LXR linux/arch/microblaze/include/asm/exceptions.h

   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