Changeset 79f1f38f in mainline

Timestamp:

2005-05-09T00:35:09Z (20 years ago)

Author:

Jakub Vana <jakub.vana@…>

Branches:

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

Children:

9db5b66

Parents:

9c926f3

Message:

Functions for switching TS flag.

Location:

arch/ia32

Files:

• include/cpu.h (modified) (2 diffs)
• src/cpu/cpu.c (modified) (1 diff)
• src/fpu_context.c (modified) (2 diffs)

arch/ia32/include/cpu.h

@@ -31 +31 @@
 
 #include <config.h>
+#include <proc/thread.h>
 #include <typedefs.h>
 #include <arch/pm.h>
@@ -47 +48 @@
         int stepping;
         struct tss *tss;
+        thread_t *fpu_owner;
 };
 
 
+void set_TS_flag(void);
+void reset_TS_flag(void);
+
 #endif

arch/ia32/src/cpu/cpu.c

@@ -62 +62 @@
 };
 
+void set_TS_flag(void)
+{
+        asm
+        (
+                "mov %%cr0,%%eax;"
+                "or $8,%%eax;"
+                "mov %%eax,%%cr0;"
+                :
+                :
+                :"%eax"
+        );
+}
+
+void reset_TS_flag(void)
+{
+        asm
+        (
+                "mov %%cr0,%%eax;"
+                "and $0xffFFffF7,%%eax;"
+                "mov %%eax,%%cr0;"
+                :
+                :
+                :"%eax"
+        );      
+}
+
+
+
 void cpu_arch_init(void)
 {
         CPU->arch.tss = tss_p;
+        CPU->arch.fpu_owner=NULL;
 }
 

arch/ia32/src/fpu_context.c

@@ -30 +30 @@
 
 #include <fpu_context.h>
+#include <arch.h>
+#include <cpu.h>
+
 
 void fpu_context_save(fpu_context_t *fctx)
@@ -38 +41 @@
 void fpu_context_restore(fpu_context_t *fctx)
 {
+        if(THREAD==CPU->arch.fpu_owner) reset_TS_flag();
+        else set_TS_flag();
 }