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478 lines
14 KiB
478 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* runtime-wrappers.c - Runtime Services function call wrappers |
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* |
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* Implementation summary: |
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* ----------------------- |
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* 1. When user/kernel thread requests to execute efi_runtime_service(), |
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* enqueue work to efi_rts_wq. |
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* 2. Caller thread waits for completion until the work is finished |
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* because it's dependent on the return status and execution of |
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* efi_runtime_service(). |
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* For instance, get_variable() and get_next_variable(). |
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* |
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* Copyright (C) 2014 Linaro Ltd. <[email protected]> |
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* |
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* Split off from arch/x86/platform/efi/efi.c |
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* |
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* Copyright (C) 1999 VA Linux Systems |
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* Copyright (C) 1999 Walt Drummond <[email protected]> |
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* Copyright (C) 1999-2002 Hewlett-Packard Co. |
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* Copyright (C) 2005-2008 Intel Co. |
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* Copyright (C) 2013 SuSE Labs |
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*/ |
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#define pr_fmt(fmt) "efi: " fmt |
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#include <linux/bug.h> |
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#include <linux/efi.h> |
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#include <linux/irqflags.h> |
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#include <linux/mutex.h> |
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#include <linux/semaphore.h> |
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#include <linux/stringify.h> |
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#include <linux/workqueue.h> |
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#include <linux/completion.h> |
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#include <asm/efi.h> |
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/* |
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* Wrap around the new efi_call_virt_generic() macros so that the |
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* code doesn't get too cluttered: |
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*/ |
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#define efi_call_virt(f, args...) \ |
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efi_call_virt_pointer(efi.runtime, f, args) |
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#define __efi_call_virt(f, args...) \ |
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__efi_call_virt_pointer(efi.runtime, f, args) |
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struct efi_runtime_work efi_rts_work; |
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/* |
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* efi_queue_work: Queue efi_runtime_service() and wait until it's done |
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* @rts: efi_runtime_service() function identifier |
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* @rts_arg<1-5>: efi_runtime_service() function arguments |
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* |
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* Accesses to efi_runtime_services() are serialized by a binary |
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* semaphore (efi_runtime_lock) and caller waits until the work is |
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* finished, hence _only_ one work is queued at a time and the caller |
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* thread waits for completion. |
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*/ |
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#define efi_queue_work(_rts, _arg1, _arg2, _arg3, _arg4, _arg5) \ |
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({ \ |
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efi_rts_work.status = EFI_ABORTED; \ |
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\ |
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if (!efi_enabled(EFI_RUNTIME_SERVICES)) { \ |
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pr_warn_once("EFI Runtime Services are disabled!\n"); \ |
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goto exit; \ |
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} \ |
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\ |
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init_completion(&efi_rts_work.efi_rts_comp); \ |
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INIT_WORK(&efi_rts_work.work, efi_call_rts); \ |
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efi_rts_work.arg1 = _arg1; \ |
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efi_rts_work.arg2 = _arg2; \ |
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efi_rts_work.arg3 = _arg3; \ |
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efi_rts_work.arg4 = _arg4; \ |
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efi_rts_work.arg5 = _arg5; \ |
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efi_rts_work.efi_rts_id = _rts; \ |
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\ |
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/* \ |
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* queue_work() returns 0 if work was already on queue, \ |
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* _ideally_ this should never happen. \ |
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*/ \ |
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if (queue_work(efi_rts_wq, &efi_rts_work.work)) \ |
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wait_for_completion(&efi_rts_work.efi_rts_comp); \ |
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else \ |
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pr_err("Failed to queue work to efi_rts_wq.\n"); \ |
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\ |
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exit: \ |
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efi_rts_work.efi_rts_id = EFI_NONE; \ |
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efi_rts_work.status; \ |
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}) |
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#ifndef arch_efi_save_flags |
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#define arch_efi_save_flags(state_flags) local_save_flags(state_flags) |
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#define arch_efi_restore_flags(state_flags) local_irq_restore(state_flags) |
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#endif |
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unsigned long efi_call_virt_save_flags(void) |
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{ |
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unsigned long flags; |
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arch_efi_save_flags(flags); |
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return flags; |
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} |
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void efi_call_virt_check_flags(unsigned long flags, const char *call) |
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{ |
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unsigned long cur_flags, mismatch; |
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cur_flags = efi_call_virt_save_flags(); |
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mismatch = flags ^ cur_flags; |
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if (!WARN_ON_ONCE(mismatch & ARCH_EFI_IRQ_FLAGS_MASK)) |
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return; |
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add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_NOW_UNRELIABLE); |
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pr_err_ratelimited(FW_BUG "IRQ flags corrupted (0x%08lx=>0x%08lx) by EFI %s\n", |
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flags, cur_flags, call); |
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arch_efi_restore_flags(flags); |
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} |
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/* |
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* According to section 7.1 of the UEFI spec, Runtime Services are not fully |
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* reentrant, and there are particular combinations of calls that need to be |
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* serialized. (source: UEFI Specification v2.4A) |
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* |
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* Table 31. Rules for Reentry Into Runtime Services |
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* +------------------------------------+-------------------------------+ |
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* | If previous call is busy in | Forbidden to call | |
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* +------------------------------------+-------------------------------+ |
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* | Any | SetVirtualAddressMap() | |
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* +------------------------------------+-------------------------------+ |
