summaryrefslogtreecommitdiff
path: root/arch/arm/boot/compressed/head-sa1100.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/boot/compressed/head-sa1100.S')
-rw-r--r--arch/arm/boot/compressed/head-sa1100.S48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/boot/compressed/head-sa1100.S b/arch/arm/boot/compressed/head-sa1100.S
new file mode 100644
index 00000000000..5aefffd4604
--- /dev/null
+++ b/arch/arm/boot/compressed/head-sa1100.S
@@ -0,0 +1,48 @@
+/*
+ * 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", "ax"
+
+__SA1100_start:
+
+ @ Preserve r8/r7 i.e. kernel entry values
+#ifdef CONFIG_SA1100_COLLIE
+ mov r7, #MACH_TYPE_COLLIE
+#endif
+#ifdef CONFIG_SA1100_SIMPAD
+ @ UNTIL we've something like an open bootldr
+ mov r7, #MACH_TYPE_SIMPAD @should be 87
+#endif
+ mrc p15, 0, r0, c1, c0, 0 @ read control reg
+ ands r0, r0, #0x0d
+ beq 99f
+
+ @ 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
+99: