356 lines
10 KiB
C
356 lines
10 KiB
C
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// 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/page.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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static 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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static 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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static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
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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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static 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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static 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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static 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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static 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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static 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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static 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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static 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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static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
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unsigned long count, u64 *max_size, 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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static 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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/*
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* Set XEN EFI runtime services function pointers. Other fields of struct efi,
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* e.g. efi.systab, will be set like normal EFI.
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*/
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void __init xen_efi_runtime_setup(void)
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{
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efi.get_time = xen_efi_get_time;
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efi.set_time = xen_efi_set_time;
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efi.get_wakeup_time = xen_efi_get_wakeup_time;
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efi.set_wakeup_time = xen_efi_set_wakeup_time;
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efi.get_variable = xen_efi_get_variable;
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efi.get_next_variable = xen_efi_get_next_variable;
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efi.set_variable = xen_efi_set_variable;
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efi.set_variable_nonblocking = xen_efi_set_variable;
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efi.query_variable_info = xen_efi_query_variable_info;
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efi.query_variable_info_nonblocking = xen_efi_query_variable_info;
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efi.update_capsule = xen_efi_update_capsule;
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efi.query_capsule_caps = xen_efi_query_capsule_caps;
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efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
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efi.reset_system = xen_efi_reset_system;
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}
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int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
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{
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static_assert(XEN_PAGE_SHIFT == EFI_PAGE_SHIFT,
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"Mismatch between EFI_PAGE_SHIFT and XEN_PAGE_SHIFT");
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struct xen_platform_op op;
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union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
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int rc;
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if (!efi_enabled(EFI_PARAVIRT) || efi_enabled(EFI_MEMMAP))
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return __efi_mem_desc_lookup(phys_addr, out_md);
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phys_addr &= ~(u64)(EFI_PAGE_SIZE - 1);
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op = (struct xen_platform_op) {
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.cmd = XENPF_firmware_info,
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.u.firmware_info = {
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.type = XEN_FW_EFI_INFO,
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.index = XEN_FW_EFI_MEM_INFO,
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.u.efi_info.mem.addr = phys_addr,
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.u.efi_info.mem.size = U64_MAX - phys_addr,
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},
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};
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rc = HYPERVISOR_platform_op(&op);
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if (rc) {
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pr_warn("Failed to lookup header 0x%llx in Xen memory map: error %d\n",
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phys_addr, rc);
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}
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out_md->phys_addr = info->mem.addr;
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out_md->num_pages = info->mem.size >> EFI_PAGE_SHIFT;
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out_md->type = info->mem.type;
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out_md->attribute = info->mem.attr;
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return 0;
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}
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||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}
|