target-arm/machine.c

   1 #include "hw/hw.h"
   2 #include "hw/boards.h"
   3 #include "sysemu/kvm.h"
   4 #include "kvm_arm.h"
   5
   6 static bool vfp_needed(void *opaque)
   7 {
   8     ARMCPU *cpu = opaque;
   9     CPUARMState *env = &cpu->env;
  10
  11     return arm_feature(env, ARM_FEATURE_VFP);
  12 }
  13
  14 static int get_fpscr(QEMUFile *f, void *opaque, size_t size)
  15 {
  16     ARMCPU *cpu = opaque;
  17     CPUARMState *env = &cpu->env;
  18     uint32_t val = qemu_get_be32(f);
  19
  20     vfp_set_fpscr(env, val);
  21     return 0;
  22 }
  23
  24 static void put_fpscr(QEMUFile *f, void *opaque, size_t size)
  25 {
  26     ARMCPU *cpu = opaque;
  27     CPUARMState *env = &cpu->env;
  28
  29     qemu_put_be32(f, vfp_get_fpscr(env));
  30 }
  31
  32 static const VMStateInfo vmstate_fpscr = {
  33     .name = "fpscr",
  34     .get = get_fpscr,
  35     .put = put_fpscr,
  36 };
  37
  38 static const VMStateDescription vmstate_vfp = {
  39     .name = "cpu/vfp",
  40     .version_id = 3,
  41     .minimum_version_id = 3,
  42     .minimum_version_id_old = 3,
  43     .fields = (VMStateField[]) {
  44         VMSTATE_FLOAT64_ARRAY(env.vfp.regs, ARMCPU, 64),
  45         /* The xregs array is a little awkward because element 1 (FPSCR)
  46          * requires a specific accessor, so we have to split it up in
  47          * the vmstate:
  48          */
  49         VMSTATE_UINT32(env.vfp.xregs[0], ARMCPU),
  50         VMSTATE_UINT32_SUB_ARRAY(env.vfp.xregs, ARMCPU, 2, 14),
  51         {
  52             .name = "fpscr",
  53             .version_id = 0,
  54             .size = sizeof(uint32_t),
  55             .info = &vmstate_fpscr,
  56             .flags = VMS_SINGLE,
  57             .offset = 0,
  58         },
  59         VMSTATE_END_OF_LIST()
  60     }
  61 };
  62
  63 static bool iwmmxt_needed(void *opaque)
  64 {
  65     ARMCPU *cpu = opaque;
  66     CPUARMState *env = &cpu->env;
  67
  68     return arm_feature(env, ARM_FEATURE_IWMMXT);
  69 }
  70
  71 static const VMStateDescription vmstate_iwmmxt = {
  72     .name = "cpu/iwmmxt",
  73     .version_id = 1,
  74     .minimum_version_id = 1,
  75     .minimum_version_id_old = 1,
  76     .fields = (VMStateField[]) {
  77         VMSTATE_UINT64_ARRAY(env.iwmmxt.regs, ARMCPU, 16),
  78         VMSTATE_UINT32_ARRAY(env.iwmmxt.cregs, ARMCPU, 16),
  79         VMSTATE_END_OF_LIST()
  80     }
  81 };
  82
  83 static bool m_needed(void *opaque)
  84 {
  85     ARMCPU *cpu = opaque;
  86     CPUARMState *env = &cpu->env;
  87
  88     return arm_feature(env, ARM_FEATURE_M);
  89 }
  90
  91 const VMStateDescription vmstate_m = {
  92     .name = "cpu/m",
  93     .version_id = 1,
  94     .minimum_version_id = 1,
  95     .minimum_version_id_old = 1,
  96     .fields = (VMStateField[]) {
  97         VMSTATE_UINT32(env.v7m.other_sp, ARMCPU),
  98         VMSTATE_UINT32(env.v7m.vecbase, ARMCPU),
