[linux-2.6-block.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)

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 efi_char16_t vendor[100] __initdata;

static efi_system_table_t efi_systab_xen __initdata = {
	.hdr = {
		.signature	= EFI_SYSTEM_TABLE_SIGNATURE,
		.revision	= 0, /* Initialized later. */
		.headersize	= 0, /* Ignored by Linux Kernel. */
		.crc32		= 0, /* Ignored by Linux Kernel. */
		.reserved	= 0
	},
	.fw_vendor	= EFI_INVALID_TABLE_ADDR, /* Initialized later. */
	.fw_revision	= 0,			  /* Initialized later. */
	.con_in_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
	.con_in		= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
	.con_out_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
	.con_out	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
	.stderr_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
	.stderr		= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
	.runtime	= (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
						  /* Not used under Xen. */
	.boottime	= (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
						  /* Not used under Xen. */
	.nr_tables	= 0,			  /* Initialized later. */
	.tables		= EFI_INVALID_TABLE_ADDR  /* Initialized later. */
};

static const struct efi efi_xen __initconst = {
	.systab                   = NULL, /* Initialized later. */
	.runtime_version	  = 0,    /* Initialized later. */
	.mps                      = EFI_INVALID_TABLE_ADDR,
	.acpi                     = EFI_INVALID_TABLE_ADDR,
	.acpi20                   = EFI_INVALID_TABLE_ADDR,
	.smbios                   = EFI_INVALID_TABLE_ADDR,
	.smbios3                  = EFI_INVALID_TABLE_ADDR,
	.sal_systab               = EFI_INVALID_TABLE_ADDR,
	.boot_info                = EFI_INVALID_TABLE_ADDR,
	.hcdp                     = EFI_INVALID_TABLE_ADDR,
	.uga                      = EFI_INVALID_TABLE_ADDR,
	.uv_systab                = EFI_INVALID_TABLE_ADDR,
	.fw_vendor                = EFI_INVALID_TABLE_ADDR,
	.runtime                  = EFI_INVALID_TABLE_ADDR,
	.config_table             = EFI_INVALID_TABLE_ADDR,
	.get_time                 = xen_efi_get_time,
	.set_time                 = xen_efi_set_time,
	.get_wakeup_time          = xen_efi_get_wakeup_time,
	.set_wakeup_time          = xen_efi_set_wakeup_time,
	.get_variable             = xen_efi_get_variable,
	.get_next_variable        = xen_efi_get_next_variable,
	.set_variable             = xen_efi_set_variable,
	.query_variable_info      = xen_efi_query_variable_info,
	.update_capsule           = xen_efi_update_capsule,
	.query_capsule_caps       = xen_efi_query_capsule_caps,
	.get_next_high_mono_count = xen_efi_get_next_high_mono_count,
	.reset_system             = NULL, /* Functionality provided by Xen. */
	.set_virtual_address_map  = NULL, /* Not used under Xen. */
	.memmap                   = NULL, /* Not used under Xen. */
	.flags			  = 0     /* Initialized later. */
};

efi_system_table_t __init *xen_efi_probe(void)
{
	struct xen_platform_op op = {
		.cmd = XENPF_firmware_info,
		.u.firmware_info = {
			.type = XEN_FW_EFI_INFO,
			.index = XEN_FW_EFI_CONFIG_TABLE
		}
	};
	union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;

	if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0)
		return NULL;

	/* Here we know that Xen runs on EFI platform. */

	efi = efi_xen;

	efi_systab_xen.tables = info->cfg.addr;
	efi_systab_xen.nr_tables = info->cfg.nent;

	op.cmd = XENPF_firmware_info;
	op.u.firmware_info.type = XEN_FW_EFI_INFO;
	op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
	info->vendor.bufsz = sizeof(vendor);
	set_xen_guest_handle(info->vendor.name, vendor);

	if (HYPERVISOR_platform_op(&op) == 0) {
		efi_systab_xen.fw_vendor = __pa_symbol(vendor);
		efi_systab_xen.fw_revision = info->vendor.revision;
	} else
		efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");

	op.cmd = XENPF_firmware_info;
	op.u.firmware_info.type = XEN_FW_EFI_INFO;
	op.u.firmware_info.index = XEN_FW_EFI_VERSION;

	if (HYPERVISOR_platform_op(&op) == 0)
		efi_systab_xen.hdr.revision = info->version;

	op.cmd = XENPF_firmware_info;
	op.u.firmware_info.type = XEN_FW_EFI_INFO;
	op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;

	if (HYPERVISOR_platform_op(&op) == 0)
		efi.runtime_version = info->version;

	return &efi_systab_xen;
}
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
	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
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	}
	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
cfafae94	70	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	82	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	111	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	132	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	155	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	181	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	199	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	213	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	235	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	255	if (HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	334	if (!xen_initial_domain() \|\| HYPERVISOR_platform_op(&op) < 0)
be81c8a1 DK	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
cfafae94	350	if (HYPERVISOR_platform_op(&op) == 0) {
be81c8a1 DK	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
cfafae94	360	if (HYPERVISOR_platform_op(&op) == 0)
be81c8a1 DK	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
cfafae94	367	if (HYPERVISOR_platform_op(&op) == 0)
be81c8a1 DK	368	efi.runtime_version = info->version;
	369
	370	return &efi_systab_xen;
	371	}