LXR linux/arch/arm64/include/asm/sdei.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2// Copyright (C) 2017 Arm Ltd.
   3#ifndef __ASM_SDEI_H
   4#define __ASM_SDEI_H
   5
   6/* Values for sdei_exit_mode */
   7#define SDEI_EXIT_HVC  0
   8#define SDEI_EXIT_SMC  1
   9
  10#define SDEI_STACK_SIZE         IRQ_STACK_SIZE
  11
  12#ifndef __ASSEMBLY__
  13
  14#include <linux/linkage.h>
  15#include <linux/preempt.h>
  16#include <linux/types.h>
  17
  18#include <asm/virt.h>
  19
  20extern unsigned long sdei_exit_mode;
  21
  22/* Software Delegated Exception entry point from firmware*/
  23asmlinkage void __sdei_asm_handler(unsigned long event_num, unsigned long arg,
  24                                   unsigned long pc, unsigned long pstate);
  25
  26/* and its CONFIG_UNMAP_KERNEL_AT_EL0 trampoline */
  27asmlinkage void __sdei_asm_entry_trampoline(unsigned long event_num,
  28                                                   unsigned long arg,
  29                                                   unsigned long pc,
  30                                                   unsigned long pstate);
  31
  32/*
  33 * The above entry point does the minimum to call C code. This function does
  34 * anything else, before calling the driver.
  35 */
  36struct sdei_registered_event;
  37asmlinkage unsigned long __sdei_handler(struct pt_regs *regs,
  38                                        struct sdei_registered_event *arg);
  39
  40unsigned long sdei_arch_get_entry_point(int conduit);
  41#define sdei_arch_get_entry_point(x)    sdei_arch_get_entry_point(x)
  42
  43struct stack_info;
  44
  45bool _on_sdei_stack(unsigned long sp, struct stack_info *info);
  46static inline bool on_sdei_stack(unsigned long sp,
  47                                struct stack_info *info)
  48{
  49        if (!IS_ENABLED(CONFIG_VMAP_STACK))
  50                return false;
  51        if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
  52                return false;
  53        if (in_nmi())
  54                return _on_sdei_stack(sp, info);
  55
  56        return false;
  57}
  58
  59#endif /* __ASSEMBLY__ */
  60#endif  /* __ASM_SDEI_H */
  61