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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
41efi_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}
62EXPORT_SYMBOL_GPL(xen_efi_get_time);
63
64efi_status_t xen_efi_set_time(efi_time_t *tm)
65{
66 struct xen_platform_op op = INIT_EFI_OP(set_time);
67
68 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
69 memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
70
71 if (HYPERVISOR_platform_op(&op) < 0)
72 return EFI_UNSUPPORTED;
73
74 return efi_data(op).status;
75}
76EXPORT_SYMBOL_GPL(xen_efi_set_time);
77
78efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
79 efi_time_t *tm)
80{
81 struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
82
83 if (HYPERVISOR_platform_op(&op) < 0)
84 return EFI_UNSUPPORTED;
85
86 if (tm) {
87 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
88 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
89 }
90
91 if (enabled)
92 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
93
94 if (pending)
95 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
96
97 return efi_data(op).status;
98}
99EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time);
100
101efi_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}
118EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time);
119
120efi_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}
142EXPORT_SYMBOL_GPL(xen_efi_get_variable);
143
144efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
145 efi_char16_t *name,
146 efi_guid_t *vendor)
147{
148 struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
149
150 efi_data(op).u.get_next_variable_name.size = *name_size;
151 set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
152 BUILD_BUG_ON(sizeof(*vendor) !=
153 sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
154 memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
155 sizeof(*vendor));
156
157 if (HYPERVISOR_platform_op(&op) < 0)
158 return EFI_UNSUPPORTED;
159
160 *name_size = efi_data(op).u.get_next_variable_name.size;
161 memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
162 sizeof(*vendor));
163
164 return efi_data(op).status;
165}
166EXPORT_SYMBOL_GPL(xen_efi_get_next_variable);
167
168efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
169 u32 attr, unsigned long data_size,
170 void *data)
171{
172 struct xen_platform_op op = INIT_EFI_OP(set_variable);
173
174 set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
175 efi_data(op).misc = attr;
176 BUILD_BUG_ON(sizeof(*vendor) !=
177 sizeof(efi_data(op).u.set_variable.vendor_guid));
178 memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
179 efi_data(op).u.set_variable.size = data_size;
180 set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
181
182 if (HYPERVISOR_platform_op(&op) < 0)
183 return EFI_UNSUPPORTED;
184
185 return efi_data(op).status;
186}
187EXPORT_SYMBOL_GPL(xen_efi_set_variable);
188
189efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
190 u64 *remaining_space,
191 u64 *max_variable_size)
192{
193 struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
194
195 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
196 return EFI_UNSUPPORTED;
197
198 efi_data(op).u.query_variable_info.attr = attr;
199
200 if (HYPERVISOR_platform_op(&op) < 0)
201 return EFI_UNSUPPORTED;
202
203 *storage_space = efi_data(op).u.query_variable_info.max_store_size;
204 *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
205 *max_variable_size = efi_data(op).u.query_variable_info.max_size;
206
207 return efi_data(op).status;
208}
209EXPORT_SYMBOL_GPL(xen_efi_query_variable_info);
210
211efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
212{
213 struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
214
215 if (HYPERVISOR_platform_op(&op) < 0)
216 return EFI_UNSUPPORTED;
217
218 *count = efi_data(op).misc;
219
220 return efi_data(op).status;
221}
222EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count);
223
224efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
225 unsigned long count, unsigned long sg_list)
226{
227 struct xen_platform_op op = INIT_EFI_OP(update_capsule);
228
229 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
230 return EFI_UNSUPPORTED;
231
232 set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
233 capsules);
234 efi_data(op).u.update_capsule.capsule_count = count;
235 efi_data(op).u.update_capsule.sg_list = sg_list;
236
237 if (HYPERVISOR_platform_op(&op) < 0)
238 return EFI_UNSUPPORTED;
239
240 return efi_data(op).status;
241}
242EXPORT_SYMBOL_GPL(xen_efi_update_capsule);
243
244efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
245 unsigned long count, u64 *max_size,
246 int *reset_type)
247{
248 struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
249
250 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
251 return EFI_UNSUPPORTED;
252
253 set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
254 capsules);
255 efi_data(op).u.query_capsule_capabilities.capsule_count = count;
256
257 if (HYPERVISOR_platform_op(&op) < 0)
258 return EFI_UNSUPPORTED;
259
260 *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
261 *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
262
263 return efi_data(op).status;
264}
265EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);