target/s390x/diag.c

   1 /*
   2  * S390x DIAG instruction helper functions
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "qemu/osdep.h"
  16 #include "cpu.h"
  17 #include "internal.h"
  18 #include "exec/address-spaces.h"
  19 #include "exec/exec-all.h"
  20 #include "hw/watchdog/wdt_diag288.h"
  21 #include "sysemu/cpus.h"
  22 #include "hw/s390x/ipl.h"
  23
  24 static int modified_clear_reset(S390CPU *cpu)
  25 {
  26     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  27     CPUState *t;
  28
  29     pause_all_vcpus();
  30     cpu_synchronize_all_states();
  31     CPU_FOREACH(t) {
  32         run_on_cpu(t, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
  33     }
  34     s390_cmma_reset();
  35     subsystem_reset();
  36     s390_crypto_reset();
  37     scc->load_normal(CPU(cpu));
  38     cpu_synchronize_all_post_reset();
  39     resume_all_vcpus();
  40     return 0;
  41 }
  42
  43 static inline void s390_do_cpu_reset(CPUState *cs, run_on_cpu_data arg)
  44 {
  45     S390CPUClass *scc = S390_CPU_GET_CLASS(cs);
  46
  47     scc->cpu_reset(cs);
  48 }
  49
  50 static int load_normal_reset(S390CPU *cpu)
  51 {
  52     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  53     CPUState *t;
  54
  55     pause_all_vcpus();
  56     cpu_synchronize_all_states();
  57     CPU_FOREACH(t) {
  58         run_on_cpu(t, s390_do_cpu_reset, RUN_ON_CPU_NULL);
  59     }
  60     s390_cmma_reset();
  61     subsystem_reset();
  62     scc->initial_cpu_reset(CPU(cpu));
  63     scc->load_normal(CPU(cpu));
  64     cpu_synchronize_all_post_reset();
  65     resume_all_vcpus();
  66     return 0;
  67 }
  68
  69 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
  70 {
  71     uint64_t func = env->regs[r1];
  72     uint64_t timeout = env->regs[r1 + 1];
  73     uint64_t action = env->regs[r3];
  74     Object *obj;
  75     DIAG288State *diag288;
  76     DIAG288Class *diag288_class;
  77
  78     if (r1 % 2 || action != 0) {
  79         return -1;
  80     }
  81
  82     /* Timeout must be more than 15 seconds except for timer deletion */
  83     if (func != WDT_DIAG288_CANCEL && timeout < 15) {
  84         return -1;
  85     }
  86
  87     obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
  88     if (!obj) {
  89         return -1;
  90     }
  91
  92     diag288 = DIAG288(obj);
  93     diag288_class = DIAG288_GET_CLASS(diag288);
  94     return diag288_class->handle_timer(diag288, func, timeout);
  95 }
  96
  97 #define DIAG_308_RC_OK              0x0001
  98 #define DIAG_308_RC_NO_CONF         0x0102
  99 #define DIAG_308_RC_INVALID         0x0402
 100
 101 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3)
 102 {
 103     uint64_t addr =  env->regs[r1];
 104     uint64_t subcode = env->regs[r3];
 105     IplParameterBlock *iplb;
 106
 107     if (env->psw.mask & PSW_MASK_PSTATE) {
 108         program_interrupt(env, PGM_PRIVILEGED, ILEN_AUTO);
 109         return;
 110     }
 111
 112     if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
 113         program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 114         return;
 115     }
 116
 117     switch (subcode) {
 118     case 0:
 119         modified_clear_reset(s390_env_get_cpu(env));
 120         if (tcg_enabled()) {
 121             cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 122         }
 123         break;
 124     case 1:
 125         load_normal_reset(s390_env_get_cpu(env));
 126         if (tcg_enabled()) {
 127             cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 128         }
 129         break;
 130     case 3:
 131         s390_reipl_request();
 132         if (tcg_enabled()) {
 133             cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 134         }
 135         break;
 136     case 5:
 137         if ((r1 & 1) || (addr & 0x0fffULL)) {
 138             program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 139             return;
 140         }
 141         if (!address_space_access_valid(&address_space_memory, addr,
 142                                         sizeof(IplParameterBlock), false)) {
 143             program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO);
 144             return;
 145         }
 146         iplb = g_malloc0(sizeof(IplParameterBlock));
 147         cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
 148         if (!iplb_valid_len(iplb)) {
 149             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 150             goto out;
 151         }
 152
 153         cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 154
 155         if (!iplb_valid_ccw(iplb) && !iplb_valid_fcp(iplb)) {
 156             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 157             goto out;
 158         }
 159
 160         s390_ipl_update_diag308(iplb);
 161         env->regs[r1 + 1] = DIAG_308_RC_OK;
 162 out:
 163         g_free(iplb);
 164         return;
 165     case 6:
 166         if ((r1 & 1) || (addr & 0x0fffULL)) {
 167             program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 168             return;
 169         }
 170         if (!address_space_access_valid(&address_space_memory, addr,
 171                                         sizeof(IplParameterBlock), true)) {
 172             program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO);
 173             return;
 174         }
 175         iplb = s390_ipl_get_iplb();
 176         if (iplb) {
 177             cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
 178             env->regs[r1 + 1] = DIAG_308_RC_OK;
 179         } else {
 180             env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
 181         }
 182         return;
 183     default:
 184         hw_error("Unhandled diag308 subcode %" PRIx64, subcode);
 185         break;
 186     }
 187 }