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 "hw/watchdog/wdt_diag288.h"
  20 #include "sysemu/cpus.h"
  21 #include "hw/s390x/ipl.h"
  22 #include "hw/s390x/s390-virtio-ccw.h"
  23
  24 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
  25 {
  26     uint64_t func = env->regs[r1];
  27     uint64_t timeout = env->regs[r1 + 1];
  28     uint64_t action = env->regs[r3];
  29     Object *obj;
  30     DIAG288State *diag288;
  31     DIAG288Class *diag288_class;
  32
  33     if (r1 % 2 || action != 0) {
  34         return -1;
  35     }
  36
  37     /* Timeout must be more than 15 seconds except for timer deletion */
  38     if (func != WDT_DIAG288_CANCEL && timeout < 15) {
  39         return -1;
  40     }
  41
  42     obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
  43     if (!obj) {
  44         return -1;
  45     }
  46
  47     diag288 = DIAG288(obj);
  48     diag288_class = DIAG288_GET_CLASS(diag288);
  49     return diag288_class->handle_timer(diag288, func, timeout);
  50 }
  51
  52 #define DIAG_308_RC_OK              0x0001
  53 #define DIAG_308_RC_NO_CONF         0x0102
  54 #define DIAG_308_RC_INVALID         0x0402
  55
  56 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
  57 {
  58     CPUState *cs = CPU(s390_env_get_cpu(env));
  59     uint64_t addr =  env->regs[r1];
  60     uint64_t subcode = env->regs[r3];
  61     IplParameterBlock *iplb;
  62
  63     if (env->psw.mask & PSW_MASK_PSTATE) {
  64         s390_program_interrupt(env, PGM_PRIVILEGED, ILEN_AUTO, ra);
  65         return;
  66     }
  67
  68     if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
  69         s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
  70         return;
  71     }
  72
  73     switch (subcode) {
  74     case 0:
  75         s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
  76         break;
  77     case 1:
  78         s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
  79         break;
  80     case 3:
  81         s390_ipl_reset_request(cs, S390_RESET_REIPL);
  82         break;
  83     case 5:
  84         if ((r1 & 1) || (addr & 0x0fffULL)) {
  85             s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
  86             return;
  87         }
  88         if (!address_space_access_valid(&address_space_memory, addr,
  89                                         sizeof(IplParameterBlock), false,
  90                                         MEMTXATTRS_UNSPECIFIED)) {
  91             s390_program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO, ra);
  92             return;
  93         }
  94         iplb = g_new0(IplParameterBlock, 1);
  95         cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
  96         if (!iplb_valid_len(iplb)) {
  97             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
  98             goto out;
  99         }
 100
 101         cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 102
 103         if (!iplb_valid_ccw(iplb) && !iplb_valid_fcp(iplb)) {
 104             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 105             goto out;
 106         }
 107
 108         s390_ipl_update_diag308(iplb);
 109         env->regs[r1 + 1] = DIAG_308_RC_OK;
 110 out:
 111         g_free(iplb);
 112         return;
 113     case 6:
 114         if ((r1 & 1) || (addr & 0x0fffULL)) {
 115             s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
 116             return;
 117         }
 118         if (!address_space_access_valid(&address_space_memory, addr,
 119                                         sizeof(IplParameterBlock), true,
 120                                         MEMTXATTRS_UNSPECIFIED)) {
 121             s390_program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO, ra);
 122             return;
 123         }
 124         iplb = s390_ipl_get_iplb();
 125         if (iplb) {
 126             cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
 127             env->regs[r1 + 1] = DIAG_308_RC_OK;
 128         } else {
 129             env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
 130         }
 131         return;
 132     default:
 133         s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
 134         break;
 135     }
 136 }