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be81c8a1 DK |
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/xen/hypercall.h> | |
31 | ||
32 | #define INIT_EFI_OP(name) \ | |
33 | {.cmd = XENPF_efi_runtime_call, \ | |
34 | .u.efi_runtime_call.function = XEN_EFI_##name, \ | |
35 | .u.efi_runtime_call.misc = 0} | |
36 | ||
37 | #define efi_data(op) (op.u.efi_runtime_call) | |
38 | ||
39 | static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) | |
40 | { | |
41 | struct xen_platform_op op = INIT_EFI_OP(get_time); | |
42 | ||
43 | if (HYPERVISOR_dom0_op(&op) < 0) | |
44 | return EFI_UNSUPPORTED; | |
45 | ||
46 | if (tm) { | |
47 | BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time)); | |
48 | memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm)); | |
49 | } | |
50 | ||
51 | if (tc) { | |
52 | tc->resolution = efi_data(op).u.get_time.resolution; | |
53 | tc->accuracy = efi_data(op).u.get_time.accuracy; | |
54 | tc->sets_to_zero = !!(efi_data(op).misc & | |
55 | XEN_EFI_GET_TIME_SET_CLEARS_NS); | |
56 | } | |
57 | ||
58 | return efi_data(op).status; | |
59 | } | |
60 | ||
61 | static efi_status_t xen_efi_set_time(efi_time_t *tm) | |
62 | { | |
63 | struct xen_platform_op op = INIT_EFI_OP(set_time); | |
64 | ||
65 | BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time)); | |
66 | memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm)); | |
67 | ||
68 | if (HYPERVISOR_dom0_op(&op) < 0) | |
69 | return EFI_UNSUPPORTED; | |
70 | ||
71 | return efi_data(op).status; | |
72 | } | |
73 | ||
74 | static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, | |
75 | efi_bool_t *pending, | |
76 | efi_time_t *tm) | |
77 | { | |
78 | struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time); | |
79 | ||
80 | if (HYPERVISOR_dom0_op(&op) < 0) | |
81 | return EFI_UNSUPPORTED; | |
82 | ||
83 | if (tm) { | |
84 | BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time)); | |
85 | memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm)); | |
86 | } | |
87 | ||
88 | if (enabled) | |
89 | *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED); | |
90 | ||
91 | if (pending) | |
92 | *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING); | |
93 | ||
94 | return efi_data(op).status; | |
95 | } | |
96 | ||
97 | static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) | |
98 | { | |
99 | struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time); | |
100 | ||
101 | BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time)); | |
102 | if (enabled) | |
103 | efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE; | |
104 | if (tm) | |
105 | memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm)); | |
106 | else | |
107 | efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY; | |
108 | ||
109 | if (HYPERVISOR_dom0_op(&op) < 0) | |
110 | return EFI_UNSUPPORTED; | |
111 | ||
112 | return efi_data(op).status; | |
113 | } | |
114 | ||
115 | static efi_status_t xen_efi_get_variable(efi_char16_t *name, | |
116 | efi_guid_t *vendor, | |
117 | u32 *attr, | |
118 | unsigned long *data_size, | |
119 | void *data) | |
120 | { | |
121 | struct xen_platform_op op = INIT_EFI_OP(get_variable); | |
122 | ||
123 | set_xen_guest_handle(efi_data(op).u.get_variable.name, name); | |
124 | BUILD_BUG_ON(sizeof(*vendor) != | |
125 | sizeof(efi_data(op).u.get_variable.vendor_guid)); | |
126 | memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor)); | |
127 | efi_data(op).u.get_variable.size = *data_size; | |
128 | set_xen_guest_handle(efi_data(op).u.get_variable.data, data); | |
129 | ||
130 | if (HYPERVISOR_dom0_op(&op) < 0) | |
131 | return EFI_UNSUPPORTED; | |
132 | ||
133 | *data_size = efi_data(op).u.get_variable.size; | |
134 | if (attr) | |
135 | *attr = efi_data(op).misc; | |
136 | ||
137 | return efi_data(op).status; | |
138 | } | |
139 | ||
