xref: /openbmc/qemu/hw/ppc/spapr_rtas.c (revision 878096ee)
1 /*
2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
3  *
4  * Hypercall based emulated RTAS
5  *
6  * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining a copy
9  * of this software and associated documentation files (the "Software"), to deal
10  * in the Software without restriction, including without limitation the rights
11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12  * copies of the Software, and to permit persons to whom the Software is
13  * furnished to do so, subject to the following conditions:
14  *
15  * The above copyright notice and this permission notice shall be included in
16  * all copies or substantial portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24  * THE SOFTWARE.
25  *
26  */
27 #include "cpu.h"
28 #include "sysemu/sysemu.h"
29 #include "sysemu/char.h"
30 #include "hw/qdev.h"
31 #include "sysemu/device_tree.h"
32 
33 #include "hw/ppc/spapr.h"
34 #include "hw/ppc/spapr_vio.h"
35 
36 #include <libfdt.h>
37 
38 #define TOKEN_BASE      0x2000
39 #define TOKEN_MAX       0x100
40 
41 static void rtas_display_character(sPAPREnvironment *spapr,
42                                    uint32_t token, uint32_t nargs,
43                                    target_ulong args,
44                                    uint32_t nret, target_ulong rets)
45 {
46     uint8_t c = rtas_ld(args, 0);
47     VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);
48 
49     if (!sdev) {
50         rtas_st(rets, 0, -1);
51     } else {
52         vty_putchars(sdev, &c, sizeof(c));
53         rtas_st(rets, 0, 0);
54     }
55 }
56 
57 static void rtas_get_time_of_day(sPAPREnvironment *spapr,
58                                  uint32_t token, uint32_t nargs,
59                                  target_ulong args,
60                                  uint32_t nret, target_ulong rets)
61 {
62     struct tm tm;
63 
64     if (nret != 8) {
65         rtas_st(rets, 0, -3);
66         return;
67     }
68 
69     qemu_get_timedate(&tm, spapr->rtc_offset);
70 
71     rtas_st(rets, 0, 0); /* Success */
72     rtas_st(rets, 1, tm.tm_year + 1900);
73     rtas_st(rets, 2, tm.tm_mon + 1);
74     rtas_st(rets, 3, tm.tm_mday);
75     rtas_st(rets, 4, tm.tm_hour);
76     rtas_st(rets, 5, tm.tm_min);
77     rtas_st(rets, 6, tm.tm_sec);
78     rtas_st(rets, 7, 0); /* we don't do nanoseconds */
79 }
80 
81 static void rtas_set_time_of_day(sPAPREnvironment *spapr,
82                                  uint32_t token, uint32_t nargs,
83                                  target_ulong args,
84                                  uint32_t nret, target_ulong rets)
85 {
86     struct tm tm;
87 
88     tm.tm_year = rtas_ld(args, 0) - 1900;
89     tm.tm_mon = rtas_ld(args, 1) - 1;
90     tm.tm_mday = rtas_ld(args, 2);
91     tm.tm_hour = rtas_ld(args, 3);
92     tm.tm_min = rtas_ld(args, 4);
93     tm.tm_sec = rtas_ld(args, 5);
94 
95     /* Just generate a monitor event for the change */
96     rtc_change_mon_event(&tm);
97     spapr->rtc_offset = qemu_timedate_diff(&tm);
98 
99     rtas_st(rets, 0, 0); /* Success */
100 }
101 
102 static void rtas_power_off(sPAPREnvironment *spapr,
103                            uint32_t token, uint32_t nargs, target_ulong args,
104                            uint32_t nret, target_ulong rets)
105 {
106     if (nargs != 2 || nret != 1) {
107         rtas_st(rets, 0, -3);
108         return;
109     }
110     qemu_system_shutdown_request();
111     rtas_st(rets, 0, 0);
112 }
113 
114 static void rtas_system_reboot(sPAPREnvironment *spapr,
115                                uint32_t token, uint32_t nargs,
116                                target_ulong args,
117                                uint32_t nret, target_ulong rets)
118 {
119     if (nargs != 0 || nret != 1) {
120         rtas_st(rets, 0, -3);
121         return;
122     }
123     qemu_system_reset_request();
124     rtas_st(rets, 0, 0);
125 }
126 
127 static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr,
128                                          uint32_t token, uint32_t nargs,
129                                          target_ulong args,
130                                          uint32_t nret, target_ulong rets)
131 {
132     target_ulong id;
133     CPUState *cpu;
134 
135     if (nargs != 1 || nret != 2) {
136         rtas_st(rets, 0, -3);
137         return;
138     }
139 
140     id = rtas_ld(args, 0);
141     cpu = qemu_get_cpu(id);
142     if (cpu != NULL) {
143         if (cpu->halted) {
144             rtas_st(rets, 1, 0);
145         } else {
146             rtas_st(rets, 1, 2);
147         }
148 
149         rtas_st(rets, 0, 0);
150         return;
151     }
152 
153     /* Didn't find a matching cpu */
154     rtas_st(rets, 0, -3);
155 }
156 
157 static void rtas_start_cpu(sPAPREnvironment *spapr,
158                            uint32_t token, uint32_t nargs,
159                            target_ulong args,
160                            uint32_t nret, target_ulong rets)
161 {
162     target_ulong id, start, r3;
163     CPUState *cs;
164 
165     if (nargs != 3 || nret != 1) {
