1 /*
2  * Preliminary support for HW exception handing for Microblaze
3  *
4  * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
5  * Copyright (C) 2008-2009 PetaLogix
6  * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
7  *
8  * This file is subject to the terms and conditions of the GNU General
9  * Public License. See the file COPYING in the main directory of this
10  * archive for more details.
11  */
12 
13 #ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
14 #define _ASM_MICROBLAZE_EXCEPTIONS_H
15 
16 #ifdef __KERNEL__
17 
18 #ifndef CONFIG_MMU
19 #define EX_HANDLER_STACK_SIZ	(4*19)
20 #endif
21 
22 #ifndef __ASSEMBLY__
23 
24 /* Macros to enable and disable HW exceptions in the MSR */
25 /* Define MSR enable bit for HW exceptions */
26 #define HWEX_MSR_BIT (1 << 8)
27 
28 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
29 #define __enable_hw_exceptions()					\
30 	__asm__ __volatile__ ("	msrset	r0, %0;				\
31 				nop;"					\
32 				:					\
33 				: "i" (HWEX_MSR_BIT)			\
34 				: "memory")
35 
36 #define __disable_hw_exceptions()					\
37 	__asm__ __volatile__ ("	msrclr r0, %0;				\
38 				nop;"					\
39 				:					\
40 				: "i" (HWEX_MSR_BIT)			\
41 				: "memory")
42 #else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
43 #define __enable_hw_exceptions()					\
44 	__asm__ __volatile__ ("						\
45 				mfs	r12, rmsr;			\
46 				nop;					\
47 				ori	r12, r12, %0;			\
48 				mts	rmsr, r12;			\
49 				nop;"					\
50 				:					\
51 				: "i" (HWEX_MSR_BIT)			\
52 				: "memory", "r12")
53 
54 #define __disable_hw_exceptions()					\
55 	__asm__ __volatile__ ("						\
56 				mfs	r12, rmsr;			\
57 				nop;					\
58 				andi	r12, r12, ~%0;			\
59 				mts	rmsr, r12;			\
60 				nop;"					\
61 				:					\
62 				: "i" (HWEX_MSR_BIT)			\
63 				: "memory", "r12")
64 #endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
65 
66 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
67 							int fsr, int addr);
68 
69 asmlinkage void sw_exception(struct pt_regs *regs);
70 void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
71 
72 void die(const char *str, struct pt_regs *fp, long err);
73 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
74 
75 #endif /*__ASSEMBLY__ */
76 #endif /* __KERNEL__ */
77 #endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */
78