1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public 3*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive 4*4882a593Smuzhiyun * for more details. 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle 7*4882a593Smuzhiyun * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * Protected memory access. Used for everything that might take revenge 10*4882a593Smuzhiyun * by sending a DBE error like accessing possibly non-existent memory or 11*4882a593Smuzhiyun * devices. 12*4882a593Smuzhiyun */ 13*4882a593Smuzhiyun #ifndef _ASM_PACCESS_H 14*4882a593Smuzhiyun #define _ASM_PACCESS_H 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #include <linux/errno.h> 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun #ifdef CONFIG_32BIT 19*4882a593Smuzhiyun #define __PA_ADDR ".word" 20*4882a593Smuzhiyun #endif 21*4882a593Smuzhiyun #ifdef CONFIG_64BIT 22*4882a593Smuzhiyun #define __PA_ADDR ".dword" 23*4882a593Smuzhiyun #endif 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun extern asmlinkage void handle_ibe(void); 26*4882a593Smuzhiyun extern asmlinkage void handle_dbe(void); 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun #define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr))) 29*4882a593Smuzhiyun #define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr))) 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun struct __large_pstruct { unsigned long buf[100]; }; 32*4882a593Smuzhiyun #define __mp(x) (*(struct __large_pstruct *)(x)) 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun #define __get_dbe(x, ptr, size) \ 35*4882a593Smuzhiyun ({ \ 36*4882a593Smuzhiyun long __gu_err; \ 37*4882a593Smuzhiyun __typeof__(*(ptr)) __gu_val; \ 38*4882a593Smuzhiyun unsigned long __gu_addr; \ 39*4882a593Smuzhiyun __asm__("":"=r" (__gu_val)); \ 40*4882a593Smuzhiyun __gu_addr = (unsigned long) (ptr); \ 41*4882a593Smuzhiyun __asm__("":"=r" (__gu_err)); \ 42*4882a593Smuzhiyun switch (size) { \ 43*4882a593Smuzhiyun case 1: __get_dbe_asm("lb"); break; \ 44*4882a593Smuzhiyun case 2: __get_dbe_asm("lh"); break; \ 45*4882a593Smuzhiyun case 4: __get_dbe_asm("lw"); break; \ 46*4882a593Smuzhiyun case 8: __get_dbe_asm("ld"); break; \ 47*4882a593Smuzhiyun default: __get_dbe_unknown(); break; \ 48*4882a593Smuzhiyun } \ 49*4882a593Smuzhiyun x = (__typeof__(*(ptr))) __gu_val; \ 50*4882a593Smuzhiyun __gu_err; \ 51*4882a593Smuzhiyun }) 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun #define __get_dbe_asm(insn) \ 54*4882a593Smuzhiyun { \ 55*4882a593Smuzhiyun __asm__ __volatile__( \ 56*4882a593Smuzhiyun "1:\t" insn "\t%1,%2\n\t" \ 57*4882a593Smuzhiyun "move\t%0,$0\n" \ 58*4882a593Smuzhiyun "2:\n\t" \ 59*4882a593Smuzhiyun ".insn\n\t" \ 60*4882a593Smuzhiyun ".section\t.fixup,\"ax\"\n" \ 61*4882a593Smuzhiyun "3:\tli\t%0,%3\n\t" \ 62*4882a593Smuzhiyun "move\t%1,$0\n\t" \ 63*4882a593Smuzhiyun "j\t2b\n\t" \ 64*4882a593Smuzhiyun ".previous\n\t" \ 65*4882a593Smuzhiyun ".section\t__dbe_table,\"a\"\n\t" \ 66*4882a593Smuzhiyun __PA_ADDR "\t1b, 3b\n\t" \ 67*4882a593Smuzhiyun ".previous" \ 68*4882a593Smuzhiyun :"=r" (__gu_err), "=r" (__gu_val) \ 69*4882a593Smuzhiyun :"o" (__mp(__gu_addr)), "i" (-EFAULT)); \ 70*4882a593Smuzhiyun } 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun extern void __get_dbe_unknown(void); 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun #define __put_dbe(x, ptr, size) \ 75*4882a593Smuzhiyun ({ \ 76*4882a593Smuzhiyun long __pu_err; \ 77*4882a593Smuzhiyun __typeof__(*(ptr)) __pu_val; \ 78*4882a593Smuzhiyun long __pu_addr; \ 79*4882a593Smuzhiyun __pu_val = (x); \ 80*4882a593Smuzhiyun __pu_addr = (long) (ptr); \ 81*4882a593Smuzhiyun __asm__("":"=r" (__pu_err)); \ 82*4882a593Smuzhiyun switch (size) { \ 83*4882a593Smuzhiyun case 1: __put_dbe_asm("sb"); break; \ 84*4882a593Smuzhiyun case 2: __put_dbe_asm("sh"); break; \ 85*4882a593Smuzhiyun case 4: __put_dbe_asm("sw"); break; \ 86*4882a593Smuzhiyun case 8: __put_dbe_asm("sd"); break; \ 87*4882a593Smuzhiyun default: __put_dbe_unknown(); break; \ 88*4882a593Smuzhiyun } \ 89*4882a593Smuzhiyun __pu_err; \ 90*4882a593Smuzhiyun }) 91*4882a593Smuzhiyun 92*4882a593Smuzhiyun #define __put_dbe_asm(insn) \ 93*4882a593Smuzhiyun { \ 94*4882a593Smuzhiyun __asm__ __volatile__( \ 95*4882a593Smuzhiyun "1:\t" insn "\t%1,%2\n\t" \ 96*4882a593Smuzhiyun "move\t%0,$0\n" \ 97*4882a593Smuzhiyun "2:\n\t" \ 98*4882a593Smuzhiyun ".insn\n\t" \ 99*4882a593Smuzhiyun ".section\t.fixup,\"ax\"\n" \ 100*4882a593Smuzhiyun "3:\tli\t%0,%3\n\t" \ 101*4882a593Smuzhiyun "j\t2b\n\t" \ 102*4882a593Smuzhiyun ".previous\n\t" \ 103*4882a593Smuzhiyun ".section\t__dbe_table,\"a\"\n\t" \ 104*4882a593Smuzhiyun __PA_ADDR "\t1b, 3b\n\t" \ 105*4882a593Smuzhiyun ".previous" \ 106*4882a593Smuzhiyun : "=r" (__pu_err) \ 107*4882a593Smuzhiyun : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \ 108*4882a593Smuzhiyun } 109*4882a593Smuzhiyun 110*4882a593Smuzhiyun extern void __put_dbe_unknown(void); 111*4882a593Smuzhiyun 112*4882a593Smuzhiyun extern unsigned long search_dbe_table(unsigned long addr); 113*4882a593Smuzhiyun 114*4882a593Smuzhiyun #endif /* _ASM_PACCESS_H */ 115