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639e8102 DG |
1 | /* |
2 | * QEMU sPAPR NVRAM emulation | |
3 | * | |
4 | * Copyright (C) 2012 David Gibson, IBM Corporation. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
e2af7a4d | 24 | |
639e8102 DG |
25 | #include <libfdt.h> |
26 | ||
9c17d615 | 27 | #include "sysemu/device_tree.h" |
639e8102 DG |
28 | #include "hw/sysbus.h" |
29 | #include "hw/spapr.h" | |
30 | #include "hw/spapr_vio.h" | |
31 | ||
32 | typedef struct sPAPRNVRAM { | |
33 | VIOsPAPRDevice sdev; | |
34 | uint32_t size; | |
35 | uint8_t *buf; | |
36 | BlockDriverState *drive; | |
37 | } sPAPRNVRAM; | |
38 | ||
39 | #define MIN_NVRAM_SIZE 8192 | |
a64ae610 | 40 | #define DEFAULT_NVRAM_SIZE 65536 |
639e8102 DG |
41 | #define MAX_NVRAM_SIZE (UINT16_MAX * 16) |
42 | ||
43 | static void rtas_nvram_fetch(sPAPREnvironment *spapr, | |
44 | uint32_t token, uint32_t nargs, | |
45 | target_ulong args, | |
46 | uint32_t nret, target_ulong rets) | |
47 | { | |
48 | sPAPRNVRAM *nvram = spapr->nvram; | |
49 | hwaddr offset, buffer, len; | |
50 | int alen; | |
51 | void *membuf; | |
52 | ||
53 | if ((nargs != 3) || (nret != 2)) { | |
54 | rtas_st(rets, 0, -3); | |
55 | return; | |
56 | } | |
57 | ||
58 | if (!nvram) { | |
59 | rtas_st(rets, 0, -1); | |
60 | rtas_st(rets, 1, 0); | |
61 | return; | |
62 | } | |
63 | ||
64 | offset = rtas_ld(args, 0); | |
65 | buffer = rtas_ld(args, 1); | |
66 | len = rtas_ld(args, 2); | |
67 | ||
68 | if (((offset + len) < offset) | |
69 | || ((offset + len) > nvram->size)) { | |
70 | rtas_st(rets, 0, -3); | |
71 | rtas_st(rets, 1, 0); | |
72 | return; | |
73 | } | |
74 | ||
75 | membuf = cpu_physical_memory_map(buffer, &len, 1); | |
76 | if (nvram->drive) { | |
77 | alen = bdrv_pread(nvram->drive, offset, membuf, len); | |
78 | } else { | |
79 | assert(nvram->buf); | |
80 | ||
81 | memcpy(membuf, nvram->buf + offset, len); | |
82 | alen = len; | |
83 | } | |
84 | cpu_physical_memory_unmap(membuf, len, 1, len); | |
85 | ||
86 | rtas_st(rets, 0, (alen < len) ? -1 : 0); | |
87 | rtas_st(rets, 1, (alen < 0) ? 0 : alen); | |
88 | } | |
89 | ||
90 | static void rtas_nvram_store(sPAPREnvironment *spapr, | |
91 | uint32_t token, uint32_t nargs, | |
92 | target_ulong args, | |
93 | uint32_t nret, target_ulong rets) | |
94 | { | |
95 | sPAPRNVRAM *nvram = spapr->nvram; | |
96 | hwaddr offset, buffer, len; | |
97 | int alen; | |
98 | void *membuf; | |
99 | ||
100 | if ((nargs != 3) || (nret != 2)) { | |
101 | rtas_st(rets, 0, -3); | |
102 | return; | |
103 | } | |
104 | ||
105 | if (!nvram) { | |
106 | rtas_st(rets, 0, -1); | |
107 | return; | |
108 | } | |
109 | ||
110 | offset = rtas_ld(args, 0); | |
111 | buffer = rtas_ld(args, 1); | |
112 | len = rtas_ld(args, 2); | |
113 | ||
114 | if (((offset + len) < offset) | |
115 | || ((offset + len) > nvram->size)) { | |
116 | rtas_st(rets, 0, -3); | |
117 | return; | |
118 | } | |
119 | ||
120 | membuf = cpu_physical_memory_map(buffer, &len, 0); | |
121 | if (nvram->drive) { | |
122 | alen = bdrv_pwrite(nvram->drive, offset, membuf, len); | |
123 | } else { | |
124 | assert(nvram->buf); | |
125 | ||
126 | memcpy(nvram->buf + offset, membuf, len); | |
127 | alen = len; | |
128 | } | |
129 | cpu_physical_memory_unmap(membuf, len, 0, len); | |
130 | ||
131 | rtas_st(rets, 0, (alen < len) ? -1 : 0); | |
132 | rtas_st(rets, 1, (alen < 0) ? 0 : alen); | |
133 | } | |
134 | ||
135 | static int spapr_nvram_init(VIOsPAPRDevice *dev) | |
136 | { | |
137 | sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; | |
138 | ||
139 | if (nvram->drive) { | |
140 | nvram->size = bdrv_getlength(nvram->drive); | |
141 | } else { | |
142 | nvram->size = DEFAULT_NVRAM_SIZE; | |
143 | nvram->buf = g_malloc0(nvram->size); | |
144 | } | |
145 | ||
146 | if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) { | |
147 | fprintf(stderr, "spapr-nvram must be between %d and %d bytes in size\n", | |
148 | MIN_NVRAM_SIZE, MAX_NVRAM_SIZE); | |
149 | return -1; | |
150 | } | |
151 | ||
152 | spapr_rtas_register("nvram-fetch", rtas_nvram_fetch); | |
153 | spapr_rtas_register("nvram-store", rtas_nvram_store); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static int spapr_nvram_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off) | |
159 | { | |
160 | sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; | |
161 | ||
162 | return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size); | |
163 | } | |
164 | ||
165 | static Property spapr_nvram_properties[] = { | |
166 | DEFINE_SPAPR_PROPERTIES(sPAPRNVRAM, sdev), | |
167 | DEFINE_PROP_DRIVE("drive", sPAPRNVRAM, drive), | |
168 | DEFINE_PROP_END_OF_LIST(), | |
169 | }; | |
170 | ||
171 | static void spapr_nvram_class_init(ObjectClass *klass, void *data) | |
172 | { | |
173 | DeviceClass *dc = DEVICE_CLASS(klass); | |
174 | VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); | |
175 | ||
176 | k->init = spapr_nvram_init; | |
177 | k->devnode = spapr_nvram_devnode; | |
178 | k->dt_name = "nvram"; | |
179 | k->dt_type = "nvram"; | |
180 | k->dt_compatible = "qemu,spapr-nvram"; | |
181 | dc->props = spapr_nvram_properties; | |
182 | } | |
183 | ||
184 | static const TypeInfo spapr_nvram_type_info = { | |
185 | .name = "spapr-nvram", | |
186 | .parent = TYPE_VIO_SPAPR_DEVICE, | |
187 | .instance_size = sizeof(sPAPRNVRAM), | |
188 | .class_init = spapr_nvram_class_init, | |
189 | }; | |
190 | ||
191 | static void spapr_nvram_register_types(void) | |
192 | { | |
193 | type_register_static(&spapr_nvram_type_info); | |
194 | } | |
195 | ||
196 | type_init(spapr_nvram_register_types) |