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-rw-r--r--arch/arm/mach-pxa/mioa701_bootresume.S38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/mioa701_bootresume.S b/arch/arm/mach-pxa/mioa701_bootresume.S
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Bootloader to resume MIO A701
+ *
+ * 2007-1-12 Robert Jarzmik
+*/
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Note: Yes, part of the following code is located into the .data section.
+ * This is to allow jumpaddr to be accessed with a relative load
+ * while we can't rely on any MMU translation. We could have put
+ * sleep_save_sp in the .text section as well, but some setups might
+ * insist on it to be truly read-only.
+ */
+ .data
+ .align 2
+ENTRY(mioa701_bootstrap)
+0:
+ b 1f
+ENTRY(mioa701_jumpaddr)
+ .word 0x40f00008 @ PSPR in no-MMU mode
+1:
+ mov r0, #0xa0000000 @ Don't suppose memory access works
+ orr r0, r0, #0x00200000 @ even if it's supposed to
+ orr r0, r0, #0x0000b000
+ mov r1, #0
+ str r1, [r0] @ Early disable resume for next boot
+ ldr r0, mioa701_jumpaddr @ (Murphy's Law)
+ ldr r0, [r0]
+ ret r0
+2:
+
+ENTRY(mioa701_bootstrap_lg)
+ .data
+ .align 2
+ .word 2b-0b