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 */ 75