1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Preliminary support for HW exception handing for Microblaze
4 *
5 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
6 * Copyright (C) 2008-2009 PetaLogix
7 * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
8 */
9
10#ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
11#define _ASM_MICROBLAZE_EXCEPTIONS_H
12
13#ifdef __KERNEL__
14#ifndef __ASSEMBLY__
15
16/* Macros to enable and disable HW exceptions in the MSR */
17/* Define MSR enable bit for HW exceptions */
18#define HWEX_MSR_BIT (1 << 8)
19
20#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
21#define __enable_hw_exceptions()					\
22	__asm__ __volatile__ ("	msrset	r0, %0;				\
23				nop;"					\
24				:					\
25				: "i" (HWEX_MSR_BIT)			\
26				: "memory")
27
28#define __disable_hw_exceptions()					\
29	__asm__ __volatile__ ("	msrclr r0, %0;				\
30				nop;"					\
31				:					\
32				: "i" (HWEX_MSR_BIT)			\
33				: "memory")
34#else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
35#define __enable_hw_exceptions()					\
36	__asm__ __volatile__ ("						\
37				mfs	r12, rmsr;			\
38				nop;					\
39				ori	r12, r12, %0;			\
40				mts	rmsr, r12;			\
41				nop;"					\
42				:					\
43				: "i" (HWEX_MSR_BIT)			\
44				: "memory", "r12")
45
46#define __disable_hw_exceptions()					\
47	__asm__ __volatile__ ("						\
48				mfs	r12, rmsr;			\
49				nop;					\
50				andi	r12, r12, ~%0;			\
51				mts	rmsr, r12;			\
52				nop;"					\
53				:					\
54				: "i" (HWEX_MSR_BIT)			\
55				: "memory", "r12")
56#endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
57
58asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
59							int fsr, int addr);
60
61asmlinkage void sw_exception(struct pt_regs *regs);
62void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
63
64void die(const char *str, struct pt_regs *fp, long err);
65void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
66
67#endif /*__ASSEMBLY__ */
68#endif /* __KERNEL__ */
69#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */
70