42 lines
992 B
ArmAsm
42 lines
992 B
ArmAsm
/*
|
|
* linux/arch/arm/boot/compressed/head-xscale.S
|
|
*
|
|
* XScale specific tweaks. This is merged into head.S by the linker.
|
|
*
|
|
*/
|
|
|
|
#include <linux/linkage.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_IXP2000
|
|
mov r1, #-1
|
|
mov r0, #0xd6000000
|
|
str r1, [r0, #0x14]
|
|
str r1, [r0, #0x18]
|
|
#endif
|
|
|