[mirror_ubuntu-artful-kernel.git] / drivers / xen / efi.c

/*
 * 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/xen.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)

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;
}
EXPORT_SYMBOL_GPL(xen_efi_get_time);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_set_time);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_get_variable);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_get_next_variable);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_set_variable);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_query_variable_info);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_update_capsule);

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;
}
EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);
Commit	Line	Data
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>
342cd340 DK	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
a62ed500	41	efi_status_t xen_efi_get_time(efi_time_t tm, efi_time_cap_t tc)
be81c8a1 DK	42	{
	43	struct xen_platform_op op = INIT_EFI_OP(get_time);
	44
cfafae94	45	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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	}
a62ed500	62	EXPORT_SYMBOL_GPL(xen_efi_get_time);
be81c8a1	63
a62ed500	64	efi_status_t xen_efi_set_time(efi_time_t *tm)
be81c8a1 DK	65	{
	66	struct xen_platform_op op = INIT_EFI_OP(set_time);
	67
	68	BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
	69	memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
	70
cfafae94	71	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	72	return EFI_UNSUPPORTED;
	73
	74	return efi_data(op).status;
	75	}
a62ed500	76	EXPORT_SYMBOL_GPL(xen_efi_set_time);
be81c8a1	77
a62ed500 SZ	78	efi_status_t xen_efi_get_wakeup_time(efi_bool_t enabled, efi_bool_t pending,
a62ed500 SZ	79	efi_time_t *tm)
be81c8a1 DK	80	{
	81	struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
	82
cfafae94	83	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	84	return EFI_UNSUPPORTED;
	85
	86	if (tm) {
	87	BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
	88	memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
	89	}
	90
	91	if (enabled)
	92	*enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
	93
	94	if (pending)
	95	*pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
	96
	97	return efi_data(op).status;
	98	}
a62ed500	99	EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time);
be81c8a1	100
a62ed500	101	efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
be81c8a1 DK	102	{
	103	struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
	104
	105	BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
	106	if (enabled)
	107	efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
	108	if (tm)
	109	memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
	110	else
	111	efi_data(op).misc \|= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
	112
cfafae94	113	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	114	return EFI_UNSUPPORTED;
	115
	116	return efi_data(op).status;
	117	}
a62ed500	118	EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time);
be81c8a1	119
a62ed500 SZ	120	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)
be81c8a1 DK	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
cfafae94	133	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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	}
a62ed500	142	EXPORT_SYMBOL_GPL(xen_efi_get_variable);
be81c8a1	143
a62ed500 SZ	144	efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
	145	efi_char16_t *name,
	146	efi_guid_t *vendor)
be81c8a1 DK	147	{
	148	struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
	149
	150	efi_data(op).u.get_next_variable_name.size = *name_size;
	151	set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
	152	BUILD_BUG_ON(sizeof(*vendor) !=
	153	sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
	154	memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
	155	sizeof(*vendor));
	156
cfafae94	157	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	158	return EFI_UNSUPPORTED;
	159
	160	*name_size = efi_data(op).u.get_next_variable_name.size;
	161	memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
	162	sizeof(*vendor));
	163
	164	return efi_data(op).status;
	165	}
a62ed500	166	EXPORT_SYMBOL_GPL(xen_efi_get_next_variable);
be81c8a1	167
a62ed500 SZ	168	efi_status_t xen_efi_set_variable(efi_char16_t name, efi_guid_t vendor,
	169	u32 attr, unsigned long data_size,
	170	void *data)
be81c8a1 DK	171	{
	172	struct xen_platform_op op = INIT_EFI_OP(set_variable);
	173
	174	set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
	175	efi_data(op).misc = attr;
	176	BUILD_BUG_ON(sizeof(*vendor) !=
	177	sizeof(efi_data(op).u.set_variable.vendor_guid));
	178	memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
	179	efi_data(op).u.set_variable.size = data_size;
	180	set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
	181
cfafae94	182	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	183	return EFI_UNSUPPORTED;
	184
	185	return efi_data(op).status;
	186	}
a62ed500	187	EXPORT_SYMBOL_GPL(xen_efi_set_variable);
be81c8a1	188
a62ed500 SZ	189	efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
	190	u64 *remaining_space,
	191	u64 *max_variable_size)
be81c8a1 DK	192	{
	193	struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
	194
	195	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
	196	return EFI_UNSUPPORTED;
	197
	198	efi_data(op).u.query_variable_info.attr = attr;
	199
cfafae94	200	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	201	return EFI_UNSUPPORTED;
	202
	203	*storage_space = efi_data(op).u.query_variable_info.max_store_size;
	204	*remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
	205	*max_variable_size = efi_data(op).u.query_variable_info.max_size;
	206
	207	return efi_data(op).status;
	208	}
a62ed500	209	EXPORT_SYMBOL_GPL(xen_efi_query_variable_info);
be81c8a1	210
a62ed500	211	efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
be81c8a1 DK	212	{
	213	struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
	214
cfafae94	215	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	216	return EFI_UNSUPPORTED;
	217
	218	*count = efi_data(op).misc;
	219
	220	return efi_data(op).status;
	221	}
a62ed500	222	EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count);
be81c8a1	223
a62ed500 SZ	224	efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
a62ed500 SZ	225	unsigned long count, unsigned long sg_list)
be81c8a1 DK	226	{
	227	struct xen_platform_op op = INIT_EFI_OP(update_capsule);
	228
	229	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
	230	return EFI_UNSUPPORTED;
	231
	232	set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
	233	capsules);
	234	efi_data(op).u.update_capsule.capsule_count = count;
	235	efi_data(op).u.update_capsule.sg_list = sg_list;
	236
cfafae94	237	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	238	return EFI_UNSUPPORTED;
	239
	240	return efi_data(op).status;
	241	}
a62ed500	242	EXPORT_SYMBOL_GPL(xen_efi_update_capsule);
be81c8a1	243
a62ed500 SZ	244	efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
	245	unsigned long count, u64 *max_size,
	246	int *reset_type)
be81c8a1 DK	247	{
	248	struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
	249
	250	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
	251	return EFI_UNSUPPORTED;
	252
	253	set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
	254	capsules);
	255	efi_data(op).u.query_capsule_capabilities.capsule_count = count;
	256
cfafae94	257	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	258	return EFI_UNSUPPORTED;
	259
	260	*max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
	261	*reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
	262
	263	return efi_data(op).status;
	264	}
a62ed500	265	EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);