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 struct stack_info;
44
45 bool _on_sdei_stack(unsigned long sp, struct stack_info *info);
on_sdei_stack(unsigned long sp,struct stack_info * info)46 static 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