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author | Arjan van de Ven <arjan@linux.intel.com> | 2008-10-17 09:20:26 -0700 |
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committer | Arjan van de Ven <arjan@linux.intel.com> | 2008-10-17 09:20:26 -0700 |
commit | 651dab4264e4ba0e563f5ff56f748127246e9065 (patch) | |
tree | 016630974bdcb00fe529b673f96d389e0fd6dc94 /arch/mips/include/asm/paccess.h | |
parent | 40b8606253552109815786e5d4b0de98782d31f5 (diff) | |
parent | 2e532d68a2b3e2aa6b19731501222069735c741c (diff) |
Merge commit 'linus/master' into merge-linus
Conflicts:
arch/x86/kvm/i8254.c
Diffstat (limited to 'arch/mips/include/asm/paccess.h')
-rw-r--r-- | arch/mips/include/asm/paccess.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/arch/mips/include/asm/paccess.h b/arch/mips/include/asm/paccess.h new file mode 100644 index 00000000000..c2394f8b0fe --- /dev/null +++ b/arch/mips/include/asm/paccess.h @@ -0,0 +1,112 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * + * Protected memory access. Used for everything that might take revenge + * by sending a DBE error like accessing possibly non-existant memory or + * devices. + */ +#ifndef _ASM_PACCESS_H +#define _ASM_PACCESS_H + +#include <linux/errno.h> + +#ifdef CONFIG_32BIT +#define __PA_ADDR ".word" +#endif +#ifdef CONFIG_64BIT +#define __PA_ADDR ".dword" +#endif + +extern asmlinkage void handle_ibe(void); +extern asmlinkage void handle_dbe(void); + +#define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr))) +#define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr))) + +struct __large_pstruct { unsigned long buf[100]; }; +#define __mp(x) (*(struct __large_pstruct *)(x)) + +#define __get_dbe(x, ptr, size) \ +({ \ + long __gu_err; \ + __typeof__(*(ptr)) __gu_val; \ + unsigned long __gu_addr; \ + __asm__("":"=r" (__gu_val)); \ + __gu_addr = (unsigned long) (ptr); \ + __asm__("":"=r" (__gu_err)); \ + switch (size) { \ + case 1: __get_dbe_asm("lb"); break; \ + case 2: __get_dbe_asm("lh"); break; \ + case 4: __get_dbe_asm("lw"); break; \ + case 8: __get_dbe_asm("ld"); break; \ + default: __get_dbe_unknown(); break; \ + } \ + x = (__typeof__(*(ptr))) __gu_val; \ + __gu_err; \ +}) + +#define __get_dbe_asm(insn) \ +{ \ + __asm__ __volatile__( \ + "1:\t" insn "\t%1,%2\n\t" \ + "move\t%0,$0\n" \ + "2:\n\t" \ + ".section\t.fixup,\"ax\"\n" \ + "3:\tli\t%0,%3\n\t" \ + "move\t%1,$0\n\t" \ + "j\t2b\n\t" \ + ".previous\n\t" \ + ".section\t__dbe_table,\"a\"\n\t" \ + __PA_ADDR "\t1b, 3b\n\t" \ + ".previous" \ + :"=r" (__gu_err), "=r" (__gu_val) \ + :"o" (__mp(__gu_addr)), "i" (-EFAULT)); \ +} + +extern void __get_dbe_unknown(void); + +#define __put_dbe(x, ptr, size) \ +({ \ + long __pu_err; \ + __typeof__(*(ptr)) __pu_val; \ + long __pu_addr; \ + __pu_val = (x); \ + __pu_addr = (long) (ptr); \ + __asm__("":"=r" (__pu_err)); \ + switch (size) { \ + case 1: __put_dbe_asm("sb"); break; \ + case 2: __put_dbe_asm("sh"); break; \ + case 4: __put_dbe_asm("sw"); break; \ + case 8: __put_dbe_asm("sd"); break; \ + default: __put_dbe_unknown(); break; \ + } \ + __pu_err; \ +}) + +#define __put_dbe_asm(insn) \ +{ \ + __asm__ __volatile__( \ + "1:\t" insn "\t%1,%2\n\t" \ + "move\t%0,$0\n" \ + "2:\n\t" \ + ".section\t.fixup,\"ax\"\n" \ + "3:\tli\t%0,%3\n\t" \ + "j\t2b\n\t" \ + ".previous\n\t" \ + ".section\t__dbe_table,\"a\"\n\t" \ + __PA_ADDR "\t1b, 3b\n\t" \ + ".previous" \ + : "=r" (__pu_err) \ + : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \ +} + +extern void __put_dbe_unknown(void); + +extern unsigned long search_dbe_table(unsigned long addr); + +#endif /* _ASM_PACCESS_H */ |