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    Subject[PATCH v3 2/4] 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 | 3 +++
    2 files changed, 11 insertions(+), 1 deletion(-)

    diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S
    index a6b151112ac5..3e7443b52f5b 100644
    --- a/arch/arm/boot/compressed/vmlinux.lds.S
    +++ b/arch/arm/boot/compressed/vmlinux.lds.S
    @@ -43,6 +43,11 @@ SECTIONS
    LONG(ZIMAGE_MAGIC(_kernel_bss_size))
    LONG(ZIMAGE_MAGIC(TEXT_OFFSET))
    LONG(ZIMAGE_MAGIC(MALLOC_SIZE))
    + LONG(ZIMAGE_MAGIC(3))
    + LONG(ARM_ZIMAGE_MAGIC4)
    + LONG(ZIMAGE_MAGIC((_end - __bss_start) +
    + (_stack_end - _stack_start) +
    + MALLOC_SIZE))
    LONG(0)
    _table_end = .;
    }
    @@ -117,10 +122,12 @@ 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 8150b9490e86..8be6dbc69fbb 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__

    @@ -42,6 +43,8 @@ struct arm_zimage_tag {
    __le32 text_offset;
    __le32 malloc_size;
    } krnl_size;
    +#define ZIMAGE_TAG_ZIMAGE_MEM ARM_ZIMAGE_MAGIC4
    + __le32 zimage_mem;
    } u;
    };

    --
    2.26.2
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