exceptions.h

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/*
 * Preliminary support for HW exception handing for Microblaze
 *
 * Copyright (C) 2008-2009 Michal Simek <[email protected]>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2005 John Williams <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file COPYING in the main directory of this
 * archive for more details.
 */

#ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
#define _ASM_MICROBLAZE_EXCEPTIONS_H

#ifdef __KERNEL__

#ifndef CONFIG_MMU
#define EX_HANDLER_STACK_SIZ    (4*19)
#endif

#ifndef __ASSEMBLY__

/* Macros to enable and disable HW exceptions in the MSR */
/* Define MSR enable bit for HW exceptions */
#define HWEX_MSR_BIT (1 << 8)

#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
#define __enable_hw_exceptions()                    \
    __asm__ __volatile__ (" msrset  r0, %0;             \
                nop;"                   \
                :                   \
                : "i" (HWEX_MSR_BIT)            \
                : "memory")

#define __disable_hw_exceptions()                   \
    __asm__ __volatile__ (" msrclr r0, %0;              \
                nop;"                   \
                :                   \
                : "i" (HWEX_MSR_BIT)            \
                : "memory")
#else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
#define __enable_hw_exceptions()                    \
    __asm__ __volatile__ ("                     \
                mfs r12, rmsr;          \
                nop;                    \
                ori r12, r12, %0;           \
                mts rmsr, r12;          \
                nop;"                   \
                :                   \
                : "i" (HWEX_MSR_BIT)            \
                : "memory", "r12")

#define __disable_hw_exceptions()                   \
    __asm__ __volatile__ ("                     \
                mfs r12, rmsr;          \
                nop;                    \
                andi    r12, r12, ~%0;          \
                mts rmsr, r12;          \
                nop;"                   \
                :                   \
                : "i" (HWEX_MSR_BIT)            \
                : "memory", "r12")
#endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */

asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
                            int fsr, int addr);

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

void die(const char *str, struct pt_regs *fp, long err);
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);

#endif /*__ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */