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 #define DIAG308_RESET_MOD_CLR       0
  57 #define DIAG308_RESET_LOAD_NORM     1
  58 #define DIAG308_LOAD_CLEAR          3
  59 #define DIAG308_LOAD_NORMAL_DUMP    4
  60 #define DIAG308_SET                 5
  61 #define DIAG308_STORE               6
  62
  63 static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
  64                               uintptr_t ra, bool write)
  65 {
  66     if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) {
  67         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  68         return -1;
  69     }
  70     if (!address_space_access_valid(&address_space_memory, addr,
  71                                     sizeof(IplParameterBlock), write,
  72                                     MEMTXATTRS_UNSPECIFIED)) {
  73         s390_program_interrupt(env, PGM_ADDRESSING, ra);
  74         return -1;
  75     }
  76     return 0;
  77 }
  78
  79 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
  80 {
  81     CPUState *cs = env_cpu(env);
  82     uint64_t addr =  env->regs[r1];
  83     uint64_t subcode = env->regs[r3];
  84     IplParameterBlock *iplb;
  85
  86     if (env->psw.mask & PSW_MASK_PSTATE) {
  87         s390_program_interrupt(env, PGM_PRIVILEGED, ra);
  88         return;
  89     }
  90
  91     if (subcode & ~0x0ffffULL) {
  92         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
  93         return;
  94     }
  95
  96     switch (subcode) {
  97     case DIAG308_RESET_MOD_CLR:
  98         s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
  99         break;
 100     case DIAG308_RESET_LOAD_NORM:
 101         s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
 102         break;
 103     case DIAG308_LOAD_CLEAR:
 104         /* Well we still lack the clearing bit... */
 105         s390_ipl_reset_request(cs, S390_RESET_REIPL);
 106         break;
 107     case DIAG308_SET:
 108         if (diag308_parm_check(env, r1, addr, ra, false)) {
 109             return;
 110         }
 111         iplb = g_new0(IplParameterBlock, 1);
 112         cpu_physical_memory_read(addr, iplb, sizeof(iplb->len));
 113         if (!iplb_valid_len(iplb)) {
 114             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 115             goto out;
 116         }
 117
 118         cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 119
 120         if (!iplb_valid_ccw(iplb) && !iplb_valid_fcp(iplb)) {
 121             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
 122             goto out;
 123         }
 124
 125         s390_ipl_update_diag308(iplb);
 126         env->regs[r1 + 1] = DIAG_308_RC_OK;
 127 out:
 128         g_free(iplb);
 129         return;
 130     case DIAG308_STORE:
 131         if (diag308_parm_check(env, r1, addr, ra, true)) {
 132             return;
 133         }
 134         iplb = s390_ipl_get_iplb();
 135         if (iplb) {
 136             cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
 137             env->regs[r1 + 1] = DIAG_308_RC_OK;
 138         } else {
 139             env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
 140         }
 141         return;
 142     default:
 143         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
 144         break;
 145     }
 146 }