1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21#include <linux/bug.h>
22#include <linux/efi.h>
23#include <linux/init.h>
24#include <linux/string.h>
25
26#include <xen/interface/xen.h>
27#include <xen/interface/platform.h>
28#include <xen/xen.h>
29
30#include <asm/page.h>
31
32#include <asm/xen/hypercall.h>
33
34#define INIT_EFI_OP(name) \
35 {.cmd = XENPF_efi_runtime_call, \
36 .u.efi_runtime_call.function = XEN_EFI_##name, \
37 .u.efi_runtime_call.misc = 0}
38
39#define efi_data(op) (op.u.efi_runtime_call)
40
41static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
42{
43 struct xen_platform_op op = INIT_EFI_OP(get_time);
44
45 if (HYPERVISOR_dom0_op(&op) < 0)
46 return EFI_UNSUPPORTED;
47
48 if (tm) {
49 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
50 memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
51 }
52
53 if (tc) {
54 tc->resolution = efi_data(op).u.get_time.resolution;
55 tc->accuracy = efi_data(op).u.get_time.accuracy;
56 tc->sets_to_zero = !!(efi_data(op).misc &
57 XEN_EFI_GET_TIME_SET_CLEARS_NS);
58 }
59
60 return efi_data(op).status;
61}
62
63static efi_status_t xen_efi_set_time(efi_time_t *tm)
64{
65 struct xen_platform_op op = INIT_EFI_OP(set_time);
66
67 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
68 memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
69
70 if (HYPERVISOR_dom0_op(&op) < 0)
71 return EFI_UNSUPPORTED;
72
73 return efi_data(op).status;
74}
75
76static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
77 efi_bool_t *pending,
78 efi_time_t *tm)
79{
80 struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
81
82 if (HYPERVISOR_dom0_op(&op) < 0)
83 return EFI_UNSUPPORTED;
84
85 if (tm) {
86 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
87 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
88 }
89
90 if (enabled)
91 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
92
93 if (pending)
94 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
95
96 return efi_data(op).status;
97}
98
99static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
100{
101 struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
102
103 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
104 if (enabled)
105 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
106 if (tm)
107 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
108 else
109 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
110
111 if (HYPERVISOR_dom0_op(&op) < 0)
112 return EFI_UNSUPPORTED;
113
114 return efi_data(op).status;
115}
116
117static efi_status_t xen_efi_get_variable(efi_char16_t *name,
118 efi_guid_t *vendor,
119 u32 *attr,
120 unsigned long *data_size,
121 void *data)
122{
123 struct xen_platform_op op = INIT_EFI_OP(get_variable);
124
125 set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
126 BUILD_BUG_ON(sizeof(*vendor) !=
127 sizeof(efi_data(op).u.get_variable.vendor_guid));
128 memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
129 efi_data(op).u.get_variable.size = *data_size;
130 set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
131
132 if (HYPERVISOR_dom0_op(&op) < 0)
133 return EFI_UNSUPPORTED;
134
135 *data_size = efi_data(op).u.get_variable.size;
136 if (attr)
137 *attr = efi_data(op).misc;
138
139 return efi_data(op).status;
140}
141
142static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
143 efi_char16_t *name,
144 efi_guid_t *vendor)
145{
146 struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
147
148 efi_data(op).u.get_next_variable_name.size = *name_size;
149 set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
150 BUILD_BUG_ON(sizeof(*vendor) !=
151 sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
152 memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
153 sizeof(*vendor));
154
155 if (HYPERVISOR_dom0_op(&op) < 0)
156 return EFI_UNSUPPORTED;
157
158 *name_size = efi_data(op).u.get_next_variable_name.size;
159 memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
160 sizeof(*vendor));
161
162 return efi_data(op).status;
163}
164
165static efi_status_t xen_efi_set_variable(efi_char16_t *name,
166 efi_guid_t *vendor,
167 u32 attr,
168 unsigned long data_size,
169 void *data)
170{
171 struct xen_platform_op op = INIT_EFI_OP(set_variable);
172
173 set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
174 efi_data(op).misc = attr;
175 BUILD_BUG_ON(sizeof(*vendor) !=
176 sizeof(efi_data(op).u.set_variable.vendor_guid));
177 memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
178 efi_data(op).u.set_variable.size = data_size;
179 set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
180
181 if (HYPERVISOR_dom0_op(&op) < 0)
182 return EFI_UNSUPPORTED;
183
184 return efi_data(op).status;
185}
186
187static efi_status_t xen_efi_query_variable_info(u32 attr,
188 u64 *storage_space,
189 u64 *remaining_space,
190 u64 *max_variable_size)
191{
192 struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
193
194 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
195 return EFI_UNSUPPORTED;
196
197 efi_data(op).u.query_variable_info.attr = attr;
198
199 if (HYPERVISOR_dom0_op(&op) < 0)
200 return EFI_UNSUPPORTED;
201
202 *storage_space = efi_data(op).u.query_variable_info.max_store_size;
