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Diffstat (limited to 'arch/ppc/boot/common/crt0.S')
| -rw-r--r-- | arch/ppc/boot/common/crt0.S | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/arch/ppc/boot/common/crt0.S b/arch/ppc/boot/common/crt0.S deleted file mode 100644 index 8f0ef04..0000000 --- a/arch/ppc/boot/common/crt0.S +++ /dev/null @@ -1,80 +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 <asm/ppc_asm.h> - - .text - - .globl _start -_start: -#ifdef XCOFF - .long __start,0,0 - - .globl __start -__start: -#endif - - ## Flush and invalidate the caches for the range in memory covering - ## the .text section of the boot loader - - 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 - cmplw cr0,r9,r8 # Are we at the end yet? - blt 3b # No, keep flushing and invalidating - sync # sync ; isync after flushing the icache - isync - - ## 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 -2: - -#ifdef CONFIG_40x - ## Set up the stack - - lis r9,_start@h # r9 = &_start (text section entry) - ori 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 -#endif - - b start # All done, start the real work. |