move booti_setup to arch/arm/lig/image.c

Follow bootz's pattern by moving the booti_setup to arch/arm/lib.
This allows to use booti_setup in other paths, e.g booting
an Android image containing Image format.

Note that kernel relocation is move out of booti_setup and it is the
caller's responsibility to do it and allows them do it differently. say,
cmd/booti.c just do a manually, while in the bootm path, we can use
bootm_load_os(with some changes).

Signed-off-by: Bin Chen <bin.chen@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/lib/Makefile

@@ -32,7 +32,7 @@ endif
 
 obj-$(CONFIG_CPU_V7M) += cmd_boot.o
 obj-$(CONFIG_OF_LIBFDT) += bootm-fdt.o
-obj-$(CONFIG_CMD_BOOTI) += bootm.o
+obj-$(CONFIG_CMD_BOOTI) += bootm.o image.o
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-$(CONFIG_CMD_BOOTZ) += bootm.o zimage.o
 obj-$(CONFIG_SYS_L2_PL310) += cache-pl310.o

arch/arm/lib/image.c

@@ -0,0 +1,77 @@
+/*
+ * (C) Copyright 2000-2009
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <mapmem.h>
+#include <linux/sizes.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define LINUX_ARM64_IMAGE_MAGIC 0x644d5241
+
+/* See Documentation/arm64/booting.txt in the Linux kernel */
+struct Image_header {
+    uint32_t    code0;      /* Executable code */
+    uint32_t    code1;      /* Executable code */
+    uint64_t    text_offset;    /* Image load offset, LE */
+    uint64_t    image_size; /* Effective Image size, LE */
+    uint64_t    flags;      /* Kernel flags, LE */
+    uint64_t    res2;       /* reserved */
+    uint64_t    res3;       /* reserved */
+    uint64_t    res4;       /* reserved */
+    uint32_t    magic;      /* Magic number */
+    uint32_t    res5;
+};
+
+int booti_setup(ulong image, ulong *relocated_addr, ulong *size)
+{
+    struct Image_header *ih;
+    uint64_t dst;
+    uint64_t image_size, text_offset;
+
+    *relocated_addr = image;
+
+    ih = (struct Image_header *)map_sysmem(image, 0);
+
+    if (ih->magic != le32_to_cpu(LINUX_ARM64_IMAGE_MAGIC)) {
+        puts("Bad Linux ARM64 Image magic!\n");
+        return 1;
+    }
+
+    /*
+     * Prior to Linux commit a2c1d73b94ed, the text_offset field
+     * is of unknown endianness.  In these cases, the image_size
+     * field is zero, and we can assume a fixed value of 0x80000.
+     */
+    if (ih->image_size == 0) {
+        puts("Image lacks image_size field, assuming 16MiB\n");
+        image_size = 16 << 20;
+        text_offset = 0x80000;
+    } else {
+        image_size = le64_to_cpu(ih->image_size);
+        text_offset = le64_to_cpu(ih->text_offset);
+    }
+
+    *size = image_size;
+
+    /*
+     * If bit 3 of the flags field is set, the 2MB aligned base of the
+     * kernel image can be anywhere in physical memory, so respect
+     * images->ep.  Otherwise, relocate the image to the base of RAM
+     * since memory below it is not accessible via the linear mapping.
+     */
+    if (le64_to_cpu(ih->flags) & BIT(3))
+        dst = image - text_offset;
+    else
+        dst = gd->bd->bi_dram[0].start;
+
+    *relocated_addr = ALIGN(dst, SZ_2M) + text_offset;
+
+    unmap_sysmem(ih);
+
+    return 0;
+}