1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun // Copyright (C) 2017 Arm Ltd.
3*4882a593Smuzhiyun #ifndef __ASM_SDEI_H
4*4882a593Smuzhiyun #define __ASM_SDEI_H
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun /* Values for sdei_exit_mode */
7*4882a593Smuzhiyun #define SDEI_EXIT_HVC 0
8*4882a593Smuzhiyun #define SDEI_EXIT_SMC 1
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #define SDEI_STACK_SIZE IRQ_STACK_SIZE
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #ifndef __ASSEMBLY__
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <linux/linkage.h>
15*4882a593Smuzhiyun #include <linux/preempt.h>
16*4882a593Smuzhiyun #include <linux/types.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include <asm/virt.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun extern unsigned long sdei_exit_mode;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* Software Delegated Exception entry point from firmware*/
23*4882a593Smuzhiyun asmlinkage void __sdei_asm_handler(unsigned long event_num, unsigned long arg,
24*4882a593Smuzhiyun unsigned long pc, unsigned long pstate);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /* and its CONFIG_UNMAP_KERNEL_AT_EL0 trampoline */
27*4882a593Smuzhiyun asmlinkage void __sdei_asm_entry_trampoline(unsigned long event_num,
28*4882a593Smuzhiyun unsigned long arg,
29*4882a593Smuzhiyun unsigned long pc,
30*4882a593Smuzhiyun unsigned long pstate);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun /*
33*4882a593Smuzhiyun * The above entry point does the minimum to call C code. This function does
34*4882a593Smuzhiyun * anything else, before calling the driver.
35*4882a593Smuzhiyun */
36*4882a593Smuzhiyun struct sdei_registered_event;
37*4882a593Smuzhiyun asmlinkage unsigned long __sdei_handler(struct pt_regs *regs,
38*4882a593Smuzhiyun struct sdei_registered_event *arg);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun unsigned long sdei_arch_get_entry_point(int conduit);
41*4882a593Smuzhiyun #define sdei_arch_get_entry_point(x) sdei_arch_get_entry_point(x)
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun struct stack_info;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun bool _on_sdei_stack(unsigned long sp, struct stack_info *info);
on_sdei_stack(unsigned long sp,struct stack_info * info)46*4882a593Smuzhiyun static inline bool on_sdei_stack(unsigned long sp,
47*4882a593Smuzhiyun struct stack_info *info)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun if (!IS_ENABLED(CONFIG_VMAP_STACK))
50*4882a593Smuzhiyun return false;
51*4882a593Smuzhiyun if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
52*4882a593Smuzhiyun return false;
53*4882a593Smuzhiyun if (in_nmi())
54*4882a593Smuzhiyun return _on_sdei_stack(sp, info);
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun return false;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
60*4882a593Smuzhiyun #endif /* __ASM_SDEI_H */
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