patch-2.1.16 linux/arch/sparc/boot/bare.S

• Lines: 161
• Date: Thu Jan 1 02:00:00 1970
• Orig file: v2.1.15/linux/arch/sparc/boot/bare.S
• Orig date: Thu Apr 25 13:22:05 1996

diff -u --recursive --new-file v2.1.15/linux/arch/sparc/boot/bare.S linux/arch/sparc/boot/bare.S
@@ -1,160 +0,0 @@
-/* $Id: bare.S,v 1.4 1996/04/23 01:53:40 davem Exp $
- * base.S:      Ugly low-level boot program entry code.  The job of this
- *              module is to parse the boot flags, try to mount the remote
- *              root filesystem and load the kernel into virtual memory.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- */
-
-#include "bare.h"
-#include <asm/ptrace.h>
-
-	.data
-	.globl C_LABEL(romvec)
-	.globl C_LABEL(idp_ptr)
-
-C_LABEL(romvec):
-	.word 0
-C_LABEL(idp_ptr):
-	.word 0
-
-	.text
-	.align 8
-	.globl C_LABEL(first_adr_in_text)
-
-C_LABEL(first_adr_in_text):
-
-	/* Grrr, boot block, scratching my head... */
-	.globl C_LABEL(b_block)       /* Start of actual boot block */
-	.globl C_LABEL(b_block_size)  /* In bytes */
-	.globl C_LABEL(b_block_cksum) /* Checksum of boot block bytes */
-
-	b	start_of_execution    /* XXX Hack */
-	nop
-
-	.align	8
-C_LABEL(b_block):	
-	.skip	(BOOTBLOCK_NENTRIES * BOOTBLOCK_ENTSIZE)
-
-C_LABEL(b_block_size):
-	.word	0
-
-C_LABEL(b_block_cksum):
-	.word	0
-
-/* Ok, the prom has left in %o0 the PROM pointer.  We leave it here
- * for when we jump into the kernel.  So save out of this window before
- * you dick with %o0.  As far as I know we could be loaded *anywhere*, so
- * we relocate ourselves to the "linked" location.  Self modifying code rules.
- */
-
-start_of_execution:
-	sethi	%hi(C_LABEL(first_adr_in_text)), %o1		! This is our top
-	or	%o1, %lo(C_LABEL(first_adr_in_text)), %o1	! of stack too.
-	sub	%o1, REGWIN_SZ, %o1
-	add	%o1, 0x7, %o1
-	andn	%o1, 0x7, %o1
-	save	%o1, 0x0, %sp					! save is an add
-here:
-	call	there
-	sethi	%hi(here), %o4
-there:	
-	sub	%o7, here-C_LABEL(first_adr_in_text), %o5
-	or	%o4, %lo(here), %o4
-	cmp	%o4, %o7
-	be	loaded_ok
-	nop
-
-	/* Gotta relocate, compute our size sans bss segment. */
-	set	C_LABEL(edata)+4, %o3
-	set	C_LABEL(first_adr_in_text), %o2
-	sub	%o3, %o2, %o3
-rel_loop:
-	ld	[%o5], %o4
-	add	%o5, 0x4, %o5
-	st	%o4, [%o2]
-	subcc	%o3, 0x4, %o3
-	bg	rel_loop
-	add	%o2, 0x4, %o2
-
-	/* Pray that we are now in a sane place in memory */
-	sethi	%hi(loaded_ok), %o2
-	or	%o2, %lo(loaded_ok), %o2
-	jmp	%o2
-	nop
-
-loaded_ok:
-	/* Save the PROM pointer */
-	sethi	%hi(C_LABEL(romvec)), %o1
-	or	%o1, %lo(C_LABEL(romvec)), %o1
-	st	%i0, [%o1]
-
-	/* Build a PSR we can live with */
-	rd	%psr, %o1
-
-#if 0
-	andn	%o1, PSR_PIL, %o1
-	sethi	%hi(SANE_PSR), %g4
-	or	%g4, %lo(SANE_PSR), %g4
-	or	%o1, %g4, %o1
-#endif
-
-	/* V8 book says this works to calculate num_windows */
-	sethi	%hi(0xffffffff), %g2
-	rd	%wim, %g3
-	or	%g2, %lo(0xffffffff), %g2
-	wr	%g2, 0x0, %wim
-	WRITE_PAUSE
-
-	rd	%wim, %g4
-	WRITE_PAUSE
-
-	wr	%g3, 0x0, %wim
-	WRITE_PAUSE
-
-	/* Restore old %psr */
-	wr	%o1, 0x0, %psr
-	WRITE_PAUSE
-
-	or	%g0, 0x0, %g3
-1:
-	srl	%g4, 0x1, %g4
-	subcc	%g4, 0x0, %g0
-	bne	1b
-	add	%g3, 0x1, %g3
-	
-	/* %g3 now contains nwindows */
-	sethi	%hi(C_LABEL(nwindows)), %o4
-	st	%g3, [%o4 + %lo(C_LABEL(nwindows))]
-
-	/* Now zero out our bss segment, lord knows the nasty prom monster
-	 * didn't do it for us.
-	 */
-	sethi	%hi(C_LABEL(end)), %g1
-	or	%g1, %lo(C_LABEL(end)), %g1
-	add	%g1, 0x4, %g1
-	sethi	%hi(C_LABEL(edata)), %g2
-	or	%g2, %lo(C_LABEL(edata)), %g2
-
-	/* Slow, inefficient, who cares, this is messy boot code */
-bzero_bss_loop:
-	st	%g0, [%g2]
-	add	%g2, 0x4, %g2
-	cmp	%g2, %g1
-	bl	bzero_bss_loop
-	nop
-
-	call	C_LABEL(init_me)	! Fun with empirical constants and prom
-	nop
-
-	/* Dump back into the prom */
-get_me_out_of_here:
-	set	C_LABEL(romvec), %g2
-	ld	[%g2], %g2
-	ld	[%g2 + 0x74], %g2
-	restore
-	call	%g2
-	nop
-
-
-