Changeset add04f7 in mainline for kernel/arch/ia32/src/fpu_context.c

Timestamp:

2009-03-03T15:20:49Z (15 years ago)

Author:

Martin Decky <martin@…>

Branches:

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

Children:

f24d300

Parents:

deca67b

Message:

better inline assembler readability using the new symbolic syntax

File:

• kernel/arch/ia32/src/fpu_context.c (modified) (6 diffs)

kernel/arch/ia32/src/fpu_context.c

@@ -45 +45 @@
 {
         asm volatile (
-                "fnsave %0"
-                : "=m"(*fctx)
-                );
+                "fnsave %[fctx]"
+                : [fctx] "=m" (*fctx)
+        );
 }
 
@@ -53 +53 @@
 {
         asm volatile (
-                "frstor %0"
-                : "=m"(*fctx)
-                );
+                "frstor %[fctx]"
+                : [fctx] "=m" (*fctx)
+        );
 }
 
@@ -61 +61 @@
 {
         asm volatile (
-                "fxsave %0"
-                : "=m"(*fctx)
-                );
+                "fxsave %[fctx]"
+                : [fctx] "=m" (*fctx)
+        );
 }
 
@@ -69 +69 @@
 {
         asm volatile (
-                "fxrstor %0"
-                : "=m"(*fctx)
-                );
+                "fxrstor %[fctx]"
+                : [fctx] "=m" (*fctx)
+        );
 }
 
-/*
-        Setup using fxsr instruction
-*/
+/* Setup using fxsr instruction */
 void fpu_fxsr(void)
 {
@@ -82 +80 @@
         fpu_restore=fpu_context_fx_restore;
 }
-/*
-        Setup using not fxsr instruction
-*/
+
+/* Setup using not fxsr instruction */
 void fpu_fsr(void)
 {
@@ -103 +100 @@
 void fpu_init()
 {
-        uint32_t help0 = 0, help1 = 0;
+        uint32_t help0 = 0;
+        uint32_t help1 = 0;
+        
         asm volatile (
-                "fninit;\n"
-                "stmxcsr %0\n"
-                "mov %0,%1;\n"
-                "or %2,%1;\n"
-                "mov %1,%0;\n"
-                "ldmxcsr %0;\n"
-                : "+m" (help0), "+r" (help1)
-                : "i" (0x1f80)
+                "fninit\n"
+                "stmxcsr %[help0]\n"
+                "mov %[help0], %[help1]\n"
+                "or %[magic], %[help1]\n"
+                "mov %[help1], %[help0]\n"
+                "ldmxcsr %[help0]\n"
+                : [help0] "+m" (help0), [help1] "+r" (help1)
+                : [magic] "i" (0x1f80)
         );
 }