  99         VMSTATE_UINT32(env.v7m.basepri, ARMCPU),
 100         VMSTATE_UINT32(env.v7m.control, ARMCPU),
 101         VMSTATE_INT32(env.v7m.current_sp, ARMCPU),
 102         VMSTATE_INT32(env.v7m.exception, ARMCPU),
 103         VMSTATE_END_OF_LIST()
 104     }
 105 };
 106
 107 static bool thumb2ee_needed(void *opaque)
 108 {
 109     ARMCPU *cpu = opaque;
 110     CPUARMState *env = &cpu->env;
 111
 112     return arm_feature(env, ARM_FEATURE_THUMB2EE);
 113 }
 114
 115 static const VMStateDescription vmstate_thumb2ee = {
 116     .name = "cpu/thumb2ee",
 117     .version_id = 1,
 118     .minimum_version_id = 1,
 119     .minimum_version_id_old = 1,
 120     .fields = (VMStateField[]) {
 121         VMSTATE_UINT32(env.teecr, ARMCPU),
 122         VMSTATE_UINT32(env.teehbr, ARMCPU),
 123         VMSTATE_END_OF_LIST()
 124     }
 125 };
 126
 127 static int get_cpsr(QEMUFile *f, void *opaque, size_t size)
 128 {
 129     ARMCPU *cpu = opaque;
 130     CPUARMState *env = &cpu->env;
 131     uint32_t val = qemu_get_be32(f);
 132
 133     /* Avoid mode switch when restoring CPSR */
 134     env->uncached_cpsr = val & CPSR_M;
 135     cpsr_write(env, val, 0xffffffff);
 136     return 0;
 137 }
 138
 139 static void put_cpsr(QEMUFile *f, void *opaque, size_t size)
 140 {
 141     ARMCPU *cpu = opaque;
 142     CPUARMState *env = &cpu->env;
 143
 144     qemu_put_be32(f, cpsr_read(env));
 145 }
 146
 147 static const VMStateInfo vmstate_cpsr = {
 148     .name = "cpsr",
 149     .get = get_cpsr,
 150     .put = put_cpsr,
 151 };
 152
 153 static void cpu_pre_save(void *opaque)
 154 {
 155     ARMCPU *cpu = opaque;
 156
 157     if (kvm_enabled()) {
 158         if (!write_kvmstate_to_list(cpu)) {
 159             /* This should never fail */
 160             abort();
 161         }
 162     } else {
 163         if (!write_cpustate_to_list(cpu)) {
 164             /* This should never fail. */
 165             abort();
 166         }
 167     }
 168
 169     cpu->cpreg_vmstate_array_len = cpu->cpreg_array_len;
 170     memcpy(cpu->cpreg_vmstate_indexes, cpu->cpreg_indexes,
 171            cpu->cpreg_array_len * sizeof(uint64_t));
 172     memcpy(cpu->cpreg_vmstate_values, cpu->cpreg_values,
 173            cpu->cpreg_array_len * sizeof(uint64_t));
 174 }
 175
 176 static int cpu_post_load(void *opaque, int version_id)
 177 {
 178     ARMCPU *cpu = opaque;
 179     int i, v;
 180
 181     /* Update the values list from the incoming migration data.
 182      * Anything in the incoming data which we don't know about is
 183      * a migration failure; anything we know about but the incoming
 184      * data doesn't specify retains its current (reset) value.
 185      * The indexes list remains untouched -- we only inspect the
 186      * incoming migration index list so we can match the values array
 187      * entries with the right slots in our own values array.