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* | ConvertPointer() | ConvertPointer() | |
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* +------------------------------------+-------------------------------+ |
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* | SetVariable() | ResetSystem() | |
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* | UpdateCapsule() | | |
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* | SetTime() | | |
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* | SetWakeupTime() | | |
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* | GetNextHighMonotonicCount() | | |
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* +------------------------------------+-------------------------------+ |
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* | GetVariable() | GetVariable() | |
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* | GetNextVariableName() | GetNextVariableName() | |
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* | SetVariable() | SetVariable() | |
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* | QueryVariableInfo() | QueryVariableInfo() | |
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* | UpdateCapsule() | UpdateCapsule() | |
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* | QueryCapsuleCapabilities() | QueryCapsuleCapabilities() | |
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* | GetNextHighMonotonicCount() | GetNextHighMonotonicCount() | |
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* +------------------------------------+-------------------------------+ |
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* | GetTime() | GetTime() | |
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* | SetTime() | SetTime() | |
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* | GetWakeupTime() | GetWakeupTime() | |
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* | SetWakeupTime() | SetWakeupTime() | |
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* +------------------------------------+-------------------------------+ |
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* |
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* Due to the fact that the EFI pstore may write to the variable store in |
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* interrupt context, we need to use a lock for at least the groups that |
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* contain SetVariable() and QueryVariableInfo(). That leaves little else, as |
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* none of the remaining functions are actually ever called at runtime. |
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* So let's just use a single lock to serialize all Runtime Services calls. |
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*/ |
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static DEFINE_SEMAPHORE(efi_runtime_lock); |
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/* |
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* Expose the EFI runtime lock to the UV platform |
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*/ |
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#ifdef CONFIG_X86_UV |
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extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock); |
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#endif |
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/* |
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* Calls the appropriate efi_runtime_service() with the appropriate |
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* arguments. |
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* |
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* Semantics followed by efi_call_rts() to understand efi_runtime_work: |
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* 1. If argument was a pointer, recast it from void pointer to original |
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* pointer type. |
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* 2. If argument was a value, recast it from void pointer to original |
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* pointer type and dereference it. |
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*/ |
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static void efi_call_rts(struct work_struct *work) |
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{ |
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void *arg1, *arg2, *arg3, *arg4, *arg5; |
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efi_status_t status = EFI_NOT_FOUND; |
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arg1 = efi_rts_work.arg1; |
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arg2 = efi_rts_work.arg2; |
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arg3 = efi_rts_work.arg3; |
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arg4 = efi_rts_work.arg4; |
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arg5 = efi_rts_work.arg5; |
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switch (efi_rts_work.efi_rts_id) { |
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case EFI_GET_TIME: |
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status = efi_call_virt(get_time, (efi_time_t *)arg1, |
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(efi_time_cap_t *)arg2); |
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break; |
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case EFI_SET_TIME: |
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status = efi_call_virt(set_time, (efi_time_t *)arg1); |
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break; |
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case EFI_GET_WAKEUP_TIME: |
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status = efi_call_virt(get_wakeup_time, (efi_bool_t *)arg1, |
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(efi_bool_t *)arg2, (efi_time_t *)arg3); |
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break; |
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case EFI_SET_WAKEUP_TIME: |
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status = efi_call_virt(set_wakeup_time, *(efi_bool_t *)arg1, |
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(efi_time_t *)arg2); |
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break; |
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case EFI_GET_VARIABLE: |
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status = efi_call_virt(get_variable, (efi_char16_t *)arg1, |
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(efi_guid_t *)arg2, (u32 *)arg3, |
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(unsigned long *)arg4, (void *)arg5); |
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break; |
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case EFI_GET_NEXT_VARIABLE: |
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status = efi_call_virt(get_next_variable, (unsigned long *)arg1, |
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(efi_char16_t *)arg2, |
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(efi_guid_t *)arg3); |
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break; |
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case EFI_SET_VARIABLE: |
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status = efi_call_virt(set_variable, (efi_char16_t *)arg1, |
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(efi_guid_t *)arg2, *(u32 *)arg3, |
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*(unsigned long *)arg4, (void *)arg5); |
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break; |
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case EFI_QUERY_VARIABLE_INFO: |
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status = efi_call_virt(query_variable_info, *(u32 *)arg1, |
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(u64 *)arg2, (u64 *)arg3, (u64 *)arg4); |
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break; |
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case EFI_GET_NEXT_HIGH_MONO_COUNT: |
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status = efi_call_virt(get_next_high_mono_count, (u32 *)arg1); |
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break; |
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case EFI_UPDATE_CAPSULE: |
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status = efi_call_virt(update_capsule, |
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(efi_capsule_header_t **)arg1, |
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*(unsigned long *)arg2, |
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*(unsigned long *)arg3); |
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break; |
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case EFI_QUERY_CAPSULE_CAPS: |
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status = efi_call_virt(query_capsule_caps, |
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(efi_capsule_header_t **)arg1, |
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*(unsigned long *)arg2, (u64 *)arg3, |
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(int *)arg4); |
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break; |
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default: |
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/* |
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* Ideally, we should never reach here because a caller of this |
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* function should have put the right efi_runtime_service() |
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* function identifier into efi_rts_work->efi_rts_id |
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*/ |
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pr_err("Requested executing invalid EFI Runtime Service.\n"); |
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} |
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efi_rts_work.status = status; |
