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(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 } 147