Return to head-xscale.S CVS log

Up to [Development] / linux-2.6-xfs / arch / arm / boot / compressed

Initial Import 2.6.0

/*
 * linux/arch/arm/boot/compressed/head-xscale.S
 *
 * XScale 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", "ax"

__XScale_start:

		@ Preserve r8/r7 i.e. kernel entry values

		@ 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, #0x10000	@ 64 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, #0x05		@ clear DC, MMU
		bic	r0, r0, #0x1000		@ clear Icache
		mcr	p15, 0, r0, c1, c0, 0

#ifdef	CONFIG_ARCH_IQ80321
		orr	pc, pc, #PHYS_OFFSET	@ jump to physical memory if we are not there.
		nop
		mov	r7, #MACH_TYPE_IQ80321
#endif

#ifdef CONFIG_ARCH_LUBBOCK
		mov	r7, #MACH_TYPE_LUBBOCK
#endif

#ifdef CONFIG_ARCH_COTULLA_IDP
		mov	r7, #MACH_TYPE_COTULLA_IDP
#endif

#ifdef CONFIG_ARCH_IQ80310
		/*
		 * Crank the CPU up to 733MHz
		 */
		mov	r1, #9
		mcr	p14, 0, r1, c6, c0, 0

		/*
		 * Disable ECC error notification
		 * At some point, we should add an ECC handler to Linux
		 */
		mov	r1, #0x1500
		mov	r0, #0x4
		str	r0, [r1, #0x34]

		mov	r7, #MACH_TYPE_IQ80310
#endif

#ifdef CONFIG_ARCH_ADI_EVB
		mov	r7, #MACH_TYPE_ADI_EVB
#endif