summaryrefslogtreecommitdiff
blob: dffa11539acd6cb90599d45d15265c97ca17cced (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
/*
 * QEMU Sparc SLAVIO interrupt controller emulation
 *
 * Copyright (c) 2003-2005 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "hw.h"
#include "sun4m.h"
#include "monitor.h"

//#define DEBUG_IRQ_COUNT
//#define DEBUG_IRQ

#ifdef DEBUG_IRQ
#define DPRINTF(fmt, args...) \
do { printf("IRQ: " fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...)
#endif

/*
 * Registers of interrupt controller in sun4m.
 *
 * This is the interrupt controller part of chip STP2001 (Slave I/O), also
 * produced as NCR89C105. See
 * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
 *
 * There is a system master controller and one for each cpu.
 *
 */

#define MAX_CPUS 16
#define MAX_PILS 16

struct SLAVIO_CPUINTCTLState;

typedef struct SLAVIO_INTCTLState {
    uint32_t intregm_pending;
    uint32_t intregm_disabled;
    uint32_t target_cpu;
#ifdef DEBUG_IRQ_COUNT
    uint64_t irq_count[32];
#endif
    qemu_irq *cpu_irqs[MAX_CPUS];
    const uint32_t *intbit_to_level;
    uint32_t cputimer_lbit, cputimer_mbit;
    uint32_t pil_out[MAX_CPUS];
    struct SLAVIO_CPUINTCTLState *slaves[MAX_CPUS];
} SLAVIO_INTCTLState;

typedef struct SLAVIO_CPUINTCTLState {
    uint32_t intreg_pending;
    SLAVIO_INTCTLState *master;
    uint32_t cpu;
} SLAVIO_CPUINTCTLState;

#define INTCTL_MAXADDR 0xf
#define INTCTL_SIZE (INTCTL_MAXADDR + 1)
#define INTCTLM_SIZE 0x14
#define MASTER_IRQ_MASK ~0x0fa2007f
#define MASTER_DISABLE 0x80000000
#define CPU_SOFTIRQ_MASK 0xfffe0000
#define CPU_HARDIRQ_MASK 0x0000fffe
#define CPU_IRQ_INT15_IN 0x0004000
#define CPU_IRQ_INT15_MASK 0x80000000

static void slavio_check_interrupts(SLAVIO_INTCTLState *s);

// per-cpu interrupt controller
static uint32_t slavio_intctl_mem_readl(void *opaque, target_phys_addr_t addr)
{
    SLAVIO_CPUINTCTLState *s = opaque;
    uint32_t saddr, ret;

    saddr = addr >> 2;
    switch (saddr) {
    case 0:
        ret = s->intreg_pending;
        break;
    default:
        ret = 0;
        break;
    }
    DPRINTF("read cpu %d reg 0x" TARGET_FMT_plx " = %x\n", s->cpu, addr, ret);

    return ret;
}

static void slavio_intctl_mem_writel(void *opaque, target_phys_addr_t addr,
                                     uint32_t val)
{
    SLAVIO_CPUINTCTLState *s = opaque;
    uint32_t saddr;

    saddr = addr >> 2;
    DPRINTF("write cpu %d reg 0x" TARGET_FMT_plx " = %x\n", s->cpu, addr, val);
    switch (saddr) {
    case 1: // clear pending softints
        if (val & CPU_IRQ_INT15_IN)
            val |= CPU_IRQ_INT15_MASK;
        val &= CPU_SOFTIRQ_MASK;
        s->intreg_pending &= ~val;
        slavio_check_interrupts(s->master);
        DPRINTF("Cleared cpu %d irq mask %x, curmask %x\n", s->cpu, val,
                s->intreg_pending);
        break;
    case 2: // set softint
        val &= CPU_SOFTIRQ_MASK;
        s->intreg_pending |= val;
        slavio_check_interrupts(s->master);
        DPRINTF("Set cpu %d irq mask %x, curmask %x\n", s->cpu, val,
                s->intreg_pending);
        break;
    default:
        break;
    }
}

static CPUReadMemoryFunc *slavio_intctl_mem_read[3] = {
    NULL,
    NULL,
    slavio_intctl_mem_readl,
};

static CPUWriteMemoryFunc *slavio_intctl_mem_write[3] = {
    NULL,
    NULL,
    slavio_intctl_mem_writel,
};

// master system interrupt controller
static uint32_t slavio_intctlm_mem_readl(void *opaque, target_phys_addr_t addr)
{
    SLAVIO_INTCTLState *s = opaque;
    uint32_t saddr, ret;

    saddr = addr >> 2;
    switch (saddr) {
    case 0:
        ret = s->intregm_pending & ~MASTER_DISABLE;
        break;
    case 1:
        ret = s->intregm_disabled & MASTER_IRQ_MASK;
        break;
    case 4:
        ret = s->target_cpu;
        break;
    default:
        ret = 0;
        break;
    }
    DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);

    return ret;
}

static void slavio_intctlm_mem_writel(void *opaque, target_phys_addr_t addr,
                                      uint32_t val)
{
    SLAVIO_INTCTLState *s = opaque;
    uint32_t saddr;

    saddr = addr >> 2;
    DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
    switch (saddr) {
    case 2: // clear (enable)
        // Force clear unused bits
        val &= MASTER_IRQ_MASK;
        s->intregm_disabled &= ~val;
        DPRINTF("Enabled master irq mask %x, curmask %x\n", val,
                s->intregm_disabled);
        slavio_check_interrupts(s);
        break;
    case 3: // set (disable, clear pending)
        // Force clear unused bits
        val &= MASTER_IRQ_MASK;
        s->intregm_disabled |= val;
        s->intregm_pending &= ~val;
        slavio_check_interrupts(s);
        DPRINTF("Disabled master irq mask %x, curmask %x\n", val,
                s->intregm_disabled);
        break;
    case 4:
        s->target_cpu = val & (MAX_CPUS - 1);
        slavio_check_interrupts(s);
        DPRINTF("Set master irq cpu %d\n", s->target_cpu);
        break;
    default:
        break;
    }
}

static CPUReadMemoryFunc *slavio_intctlm_mem_read[3] = {
    NULL,
    NULL,
    slavio_intctlm_mem_readl,
};

static CPUWriteMemoryFunc *slavio_intctlm_mem_write[3] = {
    NULL,
    NULL,
    slavio_intctlm_mem_writel,
};

void slavio_pic_info(Monitor *mon, void *opaque)
{
    SLAVIO_INTCTLState *s = opaque;
    int i;

    for (i = 0; i < MAX_CPUS; i++) {
        monitor_printf(mon, "per-cpu %d: pending 0x%08x\n", i,
                       s->slaves[i]->intreg_pending);
    }
    monitor_printf(mon, "master: pending 0x%08x, disabled 0x%08x\n",
                   s->intregm_pending, s->intregm_disabled);
}

void slavio_irq_info(Monitor *mon, void *opaque)
{
#ifndef DEBUG_IRQ_COUNT
    monitor_printf(mon, "irq statistic code not compiled.\n");
#else
    SLAVIO_INTCTLState *s = opaque;
    int i;
    int64_t count;

    monitor_printf(mon, "IRQ statistics:\n");
    for (i = 0; i < 32; i++) {
        count = s->irq_count[i];
        if (count > 0)
            monitor_printf(mon, "%2d: %" PRId64 "\n", i, count);
    }
#endif
}

static void slavio_check_interrupts(SLAVIO_INTCTLState *s)
{
    uint32_t pending = s->intregm_pending, pil_pending;
    unsigned int i, j;

    pending &= ~s->intregm_disabled;

    DPRINTF("pending %x disabled %x\n", pending, s->intregm_disabled);
    for (i = 0; i < MAX_CPUS; i++) {
        pil_pending = 0;
        if (pending && !(s->intregm_disabled & MASTER_DISABLE) &&
            (i == s->target_cpu)) {
            for (j = 0; j < 32; j++) {
                if (pending & (1 << j))
                    pil_pending |= 1 << s->intbit_to_level[j];
            }
        }
        pil_pending |= (s->slaves[i]->intreg_pending & CPU_SOFTIRQ_MASK) >> 16;

        for (j = 0; j < MAX_PILS; j++) {
            if (pil_pending & (1 << j)) {
                if (!(s->pil_out[i] & (1 << j)))
                    qemu_irq_raise(s->cpu_irqs[i][j]);
            } else {
                if (s->pil_out[i] & (1 << j))
                    qemu_irq_lower(s->cpu_irqs[i][j]);
            }
        }
        s->pil_out[i] = pil_pending;
    }
}

/*
 * "irq" here is the bit number in the system interrupt register to
 * separate serial and keyboard interrupts sharing a level.
 */
static void slavio_set_irq(void *opaque, int irq, int level)
{
    SLAVIO_INTCTLState *s = opaque;
    uint32_t mask = 1 << irq;
    uint32_t pil = s->intbit_to_level[irq];

