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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 | ||
342cd340 DK |
30 | #include <asm/page.h> |
31 | ||
be81c8a1 DK |
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 | ||
41 | static 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_dom0_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 | ||
63 | static 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_dom0_op(&op) < 0) | |
71 | return EFI_UNSUPPORTED; | |
72 | ||
73 | return efi_data(op).status; | |
74 | } | |
75 | ||
76 | static 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_dom0_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 | ||
99 | static 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_dom0_op(&op) < 0) | |
112 | return EFI_UNSUPPORTED; | |
113 | ||
114 | return efi_data(op).status; | |
115 | } | |
116 | ||
117 | static 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_dom0_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 | ||
142 | static 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_dom0_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 | ||
165 | static 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_dom0_op(&op) < 0) | |
182 | return EFI_UNSUPPORTED; | |
183 | ||
184 | return efi_data(op).status; | |
185 | } | |
186 | ||
187 | static 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_dom0_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 | ||
209 | static 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_dom0_op(&op) < 0) | |
214 | return EFI_UNSUPPORTED; | |
215 | ||
216 | *count = efi_data(op).misc; | |
217 | ||
218 | return efi_data(op).status; | |
219 | } | |
220 | ||
221 | static 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_dom0_op(&op) < 0) | |
236 | return EFI_UNSUPPORTED; | |
237 | ||
238 | return efi_data(op).status; | |
239 | } | |
240 | ||
241 | static 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_dom0_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 | ||
264 | static efi_char16_t vendor[100] __initdata; | |
265 | ||
266 | static 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 | ||
290 | static 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, | |
e1ccbbc9 | 297 | .smbios3 = EFI_INVALID_TABLE_ADDR, |
be81c8a1 DK |
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 | ||
323 | efi_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_dom0_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_dom0_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_dom0_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_dom0_op(&op) == 0) | |
368 | efi.runtime_version = info->version; | |
369 | ||
370 | return &efi_systab_xen; | |
371 | } |