[PATCH] x86: cache pollution aware __copy_from_user_ll()
[linux-2.6.git] / arch / i386 / lib / usercopy.c
index 4cf981d..6979297 100644 (file)
@@ -425,15 +425,121 @@ __copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size)
                       : "eax", "edx", "memory");
        return size;
 }
+
+/*
+ * Non Temporal Hint version of __copy_user_zeroing_intel.  It is cache aware.
+ * hyoshiok@miraclelinux.com
+ */
+
+static unsigned long __copy_user_zeroing_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:     pushl %0\n"
+              "        pushl %%eax\n"
+              "        xorl %%eax,%%eax\n"
+              "        rep; stosb\n"
+              "        popl %%eax\n"
+              "        popl %0\n"
+              "        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
+
 /*
  * Leave these declared but undefined.  They should not be any references to
  * them
  */
-unsigned long
-__copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size);
-unsigned long
-__copy_user_intel(void __user *to, const void *from, unsigned long size);
+unsigned long __copy_user_zeroing_intel(void *to, const void __user *from,
+                                       unsigned long size);
+unsigned long __copy_user_intel(void __user *to, const void *from,
+                                       unsigned long size);
+unsigned long __copy_user_zeroing_intel_nocache(void *to,
+                               const void __user *from, unsigned long size);
 #endif /* CONFIG_X86_INTEL_USERCOPY */
 
 /* Generic arbitrary sized copy.  */
@@ -515,8 +621,8 @@ do {                                                                        \
                : "memory");                                            \
 } while (0)
 
-
-unsigned long __copy_to_user_ll(void __user *to, const void *from, unsigned long n)
+unsigned long __copy_to_user_ll(void __user *to, const void *from,
+                               unsigned long n)
 {
        BUG_ON((long) n < 0);
 #ifndef CONFIG_X86_WP_WORKS_OK
@@ -576,8 +682,8 @@ survive:
 }
 EXPORT_SYMBOL(__copy_to_user_ll);
 
-unsigned long
-__copy_from_user_ll(void *to, const void __user *from, unsigned long n)
+unsigned long __copy_from_user_ll(void *to, const void __user *from,
+                                       unsigned long n)
 {
        BUG_ON((long)n < 0);
        if (movsl_is_ok(to, from, n))
@@ -588,6 +694,21 @@ __copy_from_user_ll(void *to, const void __user *from, unsigned long n)
 }
 EXPORT_SYMBOL(__copy_from_user_ll);
 
+unsigned long __copy_from_user_ll_nocache(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_zeroing_intel_nocache(to, from, n);
+       else
+               __copy_user_zeroing(to, from, n);
+#else
+        __copy_user_zeroing(to, from, n);
+#endif
+       return n;
+}
+
 /**
  * copy_to_user: - Copy a block of data into user space.
  * @to:   Destination address, in user space.