Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6

[pandora-kernel.git] / arch / i386 / lib / usercopy.c

diff --git a/arch/i386/lib/usercopy.c b/arch/i386/lib/usercopy.c
index 6979297..258df6b 100644 (file)
--- a/arch/i386/lib/usercopy.c
+++ b/arch/i386/lib/usercopy.c
@@ -5,7 +5,6 @@
  * Copyright 1997 Andi Kleen <ak@muc.de>
  * Copyright 1997 Linus Torvalds
  */
-#include <linux/config.h>
 #include <linux/mm.h>
 #include <linux/highmem.h>
 #include <linux/blkdev.h>
@@ -180,7 +179,7 @@ __clear_user(void __user *to, unsigned long n)
 EXPORT_SYMBOL(__clear_user);
 
 /**
- * strlen_user: - Get the size of a string in user space.
+ * strnlen_user: - Get the size of a string in user space.
  * @s: The string to measure.
  * @n: The maximum valid length
  *
@@ -528,6 +527,97 @@ static unsigned long __copy_user_zeroing_intel_nocache(void *to,
        return size;
 }
 
+static unsigned long __copy_user_intel_nocache(void *to,
+                               const void __user *from, unsigned long size)
+{
+        int d0, d1;
+
+       __asm__ __volatile__(
+              "        .align 2,0x90\n"
+              "0:      movl 32(%4), %%eax\n"
+              "        cmpl $67, %0\n"
+              "        jbe 2f\n"
+              "1:      movl 64(%4), %%eax\n"
+              "        .align 2,0x90\n"
+              "2:      movl 0(%4), %%eax\n"
+              "21:     movl 4(%4), %%edx\n"
+              "        movnti %%eax, 0(%3)\n"
+              "        movnti %%edx, 4(%3)\n"
+              "3:      movl 8(%4), %%eax\n"
+              "31:     movl 12(%4),%%edx\n"
+              "        movnti %%eax, 8(%3)\n"
+              "        movnti %%edx, 12(%3)\n"
+              "4:      movl 16(%4), %%eax\n"
+              "41:     movl 20(%4), %%edx\n"
+              "        movnti %%eax, 16(%3)\n"
+              "        movnti %%edx, 20(%3)\n"
+              "10:     movl 24(%4), %%eax\n"
+              "51:     movl 28(%4), %%edx\n"
+              "        movnti %%eax, 24(%3)\n"
+              "        movnti %%edx, 28(%3)\n"
+              "11:     movl 32(%4), %%eax\n"
+              "61:     movl 36(%4), %%edx\n"
+              "        movnti %%eax, 32(%3)\n"
+              "        movnti %%edx, 36(%3)\n"
+              "12:     movl 40(%4), %%eax\n"
+              "71:     movl 44(%4), %%edx\n"
+              "        movnti %%eax, 40(%3)\n"
+              "        movnti %%edx, 44(%3)\n"
+              "13:     movl 48(%4), %%eax\n"
+              "81:     movl 52(%4), %%edx\n"
+              "        movnti %%eax, 48(%3)\n"
+              "        movnti %%edx, 52(%3)\n"
+              "14:     movl 56(%4), %%eax\n"
+              "91:     movl 60(%4), %%edx\n"
+              "        movnti %%eax, 56(%3)\n"
+              "        movnti %%edx, 60(%3)\n"
+              "        addl $-64, %0\n"
+              "        addl $64, %4\n"
+              "        addl $64, %3\n"
+              "        cmpl $63, %0\n"
+              "        ja  0b\n"
+              "        sfence \n"
+              "5:      movl  %0, %%eax\n"
+              "        shrl  $2, %0\n"
+              "        andl $3, %%eax\n"
+              "        cld\n"
+              "6:      rep; movsl\n"
+              "        movl %%eax,%0\n"
+              "7:      rep; movsb\n"
+              "8:\n"
+              ".section .fixup,\"ax\"\n"
+              "9:      lea 0(%%eax,%0,4),%0\n"
+              "16:     jmp 8b\n"
+              ".previous\n"
+              ".section __ex_table,\"a\"\n"
+              "        .align 4\n"
+              "        .long 0b,16b\n"
+              "        .long 1b,16b\n"
+              "        .long 2b,16b\n"
+              "        .long 21b,16b\n"
+              "        .long 3b,16b\n"
+              "        .long 31b,16b\n"
+              "        .long 4b,16b\n"
+              "        .long 41b,16b\n"
+              "        .long 10b,16b\n"
+              "        .long 51b,16b\n"
+              "        .long 11b,16b\n"
+              "        .long 61b,16b\n"
+              "        .long 12b,16b\n"
+              "        .long 71b,16b\n"
+              "        .long 13b,16b\n"
+              "        .long 81b,16b\n"
+              "        .long 14b,16b\n"
+              "        .long 91b,16b\n"
+              "        .long 6b,9b\n"
+              "        .long 7b,16b\n"
+              ".previous"
+              : "=&c"(size), "=&D" (d0), "=&S" (d1)
+              :  "1"(to), "2"(from), "0"(size)
+              : "eax", "edx", "memory");
+       return size;
+}
+
 #else
 
 /*
@@ -649,7 +739,7 @@ survive:
                        retval = get_user_pages(current, current->mm,
                                        (unsigned long )to, 1, 1, 0, &pg, NULL);
 
-                       if (retval == -ENOMEM && current->pid == 1) {
+                       if (retval == -ENOMEM && is_init(current)) {
                                up_read(&current->mm->mmap_sem);
                                blk_congestion_wait(WRITE, HZ/50);
                                goto survive;
@@ -694,6 +784,19 @@ unsigned long __copy_from_user_ll(void *to, const void __user *from,
 }
 EXPORT_SYMBOL(__copy_from_user_ll);
 
+unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from,
+                                        unsigned long n)
+{
+       BUG_ON((long)n < 0);
+       if (movsl_is_ok(to, from, n))
+               __copy_user(to, from, n);
+       else
+               n = __copy_user_intel((void __user *)to,
+                                     (const void *)from, n);
+       return n;
+}
+EXPORT_SYMBOL(__copy_from_user_ll_nozero);
+
 unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
                                        unsigned long n)
 {
@@ -709,6 +812,21 @@ unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
        return n;
 }
 
+unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
+                                       unsigned long n)
+{
+       BUG_ON((long)n < 0);
+#ifdef CONFIG_X86_INTEL_USERCOPY
+       if ( n > 64 && cpu_has_xmm2)
+                n = __copy_user_intel_nocache(to, from, n);
+       else
+               __copy_user(to, from, n);
+#else
+        __copy_user(to, from, n);
+#endif
+       return n;
+}
+
 /**
  * copy_to_user: - Copy a block of data into user space.
  * @to:   Destination address, in user space.
@@ -725,7 +843,6 @@ unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
 unsigned long
 copy_to_user(void __user *to, const void *from, unsigned long n)
 {
-       might_sleep();
        BUG_ON((long) n < 0);
        if (access_ok(VERIFY_WRITE, to, n))
                n = __copy_to_user(to, from, n);
@@ -752,7 +869,6 @@ EXPORT_SYMBOL(copy_to_user);
 unsigned long
 copy_from_user(void *to, const void __user *from, unsigned long n)
 {
-       might_sleep();
        BUG_ON((long) n < 0);
        if (access_ok(VERIFY_READ, from, n))
                n = __copy_from_user(to, from, n);