diff options
Diffstat (limited to 'arch/s390/lib/uaccess_mvcos.c')
| -rw-r--r-- | arch/s390/lib/uaccess_mvcos.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/s390/lib/uaccess_mvcos.c b/arch/s390/lib/uaccess_mvcos.c new file mode 100644 index 000000000000..121b2935a422 --- /dev/null +++ b/arch/s390/lib/uaccess_mvcos.c @@ -0,0 +1,166 @@ +/* + * arch/s390/lib/uaccess_mvcos.c + * + * Optimized user space space access functions based on mvcos. + * + * Copyright (C) IBM Corp. 2006 + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), + * Gerald Schaefer (gerald.schaefer@de.ibm.com) + */ + +#include <linux/errno.h> +#include <linux/mm.h> +#include <asm/uaccess.h> +#include <asm/futex.h> + +#ifndef __s390x__ +#define AHI "ahi" +#define ALR "alr" +#define CLR "clr" +#define LHI "lhi" +#define SLR "slr" +#else +#define AHI "aghi" +#define ALR "algr" +#define CLR "clgr" +#define LHI "lghi" +#define SLR "slgr" +#endif + +size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x) +{ + register unsigned long reg0 asm("0") = 0x81UL; + unsigned long tmp1, tmp2; + + tmp1 = -4096UL; + asm volatile( + "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n" + " jz 7f\n" + "1:"ALR" %0,%3\n" + " "SLR" %1,%3\n" + " "SLR" %2,%3\n" + " j 0b\n" + "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ + " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ + " "SLR" %4,%1\n" + " "CLR" %0,%4\n" /* copy crosses next page boundary? */ + " jnh 4f\n" + "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n" + " "SLR" %0,%4\n" + " "ALR" %2,%4\n" + "4:"LHI" %4,-1\n" + " "ALR" %4,%0\n" /* copy remaining size, subtract 1 */ + " bras %3,6f\n" /* memset loop */ + " xc 0(1,%2),0(%2)\n" + "5: xc 0(256,%2),0(%2)\n" + " la %2,256(%2)\n" + "6:"AHI" %4,-256\n" + " jnm 5b\n" + " ex %4,0(%3)\n" + " j 8f\n" + "7:"SLR" %0,%0\n" + "8: \n" + EX_TABLE(0b,2b) EX_TABLE(3b,4b) + : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) + : "d" (reg0) : "cc", "memory"); + return size; +} + +size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x) +{ + register unsigned long reg0 asm("0") = 0x810000UL; + unsigned long tmp1, tmp2; + + tmp1 = -4096UL; + asm volatile( + "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n" + " jz 4f\n" + "1:"ALR" %0,%3\n" + " "SLR" %1,%3\n" + " "SLR" %2,%3\n" + " j 0b\n" + "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ + " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ + " "SLR" %4,%1\n" + " "CLR" %0,%4\n" /* copy crosses next page boundary? */ + " jnh 5f\n" + "3: .insn ss,0xc80000000000,0(%4,%1),0(%2),0\n" + " "SLR" %0,%4\n" + " j 5f\n" + "4:"SLR" %0,%0\n" + "5: \n" + EX_TABLE(0b,2b) EX_TABLE(3b,5b) + : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) + : "d" (reg0) : "cc", "memory"); + return size; +} + +size_t copy_in_user_mvcos(size_t size, void __user *to, const void __user *from) +{ + register unsigned long reg0 asm("0") = 0x810081UL; + unsigned long tmp1, tmp2; + + tmp1 = -4096UL; + /* FIXME: copy with reduced length. */ + asm volatile( + "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n" + " jz 2f\n" + "1:"ALR" %0,%3\n" + " "SLR" %1,%3\n" + " "SLR" %2,%3\n" + " j 0b\n" + "2:"SLR" %0,%0\n" + "3: \n" + EX_TABLE(0b,3b) + : "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2) + : "d" (reg0) : "cc", "memory"); + return size; +} + +size_t clear_user_mvcos(size_t size, void __user *to) +{ + register unsigned long reg0 asm("0") = 0x810000UL; + unsigned long tmp1, tmp2; + + tmp1 = -4096UL; + asm volatile( + "0: .insn ss,0xc80000000000,0(%0,%1),0(%4),0\n" + " jz 4f\n" + "1:"ALR" %0,%2\n" + " "SLR" %1,%2\n" + " j 0b\n" + "2: la %3,4095(%1)\n"/* %4 = to + 4095 */ + " nr %3,%2\n" /* %4 = (to + 4095) & -4096 */ + " "SLR" %3,%1\n" + " "CLR" %0,%3\n" /* copy crosses next page boundary? */ + " jnh 5f\n" + "3: .insn ss,0xc80000000000,0(%3,%1),0(%4),0\n" + " "SLR" %0,%3\n" + " j 5f\n" + "4:"SLR" %0,%0\n" + "5: \n" + EX_TABLE(0b,2b) EX_TABLE(3b,5b) + : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2) + : "a" (empty_zero_page), "d" (reg0) : "cc", "memory"); + return size; +} + +extern size_t copy_from_user_std_small(size_t, const void __user *, void *); +extern size_t copy_to_user_std_small(size_t, void __user *, const void *); +extern size_t strnlen_user_std(size_t, const char __user *); +extern size_t strncpy_from_user_std(size_t, const char __user *, char *); +extern int futex_atomic_op(int, int __user *, int, int *); +extern int futex_atomic_cmpxchg(int __user *, int, int); + +struct uaccess_ops uaccess_mvcos = { + .copy_from_user = copy_from_user_mvcos, + .copy_from_user_small = copy_from_user_std_small, + .copy_to_user = copy_to_user_mvcos, + .copy_to_user_small = copy_to_user_std_small, + .copy_in_user = copy_in_user_mvcos, + .clear_user = clear_user_mvcos, + .strnlen_user = strnlen_user_std, + .strncpy_from_user = strncpy_from_user_std, + .futex_atomic_op = futex_atomic_op, + .futex_atomic_cmpxchg = futex_atomic_cmpxchg, +}; |