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bsps/aarch64/start: Add support for Image protocol

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This adds support for a the Image header protocol similar to the zImage
protocol that Linux kernels use to describe their expectations of the
system configuration.
This commit is contained in:
Kinsey Moore
2025-06-24 10:07:29 -05:00
committed by Kinsey Moore
parent 90587938e4
commit ad5a2be4c1
2 changed files with 39 additions and 0 deletions
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23
bsps/aarch64/shared/start/start.S
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@@ -37,12 +37,35 @@
#include <rtems/asm.h>
#include <rtems/score/percpu.h>
#include <bsp.h>
#include <bspopts.h>
/* Global symbols */
.globl _start
.section ".bsp_start_text", "ax"
#ifdef BSP_START_IMAGE_HEADER
/*
* This format is defined by:
* https://www.kernel.org/doc/Documentation/arm64/booting.txt
*/
mov x0, x0
b _start
/*
* This must be defined by the BSP as different environments may not treat it
* the same. Xen treats it as an offset from 0x40000000 while QEMU treats it
* as an absolute offset (RAM origin + load offset).
*/
.dword BSP_START_IMAGE_HEADER_LOAD_OFFSET
.dword 0 /* image size */
.dword 0 /* kernel flags, LE, page size unspecified, place near RAM start */
.dword 0 /* reserved 2 */
.dword 0 /* reserved 3 */
.dword 0 /* reserved 4 */
.word 0x644d5241 /* magic, ascii ['A', 'R', 'M', 64] LE */
.word 0 /* reserved 5, PE COFF offset */
#endif /* BSP_START_IMAGE_HEADER */
/* Start entry */
_start: