s390x: refactor reset/reipl handling
[qemu.git] / 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 #include "hw/s390x/s390-virtio-ccw.h"
24
25 int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
26 {
27 uint64_t func = env->regs[r1];
28 uint64_t timeout = env->regs[r1 + 1];
29 uint64_t action = env->regs[r3];
30 Object *obj;
31 DIAG288State *diag288;
32 DIAG288Class *diag288_class;
33
34 if (r1 % 2 || action != 0) {
35 return -1;
36 }
37
38 /* Timeout must be more than 15 seconds except for timer deletion */
39 if (func != WDT_DIAG288_CANCEL && timeout < 15) {
40 return -1;
41 }
42
43 obj = object_resolve_path_type("", TYPE_WDT_DIAG288, NULL);
44 if (!obj) {
45 return -1;
46 }
47
48 diag288 = DIAG288(obj);
49 diag288_class = DIAG288_GET_CLASS(diag288);
50 return diag288_class->handle_timer(diag288, func, timeout);
51 }
52
53 #define DIAG_308_RC_OK 0x0001
54 #define DIAG_308_RC_NO_CONF 0x0102
55 #define DIAG_308_RC_INVALID 0x0402
56
57 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
58 {
59 CPUState *cs = CPU(s390_env_get_cpu(env));
60 uint64_t addr = env->regs[r1];
61 uint64_t subcode = env->regs[r3];
62 IplParameterBlock *iplb;
63
64 if (env->psw.mask & PSW_MASK_PSTATE) {
65 s390_program_interrupt(env, PGM_PRIVILEGED, ILEN_AUTO, ra);
66 return;
67 }
68
69 if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
70 s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
71 return;
72 }
73
74 switch (subcode) {
75 case 0:
76 s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
77 break;
78 case 1:
79 s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
80 break;
81 case 3:
82 s390_ipl_reset_request(cs, S390_RESET_REIPL);
83 break;
84 case 5:
85 if ((r1 & 1) || (addr & 0x0fffULL)) {
86 s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
87 return;
88 }
89 if (!address_space_access_valid(&address_space_memory, addr,
90 sizeof(IplParameterBlock), false)) {
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 s390_program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO, ra);
121 return;
122 }
123 iplb = s390_ipl_get_iplb();
124 if (iplb) {
125 cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
126 env->regs[r1 + 1] = DIAG_308_RC_OK;
127 } else {
128 env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
129 }
130 return;
131 default:
132 hw_error("Unhandled diag308 subcode %" PRIx64, subcode);
133 break;
134 }
135 }