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authorPaul Mackerras <paulus@samba.org>2005-11-16 13:38:21 +1100
committerPaul Mackerras <paulus@samba.org>2005-11-16 13:52:21 +1100
commit94b212c29f685ca54b5689a8e89ac7671c43d651 (patch)
tree356266520a5ba530b2a5b77b68e90e87a2402ecb /arch/powerpc/boot/crt0.S
parent7486a38f683d49e6f8b2b9050ff06778b151a40c (diff)
powerpc: Move ppc64 boot wrapper code over to arch/powerpc
This also extends the code to handle 32-bit ELF vmlinux files as well as 64-bit ones. This is sufficient for booting on new-world 32-bit powermacs (i.e. all recent machines). Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/boot/crt0.S')
-rw-r--r--arch/powerpc/boot/crt0.S59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S
new file mode 100644
index 00000000000..9cc44226393
--- /dev/null
+++ b/arch/powerpc/boot/crt0.S
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * NOTE: this code runs in 32 bit mode and is packaged as ELF32.
+ */
+
+#include "ppc_asm.h"
+
+ .text
+ .globl _zimage_start
+_zimage_start:
+ bl reloc_offset
+
+reloc_offset:
+ mflr r0
+ lis r9,reloc_offset@ha
+ addi r9,r9,reloc_offset@l
+ subf. r0,r9,r0
+ beq clear_caches
+
+reloc_got2:
+ lis r9,__got2_start@ha
+ addi r9,r9,__got2_start@l
+ lis r8,__got2_end@ha
+ addi r8,r8,__got2_end@l
+ subf. r8,r9,r8
+ beq clear_caches
+ srwi. r8,r8,2
+ mtctr r8
+ add r9,r0,r9
+reloc_got2_loop:
+ lwz r8,0(r9)
+ add r8,r8,r0
+ stw r8,0(r9)
+ addi r9,r9,4
+ bdnz reloc_got2_loop
+
+clear_caches:
+ lis r9,_start@h
+ add r9,r0,r9
+ lis r8,_etext@ha
+ addi r8,r8,_etext@l
+ add r8,r0,r8
+1: dcbf r0,r9
+ icbi r0,r9
+ addi r9,r9,0x20
+ cmplwi 0,r9,8
+ blt 1b
+ sync
+ isync
+
+ mr r6,r1
+ b start
+