hw/sparc64/sparc64.c

   1 /*
   2  * QEMU Sun4u/Sun4v System Emulator common routines
   3  *
   4  * Copyright (c) 2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25
  26 #include "qemu/osdep.h"
  27 #include "cpu.h"
  28 #include "hw/char/serial.h"
  29 #include "hw/sparc/sparc64.h"
  30 #include "qemu/timer.h"
  31
  32
  33 //#define DEBUG_IRQ
  34 //#define DEBUG_TIMER
  35
  36 #ifdef DEBUG_IRQ
  37 #define CPUIRQ_DPRINTF(fmt, ...)                                \
  38     do { printf("CPUIRQ: " fmt , ## __VA_ARGS__); } while (0)
  39 #else
  40 #define CPUIRQ_DPRINTF(fmt, ...)
  41 #endif
  42
  43 #ifdef DEBUG_TIMER
  44 #define TIMER_DPRINTF(fmt, ...)                                  \
  45     do { printf("TIMER: " fmt , ## __VA_ARGS__); } while (0)
  46 #else
  47 #define TIMER_DPRINTF(fmt, ...)
  48 #endif
  49
  50 #define TICK_MAX             0x7fffffffffffffffULL
  51
  52 void cpu_check_irqs(CPUSPARCState *env)
  53 {
  54     CPUState *cs;
  55     uint32_t pil = env->pil_in |
  56                   (env->softint & ~(SOFTINT_TIMER | SOFTINT_STIMER));
  57
  58     /* We should be holding the BQL before we mess with IRQs */
  59     g_assert(qemu_mutex_iothread_locked());
  60
  61     /* TT_IVEC has a higher priority (16) than TT_EXTINT (31..17) */
  62     if (env->ivec_status & 0x20) {
  63         return;
  64     }
  65     cs = CPU(sparc_env_get_cpu(env));
  66     /* check if TM or SM in SOFTINT are set
  67        setting these also causes interrupt 14 */
  68     if (env->softint & (SOFTINT_TIMER | SOFTINT_STIMER)) {
  69         pil |= 1 << 14;
  70     }
  71
  72     /* The bit corresponding to psrpil is (1<< psrpil), the next bit
  73        is (2 << psrpil). */
  74     if (pil < (2 << env->psrpil)) {
  75         if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
  76             CPUIRQ_DPRINTF("Reset CPU IRQ (current interrupt %x)\n",
  77                            env->interrupt_index);
  78             env->interrupt_index = 0;
  79             cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  80         }
  81         return;
  82     }
  83
  84     if (cpu_interrupts_enabled(env)) {
  85
  86         unsigned int i;
  87
  88         for (i = 15; i > env->psrpil; i--) {
  89             if (pil & (1 << i)) {
  90                 int old_interrupt = env->interrupt_index;
  91                 int new_interrupt = TT_EXTINT | i;
  92
  93                 if (unlikely(env->tl > 0 && cpu_tsptr(env)->tt > new_interrupt
  94                   && ((cpu_tsptr(env)->tt & 0x1f0) == TT_EXTINT))) {
  95                     CPUIRQ_DPRINTF("Not setting CPU IRQ: TL=%d "
  96                                    "current %x >= pending %x\n",
  97                                    env->tl, cpu_tsptr(env)->tt, new_interrupt);
  98                 } else if (old_interrupt != new_interrupt) {
  99                     env->interrupt_index = new_interrupt;
 100                     CPUIRQ_DPRINTF("Set CPU IRQ %d old=%x new=%x\n", i,
 101                                    old_interrupt, new_interrupt);
 102                     cpu_interrupt(cs, CPU_INTERRUPT_HARD);
 103                 }
 104                 break;
 105             }
 106         }
 107     } else if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
 108         CPUIRQ_DPRINTF("Interrupts disabled, pil=%08x pil_in=%08x softint=%08x "
 109                        "current interrupt %x\n",
 110                        pil, env->pil_in, env->softint, env->interrupt_index);
 111         env->interrupt_index = 0;
 112         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
 113     }
 114 }
 115
 116 static void cpu_kick_irq(SPARCCPU *cpu)
 117 {
 118     CPUState *cs = CPU(cpu);
 119     CPUSPARCState *env = &cpu->env;
 120
 121     cs->halted = 0;
 122     cpu_check_irqs(env);
 123     qemu_cpu_kick(cs);
 124 }
 125
 126 void sparc64_cpu_set_ivec_irq(void *opaque, int irq, int level)
 127 {
 128     SPARCCPU *cpu = opaque;
 129     CPUSPARCState *env = &cpu->env;
 130     CPUState *cs;
 131
 132     if (level) {
 133         if (!(env->ivec_status & 0x20)) {
 134             CPUIRQ_DPRINTF("Raise IVEC IRQ %d\n", irq);
 135             cs = CPU(cpu);
 136             cs->halted = 0;
 137             env->interrupt_index = TT_IVEC;
 138             env->ivec_status |= 0x20;
 139             env->ivec_data[0] = (0x1f << 6) | irq;
 140             env->ivec_data[1] = 0;
 141             env->ivec_data[2] = 0;
 142             cpu_interrupt(cs, CPU_INTERRUPT_HARD);
 143         }
 144     } else {
 145         if (env->ivec_status & 0x20) {
 146             CPUIRQ_DPRINTF("Lower IVEC IRQ %d\n", irq);
 147             cs = CPU(cpu);
 148             env->ivec_status &= ~0x20;
 149             cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
 150         }
 151     }
 152 }
 153
 154 typedef struct ResetData {
 155     SPARCCPU *cpu;
 156     uint64_t prom_addr;
 157 } ResetData;
 158
 159 static CPUTimer *cpu_timer_create(const char *name, SPARCCPU *cpu,
 160                                   QEMUBHFunc *cb, uint32_t frequency,
 161                                   uint64_t disabled_mask, uint64_t npt_mask)
 162 {
 163     CPUTimer *timer = g_malloc0(sizeof(CPUTimer));
 164
 165     timer->name = name;
 166     timer->frequency = frequency;
 167     timer->disabled_mask = disabled_mask;
 168     timer->npt_mask = npt_mask;
 169
 170     timer->disabled = 1;
 171     timer->npt = 1;
 172     timer->clock_offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 173
 174     timer->qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL, cb, cpu);
 175
 176     return timer;
 177 }
 178
 179 static void cpu_timer_reset(CPUTimer *timer)
 180 {
 181     timer->disabled = 1;
 182     timer->clock_offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 183
 184     timer_del(timer->qtimer);
 185 }
 186
 187 static void main_cpu_reset(void *opaque)
 188 {
 189     ResetData *s = (ResetData *)opaque;
 190     CPUSPARCState *env = &s->cpu->env;
 191     static unsigned int nr_resets;
 192
 193     cpu_reset(CPU(s->cpu));
 194
 195     cpu_timer_reset(env->tick);
 196     cpu_timer_reset(env->stick);
 197     cpu_timer_reset(env->hstick);
 198
 199     env->gregs[1] = 0; /* Memory start */
 200     env->gregs[2] = ram_size; /* Memory size */
 201     env->gregs[3] = 0; /* Machine description XXX */
 202     if (nr_resets++ == 0) {
 203         /* Power on reset */
 204         env->pc = s->prom_addr + 0x20ULL;
 205     } else {
 206         env->pc = s->prom_addr + 0x40ULL;
 207     }
 208     env->npc = env->pc + 4;
 209 }
 210
 211 static void tick_irq(void *opaque)
 212 {
 213     SPARCCPU *cpu = opaque;
 214     CPUSPARCState *env = &cpu->env;
 215
 216     CPUTimer *timer = env->tick;
 217
 218     if (timer->disabled) {
 219         CPUIRQ_DPRINTF("tick_irq: softint disabled\n");
 220         return;
 221     } else {
 222         CPUIRQ_DPRINTF("tick: fire\n");
 223     }
 224
 225     env->softint |= SOFTINT_TIMER;
 226     cpu_kick_irq(cpu);
 227 }
 228
 229 static void stick_irq(void *opaque)
 230 {
 231     SPARCCPU *cpu = opaque;
 232     CPUSPARCState *env = &cpu->env;
 233
 234     CPUTimer *timer = env->stick;
 235
 236     if (timer->disabled) {
 237         CPUIRQ_DPRINTF("stick_irq: softint disabled\n");
 238         return;
 239     } else {
 240         CPUIRQ_DPRINTF("stick: fire\n");
 241     }
 242
 243     env->softint |= SOFTINT_STIMER;
 244     cpu_kick_irq(cpu);
 245 }
 246
 247 static void hstick_irq(void *opaque)
 248 {
 249     SPARCCPU *cpu = opaque;
 250     CPUSPARCState *env = &cpu->env;
 251
 252     CPUTimer *timer = env->hstick;
 253
 254     if (timer->disabled) {
 255         CPUIRQ_DPRINTF("hstick_irq: softint disabled\n");
 256         return;
 257     } else {
 258         CPUIRQ_DPRINTF("hstick: fire\n");
 259     }
 260
 261     env->softint |= SOFTINT_STIMER;
 262     cpu_kick_irq(cpu);
 263 }
 264
 265 static int64_t cpu_to_timer_ticks(int64_t cpu_ticks, uint32_t frequency)
 266 {
 267     return muldiv64(cpu_ticks, NANOSECONDS_PER_SECOND, frequency);
 268 }
 269
 270 static uint64_t timer_to_cpu_ticks(int64_t timer_ticks, uint32_t frequency)
 271 {
 272     return muldiv64(timer_ticks, frequency, NANOSECONDS_PER_SECOND);
 273 }
 274
 275 void cpu_tick_set_count(CPUTimer *timer, uint64_t count)
 276 {
 277     uint64_t real_count = count & ~timer->npt_mask;
 278     uint64_t npt_bit = count & timer->npt_mask;
 279
 280     int64_t vm_clock_offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
 281                     cpu_to_timer_ticks(real_count, timer->frequency);
 282
 283     TIMER_DPRINTF("%s set_count count=0x%016lx (npt %s) p=%p\n",
 284                   timer->name, real_count,
 285                   timer->npt ? "disabled" : "enabled", timer);
 286
 287     timer->npt = npt_bit ? 1 : 0;
 288     timer->clock_offset = vm_clock_offset;
 289 }
 290
 291 uint64_t cpu_tick_get_count(CPUTimer *timer)
 292 {
 293     uint64_t real_count = timer_to_cpu_ticks(
 294                     qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - timer->clock_offset,
 295                     timer->frequency);
 296
 297     TIMER_DPRINTF("%s get_count count=0x%016lx (npt %s) p=%p\n",
 298            timer->name, real_count,
 299            timer->npt ? "disabled" : "enabled", timer);
 300
 301     if (timer->npt) {
 302         real_count |= timer->npt_mask;
 303     }
 304
 305     return real_count;
 306 }
 307
 308 void cpu_tick_set_limit(CPUTimer *timer, uint64_t limit)
 309 {
 310     int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 311
 312     uint64_t real_limit = limit & ~timer->disabled_mask;
 313     timer->disabled = (limit & timer->disabled_mask) ? 1 : 0;
 314
 315     int64_t expires = cpu_to_timer_ticks(real_limit, timer->frequency) +
 316                     timer->clock_offset;
 317
 318     if (expires < now) {
 319         expires = now + 1;
 320     }
 321
 322     TIMER_DPRINTF("%s set_limit limit=0x%016lx (%s) p=%p "
 323                   "called with limit=0x%016lx at 0x%016lx (delta=0x%016lx)\n",
 324                   timer->name, real_limit,
 325                   timer->disabled ? "disabled" : "enabled",
 326                   timer, limit,
 327                   timer_to_cpu_ticks(now - timer->clock_offset,
 328                                      timer->frequency),
 329                   timer_to_cpu_ticks(expires - now, timer->frequency));
 330
 331     if (!real_limit) {
 332         TIMER_DPRINTF("%s set_limit limit=ZERO - not starting timer\n",
 333                 timer->name);
 334         timer_del(timer->qtimer);
 335     } else if (timer->disabled) {
 336         timer_del(timer->qtimer);
 337     } else {
 338         timer_mod(timer->qtimer, expires);
 339     }
 340 }
 341
 342 SPARCCPU *sparc64_cpu_devinit(const char *cpu_model,
 343                               const char *default_cpu_model, uint64_t prom_addr)
 344 {
 345     SPARCCPU *cpu;
 346     CPUSPARCState *env;
 347     ResetData *reset_info;
 348
 349     uint32_t   tick_frequency = 100 * 1000000;
 350     uint32_t  stick_frequency = 100 * 1000000;
 351     uint32_t hstick_frequency = 100 * 1000000;
 352
 353     if (cpu_model == NULL) {
 354         cpu_model = default_cpu_model;
 355     }
 356     cpu = SPARC_CPU(cpu_generic_init(TYPE_SPARC_CPU, cpu_model));
 357     env = &cpu->env;
 358
 359     env->tick = cpu_timer_create("tick", cpu, tick_irq,
 360                                   tick_frequency, TICK_INT_DIS,
 361                                   TICK_NPT_MASK);
 362
 363     env->stick = cpu_timer_create("stick", cpu, stick_irq,
 364                                    stick_frequency, TICK_INT_DIS,
 365                                    TICK_NPT_MASK);
 366
 367     env->hstick = cpu_timer_create("hstick", cpu, hstick_irq,
 368                                     hstick_frequency, TICK_INT_DIS,
 369                                     TICK_NPT_MASK);
 370
 371     reset_info = g_malloc0(sizeof(ResetData));
 372     reset_info->cpu = cpu;
 373     reset_info->prom_addr = prom_addr;
 374     qemu_register_reset(main_cpu_reset, reset_info);
 375
 376     return cpu;
 377 }