    DPRINTF("Set cpu %d irq %d -> pil %d level %d\n", s->target_cpu, irq, pil,
            level);
    if (pil > 0) {
        if (level) {
#ifdef DEBUG_IRQ_COUNT
            s->irq_count[pil]++;
#endif
            s->intregm_pending |= mask;
            s->slaves[s->target_cpu]->intreg_pending |= 1 << pil;
        } else {
            s->intregm_pending &= ~mask;
            s->slaves[s->target_cpu]->intreg_pending &= ~(1 << pil);
        }
        slavio_check_interrupts(s);
    }
}

static void slavio_set_timer_irq_cpu(void *opaque, int cpu, int level)
{
    SLAVIO_INTCTLState *s = opaque;

    DPRINTF("Set cpu %d local timer level %d\n", cpu, level);

    if (level) {
        s->intregm_pending |= s->cputimer_mbit;
        s->slaves[cpu]->intreg_pending |= s->cputimer_lbit;
    } else {
        s->intregm_pending &= ~s->cputimer_mbit;
        s->slaves[cpu]->intreg_pending &= ~s->cputimer_lbit;
    }

    slavio_check_interrupts(s);
}

static void slavio_intctl_save(QEMUFile *f, void *opaque)
{
    SLAVIO_INTCTLState *s = opaque;
    int i;

    for (i = 0; i < MAX_CPUS; i++) {
        qemu_put_be32s(f, &s->slaves[i]->intreg_pending);
    }
    qemu_put_be32s(f, &s->intregm_pending);
    qemu_put_be32s(f, &s->intregm_disabled);
    qemu_put_be32s(f, &s->target_cpu);
}

static int slavio_intctl_load(QEMUFile *f, void *opaque, int version_id)
{
    SLAVIO_INTCTLState *s = opaque;
    int i;

    if (version_id != 1)
        return -EINVAL;

    for (i = 0; i < MAX_CPUS; i++) {
        qemu_get_be32s(f, &s->slaves[i]->intreg_pending);
    }
    qemu_get_be32s(f, &s->intregm_pending);
    qemu_get_be32s(f, &s->intregm_disabled);
    qemu_get_be32s(f, &s->target_cpu);
    slavio_check_interrupts(s);
    return 0;
}

static void slavio_intctl_reset(void *opaque)
{
    SLAVIO_INTCTLState *s = opaque;
    int i;

    for (i = 0; i < MAX_CPUS; i++) {
        s->slaves[i]->intreg_pending = 0;
    }
    s->intregm_disabled = ~MASTER_IRQ_MASK;
    s->intregm_pending = 0;
    s->target_cpu = 0;
    slavio_check_interrupts(s);
}

void *slavio_intctl_init(target_phys_addr_t addr, target_phys_addr_t addrg,
                         const uint32_t *intbit_to_level,
                         qemu_irq **irq, qemu_irq **cpu_irq,
                         qemu_irq **parent_irq, unsigned int cputimer)
{
    int slavio_intctl_io_memory, slavio_intctlm_io_memory, i;
    SLAVIO_INTCTLState *s;
    SLAVIO_CPUINTCTLState *slave;

    s = qemu_mallocz(sizeof(SLAVIO_INTCTLState));

    s->intbit_to_level = intbit_to_level;
    for (i = 0; i < MAX_CPUS; i++) {
        slave = qemu_mallocz(sizeof(SLAVIO_CPUINTCTLState));

        slave->cpu = i;
        slave->master = s;

        slavio_intctl_io_memory = cpu_register_io_memory(0,
                                                         slavio_intctl_mem_read,
                                                         slavio_intctl_mem_write,
                                                         slave);
        cpu_register_physical_memory(addr + i * TARGET_PAGE_SIZE, INTCTL_SIZE,
                                     slavio_intctl_io_memory);

        s->slaves[i] = slave;
        s->cpu_irqs[i] = parent_irq[i];
    }

    slavio_intctlm_io_memory = cpu_register_io_memory(0,
                                                      slavio_intctlm_mem_read,
                                                      slavio_intctlm_mem_write,
                                                      s);
    cpu_register_physical_memory(addrg, INTCTLM_SIZE, slavio_intctlm_io_memory);

    register_savevm("slavio_intctl", addr, 1, slavio_intctl_save,
                    slavio_intctl_load, s);
    qemu_register_reset(slavio_intctl_reset, s);
    *irq = qemu_allocate_irqs(slavio_set_irq, s, 32);

    *cpu_irq = qemu_allocate_irqs(slavio_set_timer_irq_cpu, s, MAX_CPUS);
    s->cputimer_mbit = 1 << cputimer;
    s->cputimer_lbit = 1 << intbit_to_level[cputimer];
    slavio_intctl_reset(s);
    return s;
}