patch-2.4.5 linux/arch/ppc/treeboot/crt0.S

• Lines: 71
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.4/linux/arch/ppc/treeboot/crt0.S
• Orig date: Mon Jan 10 18:25:32 2000

diff -u --recursive --new-file v2.4.4/linux/arch/ppc/treeboot/crt0.S linux/arch/ppc/treeboot/crt0.S
@@ -1,70 +0,0 @@
-/*
- *    Copyright (c) 1997 Paul Mackerras <paulus@cs.anu.edu.au>
- *      Initial Power Macintosh COFF version.
- *    Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
- *      Modifications for IBM PowerPC 400-class processor evaluation
- *      boards.
- *
- *    Module name: crt0.S
- *
- *    Description:
- *      Boot loader execution entry point. Clears out .bss section as per
- *      ANSI C requirements. Invalidates and flushes the caches over the
- *      range covered by the boot loader's .text section. Sets up a stack
- *      below the .text section entry point.
- *
- *    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.
- *
- */
-
-#include "../kernel/ppc_asm.tmpl"
-
-	.text
-
-	.globl	_start
-_start:	
-        ## Clear out the BSS as per ANSI C requirements
-
-        lis     r7,_end@ha		# 
-        addi    r7,r7,_end@l		# r7 = &_end
-        lis     r8,__bss_start@ha	# 
-        addi    r8,r8,__bss_start@l	# r8 = &_bss_start
-
-	## Determine how large an area, in number of words, to clear
-	
-        subf    r7,r8,r7		# r7 = &_end - &_bss_start + 1 
-        addi    r7,r7,3			# r7 += 3
-        srwi.   r7,r7,2			# r7 = size in words.
-        beq     2f			# If the size is zero, do not bother
-        addi    r8,r8,-4		# r8 -= 4
-        mtctr   r7			# SPRN_CTR = number of words to clear
-        li      r0,0			# r0 = 0
-1:      stwu    r0,4(r8)		# Clear out a word
-        bdnz    1b			# If we are not done yet, keep clearing
-	
-	## Flush and invalidate the caches for the range in memory covering
-	## the .text section of the boot loader
-	
-2:	lis	r9,_start@h		# r9 = &_start
-	lis	r8,_etext@ha		# 
-	addi	r8,r8,_etext@l		# r8 = &_etext
-3:	dcbf	r0,r9			# Flush the data cache
-	icbi	r0,r9			# Invalidate the instruction cache
-	addi	r9,r9,0x10		# Increment by one cache line
-	cmplwi	cr0,r9,r8		# Are we at the end yet?
-	blt	3b			# No, keep flushing and invalidating
-
-	## Set up the stack
-
-	lis	r9,_start@h		# r9 = &_start (text section entry)
-	addi	r9,r9,_start@l
-	subi	r1,r9,64		# Start the stack 64 bytes below _start
-	clrrwi	r1,r1,4			# Make sure it is aligned on 16 bytes.
-	li	r0,0
-	stwu	r0,-16(r1)
-	mtlr	r9
-	
-	b	start			# All done, start the real work.