[S390] Use alternative user-copy operations for new hardware.
This introduces new user-copy operations which are optimized for copying more than 256 Bytes on new hardware. Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer
committed by
Martin Schwidefsky
Martin Schwidefsky
parent
d02765d1af
commit
6c2a9e6df6
156
arch/s390/lib/uaccess_mvcos.c
Normal file
156
arch/s390/lib/uaccess_mvcos.c
Normal file
@@ -0,0 +1,156 @@
|
||||
/*
|
||||
* 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 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,%2),0(%1),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_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,
|
||||
};
|
||||
Reference in New Issue
Block a user