Changeset 1ea99cc in mainline for kernel/arch/ia32/include/barrier.h

Timestamp:

2009-08-20T20:47:35Z (15 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

b50b5af2

Parents:

24edc18

Message:

Merge changes from original Subversion dynload branch.

File:

• kernel/arch/ia32/include/barrier.h (modified) (2 diffs)

kernel/arch/ia32/include/barrier.h

@@ -52 +52 @@
 static inline void cpuid_serialization(void)
 {
+#ifndef __IN_SHARED_LIBC__
         asm volatile (
                 "xorl %%eax, %%eax\n"
@@ -57 +58 @@
                 ::: "eax", "ebx", "ecx", "edx", "memory"
         );
+#else
+        /* Must not clobber PIC register ebx */
+        asm volatile (
+                "movl %%ebx, %%esi\n"
+                "xorl %%eax, %%eax\n"
+                "cpuid\n"
+                "movl %%esi, %%ebx\n"
+                ::: "eax", "ecx", "edx", "esi", "memory"
+        );
+#endif
 }