/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Preliminary support for HW exception handing for Microblaze
 *
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
 */

#ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
#define _ASM_MICROBLAZE_EXCEPTIONS_H

#ifdef __KERNEL__
#ifndef __ASSEMBLER__

/* 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 /*__ASSEMBLER__ */
#endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */