summaryrefslogtreecommitdiffstats
path: root/drivers/xen/efi.c
blob: fb321cd6415a40e8c4d0ad940611adcabe20ab97 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
// SPDX-License-Identifier: GPL-2.0-only
/*
 * EFI support for Xen.
 *
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 1999-2002 Hewlett-Packard Co.
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *	Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2005-2008 Intel Co.
 *	Fenghua Yu <fenghua.yu@intel.com>
 *	Bibo Mao <bibo.mao@intel.com>
 *	Chandramouli Narayanan <mouli@linux.intel.com>
 *	Huang Ying <ying.huang@intel.com>
 * Copyright (C) 2011 Novell Co.
 *	Jan Beulich <JBeulich@suse.com>
 * Copyright (C) 2011-2012 Oracle Co.
 *	Liang Tang <liang.tang@oracle.com>
 * Copyright (c) 2014 Oracle Co., Daniel Kiper
 */

#include <linux/bug.h>
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/string.h>

#include <xen/interface/xen.h>
#include <xen/interface/platform.h>
#include <xen/page.h>
#include <xen/xen.h>
#include <xen/xen-ops.h>

#include <asm/page.h>

#include <asm/xen/hypercall.h>

#define INIT_EFI_OP(name) \
	{.cmd = XENPF_efi_runtime_call, \
	 .u.efi_runtime_call.function = XEN_EFI_##name, \
	 .u.efi_runtime_call.misc = 0}

#define efi_data(op)	(op.u.efi_runtime_call)

static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
	struct xen_platform_op op = INIT_EFI_OP(get_time);

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	if (tm) {
		BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
		memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
	}

	if (tc) {
		tc->resolution = efi_data(op).u.get_time.resolution;
		tc->accuracy = efi_data(op).u.get_time.accuracy;
		tc->sets_to_zero = !!(efi_data(op).misc &
				      XEN_EFI_GET_TIME_SET_CLEARS_NS);
	}

	return efi_data(op).status;
}

static efi_status_t xen_efi_set_time(efi_time_t *tm)
{
	struct xen_platform_op op = INIT_EFI_OP(set_time);

	BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
	memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	return efi_data(op).status;
}

static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
					    efi_bool_t *pending,
					    efi_time_t *tm)
{
	struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	if (tm) {
		BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
		memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
	}

	if (enabled)
		*enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);

	if (pending)
		*pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);

	return efi_data(op).status;
}

static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
	struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);

	BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
	if (enabled)
		efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
	if (tm)
		memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
	else
		efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	return efi_data(op).status;
}

static efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
					 u32 *attr, unsigned long *data_size,
					 void *data)
{
	struct xen_platform_op op = INIT_EFI_OP(get_variable);

	set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
	BUILD_BUG_ON(sizeof(*vendor) !=
		     sizeof(efi_data(op).u.get_variable.vendor_guid));
	memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
	efi_data(op).u.get_variable.size = *data_size;
	set_xen_guest_handle(efi_data(op).u.get_variable.data, data);

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	*data_size = efi_data(op).u.get_variable.size;
	if (attr)
		*attr = efi_data(op).misc;

	return efi_data(op).status;
}

static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
					      efi_char16_t *name,
					      efi_guid_t *vendor)
{
	struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);

	efi_data(op).u.get_next_variable_name.size = *name_size;
	set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
	BUILD_BUG_ON(sizeof(*vendor) !=
		     sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
	memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
	       sizeof(*vendor));

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	*name_size = efi_data(op).u.get_next_variable_name.size;
	memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
	       sizeof(*vendor));

	return efi_data(op).status;
}

static efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
					 u32 attr, unsigned long data_size,
					 void *data)
{
	struct xen_platform_op op = INIT_EFI_OP(set_variable);

	set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
	efi_data(op).misc = attr;
	BUILD_BUG_ON(sizeof(*vendor) !=
		     sizeof(efi_data(op).u.set_variable.vendor_guid));
	memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
	efi_data(op).u.set_variable.size = data_size;
	set_xen_guest_handle(efi_data(op).u.set_variable.data, data);

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	return efi_data(op).status;
}

static efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
						u64 *remaining_space,
						u64 *max_variable_size)
{
	struct xen_platform_op op = INIT_EFI_OP(query_variable_info);

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	efi_data(op).u.query_variable_info.attr = attr;

