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-rw-r--r--arch/sh/boot/romimage/head.S85
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/sh/boot/romimage/head.S b/arch/sh/boot/romimage/head.S
new file mode 100644
index 0000000000..81a0652a3d
--- /dev/null
+++ b/arch/sh/boot/romimage/head.S
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/arch/sh/boot/romimage/head.S
+ *
+ * Board specific setup code, executed before zImage loader
+ */
+
+.text
+ #include <asm/page.h>
+
+ .global romstart
+romstart:
+ /* include board specific setup code */
+#include <mach/romimage.h>
+
+#ifdef CONFIG_ROMIMAGE_MMCIF
+ /* load the romImage to above the empty zero page */
+ mov.l empty_zero_page_dst, r4
+ mov.l empty_zero_page_dst_adj, r5
+ add r5, r4
+ mov.l bytes_to_load, r5
+ mov.l loader_function, r7
+ jsr @r7
+ mov r4, r15
+
+ mov.l empty_zero_page_dst, r4
+ mov.l empty_zero_page_dst_adj, r5
+ add r5, r4
+ mov.l loaded_code_offs, r5
+ add r5, r4
+ jmp @r4
+ nop
+
+ .balign 4
+empty_zero_page_dst_adj:
+ .long PAGE_SIZE
+bytes_to_load:
+ .long end_data - romstart
+loader_function:
+ .long mmcif_loader
+loaded_code_offs:
+ .long loaded_code - romstart
+loaded_code:
+#endif /* CONFIG_ROMIMAGE_MMCIF */
+
+ /* copy the empty_zero_page contents to where vmlinux expects it */
+ mova extra_data_pos, r0
+ mov.l extra_data_size, r1
+ add r1, r0
+ mov.l empty_zero_page_dst, r1
+ mov #(PAGE_SHIFT - 4), r4
+ mov #1, r3
+ shld r4, r3 /* r3 = PAGE_SIZE / 16 */
+
+1:
+ mov.l @r0, r4
+ mov.l @(4, r0), r5
+ mov.l @(8, r0), r6
+ mov.l @(12, r0), r7
+ add #16,r0
+ mov.l r4, @r1
+ mov.l r5, @(4, r1)
+ mov.l r6, @(8, r1)
+ mov.l r7, @(12, r1)
+ dt r3
+ add #16,r1
+ bf 1b
+
+ /* jump to the zImage entry point located after the zero page data */
+ mov #PAGE_SHIFT, r4
+ mov #1, r1
+ shld r4, r1
+ mova extra_data_pos, r0
+ add r1, r0
+ mov.l extra_data_size, r1
+ add r1, r0
+ jmp @r0
+ nop
+
+ .align 2
+empty_zero_page_dst:
+ .long _text
+extra_data_pos:
+extra_data_size:
+ .long zero_page_pos - extra_data_pos