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
66asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
67							int fsr, int addr);
68
69asmlinkage void sw_exception(struct pt_regs *regs);
70void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
71
72void die(const char *str, struct pt_regs *fp, long err);
73void _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