Changeset 1b43a04 in mainline for boot/arch/sparc64/loader/boot.S

Timestamp:

2006-11-05T13:49:23Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

b63a7cc

Parents:

14de0dd8

Message:

Modify selected function to consume less stack space.

Avoid flushw instruction in the sparc64 loader.

File:

• boot/arch/sparc64/loader/boot.S (modified) (2 diffs)

boot/arch/sparc64/loader/boot.S

@@ -31 +31 @@
 #include <register.h>
 
-#define INITIAL_STACK_SIZE      1024
+#define INITIAL_STACK_SIZE      8192
+
+#define NWINDOWS                8
 
 .register %g2, #scratch
@@ -55 +57 @@
 .align 8
 1:      
-        flushw
-
         /*
          * Disable interrupts and disable address masking.
          */
         wrpr %g0, PSTATE_PRIV_BIT, %pstate
+        
+        wrpr %g0, NWINDOWS - 2, %cansave        ! set maximum saveable windows
+        wrpr %g0, 0, %canrestore                ! get rid of windows we will never need again
+        wrpr %g0, 0, %otherwin                  ! make sure the window state is consistent
+        wrpr %g0, NWINDOWS - 1, %cleanwin       ! prevent needless clean_window traps for kernel
 
         set initial_stack_top, %sp