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author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-22 23:50:35 +0400 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-22 23:50:35 +0400 |
commit | a489d159229fcc07bbb7566ac4fac745b79197ad (patch) | |
tree | ea7bcf20e845de8a96ccc1549799ac073fb28a84 /arch/s390/lib/uaccess_mvcos.c | |
parent | a48178a2fa17beee17d7e6aeaa6ed2db5813552d (diff) | |
parent | 388c571cffc4ae4e64f0786333e811308acbbc10 (diff) | |
download | linux-a489d159229fcc07bbb7566ac4fac745b79197ad.tar.xz |
Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: (44 commits)
[S390] hypfs crashes with invalid mount option.
[S390] cio: subchannel evaluation function operates without lock
[S390] cio: always query all paths on path verification.
[S390] cio: update path groups on logical CHPID changes.
[S390] cio: subchannels in no-path state.
[S390] Replace nopav-message on VM.
[S390] set modalias for ccw bus uevents.
[S390] Get rid of DBG macro.
[S390] Use alternative user-copy operations for new hardware.
[S390] Make user-copy operations run-time configurable.
[S390] Cleanup in signal handling code.
[S390] Cleanup in page table related code.
[S390] Linux API for writing z/VM APPLDATA Monitor records.
[S390] xpram off by one error.
[S390] Remove kexec experimental flag.
[S390] cleanup appldata.
[S390] fix typo in vmcp.
[S390] Kernel stack overflow handling.
[S390] qdio slsb processing state.
[S390] Missing initialization in common i/o layer.
...
Diffstat (limited to 'arch/s390/lib/uaccess_mvcos.c')
-rw-r--r-- | arch/s390/lib/uaccess_mvcos.c | 156 |
1 files changed, 156 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..86c96d6c191a --- /dev/null +++ b/arch/s390/lib/uaccess_mvcos.c @@ -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, +}; |