1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * 9 * Protected memory access. Used for everything that might take revenge 10 * by sending a DBE error like accessing possibly non-existent memory or 11 * devices. 12 */ 13 #ifndef _ASM_PACCESS_H 14 #define _ASM_PACCESS_H 15 16 #include <linux/errno.h> 17 18 #ifdef CONFIG_32BIT 19 #define __PA_ADDR ".word" 20 #endif 21 #ifdef CONFIG_64BIT 22 #define __PA_ADDR ".dword" 23 #endif 24 25 extern asmlinkage void handle_ibe(void); 26 extern asmlinkage void handle_dbe(void); 27 28 #define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr))) 29 #define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr))) 30 31 struct __large_pstruct { unsigned long buf[100]; }; 32 #define __mp(x) (*(struct __large_pstruct *)(x)) 33 34 #define __get_dbe(x, ptr, size) \ 35 ({ \ 36 long __gu_err; \ 37 __typeof__(*(ptr)) __gu_val; \ 38 unsigned long __gu_addr; \ 39 __asm__("":"=r" (__gu_val)); \ 40 __gu_addr = (unsigned long) (ptr); \ 41 __asm__("":"=r" (__gu_err)); \ 42 switch (size) { \ 43 case 1: __get_dbe_asm("lb"); break; \ 44 case 2: __get_dbe_asm("lh"); break; \ 45 case 4: __get_dbe_asm("lw"); break; \ 46 case 8: __get_dbe_asm("ld"); break; \ 47 default: __get_dbe_unknown(); break; \ 48 } \ 49 x = (__typeof__(*(ptr))) __gu_val; \ 50 __gu_err; \ 51 }) 52 53 #define __get_dbe_asm(insn) \ 54 { \ 55 __asm__ __volatile__( \ 56 "1:\t" insn "\t%1,%2\n\t" \ 57 "move\t%0,$0\n" \ 58 "2:\n\t" \ 59 ".section\t.fixup,\"ax\"\n" \ 60 "3:\tli\t%0,%3\n\t" \ 61 "move\t%1,$0\n\t" \ 62 "j\t2b\n\t" \ 63 ".previous\n\t" \ 64 ".section\t__dbe_table,\"a\"\n\t" \ 65 __PA_ADDR "\t1b, 3b\n\t" \ 66 ".previous" \ 67 :"=r" (__gu_err), "=r" (__gu_val) \ 68 :"o" (__mp(__gu_addr)), "i" (-EFAULT)); \ 69 } 70 71 extern void __get_dbe_unknown(void); 72 73 #define __put_dbe(x, ptr, size) \ 74 ({ \ 75 long __pu_err; \ 76 __typeof__(*(ptr)) __pu_val; \ 77 long __pu_addr; \ 78 __pu_val = (x); \ 79 __pu_addr = (long) (ptr); \ 80 __asm__("":"=r" (__pu_err)); \ 81 switch (size) { \ 82 case 1: __put_dbe_asm("sb"); break; \ 83 case 2: __put_dbe_asm("sh"); break; \ 84 case 4: __put_dbe_asm("sw"); break; \ 85 case 8: __put_dbe_asm("sd"); break; \ 86 default: __put_dbe_unknown(); break; \ 87 } \ 88 __pu_err; \ 89 }) 90 91 #define __put_dbe_asm(insn) \ 92 { \ 93 __asm__ __volatile__( \ 94 "1:\t" insn "\t%1,%2\n\t" \ 95 "move\t%0,$0\n" \ 96 "2:\n\t" \ 97 ".section\t.fixup,\"ax\"\n" \ 98 "3:\tli\t%0,%3\n\t" \ 99 "j\t2b\n\t" \ 100 ".previous\n\t" \ 101 ".section\t__dbe_table,\"a\"\n\t" \ 102 __PA_ADDR "\t1b, 3b\n\t" \ 103 ".previous" \ 104 : "=r" (__pu_err) \ 105 : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \ 106 } 107 108 extern void __put_dbe_unknown(void); 109 110 extern unsigned long search_dbe_table(unsigned long addr); 111 112 #endif /* _ASM_PACCESS_H */ 113