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 #include <xen/xen-ops.h>
30 
31 #include <asm/page.h>
32 
33 #include <asm/xen/hypercall.h>
34 
35 #define INIT_EFI_OP(name) \
36 	{.cmd = XENPF_efi_runtime_call, \
37 	 .u.efi_runtime_call.function = XEN_EFI_##name, \
38 	 .u.efi_runtime_call.misc = 0}
39 
40 #define efi_data(op)	(op.u.efi_runtime_call)
41 
xen_efi_get_time(efi_time_t * tm,efi_time_cap_t * tc)42 efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
43 {
44 	struct xen_platform_op op = INIT_EFI_OP(get_time);
45 
46 	if (HYPERVISOR_platform_op(&op) < 0)
47 		return EFI_UNSUPPORTED;
48 
49 	if (tm) {
50 		BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
51 		memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
52 	}
53 
54 	if (tc) {
55 		tc->resolution = efi_data(op).u.get_time.resolution;
56 		tc->accuracy = efi_data(op).u.get_time.accuracy;
57 		tc->sets_to_zero = !!(efi_data(op).misc &
58 				      XEN_EFI_GET_TIME_SET_CLEARS_NS);
59 	}
60 
61 	return efi_data(op).status;
62 }
63 EXPORT_SYMBOL_GPL(xen_efi_get_time);
64 
xen_efi_set_time(efi_time_t * tm)65 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 EXPORT_SYMBOL_GPL(xen_efi_set_time);
78 
xen_efi_get_wakeup_time(efi_bool_t * enabled,efi_bool_t * pending,efi_time_t * tm)79 efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, 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 EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time);
101 
xen_efi_set_wakeup_time(efi_bool_t enabled,efi_time_t * tm)102 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 EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time);
120 
xen_efi_get_variable(efi_char16_t * name,efi_guid_t * vendor,u32 * attr,unsigned long * data_size,void * data)121 efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
122 				  u32 *attr, unsigned long *data_size,
123 				  void *data)
124 {
125 	struct xen_platform_op op = INIT_EFI_OP(get_variable);
126 
127 	set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
128 	BUILD_BUG_ON(sizeof(*vendor) !=
129 		     sizeof(efi_data(op).u.get_variable.vendor_guid));
130 	memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
131 	efi_data(op).u.get_variable.size = *data_size;
132 	set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
133 
134 	if (HYPERVISOR_platform_op(&op) < 0)
135 		return EFI_UNSUPPORTED;
136 
137 	*data_size = efi_data(op).u.get_variable.size;
138 	if (attr)
139 		*attr = efi_data(op).misc;
140 
141 	return efi_data(op).status;
142 }
143 EXPORT_SYMBOL_GPL(xen_efi_get_variable);
144 
xen_efi_get_next_variable(unsigned long * name_size,efi_char16_t * name,efi_guid_t * vendor)145 efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
146 				       efi_char16_t *name,
147 				       efi_guid_t *vendor)
148 {
149 	struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
150 
151 	efi_data(op).u.get_next_variable_name.size = *name_size;
152 	set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
153 	BUILD_BUG_ON(sizeof(*vendor) !=
154 		     sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
155 	memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
156 	       sizeof(*vendor));
157 
158 	if (HYPERVISOR_platform_op(&op) < 0)
159 		return EFI_UNSUPPORTED;
160 
161 	*name_size = efi_data(op).u.get_next_variable_name.size;
162 	memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
163 	       sizeof(*vendor));
164 
165 	return efi_data(op).status;
166 }
167 EXPORT_SYMBOL_GPL(xen_efi_get_next_variable);
168 
xen_efi_set_variable(efi_char16_t * name,efi_guid_t * vendor,u32 attr,unsigned long data_size,void * data)169 efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
170 				 u32 attr, unsigned long data_size,
171 				 void *data)
172 {
173 	struct xen_platform_op op = INIT_EFI_OP(set_variable);
174 
175 	set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
