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Subject[PATCH 3/5] arm: decompressor: define a new zImage tag
Date
Add DCSZ tag which holds dynamic memory (stack, bss, malloc pool)
requirements of the decompressor code.

Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
---
arch/arm/boot/compressed/vmlinux.lds.S | 9 ++++++++-
arch/arm/include/asm/image.h | 13 +++++++++++++
2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S
index 308e9cd6a897..dcfdb3209c90 100644
--- a/arch/arm/boot/compressed/vmlinux.lds.S
+++ b/arch/arm/boot/compressed/vmlinux.lds.S
@@ -39,6 +39,11 @@ SECTIONS
LONG(ARM_ZIMAGE_MAGIC3)
LONG(ZIMAGE_MAGIC(__piggy_size_addr - _start))
LONG(ZIMAGE_MAGIC(_kernel_bss_size))
+ LONG(ZIMAGE_MAGIC(5))
+ LONG(ARM_ZIMAGE_MAGIC4)
+ LONG(ZIMAGE_MAGIC(_end - __bss_start))
+ LONG(ZIMAGE_MAGIC(_stack_end - _stack_start))
+ LONG(ZIMAGE_MAGIC(_malloc_size))
LONG(0)
_table_end = .;
}
@@ -108,10 +113,12 @@ SECTIONS
. = BSS_START;
__bss_start = .;
.bss : { *(.bss) }
+ . = ALIGN(8); /* the stack must be 64-bit aligned and adjoin bss */
_end = .;

- . = ALIGN(8); /* the stack must be 64-bit aligned */
+ _stack_start = .;
.stack : { *(.stack) }
+ _stack_end = .;

PROVIDE(__pecoff_data_size = ALIGN(512) - ADDR(.data));
PROVIDE(__pecoff_end = ALIGN(512));
diff --git a/arch/arm/include/asm/image.h b/arch/arm/include/asm/image.h
index d5c18a0f6a34..624438740f23 100644
--- a/arch/arm/include/asm/image.h
+++ b/arch/arm/include/asm/image.h
@@ -15,6 +15,7 @@
#define ARM_ZIMAGE_MAGIC1 ZIMAGE_MAGIC(0x016f2818)
#define ARM_ZIMAGE_MAGIC2 (0x45454545)
#define ARM_ZIMAGE_MAGIC3 ZIMAGE_MAGIC(0x5a534c4b)
+#define ARM_ZIMAGE_MAGIC4 ZIMAGE_MAGIC(0x5a534344)

#ifndef __ASSEMBLY__

@@ -43,6 +44,18 @@ struct arm_zimage_tag {
} u;
};

+struct arm_zimage_tag_dc {
+ struct tag_header hdr;
+ union {
+#define ZIMAGE_TAG_DECOMP_SIZE ARM_ZIMAGE_MAGIC4
+ struct zimage_decomp_size {
+ __le32 bss_size;
+ __le32 stack_size;
+ __le32 malloc_size;
+ } decomp_size;
+ } u;
+};
+
#endif /* __ASSEMBLY__ */

#endif /* __ASM_IMAGE_H */
--
2.26.2
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