNT; i++) {
1 jermar 151
            if (!((1<<i) & apic_id_mask)) {
515 jermar 152
                idreg.apic_id = i;
153
                io_apic_write(IOAPICID, idreg.value);
1 jermar 154
                break;
155
            }
156
        }
157
    }
158
 
159
    /*
160
     * Configure the BSP's lapic.
161
     */
162
    l_apic_init();
515 jermar 163
 
1 jermar 164
    l_apic_debug();
165
}
166
 
514 jermar 167
/** APIC spurious interrupt handler.
168
 *
169
 * @param n Interrupt vector.
170
 * @param stack Interrupted stack.
171
 */
958 jermar 172
void apic_spurious(int n, istate_t *istate)
1 jermar 173
{
1667 jermar 174
#ifdef CONFIG_DEBUG
15 jermar 175
    printf("cpu%d: APIC spurious interrupt\n", CPU->id);
1667 jermar 176
#endif
1 jermar 177
}
178
 
514 jermar 179
/** Poll for APIC errors.
180
 *
181
 * Examine Error Status Register and report all errors found.
182
 *
183
 * @return 0 on error, 1 on success.
184
 */
1 jermar 185
int apic_poll_errors(void)
186
{
514 jermar 187
    esr_t esr;
1 jermar 188
 
514 jermar 189
    esr.value = l_apic[ESR];
1 jermar 190
 
514 jermar 191
    if (esr.send_checksum_error)
515 jermar 192
        printf("Send Checksum Error\n");
514 jermar 193
    if (esr.receive_checksum_error)
515 jermar 194
        printf("Receive Checksum Error\n");
514 jermar 195
    if (esr.send_accept_error)
1 jermar 196
        printf("Send Accept Error\n");
514 jermar 197
    if (esr.receive_accept_error)
1 jermar 198
        printf("Receive Accept Error\n");
514 jermar 199
    if (esr.send_illegal_vector)
1 jermar 200
        printf("Send Illegal Vector\n");
514 jermar 201
    if (esr.received_illegal_vector)
1 jermar 202
        printf("Received Illegal Vector\n");
514 jermar 203
    if (esr.illegal_register_address)
1 jermar 204
        printf("Illegal Register Address\n");
125 jermar 205
 
514 jermar 206
    return !esr.err_bitmap;
1 jermar 207
}
208
 
514 jermar 209
/** Send all CPUs excluding CPU IPI vector.
210
 *
211
 * @param vector Interrupt vector to be sent.
212
 *
213
 * @return 0 on failure, 1 on success.
5 jermar 214
 */
215
int l_apic_broadcast_custom_ipi(__u8 vector)
216
{
513 jermar 217
    icr_t icr;
5 jermar 218
 
513 jermar 219
    icr.lo = l_apic[ICRlo];
220
    icr.delmod = DELMOD_FIXED;
221
    icr.destmod = DESTMOD_LOGIC;
222
    icr.level = LEVEL_ASSERT;
223
    icr.shorthand = SHORTHAND_ALL_EXCL;
224
    icr.trigger_mode = TRIGMOD_LEVEL;
225
    icr.vector = vector;
5 jermar 226
 
513 jermar 227
    l_apic[ICRlo] = icr.lo;
5 jermar 228
 
513 jermar 229
    icr.lo = l_apic[ICRlo];
1684 jermar 230
    if (icr.delivs == DELIVS_PENDING) {
231
#ifdef CONFIG_DEBUG
5 jermar 232
        printf("IPI is pending.\n");
1684 jermar 233
#endif
234
    }
5 jermar 235
 
236
    return apic_poll_errors();
237
}
238
 
514 jermar 239
/** Universal Start-up Algorithm for bringing up the AP processors.
240
 *
241
 * @param apicid APIC ID of the processor to be brought up.
242
 *
243
 * @return 0 on failure, 1 on success.
1 jermar 244
 */
245
int l_apic_send_init_ipi(__u8 apicid)
246
{
513 jermar 247
    icr_t icr;
1 jermar 248
    int i;
249
 
250
    /*
251
     * Read the ICR register in and zero all non-reserved fields.
252
     */
513 jermar 253
    icr.lo = l_apic[ICRlo];
254
    icr.hi = l_apic[ICRhi];
1 jermar 255
 
513 jermar 256
    icr.delmod = DELMOD_INIT;
257
    icr.destmod = DESTMOD_PHYS;
258
    icr.level = LEVEL_ASSERT;
259
    icr.trigger_mode = TRIGMOD_LEVEL;
260
    icr.shorthand = SHORTHAND_NONE;
261
    icr.vector = 0;
262
    icr.dest = apicid;
1 jermar 263
 