203 *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
204 *max_variable_size = efi_data(op).u.query_variable_info.max_size;
205
206 return efi_data(op).status;
207}
208
209static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
210{
211 struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
212
213 if (HYPERVISOR_dom0_op(&op) < 0)
214 return EFI_UNSUPPORTED;
215
216 *count = efi_data(op).misc;
217
218 return efi_data(op).status;
219}
220
221static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
222 unsigned long count,
223 unsigned long sg_list)
224{
225 struct xen_platform_op op = INIT_EFI_OP(update_capsule);
226
227 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
228 return EFI_UNSUPPORTED;
229
230 set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
231 capsules);
232 efi_data(op).u.update_capsule.capsule_count = count;
233 efi_data(op).u.update_capsule.sg_list = sg_list;
234
235 if (HYPERVISOR_dom0_op(&op) < 0)
236 return EFI_UNSUPPORTED;
237
238 return efi_data(op).status;
239}
240
241static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
242 unsigned long count,
243 u64 *max_size,
244 int *reset_type)
245{
246 struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
247
248 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
249 return EFI_UNSUPPORTED;
250
251 set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
252 capsules);
253 efi_data(op).u.query_capsule_capabilities.capsule_count = count;
254
255 if (HYPERVISOR_dom0_op(&op) < 0)
256 return EFI_UNSUPPORTED;
257
258 *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
259 *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
260
261 return efi_data(op).status;
262}
263
264static efi_char16_t vendor[100] __initdata;
265
266static efi_system_table_t efi_systab_xen __initdata = {
267 .hdr = {
268 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
269 .revision = 0,
270 .headersize = 0,
271 .crc32 = 0,
272 .reserved = 0
273 },
274 .fw_vendor = EFI_INVALID_TABLE_ADDR,
275 .fw_revision = 0,
276 .con_in_handle = EFI_INVALID_TABLE_ADDR,
277 .con_in = EFI_INVALID_TABLE_ADDR,
278 .con_out_handle = EFI_INVALID_TABLE_ADDR,
279 .con_out = EFI_INVALID_TABLE_ADDR,
280 .stderr_handle = EFI_INVALID_TABLE_ADDR,
281 .stderr = EFI_INVALID_TABLE_ADDR,
282 .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
283
284 .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
285
286 .nr_tables = 0,
287 .tables = EFI_INVALID_TABLE_ADDR
288};
289
290static const struct efi efi_xen __initconst = {
291 .systab = NULL,
292 .runtime_version = 0,
293 .mps = EFI_INVALID_TABLE_ADDR,
294 .acpi = EFI_INVALID_TABLE_ADDR,
295 .acpi20 = EFI_INVALID_TABLE_ADDR,
296 .smbios = EFI_INVALID_TABLE_ADDR,
297 .smbios3 = EFI_INVALID_TABLE_ADDR,
298 .sal_systab = EFI_INVALID_TABLE_ADDR,
299 .boot_info = EFI_INVALID_TABLE_ADDR,
300 .hcdp = EFI_INVALID_TABLE_ADDR,
301 .uga = EFI_INVALID_TABLE_ADDR,
302 .uv_systab = EFI_INVALID_TABLE_ADDR,
303 .fw_vendor = EFI_INVALID_TABLE_ADDR,
304 .runtime = EFI_INVALID_TABLE_ADDR,
305 .config_table = EFI_INVALID_TABLE_ADDR,
306 .get_time = xen_efi_get_time,
307 .set_time = xen_efi_set_time,
308 .get_wakeup_time = xen_efi_get_wakeup_time,
309 .set_wakeup_time = xen_efi_set_wakeup_time,
310 .get_variable = xen_efi_get_variable,
311 .get_next_variable = xen_efi_get_next_variable,
312 .set_variable = xen_efi_set_variable,
313 .query_variable_info = xen_efi_query_variable_info,
314 .update_capsule = xen_efi_update_capsule,
315 .query_capsule_caps = xen_efi_query_capsule_caps,
316 .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
317 .reset_system = NULL,
318 .set_virtual_address_map = NULL,
319 .memmap = NULL,
320 .flags = 0
321};
322
323efi_system_table_t __init *xen_efi_probe(void)
324{
325 struct xen_platform_op op = {
326 .cmd = XENPF_firmware_info,
327 .u.firmware_info = {
328 .type = XEN_FW_EFI_INFO,
329 .index = XEN_FW_EFI_CONFIG_TABLE
330 }
331 };
332 union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
333
334 if (!xen_initial_domain() || HYPERVISOR_dom0_op(&op) < 0)
335 return NULL;
336
337
338
339 efi = efi_xen;
340
341 efi_systab_xen.tables = info->cfg.addr;
342 efi_systab_xen.nr_tables = info->cfg.nent;
343
344 op.cmd = XENPF_firmware_info;
345 op.u.firmware_info.type = XEN_FW_EFI_INFO;
346 op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
347 info->vendor.bufsz = sizeof(vendor);
348 set_xen_guest_handle(info->vendor.name, vendor);
349
350 if (HYPERVISOR_dom0_op(&op) == 0) {
351 efi_systab_xen.fw_vendor = __pa_symbol(vendor);
352 efi_systab_xen.fw_revision = info->vendor.revision;
353 } else
354 efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
355
356 op.cmd = XENPF_firmware_info;
357 op.u.firmware_info.type = XEN_FW_EFI_INFO;
358 op.u.firmware_info.index = XEN_FW_EFI_VERSION;
359
360 if (HYPERVISOR_dom0_op(&op) == 0)
361 efi_systab_xen.hdr.revision = info->version;
362
363 op.cmd = XENPF_firmware_info;
364 op.u.firmware_info.type = XEN_FW_EFI_INFO;
365 op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
366
367 if (HYPERVISOR_dom0_op(&op) == 0)
368 efi.runtime_version = info->version;
369
370 return &efi_systab_xen;
371}
372