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	*storage_space = efi_data(op).u.query_variable_info.max_store_size;
	*remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
	*max_variable_size = efi_data(op).u.query_variable_info.max_size;

	return efi_data(op).status;
}

static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
{
	struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	*count = efi_data(op).misc;

	return efi_data(op).status;
}

static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
				unsigned long count, unsigned long sg_list)
{
	struct xen_platform_op op = INIT_EFI_OP(update_capsule);

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
			     capsules);
	efi_data(op).u.update_capsule.capsule_count = count;
	efi_data(op).u.update_capsule.sg_list = sg_list;

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	return efi_data(op).status;
}

static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
			unsigned long count, u64 *max_size, int *reset_type)
{
	struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
					capsules);
	efi_data(op).u.query_capsule_capabilities.capsule_count = count;

	if (HYPERVISOR_platform_op(&op) < 0)
		return EFI_UNSUPPORTED;

	*max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
	*reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;

	return efi_data(op).status;
}

static void xen_efi_reset_system(int reset_type, efi_status_t status,
				 unsigned long data_size, efi_char16_t *data)
{
	switch (reset_type) {
	case EFI_RESET_COLD:
	case EFI_RESET_WARM:
		xen_reboot(SHUTDOWN_reboot);
		break;
	case EFI_RESET_SHUTDOWN:
		xen_reboot(SHUTDOWN_poweroff);
		break;
	default:
		BUG();
	}
}

/*
 * Set XEN EFI runtime services function pointers. Other fields of struct efi,
 * e.g. efi.systab, will be set like normal EFI.
 */
void __init xen_efi_runtime_setup(void)
{
	efi.get_time			= xen_efi_get_time;
	efi.set_time			= xen_efi_set_time;
	efi.get_wakeup_time		= xen_efi_get_wakeup_time;
	efi.set_wakeup_time		= xen_efi_set_wakeup_time;
	efi.get_variable		= xen_efi_get_variable;
	efi.get_next_variable		= xen_efi_get_next_variable;
	efi.set_variable		= xen_efi_set_variable;
	efi.set_variable_nonblocking	= xen_efi_set_variable;
	efi.query_variable_info		= xen_efi_query_variable_info;
	efi.query_variable_info_nonblocking = xen_efi_query_variable_info;
	efi.update_capsule		= xen_efi_update_capsule;
	efi.query_capsule_caps		= xen_efi_query_capsule_caps;
	efi.get_next_high_mono_count	= xen_efi_get_next_high_mono_count;
	efi.reset_system		= xen_efi_reset_system;
}

int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
{
	static_assert(XEN_PAGE_SHIFT == EFI_PAGE_SHIFT,
	              "Mismatch between EFI_PAGE_SHIFT and XEN_PAGE_SHIFT");
	struct xen_platform_op op;
	union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
	int rc;

	if (!efi_enabled(EFI_PARAVIRT) || efi_enabled(EFI_MEMMAP))
		return __efi_mem_desc_lookup(phys_addr, out_md);
	phys_addr &= ~(u64)(EFI_PAGE_SIZE - 1);
	op = (struct xen_platform_op) {
		.cmd = XENPF_firmware_info,
		.u.firmware_info = {
			.type = XEN_FW_EFI_INFO,
			.index = XEN_FW_EFI_MEM_INFO,
			.u.efi_info.mem.addr = phys_addr,
			.u.efi_info.mem.size = U64_MAX - phys_addr,
		},
	};

	rc = HYPERVISOR_platform_op(&op);
	if (rc) {
		pr_warn("Failed to lookup header 0x%llx in Xen memory map: error %d\n",
		        phys_addr, rc);
	}

	out_md->phys_addr	= info->mem.addr;
	out_md->num_pages	= info->mem.size >> EFI_PAGE_SHIFT;
	out_md->type    	= info->mem.type;
	out_md->attribute	= info->mem.attr;

	return 0;
}

bool __init xen_efi_config_table_is_usable(const efi_guid_t *guid,
                                           unsigned long table)
{
	efi_memory_desc_t md;
	int rc;

	if (!efi_enabled(EFI_PARAVIRT))
		return true;

	rc = efi_mem_desc_lookup(table, &md);
	if (rc)
		return false;

	switch (md.type) {
	case EFI_RUNTIME_SERVICES_CODE:
	case EFI_RUNTIME_SERVICES_DATA:
	case EFI_ACPI_RECLAIM_MEMORY:
	case EFI_ACPI_MEMORY_NVS:
	case EFI_RESERVED_TYPE:
		return true;
	default:
		return false;
	}
}