diff options
Diffstat (limited to 'arch/arm/boot/compressed/head-xscale.S')
| -rw-r--r-- | arch/arm/boot/compressed/head-xscale.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/boot/compressed/head-xscale.S b/arch/arm/boot/compressed/head-xscale.S new file mode 100644 index 000000000..20fa44d59 --- /dev/null +++ b/arch/arm/boot/compressed/head-xscale.S @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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 + |