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114 lines
3.1 KiB
114 lines
3.1 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle |
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
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* |
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* Protected memory access. Used for everything that might take revenge |
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* by sending a DBE error like accessing possibly non-existent memory or |
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* devices. |
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*/ |
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#ifndef _ASM_PACCESS_H |
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#define _ASM_PACCESS_H |
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#include <linux/errno.h> |
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#ifdef CONFIG_32BIT |
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#define __PA_ADDR ".word" |
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#endif |
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#ifdef CONFIG_64BIT |
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#define __PA_ADDR ".dword" |
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#endif |
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extern asmlinkage void handle_ibe(void); |
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extern asmlinkage void handle_dbe(void); |
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#define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr))) |
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#define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr))) |
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struct __large_pstruct { unsigned long buf[100]; }; |
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#define __mp(x) (*(struct __large_pstruct *)(x)) |
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#define __get_dbe(x, ptr, size) \ |
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({ \ |
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long __gu_err; \ |
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__typeof__(*(ptr)) __gu_val; \ |
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unsigned long __gu_addr; \ |
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__asm__("":"=r" (__gu_val)); \ |
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__gu_addr = (unsigned long) (ptr); \ |
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__asm__("":"=r" (__gu_err)); \ |
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switch (size) { \ |
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case 1: __get_dbe_asm("lb"); break; \ |
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case 2: __get_dbe_asm("lh"); break; \ |
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case 4: __get_dbe_asm("lw"); break; \ |
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case 8: __get_dbe_asm("ld"); break; \ |
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default: __get_dbe_unknown(); break; \ |
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} \ |
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x = (__typeof__(*(ptr))) __gu_val; \ |
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__gu_err; \ |
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}) |
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#define __get_dbe_asm(insn) \ |
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{ \ |
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__asm__ __volatile__( \ |
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"1:\t" insn "\t%1,%2\n\t" \ |
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"move\t%0,$0\n" \ |
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"2:\n\t" \ |
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".insn\n\t" \ |
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".section\t.fixup,\"ax\"\n" \ |
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"3:\tli\t%0,%3\n\t" \ |
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"move\t%1,$0\n\t" \ |
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"j\t2b\n\t" \ |
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".previous\n\t" \ |
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".section\t__dbe_table,\"a\"\n\t" \ |
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__PA_ADDR "\t1b, 3b\n\t" \ |
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".previous" \ |
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:"=r" (__gu_err), "=r" (__gu_val) \ |
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:"o" (__mp(__gu_addr)), "i" (-EFAULT)); \ |
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} |
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extern void __get_dbe_unknown(void); |
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#define __put_dbe(x, ptr, size) \ |
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({ \ |
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long __pu_err; \ |
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__typeof__(*(ptr)) __pu_val; \ |
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long __pu_addr; \ |
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__pu_val = (x); \ |
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__pu_addr = (long) (ptr); \ |
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__asm__("":"=r" (__pu_err)); \ |
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switch (size) { \ |
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case 1: __put_dbe_asm("sb"); break; \ |
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case 2: __put_dbe_asm("sh"); break; \ |
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case 4: __put_dbe_asm("sw"); break; \ |
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case 8: __put_dbe_asm("sd"); break; \ |
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default: __put_dbe_unknown(); break; \ |
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} \ |
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__pu_err; \ |
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}) |
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#define __put_dbe_asm(insn) \ |
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{ \ |
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__asm__ __volatile__( \ |
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"1:\t" insn "\t%1,%2\n\t" \ |
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"move\t%0,$0\n" \ |
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"2:\n\t" \ |
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".insn\n\t" \ |
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".section\t.fixup,\"ax\"\n" \ |
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"3:\tli\t%0,%3\n\t" \ |
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"j\t2b\n\t" \ |
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".previous\n\t" \ |
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".section\t__dbe_table,\"a\"\n\t" \ |
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__PA_ADDR "\t1b, 3b\n\t" \ |
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".previous" \ |
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: "=r" (__pu_err) \ |
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: "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \ |
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} |
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extern void __put_dbe_unknown(void); |
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extern unsigned long search_dbe_table(unsigned long addr); |
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#endif /* _ASM_PACCESS_H */
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