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