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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/microblaze/include/asm/exceptions.h
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/*

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 * Preliminary support for HW exception handing for Microblaze

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 *

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 * Copyright (C) 2008-2009 Michal Simek <[email protected]>

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 * Copyright (C) 2008-2009 PetaLogix

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 * Copyright (C) 2005 John Williams <[email protected]>

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 *

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 * This file is subject to the terms and conditions of the GNU General

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 * Public License. See the file COPYING in the main directory of this

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 * archive for more details.

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 */

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#ifndef _ASM_MICROBLAZE_EXCEPTIONS_H

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#define _ASM_MICROBLAZE_EXCEPTIONS_H

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#ifdef __KERNEL__

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#ifndef CONFIG_MMU

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#define EX_HANDLER_STACK_SIZ	(4*19)

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#endif

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#ifndef __ASSEMBLY__

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/* Macros to enable and disable HW exceptions in the MSR */

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/* Define MSR enable bit for HW exceptions */

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#define HWEX_MSR_BIT (1 << 8)

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#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR

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#define __enable_hw_exceptions()					\

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	__asm__ __volatile__ ("	msrset	r0, %0;				\

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				nop;"					\

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				:					\

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				: "i" (HWEX_MSR_BIT)			\

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				: "memory")

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#define __disable_hw_exceptions()					\

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	__asm__ __volatile__ ("	msrclr r0, %0;				\

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				nop;"					\

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				:					\

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				: "i" (HWEX_MSR_BIT)			\

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				: "memory")

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#else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */

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#define __enable_hw_exceptions()					\

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	__asm__ __volatile__ ("						\

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				mfs	r12, rmsr;			\

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				nop;					\

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				ori	r12, r12, %0;			\

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				mts	rmsr, r12;			\

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				nop;"					\

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				:					\

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				: "i" (HWEX_MSR_BIT)			\

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				: "memory", "r12")

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#define __disable_hw_exceptions()					\

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	__asm__ __volatile__ ("						\

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				mfs	r12, rmsr;			\

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				nop;					\

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				andi	r12, r12, ~%0;			\

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				mts	rmsr, r12;			\

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				nop;"					\

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				:					\

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				: "i" (HWEX_MSR_BIT)			\

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				: "memory", "r12")

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#endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */

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asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,

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							int fsr, int addr);

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asmlinkage void sw_exception(struct pt_regs *regs);

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void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);

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void die(const char *str, struct pt_regs *fp, long err);

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void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);

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#endif /*__ASSEMBLY__ */

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#endif /* __KERNEL__ */

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#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */

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