target-lm32/helper.c

   1 /*
   2  *  LatticeMico32 helper routines.
   3  *
   4  *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "cpu.h"
  21 #include "qemu/host-utils.h"
  22
  23 int cpu_lm32_handle_mmu_fault(CPULM32State *env, target_ulong address, int rw,
  24                               int mmu_idx)
  25 {
  26     int prot;
  27
  28     address &= TARGET_PAGE_MASK;
  29     prot = PAGE_BITS;
  30     if (env->flags & LM32_FLAG_IGNORE_MSB) {
  31         tlb_set_page(env, address, address & 0x7fffffff, prot, mmu_idx,
  32                 TARGET_PAGE_SIZE);
  33     } else {
  34         tlb_set_page(env, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
  35     }
  36
  37     return 0;
  38 }
  39
  40 hwaddr lm32_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
  41 {
  42     LM32CPU *cpu = LM32_CPU(cs);
  43
  44     addr &= TARGET_PAGE_MASK;
  45     if (cpu->env.flags & LM32_FLAG_IGNORE_MSB) {
  46         return addr & 0x7fffffff;
  47     } else {
  48         return addr;
  49     }
  50 }
  51
  52 void lm32_cpu_do_interrupt(CPUState *cs)
  53 {
  54     LM32CPU *cpu = LM32_CPU(cs);
  55     CPULM32State *env = &cpu->env;
  56
  57     qemu_log_mask(CPU_LOG_INT,
  58             "exception at pc=%x type=%x\n", env->pc, env->exception_index);
  59
  60     switch (env->exception_index) {
  61     case EXCP_INSN_BUS_ERROR:
  62     case EXCP_DATA_BUS_ERROR:
  63     case EXCP_DIVIDE_BY_ZERO:
  64     case EXCP_IRQ:
  65     case EXCP_SYSTEMCALL:
  66         /* non-debug exceptions */
  67         env->regs[R_EA] = env->pc;
  68         env->ie |= (env->ie & IE_IE) ? IE_EIE : 0;
  69         env->ie &= ~IE_IE;
  70         if (env->dc & DC_RE) {
  71             env->pc = env->deba + (env->exception_index * 32);
  72         } else {
  73             env->pc = env->eba + (env->exception_index * 32);
  74         }
  75         log_cpu_state_mask(CPU_LOG_INT, cs, 0);
  76         break;
  77     case EXCP_BREAKPOINT:
  78     case EXCP_WATCHPOINT:
  79         /* debug exceptions */
  80         env->regs[R_BA] = env->pc;
  81         env->ie |= (env->ie & IE_IE) ? IE_BIE : 0;
  82         env->ie &= ~IE_IE;
  83         env->pc = env->deba + (env->exception_index * 32);
  84         log_cpu_state_mask(CPU_LOG_INT, cs, 0);
  85         break;
  86     default:
  87         cpu_abort(env, "unhandled exception type=%d\n",
  88                   env->exception_index);
  89         break;
  90     }
  91 }
  92
  93 typedef struct {
  94     const char *name;
  95     uint32_t revision;
  96     uint8_t num_interrupts;
  97     uint8_t num_breakpoints;
  98     uint8_t num_watchpoints;
  99     uint32_t features;
 100 } LM32Def;
 101
 102 static const LM32Def lm32_defs[] = {
 103     {
 104         .name = "lm32-basic",
 105         .revision = 3,
 106         .num_interrupts = 32,
 107         .num_breakpoints = 4,
 108         .num_watchpoints = 4,
 109         .features = (LM32_FEATURE_SHIFT
 110                      | LM32_FEATURE_SIGN_EXTEND
 111                      | LM32_FEATURE_CYCLE_COUNT),
 112     },
 113     {
 114         .name = "lm32-standard",
 115         .revision = 3,
 116         .num_interrupts = 32,
 117         .num_breakpoints = 4,
 118         .num_watchpoints = 4,
 119         .features = (LM32_FEATURE_MULTIPLY
 120                      | LM32_FEATURE_DIVIDE
 121                      | LM32_FEATURE_SHIFT
 122                      | LM32_FEATURE_SIGN_EXTEND
 123                      | LM32_FEATURE_I_CACHE
 124                      | LM32_FEATURE_CYCLE_COUNT),
 125     },
 126     {
 127         .name = "lm32-full",
 128         .revision = 3,
 129         .num_interrupts = 32,
 130         .num_breakpoints = 4,
 131         .num_watchpoints = 4,
 132         .features = (LM32_FEATURE_MULTIPLY
 133                      | LM32_FEATURE_DIVIDE
 134                      | LM32_FEATURE_SHIFT
 135                      | LM32_FEATURE_SIGN_EXTEND
 136                      | LM32_FEATURE_I_CACHE
 137                      | LM32_FEATURE_D_CACHE
 138                      | LM32_FEATURE_CYCLE_COUNT),
 139     }
 140 };
 141
 142 void cpu_lm32_list(FILE *f, fprintf_function cpu_fprintf)
 143 {
 144     int i;
 145
 146     cpu_fprintf(f, "Available CPUs:\n");
 147     for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
 148         cpu_fprintf(f, "  %s\n", lm32_defs[i].name);
 149     }
 150 }
 151
 152 static const LM32Def *cpu_lm32_find_by_name(const char *name)
 153 {
 154     int i;
 155
 156     for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
 157         if (strcasecmp(name, lm32_defs[i].name) == 0) {
 158             return &lm32_defs[i];
 159         }
 160     }
 161
 162     return NULL;
 163 }
 164
 165 static uint32_t cfg_by_def(const LM32Def *def)
 166 {
 167     uint32_t cfg = 0;
 168
 169     if (def->features & LM32_FEATURE_MULTIPLY) {
 170         cfg |= CFG_M;
 171     }
 172
 173     if (def->features & LM32_FEATURE_DIVIDE) {
 174         cfg |= CFG_D;
 175     }
 176
 177     if (def->features & LM32_FEATURE_SHIFT) {
 178         cfg |= CFG_S;
 179     }
 180
 181     if (def->features & LM32_FEATURE_SIGN_EXTEND) {
 182         cfg |= CFG_X;
 183     }
 184
 185     if (def->features & LM32_FEATURE_I_CACHE) {
 186         cfg |= CFG_IC;
 187     }
 188
 189     if (def->features & LM32_FEATURE_D_CACHE) {
 190         cfg |= CFG_DC;
 191     }
 192
 193     if (def->features & LM32_FEATURE_CYCLE_COUNT) {
 194         cfg |= CFG_CC;
 195     }
 196
 197     cfg |= (def->num_interrupts << CFG_INT_SHIFT);
 198     cfg |= (def->num_breakpoints << CFG_BP_SHIFT);
 199     cfg |= (def->num_watchpoints << CFG_WP_SHIFT);
 200     cfg |= (def->revision << CFG_REV_SHIFT);
 201
 202     return cfg;
 203 }
 204
 205 LM32CPU *cpu_lm32_init(const char *cpu_model)
 206 {
 207     LM32CPU *cpu;
 208     CPULM32State *env;
 209     const LM32Def *def;
 210
 211     def = cpu_lm32_find_by_name(cpu_model);
 212     if (!def) {
 213         return NULL;
 214     }
 215
 216     cpu = LM32_CPU(object_new(TYPE_LM32_CPU));
 217     env = &cpu->env;
 218
 219     env->features = def->features;
 220     env->num_bps = def->num_breakpoints;
 221     env->num_wps = def->num_watchpoints;
 222     env->cfg = cfg_by_def(def);
 223
 224     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
 225
 226     return cpu;
 227 }
 228
 229 /* Some soc ignores the MSB on the address bus. Thus creating a shadow memory
 230  * area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
 231  * 0x80000000-0xffffffff is not cached and used to access IO devices. */
 232 void cpu_lm32_set_phys_msb_ignore(CPULM32State *env, int value)
 233 {
 234     if (value) {
 235         env->flags |= LM32_FLAG_IGNORE_MSB;
 236     } else {
 237         env->flags &= ~LM32_FLAG_IGNORE_MSB;
 238     }
 239 }