285 lines
8.1 KiB
C
285 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* EFI support for Xen.
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*
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
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* Copyright (C) 1999-2002 Hewlett-Packard Co.
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Stephane Eranian <eranian@hpl.hp.com>
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* Copyright (C) 2005-2008 Intel Co.
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* Fenghua Yu <fenghua.yu@intel.com>
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* Bibo Mao <bibo.mao@intel.com>
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* Chandramouli Narayanan <mouli@linux.intel.com>
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* Huang Ying <ying.huang@intel.com>
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* Copyright (C) 2011 Novell Co.
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* Jan Beulich <JBeulich@suse.com>
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* Copyright (C) 2011-2012 Oracle Co.
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* Liang Tang <liang.tang@oracle.com>
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* Copyright (c) 2014 Oracle Co., Daniel Kiper
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*/
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#include <linux/bug.h>
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#include <linux/efi.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/platform.h>
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#include <xen/xen.h>
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#include <xen/xen-ops.h>
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#include <asm/page.h>
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#include <asm/xen/hypercall.h>
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#define INIT_EFI_OP(name) \
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{.cmd = XENPF_efi_runtime_call, \
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.u.efi_runtime_call.function = XEN_EFI_##name, \
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.u.efi_runtime_call.misc = 0}
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#define efi_data(op) (op.u.efi_runtime_call)
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efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
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{
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struct xen_platform_op op = INIT_EFI_OP(get_time);
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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if (tm) {
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BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
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memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
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}
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if (tc) {
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tc->resolution = efi_data(op).u.get_time.resolution;
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tc->accuracy = efi_data(op).u.get_time.accuracy;
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tc->sets_to_zero = !!(efi_data(op).misc &
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XEN_EFI_GET_TIME_SET_CLEARS_NS);
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}
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_get_time);
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efi_status_t xen_efi_set_time(efi_time_t *tm)
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{
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struct xen_platform_op op = INIT_EFI_OP(set_time);
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BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
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memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_set_time);
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efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
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efi_time_t *tm)
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{
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struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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if (tm) {
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BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
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memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
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}
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if (enabled)
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*enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
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if (pending)
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*pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time);
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efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
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{
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struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
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BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
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if (enabled)
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efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
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if (tm)
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memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
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else
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efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time);
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efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
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u32 *attr, unsigned long *data_size,
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void *data)
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{
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struct xen_platform_op op = INIT_EFI_OP(get_variable);
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set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
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BUILD_BUG_ON(sizeof(*vendor) !=
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sizeof(efi_data(op).u.get_variable.vendor_guid));
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memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
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efi_data(op).u.get_variable.size = *data_size;
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set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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*data_size = efi_data(op).u.get_variable.size;
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if (attr)
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*attr = efi_data(op).misc;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_get_variable);
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efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
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efi_char16_t *name,
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efi_guid_t *vendor)
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{
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struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
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efi_data(op).u.get_next_variable_name.size = *name_size;
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set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
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BUILD_BUG_ON(sizeof(*vendor) !=
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sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
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memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
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sizeof(*vendor));
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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*name_size = efi_data(op).u.get_next_variable_name.size;
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memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
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sizeof(*vendor));
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_get_next_variable);
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efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
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u32 attr, unsigned long data_size,
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void *data)
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{
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struct xen_platform_op op = INIT_EFI_OP(set_variable);
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set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
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efi_data(op).misc = attr;
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BUILD_BUG_ON(sizeof(*vendor) !=
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sizeof(efi_data(op).u.set_variable.vendor_guid));
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memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
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efi_data(op).u.set_variable.size = data_size;
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set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_set_variable);
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efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
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u64 *remaining_space,
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u64 *max_variable_size)
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{
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struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
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if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
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return EFI_UNSUPPORTED;
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efi_data(op).u.query_variable_info.attr = attr;
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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*storage_space = efi_data(op).u.query_variable_info.max_store_size;
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*remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
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*max_variable_size = efi_data(op).u.query_variable_info.max_size;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_query_variable_info);
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efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
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{
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struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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*count = efi_data(op).misc;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count);
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efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
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unsigned long count, unsigned long sg_list)
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{
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struct xen_platform_op op = INIT_EFI_OP(update_capsule);
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if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
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return EFI_UNSUPPORTED;
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set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
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capsules);
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efi_data(op).u.update_capsule.capsule_count = count;
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efi_data(op).u.update_capsule.sg_list = sg_list;
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_update_capsule);
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efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
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unsigned long count, u64 *max_size,
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int *reset_type)
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{
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struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
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if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
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return EFI_UNSUPPORTED;
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set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
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capsules);
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efi_data(op).u.query_capsule_capabilities.capsule_count = count;
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if (HYPERVISOR_platform_op(&op) < 0)
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return EFI_UNSUPPORTED;
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*max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
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*reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
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return efi_data(op).status;
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}
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EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);
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void xen_efi_reset_system(int reset_type, efi_status_t status,
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unsigned long data_size, efi_char16_t *data)
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{
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switch (reset_type) {
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case EFI_RESET_COLD:
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case EFI_RESET_WARM:
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xen_reboot(SHUTDOWN_reboot);
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break;
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case EFI_RESET_SHUTDOWN:
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xen_reboot(SHUTDOWN_poweroff);
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break;
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL_GPL(xen_efi_reset_system);
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