tjh.dev
Linux kernel mirror (for testing)
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linux
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
43bool _on_sdei_stack(unsigned long sp);
44static 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 */