176 	efi_data(op).misc = attr;
177 	BUILD_BUG_ON(sizeof(*vendor) !=
178 		     sizeof(efi_data(op).u.set_variable.vendor_guid));
179 	memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
180 	efi_data(op).u.set_variable.size = data_size;
181 	set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
182 
183 	if (HYPERVISOR_platform_op(&op) < 0)
184 		return EFI_UNSUPPORTED;
185 
186 	return efi_data(op).status;
187 }
188 EXPORT_SYMBOL_GPL(xen_efi_set_variable);
189 
xen_efi_query_variable_info(u32 attr,u64 * storage_space,u64 * remaining_space,u64 * max_variable_size)190 efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
191 					 u64 *remaining_space,
192 					 u64 *max_variable_size)
193 {
194 	struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
195 
196 	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
197 		return EFI_UNSUPPORTED;
198 
199 	efi_data(op).u.query_variable_info.attr = attr;
200 
201 	if (HYPERVISOR_platform_op(&op) < 0)
202 		return EFI_UNSUPPORTED;
203 
204 	*storage_space = efi_data(op).u.query_variable_info.max_store_size;
205 	*remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
206 	*max_variable_size = efi_data(op).u.query_variable_info.max_size;
207 
208 	return efi_data(op).status;
209 }
210 EXPORT_SYMBOL_GPL(xen_efi_query_variable_info);
211 
xen_efi_get_next_high_mono_count(u32 * count)212 efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
213 {
214 	struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
215 
216 	if (HYPERVISOR_platform_op(&op) < 0)
217 		return EFI_UNSUPPORTED;
218 
219 	*count = efi_data(op).misc;
220 
221 	return efi_data(op).status;
222 }
223 EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count);
224 
xen_efi_update_capsule(efi_capsule_header_t ** capsules,unsigned long count,unsigned long sg_list)225 efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
226 				    unsigned long count, unsigned long sg_list)
227 {
228 	struct xen_platform_op op = INIT_EFI_OP(update_capsule);
229 
230 	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
231 		return EFI_UNSUPPORTED;
232 
233 	set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
234 			     capsules);
235 	efi_data(op).u.update_capsule.capsule_count = count;
236 	efi_data(op).u.update_capsule.sg_list = sg_list;
237 
238 	if (HYPERVISOR_platform_op(&op) < 0)
239 		return EFI_UNSUPPORTED;
240 
241 	return efi_data(op).status;
242 }
243 EXPORT_SYMBOL_GPL(xen_efi_update_capsule);
244 
xen_efi_query_capsule_caps(efi_capsule_header_t ** capsules,unsigned long count,u64 * max_size,int * reset_type)245 efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
246 					unsigned long count, u64 *max_size,
247 					int *reset_type)
248 {
249 	struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
250 
251 	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
252 		return EFI_UNSUPPORTED;
253 
254 	set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
255 					capsules);
256 	efi_data(op).u.query_capsule_capabilities.capsule_count = count;
257 
258 	if (HYPERVISOR_platform_op(&op) < 0)
259 		return EFI_UNSUPPORTED;
260 
261 	*max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
262 	*reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
263 
264 	return efi_data(op).status;
265 }
266 EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);
267 
xen_efi_reset_system(int reset_type,efi_status_t status,unsigned long data_size,efi_char16_t * data)268 void xen_efi_reset_system(int reset_type, efi_status_t status,
269 			  unsigned long data_size, efi_char16_t *data)
270 {
271 	switch (reset_type) {
272 	case EFI_RESET_COLD:
273 	case EFI_RESET_WARM:
274 		xen_reboot(SHUTDOWN_reboot);
275 		break;
276 	case EFI_RESET_SHUTDOWN:
277 		xen_reboot(SHUTDOWN_poweroff);
278 		break;
279 	default:
280 		BUG();
281 	}
282 }
283 EXPORT_SYMBOL_GPL(xen_efi_reset_system);
284