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/*
* (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;
}
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