diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h index d3cb42fd51ec2d33d4085c25f132b79875550ed8..647ea987da0e2b89e5e11e29deb231c07812abf5 100644 --- a/arch/arm64/include/asm/efi.h +++ b/arch/arm64/include/asm/efi.h @@ -11,11 +11,20 @@ #include #include #include +#include #ifdef CONFIG_EFI extern void efi_init(void); + +bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg); #else #define efi_init() + +static inline +bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg) +{ + return false; +} #endif int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); @@ -25,6 +34,7 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); ({ \ efi_virtmap_load(); \ __efi_fpsimd_begin(); \ + raw_spin_lock(&efi_rt_lock); \ }) #define arch_efi_call_virt(p, f, args...) \ @@ -36,10 +46,12 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); #define arch_efi_call_virt_teardown() \ ({ \ + raw_spin_unlock(&efi_rt_lock); \ __efi_fpsimd_end(); \ efi_virtmap_unload(); \ }) +extern raw_spinlock_t efi_rt_lock; efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...); #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT) diff --git a/arch/arm64/kernel/efi-rt-wrapper.S b/arch/arm64/kernel/efi-rt-wrapper.S index 05235ebb336d92e2c45b70f070f217e7e44ac1f6..a9ae26e176f1c8adfd6371150c061098050c68e8 100644 --- a/arch/arm64/kernel/efi-rt-wrapper.S +++ b/arch/arm64/kernel/efi-rt-wrapper.S @@ -7,9 +7,10 @@ */ #include +#include ENTRY(__efi_rt_asm_wrapper) - stp x29, x30, [sp, #-32]! + stp x29, x30, [sp, #-112]! mov x29, sp /* @@ -19,6 +20,22 @@ ENTRY(__efi_rt_asm_wrapper) */ stp x1, x18, [sp, #16] + /* + * Preserve all callee saved registers and preserve the stack pointer + * value at the base of the EFI runtime stack so we can recover from + * synchronous exceptions occurring while executing the firmware + * routines. + */ + stp x19, x20, [sp, #32] + stp x21, x22, [sp, #48] + stp x23, x24, [sp, #64] + stp x25, x26, [sp, #80] + stp x27, x28, [sp, #96] + + ldr_l x16, efi_rt_stack_top + mov sp, x16 + stp x18, x29, [sp, #-16]! + /* * We are lucky enough that no EFI runtime services take more than * 5 arguments, so all are passed in registers rather than via the @@ -32,10 +49,36 @@ ENTRY(__efi_rt_asm_wrapper) mov x4, x6 blr x8 + mov sp, x29 ldp x1, x2, [sp, #16] cmp x2, x18 - ldp x29, x30, [sp], #32 + ldp x29, x30, [sp], #112 b.ne 0f ret -0: b efi_handle_corrupted_x18 // tail call +0: + /* + * With CONFIG_SHADOW_CALL_STACK, the kernel uses x18 to store a + * shadow stack pointer, which we need to restore before returning to + * potentially instrumented code. This is safe because the wrapper is + * called with preemption disabled and a separate shadow stack is used + * for interrupts. + */ +#ifdef CONFIG_SHADOW_CALL_STACK + ldr_l x18, efi_rt_stack_top + ldr x18, [x18, #-16] +#endif + + b efi_handle_corrupted_x18 // tail call ENDPROC(__efi_rt_asm_wrapper) + +ENTRY(__efi_rt_asm_recover) + mov sp, x30 + + ldp x19, x20, [sp, #32] + ldp x21, x22, [sp, #48] + ldp x23, x24, [sp, #64] + ldp x25, x26, [sp, #80] + ldp x27, x28, [sp, #96] + ldp x29, x30, [sp], #112 + ret +ENDPROC(__efi_rt_asm_recover) diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index 4f9acb5fbe97053504d2d61c60a083093f1382f0..b2a3d5f5d36f56a244baaa0071a0f13e24992f82 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -132,3 +132,53 @@ asmlinkage efi_status_t efi_handle_corrupted_x18(efi_status_t s, const char *f) pr_err_ratelimited(FW_BUG "register x18 corrupted by EFI %s\n", f); return s; } + +DEFINE_RAW_SPINLOCK(efi_rt_lock); + +asmlinkage u64 *efi_rt_stack_top __ro_after_init; + +asmlinkage efi_status_t __efi_rt_asm_recover(void); + +bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg) +{ + /* Check whether the exception occurred while running the firmware */ + if (current_work() != &efi_rts_work.work || regs->pc >= TASK_SIZE_64) + return false; + + pr_err(FW_BUG "Unable to handle %s in EFI runtime service\n", msg); + add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); + clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); + + regs->regs[0] = EFI_ABORTED; + regs->regs[30] = efi_rt_stack_top[-1]; + regs->pc = (u64)__efi_rt_asm_recover; + + if (IS_ENABLED(CONFIG_SHADOW_CALL_STACK)) + regs->regs[18] = efi_rt_stack_top[-2]; + + return true; +} + +/* EFI requires 8 KiB of stack space for runtime services */ +static_assert(THREAD_SIZE >= SZ_8K); + +static int __init arm64_efi_rt_init(void) +{ + void *p; + + if (!efi_enabled(EFI_RUNTIME_SERVICES)) + return 0; + + p = __vmalloc_node(THREAD_SIZE, THREAD_ALIGN, GFP_KERNEL, + PAGE_KERNEL, 0, + NUMA_NO_NODE, &&l); +l: if (!p) { + pr_warn("Failed to allocate EFI runtime stack\n"); + clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); + return -ENOMEM; + } + + efi_rt_stack_top = p + THREAD_SIZE; + return 0; +} +core_initcall(arm64_efi_rt_init); diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 96bfdade877ae066a2dd9574b83c414e329d8e26..a3c33ccecd839f8426a744cc7e27ab3c8bdd92ea 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -332,6 +333,9 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr, msg = "paging request"; } + if (efi_runtime_fixup_exception(regs, msg)) + return; + die_kernel_fault(msg, addr, esr, regs); } diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h index 00aa9de5abbb19ce4184523ba4b3d3a1d3467022..eea57447ee5676fd29b55da44036add63e601284 100644 --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -137,6 +137,7 @@ extern void __init efi_apply_memmap_quirks(void); extern int __init efi_reuse_config(u64 tables, int nr_tables); extern void efi_delete_dummy_variable(void); extern void efi_switch_mm(struct mm_struct *mm); +extern void efi_recover_from_page_fault(unsigned long phys_addr); struct efi_setup_data { u64 fw_vendor; diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 52c8cbbd5a65b953652c0773fced29b4ca1602df..a9d03d3bacec668902e05a7c1c1d4334af0401ad 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -16,6 +16,7 @@ #include /* prefetchw */ #include /* exception_enter(), ... */ #include /* faulthandler_disabled() */ +#include /* efi_recover_from_page_fault()*/ #include #include /* boot_cpu_has, ... */ @@ -25,6 +26,7 @@ #include /* emulate_vsyscall */ #include /* struct vm86 */ #include /* vma_pkey() */ +#include /* efi_recover_from_page_fault()*/ #define CREATE_TRACE_POINTS #include @@ -805,6 +807,13 @@ no_context(struct pt_regs *regs, unsigned long error_code, if (is_errata93(regs, address)) return; + /* + * Buggy firmware could access regions which might page fault, try to + * recover from such faults. + */ + if (IS_ENABLED(CONFIG_EFI)) + efi_recover_from_page_fault(address); + /* * Oops. The kernel tried to access some bad page. We'll have to * terminate things with extreme prejudice: diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c index 006eb09e95879e0b1f8c8276ae75226dd097c139..d80603886a29e0c459adf1e7b0c6545e9da199fb 100644 --- a/arch/x86/platform/efi/quirks.c +++ b/arch/x86/platform/efi/quirks.c @@ -16,6 +16,7 @@ #include #include #include +#include #define EFI_MIN_RESERVE 5120 @@ -653,3 +654,80 @@ int efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff, } #endif + +/* + * If any access by any efi runtime service causes a page fault, then, + * 1. If it's efi_reset_system(), reboot through BIOS. + * 2. If any other efi runtime service, then + * a. Return error status to the efi caller process. + * b. Disable EFI Runtime Services forever and + * c. Freeze efi_rts_wq and schedule new process. + * + * @return: Returns, if the page fault is not handled. This function + * will never return if the page fault is handled successfully. + */ +void efi_recover_from_page_fault(unsigned long phys_addr) +{ + if (!IS_ENABLED(CONFIG_X86_64)) + return; + + /* + * Make sure that an efi runtime service caused the page fault. + * "efi_mm" cannot be used to check if the page fault had occurred + * in the firmware context because efi=old_map doesn't use efi_pgd. + */ + if (efi_rts_work.efi_rts_id == EFI_NONE) + return; + + /* + * Address range 0x0000 - 0x0fff is always mapped in the efi_pgd, so + * page faulting on these addresses isn't expected. + */ + if (phys_addr <= 0x0fff) + return; + + /* + * Print stack trace as it might be useful to know which EFI Runtime + * Service is buggy. + */ + WARN(1, FW_BUG "Page fault caused by firmware at PA: 0x%lx\n", + phys_addr); + + /* + * Buggy efi_reset_system() is handled differently from other EFI + * Runtime Services as it doesn't use efi_rts_wq. Although, + * native_machine_emergency_restart() says that machine_real_restart() + * could fail, it's better not to compilcate this fault handler + * because this case occurs *very* rarely and hence could be improved + * on a need by basis. + */ + if (efi_rts_work.efi_rts_id == EFI_RESET_SYSTEM) { + pr_info("efi_reset_system() buggy! Reboot through BIOS\n"); + machine_real_restart(MRR_BIOS); + return; + } + + /* + * Before calling EFI Runtime Service, the kernel has switched the + * calling process to efi_mm. Hence, switch back to task_mm. + */ + arch_efi_call_virt_teardown(); + + /* Signal error status to the efi caller process */ + efi_rts_work.status = EFI_ABORTED; + complete(&efi_rts_work.efi_rts_comp); + + clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); + pr_info("Froze efi_rts_wq and disabled EFI Runtime Services\n"); + + /* + * Call schedule() in an infinite loop, so that any spurious wake ups + * will never run efi_rts_wq again. + */ + for (;;) { + set_current_state(TASK_IDLE); + schedule(); + } + + return; +} diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c index cec6558bf33a6c16a3c6340993487426a761382f..cba62aded6d1885d9ea509f5ab503edee3219c09 100644 --- a/drivers/firmware/efi/runtime-wrappers.c +++ b/drivers/firmware/efi/runtime-wrappers.c @@ -45,39 +45,7 @@ #define __efi_call_virt(f, args...) \ __efi_call_virt_pointer(efi.systab->runtime, f, args) -/* efi_runtime_service() function identifiers */ -enum efi_rts_ids { - GET_TIME, - SET_TIME, - GET_WAKEUP_TIME, - SET_WAKEUP_TIME, - GET_VARIABLE, - GET_NEXT_VARIABLE, - SET_VARIABLE, - QUERY_VARIABLE_INFO, - GET_NEXT_HIGH_MONO_COUNT, - UPDATE_CAPSULE, - QUERY_CAPSULE_CAPS, -}; - -/* - * efi_runtime_work: Details of EFI Runtime Service work - * @arg<1-5>: EFI Runtime Service function arguments - * @status: Status of executing EFI Runtime Service - * @efi_rts_id: EFI Runtime Service function identifier - * @efi_rts_comp: Struct used for handling completions - */ -struct efi_runtime_work { - void *arg1; - void *arg2; - void *arg3; - void *arg4; - void *arg5; - efi_status_t status; - struct work_struct work; - enum efi_rts_ids efi_rts_id; - struct completion efi_rts_comp; -}; +struct efi_runtime_work efi_rts_work; /* * efi_queue_work: Queue efi_runtime_service() and wait until it's done @@ -91,11 +59,16 @@ struct efi_runtime_work { */ #define efi_queue_work(_rts, _arg1, _arg2, _arg3, _arg4, _arg5) \ ({ \ - struct efi_runtime_work efi_rts_work; \ efi_rts_work.status = EFI_ABORTED; \ \ + if (!efi_enabled(EFI_RUNTIME_SERVICES)) { \ + pr_warn_once("EFI Runtime Services are disabled!\n"); \ + efi_rts_work.status = EFI_DEVICE_ERROR; \ + goto exit; \ + } \ + \ init_completion(&efi_rts_work.efi_rts_comp); \ - INIT_WORK_ONSTACK(&efi_rts_work.work, efi_call_rts); \ + INIT_WORK(&efi_rts_work.work, efi_call_rts); \ efi_rts_work.arg1 = _arg1; \ efi_rts_work.arg2 = _arg2; \ efi_rts_work.arg3 = _arg3; \ @@ -112,6 +85,9 @@ struct efi_runtime_work { else \ pr_err("Failed to queue work to efi_rts_wq.