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-rw-r--r--arch/arm/boot/compressed/head-sa1100.S45
1 files changed, 45 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 0000000000..23eae1a650
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+++ b/arch/arm/boot/compressed/head-sa1100.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/arch/arm/boot/compressed/head-sa1100.S
+ *
+ * Copyright (C) 1999 Nicolas Pitre <nico@fluxnic.net>
+ *
+ * SA1100 specific tweaks. This is merged into head.S by the linker.
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/mach-types.h>
+
+ .section ".start", "ax"
+ .arch armv4
+
+__SA1100_start:
+
+ @ Preserve r8/r7 i.e. kernel entry values
+#ifdef CONFIG_SA1100_COLLIE
+ mov r7, #MACH_TYPE_COLLIE
+#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: