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 cpu_get_phys_page_debug(CPULM32State *env, target_ulong addr)
  41 {
  42     addr &= TARGET_PAGE_MASK;
  43     if (env->flags & LM32_FLAG_IGNORE_MSB) {
  44         return addr & 0x7fffffff;
  45     } else {
  46         return addr;
  47     }
  48 }
  49
  50 void lm32_cpu_do_interrupt(CPUState *cs)
  51 {
  52     LM32CPU *cpu = LM32_CPU(cs);
  53     CPULM32State *env = &cpu->env;
  54
  55     qemu_log_mask(CPU_LOG_INT,
  56             "exception at pc=%x type=%x\n", env->pc, env->exception_index);
  57
  58     switch (env->exception_index) {
  59     case EXCP_INSN_BUS_ERROR:
  60     case EXCP_DATA_BUS_ERROR:
  61     case EXCP_DIVIDE_BY_ZERO:
  62     case EXCP_IRQ:
  63     case EXCP_SYSTEMCALL:
  64         /* non-debug exceptions */
  65         env->regs[R_EA] = env->pc;
  66         env->ie |= (env->ie & IE_IE) ? IE_EIE : 0;
  67         env->ie &= ~IE_IE;
  68         if (env->dc & DC_RE) {
  69             env->pc = env->deba + (env->exception_index * 32);
  70         } else {
  71             env->pc = env->eba + (env->exception_index * 32);
  72         }
  73         log_cpu_state_mask(CPU_LOG_INT, cs, 0);
  74         break;
  75     case EXCP_BREAKPOINT:
  76     case EXCP_WATCHPOINT:
  77         /* debug exceptions */
  78         env->regs[R_BA] = env->pc;
  79         env->ie |= (env->ie & IE_IE) ? IE_BIE : 0;
  80         env->ie &= ~IE_IE;
  81         env->pc = env->deba + (env->exception_index * 32);
  82         log_cpu_state_mask(CPU_LOG_INT, cs, 0);
  83         break;
  84     default:
  85         cpu_abort(env, "unhandled exception type=%d\n",
  86                   env->exception_index);
  87         break;
  88     }
  89 }
  90
  91 typedef struct {
  92     const char *name;
  93     uint32_t revision;
  94     uint8_t num_interrupts;
  95     uint8_t num_breakpoints;
  96     uint8_t num_watchpoints;
  97     uint32_t features;
  98 } LM32Def;
  99
 100 static const LM32Def lm32_defs[] = {
 101     {
 102         .name = "lm32-basic",
 103         .revision = 3,
 104         .num_interrupts = 32,
 105         .num_breakpoints = 4,
 106         .num_watchpoints = 4,
 107         .features = (LM32_FEATURE_SHIFT
 108                      | LM32_FEATURE_SIGN_EXTEND
 109                      | LM32_FEATURE_CYCLE_COUNT),
 110     },
 111     {
 112         .name = "lm32-standard",
 113         .revision = 3,
 114         .num_interrupts = 32,
 115         .num_breakpoints = 4,
 116         .num_watchpoints = 4,
 117         .features = (LM32_FEATURE_MULTIPLY
 118                      | LM32_FEATURE_DIVIDE
 119                      | LM32_FEATURE_SHIFT
 120                      | LM32_FEATURE_SIGN_EXTEND
 121                      | LM32_FEATURE_I_CACHE
 122                      | LM32_FEATURE_CYCLE_COUNT),
 123     },
 124     {
 125         .name = "lm32-full",
 126         .revision = 3,
 127         .num_interrupts = 32,
 128         .num_breakpoints = 4,
 129         .num_watchpoints = 4,
 130         .features = (LM32_FEATURE_MULTIPLY
 131                      | LM32_FEATURE_DIVIDE
 132                      | LM32_FEATURE_SHIFT
 133                      | LM32_FEATURE_SIGN_EXTEND
 134                      | LM32_FEATURE_I_CACHE
 135                      | LM32_FEATURE_D_CACHE
 136                      | LM32_FEATURE_CYCLE_COUNT),
 137     }
 138 };
 139
 140 void cpu_lm32_list(FILE *f, fprintf_function cpu_fprintf)
 141 {
 142     int i;
 143
 144     cpu_fprintf(f, "Available CPUs:\n");
 145     for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
 146         cpu_fprintf(f, "  %s\n", lm32_defs[i].name);
 147     }
 148 }
 149
 150 static const LM32Def *cpu_lm32_find_by_name(const char *name)
 151 {
 152     int i;
 153
 154     for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
 155         if (strcasecmp(name, lm32_defs[i].name) == 0) {
 156             return &lm32_defs[i];
 157         }
 158     }
 159
 160     return NULL;
 161 }
 162
 163 static uint32_t cfg_by_def(const LM32Def *def)
 164 {
 165     uint32_t cfg = 0;
 166
 167     if (def->features & LM32_FEATURE_MULTIPLY) {
 168         cfg |= CFG_M;
 169     }
 170
 171     if (def->features & LM32_FEATURE_DIVIDE) {
 172         cfg |= CFG_D;
 173     }
 174
 175     if (def->features & LM32_FEATURE_SHIFT) {
 176         cfg |= CFG_S;
 177     }
 178
 179     if (def->features & LM32_FEATURE_SIGN_EXTEND) {
 180         cfg |= CFG_X;
 181     }
 182
 183     if (def->features & LM32_FEATURE_I_CACHE) {
 184         cfg |= CFG_IC;
 185     }
 186
 187     if (def->features & LM32_FEATURE_D_CACHE) {
 188         cfg |= CFG_DC;
 189     }
 190
 191     if (def->features & LM32_FEATURE_CYCLE_COUNT) {
 192         cfg |= CFG_CC;
 193     }
 194
 195     cfg |= (def->num_interrupts << CFG_INT_SHIFT);
 196     cfg |= (def->num_breakpoints << CFG_BP_SHIFT);
 197     cfg |= (def->num_watchpoints << CFG_WP_SHIFT);
 198     cfg |= (def->revision << CFG_REV_SHIFT);
 199
 200     return cfg;
 201 }
 202
 203 LM32CPU *cpu_lm32_init(const char *cpu_model)
 204 {
 205     LM32CPU *cpu;
 206     CPULM32State *env;
 207     const LM32Def *def;
 208
 209     def = cpu_lm32_find_by_name(cpu_model);
 210     if (!def) {
 211         return NULL;
 212     }
 213
 214     cpu = LM32_CPU(object_new(TYPE_LM32_CPU));
 215     env = &cpu->env;
 216
 217     env->features = def->features;
 218     env->num_bps = def->num_breakpoints;
 219     env->num_wps = def->num_watchpoints;
 220     env->cfg = cfg_by_def(def);
 221
 222     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
 223
 224     return cpu;
 225 }
 226
 227 /* Some soc ignores the MSB on the address bus. Thus creating a shadow memory
 228  * area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
 229  * 0x80000000-0xffffffff is not cached and used to access IO devices. */
 230 void cpu_lm32_set_phys_msb_ignore(CPULM32State *env, int value)
 231 {
 232     if (value) {
 233         env->flags |= LM32_FLAG_IGNORE_MSB;
 234     } else {
 235         env->flags &= ~LM32_FLAG_IGNORE_MSB;
 236     }
 237 }