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 
58 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
59 							int fsr, int addr);
60 
61 asmlinkage void sw_exception(struct pt_regs *regs);
62 void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
63 
64 void die(const char *str, struct pt_regs *fp, long err);
65 void _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