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head-sa1100.S
Package: linux-2.4.20.tar.gz [view]
Upload User: jlfgdled
Upload Date: 2013-04-10
Package Size: 33168k
Code Size: 2k
Category:
Linux-Unix program
Development Platform:
Unix_Linux
- /*
- * linux/arch/arm/boot/compressed/head-sa1100.S
- *
- * Copyright (C) 1999 Nicolas Pitre <nico@cam.org>
- *
- * SA1100 specific tweaks. This is merged into head.S by the linker.
- *
- */
- #include <linux/config.h>
- #include <linux/linkage.h>
- #include <asm/mach-types.h>
- .section ".start", #alloc, #execinstr
- __SA1100_start:
- @ Preserve r8/r7 i.e. kernel entry values
- #if defined(CONFIG_SA1100_GRAPHICSCLIENT) && !defined(CONFIG_ANGELBOOT)
- mov r7, #MACH_TYPE_GRAPHICSCLIENT
- mov r8, #0
- #endif
- #if defined(CONFIG_SA1100_GRAPHICSMASTER) && !defined(CONFIG_ANGELBOOT)
- mov r7, #MACH_TYPE_GRAPHICSMASTER
- mov r8, #0
- #endif
- #if defined(CONFIG_SA1100_ADSBITSY) && !defined(CONFIG_ANGELBOOT)
- mov r7, #MACH_TYPE_ADSBITSY
- mov r8, #0
- #endif
- #ifdef CONFIG_SA1100_PFS168
- @ REVISIT_PFS168: Temporary until firmware updated to use assigned machine number
- mov r7, #MACH_TYPE_PFS168
- #endif
- #ifdef CONFIG_SA1100_VICTOR
- teq r7, #MACH_TYPE_VICTOR
- bne 10f
- @ Copy cmdline to 0xc0000000
- mov r1, #0xc0000000
- cmp r0, #0
- moveq r2, #0
- 1: ldrneb r2, [r0], #1
- cmpne r2, #0
- strb r2, [r1], #1
- bne 1b
- 10:
- #endif
- @ Data cache might be active.
- @ Be sure to flush kernel binary out of the cache,
- @ whatever state it is, before it is turned off.
- @ This is done by fetching through currently executed
- @ memory to be sure we hit the same cache.
- bic r2, pc, #0x1f
- add r3, r2, #0x4000 @ 16 kb is quite enough...
- 1: ldr r0, [r2], #32
- teq r2, r3
- bne 1b
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches
- @ disabling MMU and caches
- mrc p15, 0, r0, c1, c0, 0 @ read control reg
- bic r0, r0, #0x0d @ clear WB, DC, MMU
- bic r0, r0, #0x1000 @ clear Icache
- mcr p15, 0, r0, c1, c0, 0
- /*
- * Pause for a short time so that we give enough time
- * for the host to start a terminal up.
- */
- mov r0, #0x00200000
- 1: subs r0, r0, #1
- bne 1b