513 jermar 264
    l_apic[ICRhi] = icr.hi;
265
    l_apic[ICRlo] = icr.lo;
27 jermar 266
 
1 jermar 267
    /*
268
     * According to MP Specification, 20us should be enough to
269
     * deliver the IPI.
270
     */
271
    delay(20);
272
 
1684 jermar 273
    if (!apic_poll_errors())
274
        return 0;
1 jermar 275
 
513 jermar 276
    icr.lo = l_apic[ICRlo];
1684 jermar 277
    if (icr.delivs == DELIVS_PENDING) {
278
#ifdef CONFIG_DEBUG
1 jermar 279
        printf("IPI is pending.\n");
1684 jermar 280
#endif
281
    }
27 jermar 282
 
513 jermar 283
    icr.delmod = DELMOD_INIT;
284
    icr.destmod = DESTMOD_PHYS;
285
    icr.level = LEVEL_DEASSERT;
286
    icr.shorthand = SHORTHAND_NONE;
287
    icr.trigger_mode = TRIGMOD_LEVEL;
288
    icr.vector = 0;
289
    l_apic[ICRlo] = icr.lo;
1 jermar 290
 
291
    /*
292
     * Wait 10ms as MP Specification specifies.
293
     */
294
    delay(10000);
295
 
27 jermar 296
    if (!is_82489DX_apic(l_apic[LAVR])) {
297
        /*
298
         * If this is not 82489DX-based l_apic we must send two STARTUP IPI's.
299
         */
300
        for (i = 0; i<2; i++) {
513 jermar 301
            icr.lo = l_apic[ICRlo];
302
            icr.vector = ((__address) ap_boot) / 4096; /* calculate the reset vector */
303
            icr.delmod = DELMOD_STARTUP;
304
            icr.destmod = DESTMOD_PHYS;
305
            icr.level = LEVEL_ASSERT;
306
            icr.shorthand = SHORTHAND_NONE;
307
            icr.trigger_mode = TRIGMOD_LEVEL;
308
            l_apic[ICRlo] = icr.lo;
27 jermar 309
            delay(200);
310
        }
1 jermar 311
    }
312
 
313
    return apic_poll_errors();
314
}
315
 
514 jermar 316
/** Initialize Local APIC. */
1 jermar 317
void l_apic_init(void)
318
{
513 jermar 319
    lvt_error_t error;
320
    lvt_lint_t lint;
750 jermar 321
    tpr_t tpr;
513 jermar 322
    svr_t svr;
514 jermar 323
    icr_t icr;
324
    tdcr_t tdcr;
513 jermar 325
    lvt_tm_t tm;
672 jermar 326
    ldr_t ldr;
327
    dfr_t dfr;
513 jermar 328
    __u32 t1, t2;
1 jermar 329
 
513 jermar 330
    /* Initialize LVT Error register. */
331
    error.value = l_apic[LVT_Err];
332
    error.masked = true;
333
    l_apic[LVT_Err] = error.value;
1 jermar 334
 
513 jermar 335
    /* Initialize LVT LINT0 register. */
336
    lint.value = l_apic[LVT_LINT0];
337
    lint.masked = true;
338
    l_apic[LVT_LINT0] = lint.value;
1 jermar 339
 
513 jermar 340
    /* Initialize LVT LINT1 register. */
341
    lint.value = l_apic[LVT_LINT1];
342
    lint.masked = true;
343
    l_apic[LVT_LINT1] = lint.value;
750 jermar 344
 
345
    /* Task Priority Register initialization. */
346
    tpr.value = l_apic[TPR];
347
    tpr.pri_sc = 0;
348
    tpr.pri = 0;
349
    l_apic[TPR] = tpr.value;
513 jermar 350
 
351
    /* Spurious-Interrupt Vector Register initialization. */
352
    svr.value = l_apic[SVR];
353
    svr.vector = VECTOR_APIC_SPUR;
354
    svr.lapic_enabled = true;
750 jermar 355
    svr.focus_checking = true;
513 jermar 356
    l_apic[SVR] = svr.value;
357
 
31 jermar 358
    if (CPU->arch.family >= 6)
359
        enable_l_apic_in_msr();
1 jermar 360
 
513 jermar 361
    /* Interrupt Command Register initialization. */
362
    icr.lo = l_apic[ICRlo];
363
    icr.delmod = DELMOD_INIT;
364
    icr.destmod = DESTMOD_PHYS;
365
    icr.level = LEVEL_DEASSERT;
366
    icr.shorthand = SHORTHAND_ALL_INCL;
367
    icr.trigger_mode = TRIGMOD_LEVEL;
368
    l_apic[ICRlo] = icr.lo;
1 jermar 369
 
