Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 81 insertions, 0 deletions

diff --git a/arch/ppc/boot/common/crt0.S b/arch/ppc/boot/common/crt0.S
new file mode 100644
index 000000000000..4d31b824bbd1
--- /dev/null
+++ b/arch/ppc/boot/common/crt0.S
@@ -0,0 +1,81 @@
+/*    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 <linux/config.h>
+#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.