\n"); \ \ + WARN_ON_ONCE(efi_rts_work.status == EFI_ABORTED); \ +exit: \ + efi_rts_work.efi_rts_id = EFI_NONE; \ efi_rts_work.status; \ }) @@ -204,62 +180,60 @@ extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock); */ static void efi_call_rts(struct work_struct *work) { - struct efi_runtime_work *efi_rts_work; void *arg1, *arg2, *arg3, *arg4, *arg5; efi_status_t status = EFI_NOT_FOUND; - efi_rts_work = container_of(work, struct efi_runtime_work, work); - arg1 = efi_rts_work->arg1; - arg2 = efi_rts_work->arg2; - arg3 = efi_rts_work->arg3; - arg4 = efi_rts_work->arg4; - arg5 = efi_rts_work->arg5; + arg1 = efi_rts_work.arg1; + arg2 = efi_rts_work.arg2; + arg3 = efi_rts_work.arg3; + arg4 = efi_rts_work.arg4; + arg5 = efi_rts_work.arg5; - switch (efi_rts_work->efi_rts_id) { - case GET_TIME: + switch (efi_rts_work.efi_rts_id) { + case EFI_GET_TIME: status = efi_call_virt(get_time, (efi_time_t *)arg1, (efi_time_cap_t *)arg2); break; - case SET_TIME: + case EFI_SET_TIME: status = efi_call_virt(set_time, (efi_time_t *)arg1); break; - case GET_WAKEUP_TIME: + case EFI_GET_WAKEUP_TIME: status = efi_call_virt(get_wakeup_time, (efi_bool_t *)arg1, (efi_bool_t *)arg2, (efi_time_t *)arg3); break; - case SET_WAKEUP_TIME: + case EFI_SET_WAKEUP_TIME: status = efi_call_virt(set_wakeup_time, *(efi_bool_t *)arg1, (efi_time_t *)arg2); break; - case GET_VARIABLE: + case EFI_GET_VARIABLE: status = efi_call_virt(get_variable, (efi_char16_t *)arg1, (efi_guid_t *)arg2, (u32 *)arg3, (unsigned long *)arg4, (void *)arg5); break; - case GET_NEXT_VARIABLE: + case EFI_GET_NEXT_VARIABLE: status = efi_call_virt(get_next_variable, (unsigned long *)arg1, (efi_char16_t *)arg2, (efi_guid_t *)arg3); break; - case SET_VARIABLE: + case EFI_SET_VARIABLE: status = efi_call_virt(set_variable, (efi_char16_t *)arg1, (efi_guid_t *)arg2, *(u32 *)arg3, *(unsigned long *)arg4, (void *)arg5); break; - case QUERY_VARIABLE_INFO: + case EFI_QUERY_VARIABLE_INFO: status = efi_call_virt(query_variable_info, *(u32 *)arg1, (u64 *)arg2, (u64 *)arg3, (u64 *)arg4); break; - case GET_NEXT_HIGH_MONO_COUNT: + case EFI_GET_NEXT_HIGH_MONO_COUNT: status = efi_call_virt(get_next_high_mono_count, (u32 *)arg1); break; - case UPDATE_CAPSULE: + case EFI_UPDATE_CAPSULE: status = efi_call_virt(update_capsule, (efi_capsule_header_t **)arg1, *(unsigned long *)arg2, *(unsigned long *)arg3); break; - case QUERY_CAPSULE_CAPS: + case EFI_QUERY_CAPSULE_CAPS: status = efi_call_virt(query_capsule_caps, (efi_capsule_header_t **)arg1, *(unsigned long *)arg2, (u64 *)arg3, @@ -273,8 +247,8 @@ static void efi_call_rts(struct work_struct *work) */ pr_err("Requested executing invalid EFI Runtime Service.\n"); } - efi_rts_work->status = status; - complete(&efi_rts_work->efi_rts_comp); + efi_rts_work.status = status; + complete(&efi_rts_work.efi_rts_comp); } static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) @@ -283,7 +257,7 @@ static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(GET_TIME, tm, tc, NULL, NULL, NULL); + status = efi_queue_work(EFI_GET_TIME, tm, tc, NULL, NULL, NULL); up(&efi_runtime_lock); return status; } @@ -294,7 +268,7 @@ static efi_status_t virt_efi_set_time(efi_time_t *tm) if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(SET_TIME, tm, NULL, NULL, NULL, NULL); + status = efi_queue_work(EFI_SET_TIME, tm, NULL, NULL, NULL, NULL); up(&efi_runtime_lock); return status; } @@ -307,7 +281,7 @@ static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(GET_WAKEUP_TIME, enabled, pending, tm, NULL, + status = efi_queue_work(EFI_GET_WAKEUP_TIME, enabled, pending, tm, NULL, NULL); up(&efi_runtime_lock); return status; @@ -319,7 +293,7 @@ static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(SET_WAKEUP_TIME, &enabled, tm, NULL, NULL, + status = efi_queue_work(EFI_SET_WAKEUP_TIME, &enabled, tm, NULL, NULL, NULL); up(&efi_runtime_lock); return status; @@ -335,7 +309,7 @@ static efi_status_t virt_efi_get_variable(efi_char16_t *name, if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(GET_VARIABLE, name, vendor, attr, data_size, + status = efi_queue_work(EFI_GET_VARIABLE, name, vendor, attr, data_size, data); up(&efi_runtime_lock); return status; @@ -349,7 +323,7 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(GET_NEXT_VARIABLE, name_size, name, vendor, + status = efi_queue_work(EFI_GET_NEXT_VARIABLE, name_size, name, vendor, NULL, NULL); up(&efi_runtime_lock); return status; @@ -365,7 +339,7 @@ static efi_status_t virt_efi_set_variable(efi_char16_t *name, if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(SET_VARIABLE, name, vendor, &attr, &data_size, + status = efi_queue_work(EFI_SET_VARIABLE, name, vendor, &attr, &data_size, data); up(&efi_runtime_lock); return status; @@ -400,7 +374,7 @@ static efi_status_t virt_efi_query_variable_info(u32 attr, if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(QUERY_VARIABLE_INFO, &attr, storage_space, + status = efi_queue_work(EFI_QUERY_VARIABLE_INFO, &attr, storage_space, remaining_space, max_variable_size, NULL); up(&efi_runtime_lock); return status; @@ -432,7 +406,7 @@ static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(GET_NEXT_HIGH_MONO_COUNT, count, NULL, NULL, + status = efi_queue_work(EFI_GET_NEXT_HIGH_MONO_COUNT, count, NULL, NULL, NULL, NULL); up(&efi_runtime_lock); return status; @@ -448,6 +422,7 @@ static void virt_efi_reset_system(int reset_type, "could not get exclusive access to the firmware\n"); return; } + efi_rts_work.efi_rts_id = EFI_RESET_SYSTEM; __efi_call_virt(reset_system, reset_type, status, data_size, data); up(&efi_runtime_lock); } @@ -463,7 +438,7 @@ static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(UPDATE_CAPSULE, capsules, &count, &sg_list, + status = efi_queue_work(EFI_UPDATE_CAPSULE, capsules, &count, &sg_list, NULL, NULL); up(&efi_runtime_lock); return status; @@ -481,7 +456,7 @@ static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, if (down_interruptible(&efi_runtime_lock)) return EFI_ABORTED; - status = efi_queue_work(QUERY_CAPSULE_CAPS, capsules, &count, + status = efi_queue_work(EFI_QUERY_CAPSULE_CAPS, capsules, &count, max_size, reset_type, NULL); up(&efi_runtime_lock); return status; diff --git a/include/linux/efi.h b/include/linux/efi.h index b90423d1128bc489f6bd67ffd73da4656ce95eea..8fbab420b265bc1ea213a460e992cb8f3aa74db8 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1684,6 +1684,48 @@ struct linux_efi_tpm_eventlog { extern int efi_tpm_eventlog_init(void); +/* + * efi_runtime_service() function identifiers. + * "NONE" is used by efi_recover_from_page_fault() to check if the page + * fault happened while executing an efi runtime service. + */ +enum efi_rts_ids { + EFI_NONE, + EFI_GET_TIME, + EFI_SET_TIME, + EFI_GET_WAKEUP_TIME, + EFI_SET_WAKEUP_TIME, + EFI_GET_VARIABLE, + EFI_GET_NEXT_VARIABLE, + EFI_SET_VARIABLE, + EFI_QUERY_VARIABLE_INFO, + EFI_GET_NEXT_HIGH_MONO_COUNT, + EFI_RESET_SYSTEM, + EFI_UPDATE_CAPSULE, + EFI_QUERY_CAPSULE_CAPS, +}; + +/* + * efi_runtime_work: Details of EFI Runtime Service work + * @arg<1-5>: EFI Runtime Service function arguments + * @status: Status of executing EFI Runtime Service + * @efi_rts_id: EFI Runtime Service function identifier + * @efi_rts_comp: Struct used for handling completions + */ +struct efi_runtime_work { + void *arg1; + void *arg2; + void *arg3; + void *arg4; + void *arg5; + efi_status_t status; + struct work_struct work; + enum efi_rts_ids efi_rts_id; + struct completion efi_rts_comp; +}; + +extern struct efi_runtime_work efi_rts_work; + /* Workqueue to queue EFI Runtime Services */ extern struct workqueue_struct *efi_rts_wq;