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/page.h> |
30 | #include <xen/xen.h> |
31 | #include <xen/xen-ops.h> |
32 | |
33 | #include <asm/page.h> |
34 | |
35 | #include <asm/xen/hypercall.h> |
36 | |
37 | #define INIT_EFI_OP(name) \ |
38 | {.cmd = XENPF_efi_runtime_call, \ |
39 | .u.efi_runtime_call.function = XEN_EFI_##name, \ |
40 | .u.efi_runtime_call.misc = 0} |
41 | |
42 | #define efi_data(op) (op.u.efi_runtime_call) |
43 | |
44 | static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
45 | { |
46 | struct xen_platform_op op = INIT_EFI_OP(get_time); |
47 | |
48 | if (HYPERVISOR_platform_op(op: &op) < 0) |
49 | return EFI_UNSUPPORTED; |
50 | |
51 | if (tm) { |
52 | BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time)); |
53 | memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm)); |
54 | } |
55 | |
56 | if (tc) { |
57 | tc->resolution = efi_data(op).u.get_time.resolution; |
58 | tc->accuracy = efi_data(op).u.get_time.accuracy; |
59 | tc->sets_to_zero = !!(efi_data(op).misc & |
60 | XEN_EFI_GET_TIME_SET_CLEARS_NS); |
61 | } |
62 | |
63 | return efi_data(op).status; |
64 | } |
65 | |
66 | static efi_status_t xen_efi_set_time(efi_time_t *tm) |
67 | { |
68 | struct xen_platform_op op = INIT_EFI_OP(set_time); |
69 | |
70 | BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time)); |
71 | memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm)); |
72 | |
73 | if (HYPERVISOR_platform_op(op: &op) < 0) |
74 | return EFI_UNSUPPORTED; |
75 | |
76 | return efi_data(op).status; |
77 | } |
78 | |
79 | static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, |
80 | efi_bool_t *pending, |
81 | efi_time_t *tm) |
82 | { |
83 | struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time); |
84 | |
85 | if (HYPERVISOR_platform_op(op: &op) < 0) |
86 | return EFI_UNSUPPORTED; |
87 | |
88 | if (tm) { |
89 | BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time)); |
90 | memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm)); |
91 | } |
92 | |
93 | if (enabled) |
94 | *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED); |
95 | |
96 | if (pending) |
97 | *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING); |
98 | |
99 | return efi_data(op).status; |
100 | } |
101 | |
102 | static 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: &op) < 0) |
115 | return EFI_UNSUPPORTED; |
116 | |
117 | return efi_data(op).status; |
118 | } |
119 | |
120 | static efi_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: &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 | } |
142 | |
143 | static efi_status_t xen_efi_get_next_variable(unsigned long *name_size, |
144 | efi_char16_t *name, |
145 | efi_guid_t *vendor) |
146 | { |
147 | struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name); |
148 | |
149 | efi_data(op).u.get_next_variable_name.size = *name_size; |
150 | set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name); |
151 | BUILD_BUG_ON(sizeof(*vendor) != |
152 | sizeof(efi_data(op).u.get_next_variable_name.vendor_guid)); |
153 | memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor, |
154 | sizeof(*vendor)); |
155 | |
156 | if (HYPERVISOR_platform_op(op: &op) < 0) |
157 | return EFI_UNSUPPORTED; |
158 | |
159 | *name_size = efi_data(op).u.get_next_variable_name.size; |
160 | memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid, |
161 | sizeof(*vendor)); |
162 | |
163 | return efi_data(op).status; |
164 | } |
165 | |
166 | static efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor, |
167 | u32 attr, unsigned long data_size, |
168 | void *data) |
169 | { |
170 | struct xen_platform_op op = INIT_EFI_OP(set_variable); |
171 | |
172 | set_xen_guest_handle(efi_data(op).u.set_variable.name, name); |
173 | efi_data(op).misc = attr; |
174 | BUILD_BUG_ON(sizeof(*vendor) != |
175 | sizeof(efi_data(op).u.set_variable.vendor_guid)); |
176 | memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor)); |
177 | efi_data(op).u.set_variable.size = data_size; |
178 | set_xen_guest_handle(efi_data(op).u.set_variable.data, data); |
179 | |
180 | if (HYPERVISOR_platform_op(op: &op) < 0) |
181 | return EFI_UNSUPPORTED; |
182 | |
183 | return efi_data(op).status; |
184 | } |
185 | |
186 | static efi_status_t xen_efi_query_variable_info(u32 attr, 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_platform_op(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_platform_op(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, unsigned long sg_list) |
221 | { |
222 | struct xen_platform_op op = INIT_EFI_OP(update_capsule); |
223 | |
224 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) |
225 | return EFI_UNSUPPORTED; |
226 | |
227 | set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array, |
228 | capsules); |
229 | efi_data(op).u.update_capsule.capsule_count = count; |
230 | efi_data(op).u.update_capsule.sg_list = sg_list; |
231 | |
232 | if (HYPERVISOR_platform_op(op: &op) < 0) |
233 | return EFI_UNSUPPORTED; |
234 | |
235 | return efi_data(op).status; |
236 | } |
237 | |
238 | static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules, |
239 | unsigned long count, u64 *max_size, int *reset_type) |
240 | { |
241 | struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities); |
242 | |
243 | if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) |
244 | return EFI_UNSUPPORTED; |
245 | |
246 | set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array, |
247 | capsules); |
248 | efi_data(op).u.query_capsule_capabilities.capsule_count = count; |
249 | |
250 | if (HYPERVISOR_platform_op(op: &op) < 0) |
251 | return EFI_UNSUPPORTED; |
252 | |
253 | *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size; |
254 | *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type; |
255 | |
256 | return efi_data(op).status; |
257 | } |
258 | |
259 | static void xen_efi_reset_system(int reset_type, efi_status_t status, |
260 | unsigned long data_size, efi_char16_t *data) |
261 | { |
262 | switch (reset_type) { |
263 | case EFI_RESET_COLD: |
264 | case EFI_RESET_WARM: |
265 | xen_reboot(SHUTDOWN_reboot); |
266 | break; |
267 | case EFI_RESET_SHUTDOWN: |
268 | xen_reboot(SHUTDOWN_poweroff); |
269 | break; |
270 | default: |
271 | BUG(); |
272 | } |
273 | } |
274 | |
275 | /* |
276 | * Set XEN EFI runtime services function pointers. Other fields of struct efi, |
277 | * e.g. efi.systab, will be set like normal EFI. |
278 | */ |
279 | void __init xen_efi_runtime_setup(void) |
280 | { |
281 | efi.get_time = xen_efi_get_time; |
282 | efi.set_time = xen_efi_set_time; |
283 | efi.get_wakeup_time = xen_efi_get_wakeup_time; |
284 | efi.set_wakeup_time = xen_efi_set_wakeup_time; |
285 | efi.get_variable = xen_efi_get_variable; |
286 | efi.get_next_variable = xen_efi_get_next_variable; |
287 | efi.set_variable = xen_efi_set_variable; |
288 | efi.set_variable_nonblocking = xen_efi_set_variable; |
289 | efi.query_variable_info = xen_efi_query_variable_info; |
290 | efi.query_variable_info_nonblocking = xen_efi_query_variable_info; |
291 | efi.update_capsule = xen_efi_update_capsule; |
292 | efi.query_capsule_caps = xen_efi_query_capsule_caps; |
293 | efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count; |
294 | efi.reset_system = xen_efi_reset_system; |
295 | } |
296 | |
297 | int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md) |
298 | { |
299 | static_assert(XEN_PAGE_SHIFT == EFI_PAGE_SHIFT, |
300 | "Mismatch between EFI_PAGE_SHIFT and XEN_PAGE_SHIFT" ); |
301 | struct xen_platform_op op; |
302 | union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info; |
303 | int rc; |
304 | |
305 | if (!efi_enabled(EFI_PARAVIRT) || efi_enabled(EFI_MEMMAP)) |
306 | return __efi_mem_desc_lookup(phys_addr, out_md); |
307 | phys_addr &= ~(u64)(EFI_PAGE_SIZE - 1); |
308 | op = (struct xen_platform_op) { |
309 | .cmd = XENPF_firmware_info, |
310 | .u.firmware_info = { |
311 | .type = XEN_FW_EFI_INFO, |
312 | .index = XEN_FW_EFI_MEM_INFO, |
313 | .u.efi_info.mem.addr = phys_addr, |
314 | .u.efi_info.mem.size = U64_MAX - phys_addr, |
315 | }, |
316 | }; |
317 | |
318 | rc = HYPERVISOR_platform_op(op: &op); |
319 | if (rc) { |
320 | pr_warn("Failed to lookup header 0x%llx in Xen memory map: error %d\n" , |
321 | phys_addr, rc); |
322 | } |
323 | |
324 | out_md->phys_addr = info->mem.addr; |
325 | out_md->num_pages = info->mem.size >> EFI_PAGE_SHIFT; |
326 | out_md->type = info->mem.type; |
327 | out_md->attribute = info->mem.attr; |
328 | |
329 | return 0; |
330 | } |
331 | |
332 | bool __init xen_efi_config_table_is_usable(const efi_guid_t *guid, |
333 | unsigned long table) |
334 | { |
335 | efi_memory_desc_t md; |
336 | int rc; |
337 | |
338 | if (!efi_enabled(EFI_PARAVIRT)) |
339 | return true; |
340 | |
341 | rc = efi_mem_desc_lookup(phys_addr: table, out_md: &md); |
342 | if (rc) |
343 | return false; |
344 | |
345 | switch (md.type) { |
346 | case EFI_RUNTIME_SERVICES_CODE: |
347 | case EFI_RUNTIME_SERVICES_DATA: |
348 | case EFI_ACPI_RECLAIM_MEMORY: |
349 | case EFI_ACPI_MEMORY_NVS: |
350 | case EFI_RESERVED_TYPE: |
351 | return true; |
352 | default: |
353 | return false; |
354 | } |
355 | } |
356 | |