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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * EFI support for Xen.
4 *
5 * Copyright (C) 1999 VA Linux Systems
6 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
7 * Copyright (C) 1999-2002 Hewlett-Packard Co.
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Stephane Eranian <eranian@hpl.hp.com>
10 * Copyright (C) 2005-2008 Intel Co.
11 * Fenghua Yu <fenghua.yu@intel.com>
12 * Bibo Mao <bibo.mao@intel.com>
13 * Chandramouli Narayanan <mouli@linux.intel.com>
14 * Huang Ying <ying.huang@intel.com>
15 * Copyright (C) 2011 Novell Co.
16 * Jan Beulich <JBeulich@suse.com>
17 * Copyright (C) 2011-2012 Oracle Co.
18 * Liang Tang <liang.tang@oracle.com>
19 * Copyright (c) 2014 Oracle Co., Daniel Kiper
20 */
21
22#include <linux/bug.h>
23#include <linux/efi.h>
24#include <linux/init.h>
25#include <linux/string.h>
26
27#include <xen/interface/xen.h>
28#include <xen/interface/platform.h>
29#include <xen/page.h>
30#include <xen/xen.h>
31#include <xen/xen-ops.h>
32
33#include <asm/page.h>
34
35#include <asm/xen/hypercall.h>
36
37#define INIT_EFI_OP(name) \
38 {.cmd = XENPF_efi_runtime_call, \
39 .u.efi_runtime_call.function = XEN_EFI_##name, \
40 .u.efi_runtime_call.misc = 0}
41
42#define efi_data(op) (op.u.efi_runtime_call)
43
44static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
45{
46 struct xen_platform_op op = INIT_EFI_OP(get_time);
47
48 if (HYPERVISOR_platform_op(&op) < 0)
49 return EFI_UNSUPPORTED;
50
51 if (tm) {
52 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
53 memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
54 }
55
56 if (tc) {
57 tc->resolution = efi_data(op).u.get_time.resolution;
58 tc->accuracy = efi_data(op).u.get_time.accuracy;
59 tc->sets_to_zero = !!(efi_data(op).misc &
60 XEN_EFI_GET_TIME_SET_CLEARS_NS);
61 }
62
63 return efi_data(op).status;
64}
65
66static efi_status_t xen_efi_set_time(efi_time_t *tm)
67{
68 struct xen_platform_op op = INIT_EFI_OP(set_time);
69
70 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
71 memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
72
73 if (HYPERVISOR_platform_op(&op) < 0)
74 return EFI_UNSUPPORTED;
75
76 return efi_data(op).status;
77}
78
79static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
80 efi_bool_t *pending,
81 efi_time_t *tm)
82{
83 struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
84
85 if (HYPERVISOR_platform_op(&op) < 0)
86 return EFI_UNSUPPORTED;
87
88 if (tm) {
89 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
90 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
91 }
92
93 if (enabled)
94 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
95
96 if (pending)
97 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
98
99 return efi_data(op).status;
100}
101
102static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
103{
104 struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
105
106 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
107 if (enabled)
108 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
109 if (tm)
110 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
111 else
112 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
113
114 if (HYPERVISOR_platform_op(&op) < 0)
115 return EFI_UNSUPPORTED;
116
117 return efi_data(op).status;
118}
119
120static efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
121 u32 *attr, unsigned long *data_size,
122 void *data)
123{
124 struct xen_platform_op op = INIT_EFI_OP(get_variable);
125
126 set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
127 BUILD_BUG_ON(sizeof(*vendor) !=
128 sizeof(efi_data(op).u.get_variable.vendor_guid));
129 memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
130 efi_data(op).u.get_variable.size = *data_size;
131 set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
132
133 if (HYPERVISOR_platform_op(&op) < 0)
134 return EFI_UNSUPPORTED;
135
136 *data_size = efi_data(op).u.get_variable.size;
137 if (attr)
138 *attr = efi_data(op).misc;
139
140 return efi_data(op).status;
141}
142
143static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
144 efi_char16_t *name,
145 efi_guid_t *vendor)
146{
147 struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
148
149 efi_data(op).u.get_next_variable_name.size = *name_size;
150 set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
151 BUILD_BUG_ON(sizeof(*vendor) !=
152 sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
153 memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
154 sizeof(*vendor));
155
156 if (HYPERVISOR_platform_op(&op) < 0)
157 return EFI_UNSUPPORTED;
158
159 *name_size = efi_data(op).u.get_next_variable_name.size;
160 memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
161 sizeof(*vendor));
162
163 return efi_data(op).status;
164}
165
166static efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
167 u32 attr, unsigned long data_size,
168 void *data)
169{
170 struct xen_platform_op op = INIT_EFI_OP(set_variable);
171
172 set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
173 efi_data(op).misc = attr;
174 BUILD_BUG_ON(sizeof(*vendor) !=
175 sizeof(efi_data(op).u.set_variable.vendor_guid));
176 memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
177 efi_data(op).u.set_variable.size = data_size;
178 set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
179
180 if (HYPERVISOR_platform_op(&op) < 0)
181 return EFI_UNSUPPORTED;
182
183 return efi_data(op).status;
184}
185
186static efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
187 u64 *remaining_space,
188 u64 *max_variable_size)
189{
190 struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
191
192 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
193 return EFI_UNSUPPORTED;
194
195 efi_data(op).u.query_variable_info.attr = attr;
196
197 if (HYPERVISOR_platform_op(&op) < 0)
198 return EFI_UNSUPPORTED;
199
200 *storage_space = efi_data(op).u.query_variable_info.max_store_size;
201 *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
202 *max_variable_size = efi_data(op).u.query_variable_info.max_size;
203
204 return efi_data(op).status;
205}
206
207static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
208{
209 struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
210
211 if (HYPERVISOR_platform_op(&op) < 0)
212 return EFI_UNSUPPORTED;
213
214 *count = efi_data(op).misc;
215
216 return efi_data(op).status;
217}
218
219static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
220 unsigned long count, unsigned long sg_list)
221{
222 struct xen_platform_op op = INIT_EFI_OP(update_capsule);
223
224 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
225 return EFI_UNSUPPORTED;
226
227 set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
228 capsules);
229 efi_data(op).u.update_capsule.capsule_count = count;
230 efi_data(op).u.update_capsule.sg_list = sg_list;
231
232 if (HYPERVISOR_platform_op(&op) < 0)
233 return EFI_UNSUPPORTED;
234
235 return efi_data(op).status;
236}
237
238static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
239 unsigned long count, u64 *max_size, int *reset_type)
240{
241 struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
242
243 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
244 return EFI_UNSUPPORTED;
245
246 set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
247 capsules);
248 efi_data(op).u.query_capsule_capabilities.capsule_count = count;
249
250 if (HYPERVISOR_platform_op(&op) < 0)
251 return EFI_UNSUPPORTED;
252
253 *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
254 *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
255
256 return efi_data(op).status;
257}
258
259static void xen_efi_reset_system(int reset_type, efi_status_t status,
260 unsigned long data_size, efi_char16_t *data)
261{
262 switch (reset_type) {
263 case EFI_RESET_COLD:
264 case EFI_RESET_WARM:
265 xen_reboot(SHUTDOWN_reboot);
266 break;
267 case EFI_RESET_SHUTDOWN:
268 xen_reboot(SHUTDOWN_poweroff);
269 break;
270 default:
271 BUG();
272 }
273}
274
275/*
276 * Set XEN EFI runtime services function pointers. Other fields of struct efi,
277 * e.g. efi.systab, will be set like normal EFI.