140 | static efi_status_t xen_efi_get_next_variable(unsigned long *name_size, | |
141 | efi_char16_t *name, | |
142 | efi_guid_t *vendor) | |
143 | { | |
144 | struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name); | |
145 | ||
146 | efi_data(op).u.get_next_variable_name.size = *name_size; | |
147 | set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name); | |
148 | BUILD_BUG_ON(sizeof(*vendor) != | |
149 | sizeof(efi_data(op).u.get_next_variable_name.vendor_guid)); | |
150 | memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor, | |
151 | sizeof(*vendor)); | |
152 | ||
153 | if (HYPERVISOR_dom0_op(&op) < 0) | |
154 | return EFI_UNSUPPORTED; | |
155 | ||
156 | *name_size = efi_data(op).u.get_next_variable_name.size; | |
157 | memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid, | |
158 | sizeof(*vendor)); | |
159 | ||
160 | return efi_data(op).status; | |
161 | } | |
162 | ||
163 | static efi_status_t xen_efi_set_variable(efi_char16_t *name, | |
164 | efi_guid_t *vendor, | |
165 | u32 attr, | |
166 | 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_dom0_op(&op) < 0) | |
180 | return EFI_UNSUPPORTED; | |
181 | ||
182 | return efi_data(op).status; | |
183 | } | |
184 | ||
185 | static efi_status_t xen_efi_query_variable_info(u32 attr, | |
186 | 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_dom0_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 | ||
207 | static 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_dom0_op(&op) < 0) | |
212 | return EFI_UNSUPPORTED; | |
213 | ||
214 | *count = efi_data(op).misc; | |
215 | ||
216 | return efi_data(op).status; | |
217 | } | |
218 | ||
219 | static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules, | |
220 | unsigned long count, | |
221 | unsigned long sg_list) | |
222 | { | |
223 | struct xen_platform_op op = INIT_EFI_OP(update_capsule); | |
224 | ||
225 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
226 | return EFI_UNSUPPORTED; | |
227 | ||
228 | set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array, | |
229 | capsules); | |
230 | efi_data(op).u.update_capsule.capsule_count = count; | |
231 | efi_data(op).u.update_capsule.sg_list = sg_list; | |
232 | ||
233 | if (HYPERVISOR_dom0_op(&op) < 0) | |
234 | return EFI_UNSUPPORTED; | |
235 | ||
236 | return efi_data(op).status; | |
237 | } | |
238 | ||
239 | static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules, | |
240 | unsigned long count, | |
241 | u64 *max_size, | |
242 | int *reset_type) | |
243 | { | |
244 | struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities); | |
245 | ||
246 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) | |
247 | return EFI_UNSUPPORTED; | |
248 | ||
249 | set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array, | |
250 | capsules); | |
251 | efi_data(op).u.query_capsule_capabilities.capsule_count = count; | |
252 | ||
253 | if (HYPERVISOR_dom0_op(&op) < 0) | |
254 | return EFI_UNSUPPORTED; | |
255 | ||
256 | *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size; | |
257 | *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type; | |
258 | ||
259 | return efi_data(op).status; | |
260 | } | |
261 | ||
262 | static efi_char16_t vendor[100] __initdata; | |
263 | ||
264 | static efi_system_table_t efi_systab_xen __initdata = { | |
265 | .hdr = { | |
266 | .signature = EFI_SYSTEM_TABLE_SIGNATURE, | |
267 | .revision = 0, /* Initialized later. */ | |
268 | .headersize = 0, /* Ignored by Linux Kernel. */ | |
269 | .crc32 = 0, /* Ignored by Linux Kernel. */ | |
270 | .reserved = 0 | |
271 | }, | |
272 | .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */ | |
273 | .fw_revision = 0, /* Initialized later. */ | |
274 | .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
275 | .con_in = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
276 | .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
