text: // 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/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;
  }
  