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
  20 extern unsigned long sdei_exit_mode;
  21
  22 /* Software Delegated Exception entry point from firmware*/
  23 asmlinkage 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 */
  27 asmlinkage 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  */
  36 struct sdei_registered_event;
  37 asmlinkage unsigned long __sdei_handler(struct pt_regs *regs,
  38                                         struct sdei_registered_event *arg);
  39
  40 unsigned long sdei_arch_get_entry_point(int conduit);
  41 #define sdei_arch_get_entry_point(x)    sdei_arch_get_entry_point(x)
  42
  43 bool _on_sdei_stack(unsigned long sp);
  44 static inline bool on_sdei_stack(unsigned long sp)
  45 {
  46         if (!IS_ENABLED(CONFIG_VMAP_STACK))
  47                 return false;
  48         if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
  49                 return false;
  50         if (in_nmi())
  51                 return _on_sdei_stack(sp);
  52
  53         return false;
  54 }
  55
  56 #endif /* __ASSEMBLY__ */
  57 #endif  /* __ASM_SDEI_H */