Changeset aa4e8d7 in mainline

Timestamp:

2005-05-08T13:59:59Z (20 years ago)

Author:

Jakub Vana <jakub.vana@…>

Branches:

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

Children:

be50915

Parents:

e9b9e12

Message:

Remove fpu_context pointer from context_t.
Add fpu_context statically to thread_t.
Two functions for saving and restoring FPU context on lazy switch.

Files:

• arch/ia32/include/context.h (modified) (1 diff)
• arch/ia32/src/context.s (modified) (2 diffs)
• include/proc/thread.h (modified) (1 diff)
• src/Makefile.config (modified) (1 diff)
• src/main/main.c (modified) (2 diffs)

arch/ia32/include/context.h

@@ -47 +47 @@
         __u32 ebp;
         __u32 pri;
-        struct fpu_context *fpu;        
 } __attribute__ ((packed));
 

arch/ia32/src/context.s

@@ -31 +31 @@
 .global context_save
 .global context_restore
+
 
 #
@@ -74 +75 @@
         xorl %eax,%eax          # context_restore returns 0
         ret
+
+
+.global fpu_context_save
+fpu_context_save:
+    ret
+.global fpu_context_restore
+fpu_context_restore:
+    ret
+
+.global fpu_lazy_context_save
+    mov 4(%esp),%eax;
+    fxsave (%eax)
+    xor %eax,%eax;
+    ret;
+.global fpu_lazy_context_restore
+    mov 4(%esp),%eax;
+    fxrstor (%eax)
+    xor %eax,%eax;
+    ret;
+

include/proc/thread.h

@@ -73 +73 @@
         context_t saved_context;
         context_t sleep_timeout_context;
-
+        fpu_context_t saved_fpu;                       
+        
+        
         waitq_t *sleep_queue;
         timeout_t sleep_timeout;

src/Makefile.config

@@ -1 @@
-#ARCH=ia32
+ARCH=ia32
 #ARCH=mips
-ARCH=ia64
+#ARCH=ia64
 #ARCH=powerpc
 #ARCH=amd64

src/main/main.c

@@ -92 +92 @@
         config.kernel_size = hardcoded_ktext_size + hardcoded_kdata_size + CONFIG_HEAP_SIZE + CONFIG_STACK_SIZE;
 
-        context_save(&ctx);
+        context_save(&ctx); /* There is no nead to save FPU context */
         ctx.sp = config.base + config.kernel_size - 8;
         ctx.pc = (__address) main_bsp_separated_stack;
-        context_restore(&ctx);
+        context_restore(&ctx); /* There is no nead to load FPU context */
         /* not reached */
 }
@@ -193 +193 @@
         CPU->saved_context.sp = (__address) &CPU->stack[CPU_STACK_SIZE-8];
         CPU->saved_context.pc = (__address) main_ap_separated_stack;
-        context_restore(&CPU->saved_context);
+        context_restore(&CPU->saved_context); /* There is no nead to load FPU context */
         /* not reached */
 }