Changeset 0e4dd7b in mainline for arch/sparc64/src/start.S

Timestamp:

2006-02-17T16:49:52Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

c1e43e4

Parents:

37c8975

Message:

sparc64 work.
Relocate kernel to 4M.

File:

• arch/sparc64/src/start.S (modified) (2 diffs)

arch/sparc64/src/start.S

@@ -27 +27 @@
 #
 
+#include <arch/boot/boot.h>
+
 .register %g2, #scratch
 .register %g3, #scratch
@@ -51 +53 @@
 
 1:
+        flushw                          ! flush all but the active register window
+
+        /*
+         * Prepare to copy the kernel image to 4M.
+         */
+
+        set LMA, %g1                    ! source address
+        set VMA, %g2                    ! destination address (VMA)
+        set hardcoded_ktext_size, %g3   ! link address of hardcoded_ktext_size
+        set hardcoded_kdata_size, %g4   ! link address of hardcoded_kdata_size
+
+        sub %g3, %g2, %g3               ! offset of hardcoded_ktext_size from the beginning of the load address
+        sub %g4, %g2, %g4               ! offset of hardcoded_kdata_size from the beginning of the load address
+        
+        ldx [%g3 + %g1], %g3            ! hardcoded_ktext_size -> %g3
+        ldx [%g4 + %g1], %g4            ! hardcoded_kdata_size -> %g4
+
+        add %g3, %g4, %g3               ! size of kernel text and data
+
+        /*
+         * Start copying the kernel from higher addresses towards lower addresses.
+         */
+
+2:      dec %g3
+        ldub [%g1 + %g3], %g4
+        stb %g4, [%g2 + %g3]
+        cmp %g3, 0
+        bnz 2b
+        nop
+
+        set relocated, %g1
+        jmp %g1
+        nop
+
+relocated:
         set ofw, %l0