514 jermar 370
    /* Timer Divide Configuration Register initialization. */
371
    tdcr.value = l_apic[TDCR];
372
    tdcr.div_value = DIVIDE_1;
373
    l_apic[TDCR] = tdcr.value;
1 jermar 374
 
514 jermar 375
    /* Program local timer. */
513 jermar 376
    tm.value = l_apic[LVT_Tm];
377
    tm.vector = VECTOR_CLK;
378
    tm.mode = TIMER_PERIODIC;
379
    tm.masked = false;
380
    l_apic[LVT_Tm] = tm.value;
381
 
1540 jermar 382
    /*
383
     * Measure and configure the timer to generate timer
384
     * interrupt with period 1s/HZ seconds.
385
     */
1 jermar 386
    t1 = l_apic[CCRT];
387
    l_apic[ICRT] = 0xffffffff;
388
 
389
    while (l_apic[CCRT] == t1)
390
        ;
391
 
392
    t1 = l_apic[CCRT];
1540 jermar 393
    delay(1000000/HZ);
1 jermar 394
    t2 = l_apic[CCRT];
395
 
396
    l_apic[ICRT] = t1-t2;
672 jermar 397
 
398
    /* Program Logical Destination Register. */
399
    ldr.value = l_apic[LDR];
400
    if (CPU->id < sizeof(CPU->id)*8)    /* size in bits */
401
        ldr.id = (1<<CPU->id);
402
    l_apic[LDR] = ldr.value;
403
 
404
    /* Program Destination Format Register for Flat mode. */
405
    dfr.value = l_apic[DFR];
406
    dfr.model = MODEL_FLAT;
407
    l_apic[DFR] = dfr.value;
1 jermar 408
}
409
 
514 jermar 410
/** Local APIC End of Interrupt. */
1 jermar 411
void l_apic_eoi(void)
412
{
413
    l_apic[EOI] = 0;
414
}
415
 
514 jermar 416
/** Dump content of Local APIC registers. */
1 jermar 417
void l_apic_debug(void)
418
{
419
#ifdef LAPIC_VERBOSE
514 jermar 420
    lvt_tm_t tm;
421
    lvt_lint_t lint;
422
    lvt_error_t error; 
423
 
16 jermar 424
    printf("LVT on cpu%d, LAPIC ID: %d\n", CPU->id, l_apic_id());
1 jermar 425
 
514 jermar 426
    tm.value = l_apic[LVT_Tm];
1196 cejka 427
    printf("LVT Tm: vector=%hhd, %s, %s, %s\n", tm.vector, delivs_str[tm.delivs], mask_str[tm.masked], tm_mode_str[tm.mode]);
514 jermar 428
    lint.value = l_apic[LVT_LINT0];
1196 cejka 429
    printf("LVT LINT0: vector=%hhd, %s, %s, %s, irr=%d, %s, %s\n", tm.vector, delmod_str[lint.delmod], delivs_str[lint.delivs], intpol_str[lint.intpol], lint.irr, trigmod_str[lint.trigger_mode], mask_str[lint.masked]);
514 jermar 430
    lint.value = l_apic[LVT_LINT1];
1196 cejka 431
    printf("LVT LINT1: vector=%hhd, %s, %s, %s, irr=%d, %s, %s\n", tm.vector, delmod_str[lint.delmod], delivs_str[lint.delivs], intpol_str[lint.intpol], lint.irr, trigmod_str[lint.trigger_mode], mask_str[lint.masked]); 
514 jermar 432
    error.value = l_apic[LVT_Err];
1196 cejka 433
    printf("LVT Err: vector=%hhd, %s, %s\n", error.vector, delivs_str[error.delivs], mask_str[error.masked]);
1 jermar 434
#endif
435
}
436
 
514 jermar 437
/** Local APIC Timer Interrupt.
438
 *
439
 * @param n Interrupt vector number.
440
 * @param stack Interrupted stack.
441
 */
958 jermar 442
void l_apic_timer_interrupt(int n, istate_t *istate)
1 jermar 443
{
444
    l_apic_eoi();
445
    clock();
446
}
447
 
514 jermar 448
/** Get Local APIC ID.
449
 *
450
 * @return Local APIC ID.
451
 */
81 jermar 452
__u8 l_apic_id(void)
16 jermar 453
{
515 jermar 454
    l_apic_id_t idreg;
514 jermar 455
 
515 jermar 456
    idreg.value = l_apic[L_APIC_ID];
457
    return idreg.apic_id;
16 jermar 458
}
459
 
