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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/xen.h>
30#include <xen/xen-ops.h>
31
32#include <asm/page.h>
33
34#include <asm/xen/hypercall.h>
35
36#define INIT_EFI_OP(name) \
37 {.cmd = XENPF_efi_runtime_call, \
38 .u.efi_runtime_call.function = XEN_EFI_##name, \
39 .u.efi_runtime_call.misc = 0}
40
41#define efi_data(op) (op.u.efi_runtime_call)
42
43static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
44{
45 struct xen_platform_op op = INIT_EFI_OP(get_time);
46
47 if (HYPERVISOR_platform_op(&op) < 0)
48 return EFI_UNSUPPORTED;
49
50 if (tm) {
51 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
52 memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
53 }
54
55 if (tc) {
56 tc->resolution = efi_data(op).u.get_time.resolution;
57 tc->accuracy = efi_data(op).u.get_time.accuracy;
58 tc->sets_to_zero = !!(efi_data(op).misc &
59 XEN_EFI_GET_TIME_SET_CLEARS_NS);
60 }
61
62 return efi_data(op).status;
63}
64
65static efi_status_t xen_efi_set_time(efi_time_t *tm)
66{
67 struct xen_platform_op op = INIT_EFI_OP(set_time);
68
69 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
70 memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
71
72 if (HYPERVISOR_platform_op(&op) < 0)
73 return EFI_UNSUPPORTED;
74
75 return efi_data(op).status;
76}
77
78static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
79 efi_bool_t *pending,
80 efi_time_t *tm)
81{
82 struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
83
84 if (HYPERVISOR_platform_op(&op) < 0)
85 return EFI_UNSUPPORTED;
86
87 if (tm) {
88 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
89 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
90 }
91
92 if (enabled)
93 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
94
95 if (pending)
96 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
97
98 return efi_data(op).status;
99}
100
101static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
102{
103 struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
104
105 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
106 if (enabled)
107 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
108 if (tm)
109 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
110 else
111 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
112
113 if (HYPERVISOR_platform_op(&op) < 0)
114 return EFI_UNSUPPORTED;
115
116 return efi_data(op).status;
117}
118
119static efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
120 u32 *attr, 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, efi_guid_t *vendor,
166 u32 attr, unsigned long data_size,
167 void *data)
168{
169 struct xen_platform_op op = INIT_EFI_OP(set_variable);
170
171 set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
172 efi_data(op).misc = attr;
173 BUILD_BUG_ON(sizeof(*vendor) !=
174 sizeof(efi_data(op).u.set_variable.vendor_guid));
175 memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
176 efi_data(op).u.set_variable.size = data_size;
177 set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
178
179 if (HYPERVISOR_platform_op(&op) < 0)
180 return EFI_UNSUPPORTED;
181
182 return efi_data(op).status;
183}
184
185static efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
186 u64 *remaining_space,
187 u64 *max_variable_size)
188{
189 struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
190
191 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
192 return EFI_UNSUPPORTED;
193
194 efi_data(op).u.query_variable_info.attr = attr;
195
196 if (HYPERVISOR_platform_op(&op) < 0)
197 return EFI_UNSUPPORTED;
198
199 *storage_space = efi_data(op).u.query_variable_info.max_store_size;
200 *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
201 *max_variable_size = efi_data(op).u.query_variable_info.max_size;
202
203 return efi_data(op).status;
204}
205
206static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
207{
208 struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
209
210 if (HYPERVISOR_platform_op(&op) < 0)
211 return EFI_UNSUPPORTED;
212
213 *count = efi_data(op).misc;
214
215 return efi_data(op).status;
216}
217
218static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
219 unsigned long count, unsigned long sg_list)
220{
221 struct xen_platform_op op = INIT_EFI_OP(update_capsule);
222
223 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
224 return EFI_UNSUPPORTED;
225
226 set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
227 capsules);
228 efi_data(op).u.update_capsule.capsule_count = count;
229 efi_data(op).u.update_capsule.sg_list = sg_list;
230
231 if (HYPERVISOR_platform_op(&op) < 0)
232 return EFI_UNSUPPORTED;
233
234 return efi_data(op).status;
235}
236
237static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
238 unsigned long count, u64 *max_size, int *reset_type)
239{
240 struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
241
242 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
243 return EFI_UNSUPPORTED;
244
245 set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
246 capsules);
247 efi_data(op).u.query_capsule_capabilities.capsule_count = count;
248
249 if (HYPERVISOR_platform_op(&op) < 0)
250 return EFI_UNSUPPORTED;
251
252 *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
253 *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
254
255 return efi_data(op).status;
256}
257
258static void xen_efi_reset_system(int reset_type, efi_status_t status,
259 unsigned long data_size, efi_char16_t *data)
260{
261 switch (reset_type) {
262 case EFI_RESET_COLD:
263 case EFI_RESET_WARM:
264 xen_reboot(SHUTDOWN_reboot);
265 break;
266 case EFI_RESET_SHUTDOWN:
267 xen_reboot(SHUTDOWN_poweroff);
268 break;
269 default:
270 BUG();
271 }
272}
273
274/*
275 * Set XEN EFI runtime services function pointers. Other fields of struct efi,
276 * e.g. efi.systab, will be set like normal EFI.
277 */
278void __init xen_efi_runtime_setup(void)
279{
280 efi.get_time = xen_efi_get_time;
281 efi.set_time = xen_efi_set_time;
282 efi.get_wakeup_time = xen_efi_get_wakeup_time;
283 efi.set_wakeup_time = xen_efi_set_wakeup_time;
284 efi.get_variable = xen_efi_get_variable;
285 efi.get_next_variable = xen_efi_get_next_variable;
286 efi.set_variable = xen_efi_set_variable;
287 efi.set_variable_nonblocking = xen_efi_set_variable;
288 efi.query_variable_info = xen_efi_query_variable_info;
289 efi.query_variable_info_nonblocking = xen_efi_query_variable_info;
290 efi.update_capsule = xen_efi_update_capsule;
291 efi.query_capsule_caps = xen_efi_query_capsule_caps;
292 efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
293 efi.reset_system = xen_efi_reset_system;
294}