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 "exec/address-spaces.h"
  18 #include "exec/exec-all.h"
  19 #include "hw/watchdog/wdt_diag288.h"
  20 #include "sysemu/cpus.h"
  21 #include "hw/s390x/ipl.h"
  22
  23 static int modified_clear_reset(S390CPU *cpu)
  24 {
  25     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  26     CPUState *t;
  27
  28     pause_all_vcpus();
  29     cpu_synchronize_all_states();
  30     CPU_FOREACH(t) {
  31         run_on_cpu(t, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
  32     }
  33     s390_cmma_reset();
  34     subsystem_reset();
  35     s390_crypto_reset();
  36     scc->load_normal(CPU(cpu));
  37     cpu_synchronize_all_post_reset();
  38     resume_all_vcpus();
  39     return 0;
  40 }
  41
  42 static int load_normal_reset(S390CPU *cpu)
  43 {
  44     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  45     CPUState *t;
  46
  47     pause_all_vcpus();
  48     cpu_synchronize_all_states();
  49     CPU_FOREACH(t) {
  50         run_on_cpu(t, s390_do_cpu_reset, RUN_ON_CPU_NULL);
  51     }
  52     s390_cmma_reset();
  53     subsystem_reset();
  54     scc->initial_cpu_reset(CPU(cpu));
  55     scc->load_normal(CPU(cpu));
  56     cpu_synchronize_all_post_reset();
  57     resume_all_vcpus();
  58     return 0;
  59 }
  60
  61 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
  62 {
  63     uint64_t func = env->regs[r1];
  64     uint64_t timeout = env->regs[r1 + 1];
  65     uint64_t action = env->regs[r3];
  66     Object *obj;
  67     DIAG288State *diag288;
  68     DIAG288Class *diag288_class;
  69
  70     if (r1 % 2 || action != 0) {
  71         return -1;
  72     }
  73
  74     /* Timeout must be more than 15 seconds except for timer deletion */
  75     if (func != WDT_DIAG288_CANCEL && timeout < 15) {
  76         return -1;
  77     }
  78
  79     obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
  80     if (!obj) {
  81         return -1;
  82     }
  83
  84     diag288 = DIAG288(obj);
  85     diag288_class = DIAG288_GET_CLASS(diag288);
  86     return diag288_class->handle_timer(diag288, func, timeout);
  87 }
  88
  89 #define DIAG_308_RC_OK              0x0001
  90 #define DIAG_308_RC_NO_CONF         0x0102
  91 #define DIAG_308_RC_INVALID         0x0402
  92
  93 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3)
  94 {
  95     uint64_t addr =  env->regs[r1];
  96     uint64_t subcode = env->regs[r3];
  97     IplParameterBlock *iplb;
  98
  99     if (env->psw.mask & PSW_MASK_PSTATE) {
 100         program_interrupt(env, PGM_PRIVILEGED, ILEN_AUTO);
 101         return;
 102     }
 103
 104     if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
 105         program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 106         return;
 107     }
 108
 109     switch (subcode) {
 110     case 0:
 111         modified_clear_reset(s390_env_get_cpu(env));
 112         if (tcg_enabled()) {
 113             cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 114         }
 115         break;
 116     case 1:
 117         load_normal_reset(s390_env_get_cpu(env));
 118         if (tcg_enabled()) {
 119             cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 120         }
 121         break;
 122     case 3:
 123         s390_reipl_request();
 124         if (tcg_enabled()) {
 125             cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 126         }
 127         break;
 128     case 5:
 129         if ((r1 & 1) || (addr & 0x0fffULL)) {
 130             program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 131             return;
 132         }
 133         if (!address_space_access_valid(&address_space_memory, addr,
 134                                         sizeof(IplParameterBlock), false)) {
 135             program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO);
 136             return;
 137         }
 138         iplb = g_malloc0(sizeof(IplParameterBlock));
 139         cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
 140         if (!iplb_valid_len(iplb)) {
 141             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 142             goto out;
 143         }
 144
 145         cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 146
 147         if (!iplb_valid_ccw(iplb) && !iplb_valid_fcp(iplb)) {
 148             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 149             goto out;
 150         }
 151
 152         s390_ipl_update_diag308(iplb);
 153         env->regs[r1 + 1] = DIAG_308_RC_OK;
 154 out:
 155         g_free(iplb);
 156         return;
 157     case 6:
 158         if ((r1 & 1) || (addr & 0x0fffULL)) {
 159             program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 160             return;
 161         }
 162         if (!address_space_access_valid(&address_space_memory, addr,
 163                                         sizeof(IplParameterBlock), true)) {
 164             program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO);
 165             return;
 166         }
 167         iplb = s390_ipl_get_iplb();
 168         if (iplb) {
 169             cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
 170             env->regs[r1 + 1] = DIAG_308_RC_OK;
 171         } else {
 172             env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
 173         }
 174         return;
 175     default:
 176         hw_error("Unhandled diag308 subcode %" PRIx64, subcode);
 177         break;
 178     }
 179 }