 188      */
 189
 190     for (i = 0, v = 0; i < cpu->cpreg_array_len
 191              && v < cpu->cpreg_vmstate_array_len; i++) {
 192         if (cpu->cpreg_vmstate_indexes[v] > cpu->cpreg_indexes[i]) {
 193             /* register in our list but not incoming : skip it */
 194             continue;
 195         }
 196         if (cpu->cpreg_vmstate_indexes[v] < cpu->cpreg_indexes[i]) {
 197             /* register in their list but not ours: fail migration */
 198             return -1;
 199         }
 200         /* matching register, copy the value over */
 201         cpu->cpreg_values[i] = cpu->cpreg_vmstate_values[v];
 202         v++;
 203     }
 204
 205     if (kvm_enabled()) {
 206         if (!write_list_to_kvmstate(cpu)) {
 207             return -1;
 208         }
 209         /* Note that it's OK for the TCG side not to know about
 210          * every register in the list; KVM is authoritative if
 211          * we're using it.
 212          */
 213         write_list_to_cpustate(cpu);
 214     } else {
 215         if (!write_list_to_cpustate(cpu)) {
 216             return -1;
 217         }
 218     }
 219
 220     return 0;
 221 }
 222
 223 const VMStateDescription vmstate_arm_cpu = {
 224     .name = "cpu",
 225     .version_id = 14,
 226     .minimum_version_id = 14,
 227     .minimum_version_id_old = 14,
 228     .pre_save = cpu_pre_save,
 229     .post_load = cpu_post_load,
 230     .fields = (VMStateField[]) {
 231         VMSTATE_UINT32_ARRAY(env.regs, ARMCPU, 16),
 232         {
 233             .name = "cpsr",
 234             .version_id = 0,
 235             .size = sizeof(uint32_t),
 236             .info = &vmstate_cpsr,
 237             .flags = VMS_SINGLE,
 238             .offset = 0,
 239         },
 240         VMSTATE_UINT32(env.spsr, ARMCPU),
 241         VMSTATE_UINT32_ARRAY(env.banked_spsr, ARMCPU, 6),
 242         VMSTATE_UINT32_ARRAY(env.banked_r13, ARMCPU, 6),
 243         VMSTATE_UINT32_ARRAY(env.banked_r14, ARMCPU, 6),
 244         VMSTATE_UINT32_ARRAY(env.usr_regs, ARMCPU, 5),
 245         VMSTATE_UINT32_ARRAY(env.fiq_regs, ARMCPU, 5),
 246         /* The length-check must come before the arrays to avoid
 247          * incoming data possibly overflowing the array.
 248          */
 249         VMSTATE_INT32_LE(cpreg_vmstate_array_len, ARMCPU),
 250         VMSTATE_VARRAY_INT32(cpreg_vmstate_indexes, ARMCPU,
 251                              cpreg_vmstate_array_len,
 252                              0, vmstate_info_uint64, uint64_t),
 253         VMSTATE_VARRAY_INT32(cpreg_vmstate_values, ARMCPU,
 254                              cpreg_vmstate_array_len,
 255                              0, vmstate_info_uint64, uint64_t),
 256         VMSTATE_UINT64(env.exclusive_addr, ARMCPU),
 257         VMSTATE_UINT64(env.exclusive_val, ARMCPU),
 258         VMSTATE_UINT64(env.exclusive_high, ARMCPU),
 259         VMSTATE_UINT64(env.features, ARMCPU),
 260         VMSTATE_TIMER(gt_timer[GTIMER_PHYS], ARMCPU),
 261         VMSTATE_TIMER(gt_timer[GTIMER_VIRT], ARMCPU),
 262         VMSTATE_END_OF_LIST()
 263     },
 264     .subsections = (VMStateSubsection[]) {
 265         {
 266             .vmsd = &vmstate_vfp,
 267             .needed = vfp_needed,
 268         } , {
 269             .vmsd = &vmstate_iwmmxt,
 270             .needed = iwmmxt_needed,
 271         } , {
 272             .vmsd = &vmstate_m,
 273             .needed = m_needed,
 274         } , {
 275             .vmsd = &vmstate_thumb2ee,
 276             .needed = thumb2ee_needed,
 277         } , {
 278             /* empty */
 279         }
 280     }
 281 };