277 | .con_out = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
278 | .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
279 | .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ | |
280 | .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR, | |
281 | /* Not used under Xen. */ | |
282 | .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR, | |
283 | /* Not used under Xen. */ | |
284 | .nr_tables = 0, /* Initialized later. */ | |
285 | .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */ | |
286 | }; | |
287 | ||
288 | static const struct efi efi_xen __initconst = { | |
289 | .systab = NULL, /* Initialized later. */ | |
290 | .runtime_version = 0, /* Initialized later. */ | |
291 | .mps = EFI_INVALID_TABLE_ADDR, | |
292 | .acpi = EFI_INVALID_TABLE_ADDR, | |
293 | .acpi20 = EFI_INVALID_TABLE_ADDR, | |
294 | .smbios = EFI_INVALID_TABLE_ADDR, | |
295 | .sal_systab = EFI_INVALID_TABLE_ADDR, | |
296 | .boot_info = EFI_INVALID_TABLE_ADDR, | |
297 | .hcdp = EFI_INVALID_TABLE_ADDR, | |
298 | .uga = EFI_INVALID_TABLE_ADDR, | |
299 | .uv_systab = EFI_INVALID_TABLE_ADDR, | |
300 | .fw_vendor = EFI_INVALID_TABLE_ADDR, | |
301 | .runtime = EFI_INVALID_TABLE_ADDR, | |
302 | .config_table = EFI_INVALID_TABLE_ADDR, | |
303 | .get_time = xen_efi_get_time, | |
304 | .set_time = xen_efi_set_time, | |
305 | .get_wakeup_time = xen_efi_get_wakeup_time, | |
306 | .set_wakeup_time = xen_efi_set_wakeup_time, | |
307 | .get_variable = xen_efi_get_variable, | |
308 | .get_next_variable = xen_efi_get_next_variable, | |
309 | .set_variable = xen_efi_set_variable, | |
310 | .query_variable_info = xen_efi_query_variable_info, | |
311 | .update_capsule = xen_efi_update_capsule, | |
312 | .query_capsule_caps = xen_efi_query_capsule_caps, | |
313 | .get_next_high_mono_count = xen_efi_get_next_high_mono_count, | |
314 | .reset_system = NULL, /* Functionality provided by Xen. */ | |
315 | .set_virtual_address_map = NULL, /* Not used under Xen. */ | |
316 | .memmap = NULL, /* Not used under Xen. */ | |
317 | .flags = 0 /* Initialized later. */ | |
318 | }; | |
319 | ||
320 | efi_system_table_t __init *xen_efi_probe(void) | |
321 | { | |
322 | struct xen_platform_op op = { | |
323 | .cmd = XENPF_firmware_info, | |
324 | .u.firmware_info = { | |
325 | .type = XEN_FW_EFI_INFO, | |
326 | .index = XEN_FW_EFI_CONFIG_TABLE | |
327 | } | |
328 | }; | |
329 | union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info; | |
330 | ||
331 | if (!xen_initial_domain() || HYPERVISOR_dom0_op(&op) < 0) | |
332 | return NULL; | |
333 | ||
334 | /* Here we know that Xen runs on EFI platform. */ | |
335 | ||
336 | efi = efi_xen; | |
337 | ||
338 | efi_systab_xen.tables = info->cfg.addr; | |
339 | efi_systab_xen.nr_tables = info->cfg.nent; | |
340 | ||
341 | op.cmd = XENPF_firmware_info; | |
342 | op.u.firmware_info.type = XEN_FW_EFI_INFO; | |
343 | op.u.firmware_info.index = XEN_FW_EFI_VENDOR; | |
344 | info->vendor.bufsz = sizeof(vendor); | |
345 | set_xen_guest_handle(info->vendor.name, vendor); | |
346 | ||
347 | if (HYPERVISOR_dom0_op(&op) == 0) { | |
348 | efi_systab_xen.fw_vendor = __pa_symbol(vendor); | |
349 | efi_systab_xen.fw_revision = info->vendor.revision; | |
350 | } else | |
351 | efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN"); | |
352 | ||
353 | op.cmd = XENPF_firmware_info; | |
354 | op.u.firmware_info.type = XEN_FW_EFI_INFO; | |
355 | op.u.firmware_info.index = XEN_FW_EFI_VERSION; | |
356 | ||
357 | if (HYPERVISOR_dom0_op(&op) == 0) | |
358 | efi_systab_xen.hdr.revision = info->version; | |
359 | ||
360 | op.cmd = XENPF_firmware_info; | |
361 | op.u.firmware_info.type = XEN_FW_EFI_INFO; | |
362 | op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION; | |
363 | ||
364 | if (HYPERVISOR_dom0_op(&op) == 0) | |
365 | efi.runtime_version = info->version; | |
366 | ||
367 | return &efi_systab_xen; | |
368 | } |