Diffstat (limited to 'arch/arm/boot/compressed/head-xscale.S')
1 files changed, 49 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
@@ -0,0 +1,49 @@
+ * linux/arch/arm/boot/compressed/head-xscale.S
+ * XScale specific tweaks. This is merged into head.S by the linker.
+ .section ".start", "ax"
+ @ 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
+ mov r7, #MACH_TYPE_LUBBOCK
+ mov r7, #MACH_TYPE_COTULLA_IDP
+ mov r7, #(MACH_TYPE_GTWX5715 & 0xff)
+ orr r7, r7, #(MACH_TYPE_GTWX5715 & 0xff00)