166         rtas_st(rets, 0, -3);
167         return;
168     }
169 
170     id = rtas_ld(args, 0);
171     start = rtas_ld(args, 1);
172     r3 = rtas_ld(args, 2);
173 
174     cs = qemu_get_cpu(id);
175     if (cs != NULL) {
176         PowerPCCPU *cpu = POWERPC_CPU(cs);
177         CPUPPCState *env = &cpu->env;
178 
179         if (!cs->halted) {
180             rtas_st(rets, 0, -1);
181             return;
182         }
183 
184         /* This will make sure qemu state is up to date with kvm, and
185          * mark it dirty so our changes get flushed back before the
186          * new cpu enters */
187         kvm_cpu_synchronize_state(cs);
188 
189         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
190         env->nip = start;
191         env->gpr[3] = r3;
192         cs->halted = 0;
193 
194         qemu_cpu_kick(cs);
195 
196         rtas_st(rets, 0, 0);
197         return;
198     }
199 
200     /* Didn't find a matching cpu */
201     rtas_st(rets, 0, -3);
202 }
203 
204 static struct rtas_call {
205     const char *name;
206     spapr_rtas_fn fn;
207 } rtas_table[TOKEN_MAX];
208 
209 struct rtas_call *rtas_next = rtas_table;
210 
211 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
212                              uint32_t token, uint32_t nargs, target_ulong args,
213                              uint32_t nret, target_ulong rets)
214 {
215     if ((token >= TOKEN_BASE)
216         && ((token - TOKEN_BASE) < TOKEN_MAX)) {
217         struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
218 
219         if (call->fn) {
220             call->fn(spapr, token, nargs, args, nret, rets);
221             return H_SUCCESS;
222         }
223     }
224 
225     /* HACK: Some Linux early debug code uses RTAS display-character,
226      * but assumes the token value is 0xa (which it is on some real
227      * machines) without looking it up in the device tree.  This
228      * special case makes this work */
229     if (token == 0xa) {
230         rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
231         return H_SUCCESS;
232     }
233 
234     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
235     rtas_st(rets, 0, -3);
236     return H_PARAMETER;
237 }
238 
239 int spapr_rtas_register(const char *name, spapr_rtas_fn fn)
240 {
241     int i;
242 
243     for (i = 0; i < (rtas_next - rtas_table); i++) {
244         if (strcmp(name, rtas_table[i].name) == 0) {
245             fprintf(stderr, "RTAS call \"%s\" registered twice\n", name);
246             exit(1);
247         }
248     }
249 
250     assert(rtas_next < (rtas_table + TOKEN_MAX));
251 
252     rtas_next->name = name;
253     rtas_next->fn = fn;
254 
255     return (rtas_next++ - rtas_table) + TOKEN_BASE;
256 }
257 
258 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
259                                  hwaddr rtas_size)
260 {
261     int ret;
262     int i;
263 
264     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
265     if (ret < 0) {
266         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
267                 fdt_strerror(ret));
268         return ret;
269     }
270 
271     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
272                                     rtas_addr);
273     if (ret < 0) {
274         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
275                 fdt_strerror(ret));
276         return ret;
277     }
278 
279     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
280                                     rtas_addr);
281     if (ret < 0) {
282         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
283                 fdt_strerror(ret));
284         return ret;
285     }
286 
287     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
288                                     rtas_size);
289     if (ret < 0) {
290         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
291                 fdt_strerror(ret));
292         return ret;
293     }
294 
295     for (i = 0; i < TOKEN_MAX; i++) {
296         struct rtas_call *call = &rtas_table[i];
297 
298         if (!call->name) {
299             continue;
300         }
301 
302         ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
303                                         i + TOKEN_BASE);
304         if (ret < 0) {
305             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
306                     call->name, fdt_strerror(ret));
307             return ret;
308         }
309 
310     }
311     return 0;
312 }
313 
314 static void core_rtas_register_types(void)
315 {
316     spapr_rtas_register("display-character", rtas_display_character);
317     spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
318     spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
319     spapr_rtas_register("power-off", rtas_power_off);
320     spapr_rtas_register("system-reboot", rtas_system_reboot);
321     spapr_rtas_register("query-cpu-stopped-state",
322                         rtas_query_cpu_stopped_state);
323     spapr_rtas_register("start-cpu", rtas_start_cpu);
324 }
325 
326 type_init(core_rtas_register_types)
327