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
  66 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
  67                                                         int fsr, int addr);
  68
  69 void die(const char *str, struct pt_regs *fp, long err);
  70 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
  71
  72 #endif /*__ASSEMBLY__ */
  73 #endif /* __KERNEL__ */
  74 #endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */