target/xtensa/op_helper.c

   1 /*
   2  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   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 are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "cpu.h"
  30 #include "exec/helper-proto.h"
  31 #include "qemu/host-utils.h"
  32 #include "exec/exec-all.h"
  33 #include "qemu/atomic.h"
  34 #include "qemu/timer.h"
  35
  36 #ifndef CONFIG_USER_ONLY
  37
  38 void HELPER(update_ccount)(CPUXtensaState *env)
  39 {
  40     XtensaCPU *cpu = env_archcpu(env);
  41     uint64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
  42
  43     env->ccount_time = now;
  44     env->sregs[CCOUNT] = env->ccount_base +
  45         (uint32_t)clock_ns_to_ticks(cpu->clock, now - env->time_base);
  46 }
  47
  48 void HELPER(wsr_ccount)(CPUXtensaState *env, uint32_t v)
  49 {
  50     int i;
  51
  52     HELPER(update_ccount)(env);
  53     env->ccount_base += v - env->sregs[CCOUNT];
  54     for (i = 0; i < env->config->nccompare; ++i) {
  55         HELPER(update_ccompare)(env, i);
  56     }
  57 }
  58
  59 void HELPER(update_ccompare)(CPUXtensaState *env, uint32_t i)
  60 {
  61     XtensaCPU *cpu = env_archcpu(env);
  62     uint64_t dcc;
  63
  64     qatomic_and(&env->sregs[INTSET],
  65                ~(1u << env->config->timerint[i]));
  66     HELPER(update_ccount)(env);
  67     dcc = (uint64_t)(env->sregs[CCOMPARE + i] - env->sregs[CCOUNT] - 1) + 1;
  68     timer_mod(env->ccompare[i].timer,
  69               env->ccount_time + clock_ticks_to_ns(cpu->clock, dcc));
  70     env->yield_needed = 1;
  71 }
  72
  73 /*!
  74  * Check vaddr accessibility/cache attributes and raise an exception if
  75  * specified by the ATOMCTL SR.
  76  *
  77  * Note: local memory exclusion is not implemented
  78  */
  79 void HELPER(check_atomctl)(CPUXtensaState *env, uint32_t pc, uint32_t vaddr)
  80 {
  81     uint32_t paddr, page_size, access;
  82     uint32_t atomctl = env->sregs[ATOMCTL];
  83     int rc = xtensa_get_physical_addr(env, true, vaddr, 1,
  84             xtensa_get_cring(env), &paddr, &page_size, &access);
  85
  86     /*
  87      * s32c1i never causes LOAD_PROHIBITED_CAUSE exceptions,
  88      * see opcode description in the ISA
  89      */
  90     if (rc == 0 &&
  91             (access & (PAGE_READ | PAGE_WRITE)) != (PAGE_READ | PAGE_WRITE)) {
  92         rc = STORE_PROHIBITED_CAUSE;
  93     }
  94
  95     if (rc) {
  96         HELPER(exception_cause_vaddr)(env, pc, rc, vaddr);
  97     }
  98
  99     /*
 100      * When data cache is not configured use ATOMCTL bypass field.
 101      * See ISA, 4.3.12.4 The Atomic Operation Control Register (ATOMCTL)
 102      * under the Conditional Store Option.
 103      */
 104     if (!xtensa_option_enabled(env->config, XTENSA_OPTION_DCACHE)) {
 105         access = PAGE_CACHE_BYPASS;
 106     }
 107
 108     switch (access & PAGE_CACHE_MASK) {
 109     case PAGE_CACHE_WB:
 110         atomctl >>= 2;
 111         /* fall through */
 112     case PAGE_CACHE_WT:
 113         atomctl >>= 2;
 114         /* fall through */
 115     case PAGE_CACHE_BYPASS:
 116         if ((atomctl & 0x3) == 0) {
 117             HELPER(exception_cause_vaddr)(env, pc,
 118                     LOAD_STORE_ERROR_CAUSE, vaddr);
 119         }
 120         break;
 121
 122     case PAGE_CACHE_ISOLATE:
 123         HELPER(exception_cause_vaddr)(env, pc,
 124                 LOAD_STORE_ERROR_CAUSE, vaddr);
 125         break;
 126
 127     default:
 128         break;
 129     }
 130 }
 131
 132 void HELPER(check_exclusive)(CPUXtensaState *env, uint32_t pc, uint32_t vaddr,
 133                              uint32_t is_write)
 134 {
 135     uint32_t paddr, page_size, access;
 136     uint32_t atomctl = env->sregs[ATOMCTL];
 137     int rc = xtensa_get_physical_addr(env, true, vaddr, is_write,
 138                                       xtensa_get_cring(env), &paddr,
 139                                       &page_size, &access);
 140
 141     if (rc) {
 142         HELPER(exception_cause_vaddr)(env, pc, rc, vaddr);
 143     }
 144
 145     /* When data cache is not configured use ATOMCTL bypass field. */
 146     if (!xtensa_option_enabled(env->config, XTENSA_OPTION_DCACHE)) {
 147         access = PAGE_CACHE_BYPASS;
 148     }
 149
 150     switch (access & PAGE_CACHE_MASK) {
 151     case PAGE_CACHE_WB:
 152         atomctl >>= 2;
 153         /* fall through */
 154     case PAGE_CACHE_WT:
 155         atomctl >>= 2;
 156         /* fall through */
 157     case PAGE_CACHE_BYPASS:
 158         if ((atomctl & 0x3) == 0) {
 159             HELPER(exception_cause_vaddr)(env, pc,
 160                                           EXCLUSIVE_ERROR_CAUSE, vaddr);
 161         }
 162         break;
 163
 164     case PAGE_CACHE_ISOLATE:
 165         HELPER(exception_cause_vaddr)(env, pc,
 166                 LOAD_STORE_ERROR_CAUSE, vaddr);
 167         break;
 168
 169     default:
 170         break;
 171     }
 172 }
 173
 174 void HELPER(wsr_memctl)(CPUXtensaState *env, uint32_t v)
 175 {
 176     if (xtensa_option_enabled(env->config, XTENSA_OPTION_ICACHE)) {
 177         if (extract32(v, MEMCTL_IUSEWAYS_SHIFT, MEMCTL_IUSEWAYS_LEN) >
 178             env->config->icache_ways) {
 179             deposit32(v, MEMCTL_IUSEWAYS_SHIFT, MEMCTL_IUSEWAYS_LEN,
 180                       env->config->icache_ways);
 181         }
 182     }
 183     if (xtensa_option_enabled(env->config, XTENSA_OPTION_DCACHE)) {
 184         if (extract32(v, MEMCTL_DUSEWAYS_SHIFT, MEMCTL_DUSEWAYS_LEN) >
 185             env->config->dcache_ways) {
 186             deposit32(v, MEMCTL_DUSEWAYS_SHIFT, MEMCTL_DUSEWAYS_LEN,
 187                       env->config->dcache_ways);
 188         }
 189         if (extract32(v, MEMCTL_DALLOCWAYS_SHIFT, MEMCTL_DALLOCWAYS_LEN) >
 190             env->config->dcache_ways) {
 191             deposit32(v, MEMCTL_DALLOCWAYS_SHIFT, MEMCTL_DALLOCWAYS_LEN,
 192                       env->config->dcache_ways);
 193         }
 194     }
 195     env->sregs[MEMCTL] = v & env->config->memctl_mask;
 196 }
 197
 198 #endif
 199
 200 uint32_t HELPER(rer)(CPUXtensaState *env, uint32_t addr)
 201 {
 202 #ifndef CONFIG_USER_ONLY
 203     return address_space_ldl(env->address_space_er, addr,
 204                              MEMTXATTRS_UNSPECIFIED, NULL);
 205 #else
 206     return 0;
 207 #endif
 208 }
 209
 210 void HELPER(wer)(CPUXtensaState *env, uint32_t data, uint32_t addr)
 211 {
 212 #ifndef CONFIG_USER_ONLY
 213     address_space_stl(env->address_space_er, addr, data,
 214                       MEMTXATTRS_UNSPECIFIED, NULL);
 215 #endif
 216 }