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complete(&efi_rts_work.efi_rts_comp); |
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} |
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static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) |
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{ |
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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_GET_TIME, tm, tc, NULL, NULL, NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_efi_set_time(efi_time_t *tm) |
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{ |
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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_SET_TIME, tm, NULL, NULL, NULL, NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_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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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_GET_WAKEUP_TIME, enabled, pending, tm, NULL, |
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NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) |
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{ |
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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_SET_WAKEUP_TIME, &enabled, tm, NULL, NULL, |
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NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_efi_get_variable(efi_char16_t *name, |
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efi_guid_t *vendor, |
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u32 *attr, |
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unsigned long *data_size, |
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void *data) |
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{ |
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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_GET_VARIABLE, name, vendor, attr, data_size, |
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data); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_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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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_GET_NEXT_VARIABLE, name_size, name, vendor, |
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NULL, NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_efi_set_variable(efi_char16_t *name, |
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efi_guid_t *vendor, |
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u32 attr, |
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unsigned long data_size, |
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void *data) |
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{ |
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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_SET_VARIABLE, name, vendor, &attr, &data_size, |
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data); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t |
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virt_efi_set_variable_nonblocking(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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efi_status_t status; |
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if (down_trylock(&efi_runtime_lock)) |
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return EFI_NOT_READY; |
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status = efi_call_virt(set_variable, name, vendor, attr, data_size, |
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data); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_efi_query_variable_info(u32 attr, |
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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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efi_status_t status; |
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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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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_QUERY_VARIABLE_INFO, &attr, storage_space, |
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remaining_space, max_variable_size, NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t |
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virt_efi_query_variable_info_nonblocking(u32 attr, |
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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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efi_status_t status; |
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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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if (down_trylock(&efi_runtime_lock)) |
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return EFI_NOT_READY; |
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status = efi_call_virt(query_variable_info, attr, storage_space, |
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remaining_space, max_variable_size); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) |
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{ |
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efi_status_t status; |
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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_GET_NEXT_HIGH_MONO_COUNT, count, NULL, NULL, |
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NULL, NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static void virt_efi_reset_system(int reset_type, |
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efi_status_t status, |
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unsigned long data_size, |
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efi_char16_t *data) |
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{ |
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if (down_interruptible(&efi_runtime_lock)) { |
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pr_warn("failed to invoke the reset_system() runtime service:\n" |
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"could not get exclusive access to the firmware\n"); |
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return; |
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} |
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efi_rts_work.efi_rts_id = EFI_RESET_SYSTEM; |
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__efi_call_virt(reset_system, reset_type, status, data_size, data); |
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up(&efi_runtime_lock); |
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} |
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static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, |
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unsigned long count, |
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unsigned long sg_list) |
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{ |
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efi_status_t status; |
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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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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_UPDATE_CAPSULE, capsules, &count, &sg_list, |
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NULL, NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, |
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unsigned long count, |
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u64 *max_size, |
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int *reset_type) |
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{ |
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efi_status_t status; |
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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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if (down_interruptible(&efi_runtime_lock)) |
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return EFI_ABORTED; |
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status = efi_queue_work(EFI_QUERY_CAPSULE_CAPS, capsules, &count, |
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max_size, reset_type, NULL); |
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up(&efi_runtime_lock); |
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return status; |
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} |
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void efi_native_runtime_setup(void) |
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{ |
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efi.get_time = virt_efi_get_time; |
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efi.set_time = virt_efi_set_time; |
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efi.get_wakeup_time = virt_efi_get_wakeup_time; |
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efi.set_wakeup_time = virt_efi_set_wakeup_time; |
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efi.get_variable = virt_efi_get_variable; |
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efi.get_next_variable = virt_efi_get_next_variable; |
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efi.set_variable = virt_efi_set_variable; |
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efi.set_variable_nonblocking = virt_efi_set_variable_nonblocking; |
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efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; |
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efi.reset_system = virt_efi_reset_system; |
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efi.query_variable_info = virt_efi_query_variable_info; |
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efi.query_variable_info_nonblocking = virt_efi_query_variable_info_nonblocking; |
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efi.update_capsule = virt_efi_update_capsule; |
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efi.query_capsule_caps = virt_efi_query_capsule_caps; |
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}
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