278 */
279void __init xen_efi_runtime_setup(void)
280{
281 efi.get_time = xen_efi_get_time;
282 efi.set_time = xen_efi_set_time;
283 efi.get_wakeup_time = xen_efi_get_wakeup_time;
284 efi.set_wakeup_time = xen_efi_set_wakeup_time;
285 efi.get_variable = xen_efi_get_variable;
286 efi.get_next_variable = xen_efi_get_next_variable;
287 efi.set_variable = xen_efi_set_variable;
288 efi.set_variable_nonblocking = xen_efi_set_variable;
289 efi.query_variable_info = xen_efi_query_variable_info;
290 efi.query_variable_info_nonblocking = xen_efi_query_variable_info;
291 efi.update_capsule = xen_efi_update_capsule;
292 efi.query_capsule_caps = xen_efi_query_capsule_caps;
293 efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
294 efi.reset_system = xen_efi_reset_system;
295}
296
297int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
298{
299 static_assert(XEN_PAGE_SHIFT == EFI_PAGE_SHIFT,
300 "Mismatch between EFI_PAGE_SHIFT and XEN_PAGE_SHIFT");
301 struct xen_platform_op op;
302 union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
303 int rc;
304
305 if (!efi_enabled(EFI_PARAVIRT) || efi_enabled(EFI_MEMMAP))
306 return __efi_mem_desc_lookup(phys_addr, out_md);
307 phys_addr &= ~(u64)(EFI_PAGE_SIZE - 1);
308 op = (struct xen_platform_op) {
309 .cmd = XENPF_firmware_info,
310 .u.firmware_info = {
311 .type = XEN_FW_EFI_INFO,
312 .index = XEN_FW_EFI_MEM_INFO,
313 .u.efi_info.mem.addr = phys_addr,
314 .u.efi_info.mem.size = U64_MAX - phys_addr,
315 },
316 };
317
318 rc = HYPERVISOR_platform_op(&op);
319 if (rc) {
320 pr_warn("Failed to lookup header 0x%llx in Xen memory map: error %d\n",
321 phys_addr, rc);
322 }
323
324 out_md->phys_addr = info->mem.addr;
325 out_md->num_pages = info->mem.size >> EFI_PAGE_SHIFT;
326 out_md->type = info->mem.type;
327 out_md->attribute = info->mem.attr;
328
329 return 0;
330}
331
332bool __init xen_efi_config_table_is_usable(const efi_guid_t *guid,
333 unsigned long table)
334{
335 efi_memory_desc_t md;
336 int rc;
337
338 if (!efi_enabled(EFI_PARAVIRT))
339 return true;
340
341 rc = efi_mem_desc_lookup(table, &md);
342 if (rc)
343 return false;
344
345 switch (md.type) {
346 case EFI_RUNTIME_SERVICES_CODE:
347 case EFI_RUNTIME_SERVICES_DATA:
348 case EFI_ACPI_RECLAIM_MEMORY:
349 case EFI_ACPI_MEMORY_NVS:
350 case EFI_RESERVED_TYPE:
351 return true;
352 default:
353 return false;
354 }
355}
1/*
2 * EFI support for Xen.
3 *
4 * Copyright (C) 1999 VA Linux Systems
5 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
6 * Copyright (C) 1999-2002 Hewlett-Packard Co.
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Stephane Eranian <eranian@hpl.hp.com>
9 * Copyright (C) 2005-2008 Intel Co.
10 * Fenghua Yu <fenghua.yu@intel.com>
11 * Bibo Mao <bibo.mao@intel.com>
12 * Chandramouli Narayanan <mouli@linux.intel.com>
13 * Huang Ying <ying.huang@intel.com>
14 * Copyright (C) 2011 Novell Co.
15 * Jan Beulich <JBeulich@suse.com>
16 * Copyright (C) 2011-2012 Oracle Co.
17 * Liang Tang <liang.tang@oracle.com>
18 * Copyright (c) 2014 Oracle Co., Daniel Kiper
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_platform_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_platform_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_platform_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_platform_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_platform_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_platform_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_platform_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_platform_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_platform_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_platform_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_platform_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, /* Initialized later. */
270 .headersize = 0, /* Ignored by Linux Kernel. */
271 .crc32 = 0, /* Ignored by Linux Kernel. */
272 .reserved = 0
273 },
274 .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */
275 .fw_revision = 0, /* Initialized later. */
276 .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
277 .con_in = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
278 .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
279 .con_out = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
280 .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
281 .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
282 .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
283 /* Not used under Xen. */
284 .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
285 /* Not used under Xen. */
286 .nr_tables = 0, /* Initialized later. */
287 .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */
288};
289
290static const struct efi efi_xen __initconst = {
291 .systab = NULL, /* Initialized later. */
292 .runtime_version = 0, /* Initialized later. */
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, /* Functionality provided by Xen. */
318 .set_virtual_address_map = NULL, /* Not used under Xen. */
319 .memmap = NULL, /* Not used under Xen. */
320 .flags = 0 /* Initialized later. */
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_platform_op(&op) < 0)
335 return NULL;
336
337 /* Here we know that Xen runs on EFI platform. */
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_platform_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_platform_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_platform_op(&op) == 0)
368 efi.runtime_version = info->version;
369
370 return &efi_systab_xen;
371}