14726dd60SMichal Simek /* SPDX-License-Identifier: GPL-2.0 */
2c4df4bc1SMichal Simek /*
3c4df4bc1SMichal Simek  * Preliminary support for HW exception handing for Microblaze
4c4df4bc1SMichal Simek  *
517f3324cSMichal Simek  * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
617f3324cSMichal Simek  * Copyright (C) 2008-2009 PetaLogix
7c4df4bc1SMichal Simek  * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
8c4df4bc1SMichal Simek  */
9c4df4bc1SMichal Simek 
10c4df4bc1SMichal Simek #ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
11c4df4bc1SMichal Simek #define _ASM_MICROBLAZE_EXCEPTIONS_H
12c4df4bc1SMichal Simek 
13c4df4bc1SMichal Simek #ifdef __KERNEL__
14c4df4bc1SMichal Simek #ifndef __ASSEMBLY__
15c4df4bc1SMichal Simek 
16c4df4bc1SMichal Simek /* Macros to enable and disable HW exceptions in the MSR */
17c4df4bc1SMichal Simek /* Define MSR enable bit for HW exceptions */
18c4df4bc1SMichal Simek #define HWEX_MSR_BIT (1 << 8)
19c4df4bc1SMichal Simek 
20c4df4bc1SMichal Simek #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
21c4df4bc1SMichal Simek #define __enable_hw_exceptions()					\
22c4df4bc1SMichal Simek 	__asm__ __volatile__ ("	msrset	r0, %0;				\
23c4df4bc1SMichal Simek 				nop;"					\
24c4df4bc1SMichal Simek 				:					\
25c4df4bc1SMichal Simek 				: "i" (HWEX_MSR_BIT)			\
26c4df4bc1SMichal Simek 				: "memory")
27c4df4bc1SMichal Simek 
28c4df4bc1SMichal Simek #define __disable_hw_exceptions()					\
29c4df4bc1SMichal Simek 	__asm__ __volatile__ ("	msrclr r0, %0;				\
30c4df4bc1SMichal Simek 				nop;"					\
31c4df4bc1SMichal Simek 				:					\
32c4df4bc1SMichal Simek 				: "i" (HWEX_MSR_BIT)			\
33c4df4bc1SMichal Simek 				: "memory")
34c4df4bc1SMichal Simek #else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
35c4df4bc1SMichal Simek #define __enable_hw_exceptions()					\
36c4df4bc1SMichal Simek 	__asm__ __volatile__ ("						\
37c4df4bc1SMichal Simek 				mfs	r12, rmsr;			\
38c4df4bc1SMichal Simek 				nop;					\
39c4df4bc1SMichal Simek 				ori	r12, r12, %0;			\
40c4df4bc1SMichal Simek 				mts	rmsr, r12;			\
41c4df4bc1SMichal Simek 				nop;"					\
42c4df4bc1SMichal Simek 				:					\
43c4df4bc1SMichal Simek 				: "i" (HWEX_MSR_BIT)			\
44c4df4bc1SMichal Simek 				: "memory", "r12")
45c4df4bc1SMichal Simek 
46c4df4bc1SMichal Simek #define __disable_hw_exceptions()					\
47c4df4bc1SMichal Simek 	__asm__ __volatile__ ("						\
48c4df4bc1SMichal Simek 				mfs	r12, rmsr;			\
49c4df4bc1SMichal Simek 				nop;					\
50c4df4bc1SMichal Simek 				andi	r12, r12, ~%0;			\
51c4df4bc1SMichal Simek 				mts	rmsr, r12;			\
52c4df4bc1SMichal Simek 				nop;"					\
53c4df4bc1SMichal Simek 				:					\
54c4df4bc1SMichal Simek 				: "i" (HWEX_MSR_BIT)			\
55c4df4bc1SMichal Simek 				: "memory", "r12")
56c4df4bc1SMichal Simek #endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
57c4df4bc1SMichal Simek 
58c4df4bc1SMichal Simek asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
59c4df4bc1SMichal Simek 							int fsr, int addr);
60c4df4bc1SMichal Simek 
61f699980bSMichal Simek asmlinkage void sw_exception(struct pt_regs *regs);
625213a9c3SMichal Simek void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
63f699980bSMichal Simek 
64ce0b755fSMichal Simek void die(const char *str, struct pt_regs *fp, long err);
65ce0b755fSMichal Simek void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
66ce0b755fSMichal Simek 
67c4df4bc1SMichal Simek #endif /*__ASSEMBLY__ */
68c4df4bc1SMichal Simek #endif /* __KERNEL__ */
69c4df4bc1SMichal Simek #endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */
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