514 jermar 460
/** Read from IO APIC register.
461
 *
462
 * @param address IO APIC register address.
463
 *
464
 * @return Content of the addressed IO APIC register.
465
 */
1 jermar 466
__u32 io_apic_read(__u8 address)
467
{
514 jermar 468
    io_regsel_t regsel;
1 jermar 469
 
514 jermar 470
    regsel.value = io_apic[IOREGSEL];
471
    regsel.reg_addr = address;
472
    io_apic[IOREGSEL] = regsel.value;
1 jermar 473
    return io_apic[IOWIN];
474
}
475
 
514 jermar 476
/** Write to IO APIC register.
477
 *
478
 * @param address IO APIC register address.
479
 * @param Content to be written to the addressed IO APIC register.
480
 */
1 jermar 481
void io_apic_write(__u8 address, __u32 x)
482
{
514 jermar 483
    io_regsel_t regsel;
484
 
485
    regsel.value = io_apic[IOREGSEL];
486
    regsel.reg_addr = address;
487
    io_apic[IOREGSEL] = regsel.value;
1 jermar 488
    io_apic[IOWIN] = x;
489
}
490
 
514 jermar 491
/** Change some attributes of one item in I/O Redirection Table.
492
 *
493
 * @param pin IO APIC pin number.
494
 * @param dest Interrupt destination address.
495
 * @param v Interrupt vector to trigger.
496
 * @param flags Flags.
497
 */
498
void io_apic_change_ioredtbl(int pin, int dest, __u8 v, int flags)
1 jermar 499
{
512 jermar 500
    io_redirection_reg_t reg;
514 jermar 501
    int dlvr = DELMOD_FIXED;
1 jermar 502
 
503
    if (flags & LOPRI)
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        dlvr = DELMOD_LOWPRI;
505
 
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    reg.lo = io_apic_read(IOREDTBL + pin*2);
507
    reg.hi = io_apic_read(IOREDTBL + pin*2 + 1);
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    reg.dest = dest;
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    reg.destmod = DESTMOD_LOGIC;
511
    reg.trigger_mode = TRIGMOD_EDGE;
512
    reg.intpol = POLARITY_HIGH;
513
    reg.delmod = dlvr;
514
    reg.intvec = v;
1 jermar 515
 
514 jermar 516
    io_apic_write(IOREDTBL + pin*2, reg.lo);
517
    io_apic_write(IOREDTBL + pin*2 + 1, reg.hi);
1 jermar 518
}
519
 
514 jermar 520
/** Mask IRQs in IO APIC.
521
 *
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 * @param irqmask Bitmask of IRQs to be masked (0 = do not mask, 1 = mask).
523
 */
1 jermar 524
void io_apic_disable_irqs(__u16 irqmask)
525
{
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    io_redirection_reg_t reg;
527
    int i, pin;
1 jermar 528
 
529
    for (i=0;i<16;i++) {
515 jermar 530
        if (irqmask & (1<<i)) {
1 jermar 531
            /*
532
             * Mask the signal input in IO APIC if there is a
533
             * mapping for the respective IRQ number.
534
             */
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            pin = smp_irq_to_pin(i);
1 jermar 536
            if (pin != -1) {
512 jermar 537
                reg.lo = io_apic_read(IOREDTBL + pin*2);
538
                reg.masked = true;
539
                io_apic_write(IOREDTBL + pin*2, reg.lo);
1 jermar 540
            }
541
 
542
        }
543
    }
544
}
545
 
514 jermar 546
/** Unmask IRQs in IO APIC.
547
 *
548
 * @param irqmask Bitmask of IRQs to be unmasked (0 = do not unmask, 1 = unmask).
549
 */
1 jermar 550
void io_apic_enable_irqs(__u16 irqmask)
551
{
512 jermar 552
    int i, pin;
553
    io_redirection_reg_t reg;  
1 jermar 554
 
555
    for (i=0;i<16;i++) {
515 jermar 556
        if (irqmask & (1<<i)) {
1 jermar 557
            /*
558
             * Unmask the signal input in IO APIC if there is a
559
             * mapping for the respective IRQ number.
560
             */
512 jermar 561
            pin = smp_irq_to_pin(i);
1 jermar 562
            if (pin != -1) {
512 jermar 563
                reg.lo = io_apic_read(IOREDTBL + pin*2);
564
                reg.masked = false;
565
                io_apic_write(IOREDTBL + pin*2, reg.lo);
1 jermar 566
            }
567
 
568
        }
569
    }
570
}
571
 
458 decky 572
#endif /* CONFIG_SMP */