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Allow elfloader to put kernel images directly after firmware on RISCV #135

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Allow elfloader to put kernel images directly after firmware on RISCV #135

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+106 −120

Commits on Feb 22, 2022

  1. elfloader: port fixup_image_base to C 

    Porting from assembly to a higher level language makes this function
more portable.

Signed-off-by: Kent McLeod <[email protected]>
    @kent-mcleod
    kent-mcleod committed Feb 22, 2022
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  2. elfloader,RISC-V: Relax kernel alignment checks 

    It's not necessary to require the kernel and ELFloader images are loaded
at the start of page boundaries.

Signed-off-by: Kent McLeod <[email protected]>
    @kent-mcleod
    kent-mcleod committed Feb 22, 2022
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  3. elfloader,RISC-V: clear_bss unconditionally 

    When booting via opensbi, the image format is a binary image and so if
the .bss section is at the end it must be initialized unconditionally.

Signed-off-by: Kent McLeod <[email protected]>
    @kent-mcleod
    kent-mcleod committed Feb 22, 2022
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  4. Revert "riscv: Reposition .rodata to after .bss" 

    This reverts commit 8de8c9f.

Signed-off-by: Kent McLeod <[email protected]>
    @kent-mcleod
    kent-mcleod committed Feb 22, 2022
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  5. elfloader, RISC-V: Move the elfloader during boot 

    The SBI implementation usually loads the elfloader where the kernel
would prefer to also be loaded. Allow the elfloader to move itself to a
higher address before loading the kernel and user images.
This requires ensuring that the stacks are not overwritten during the
merge, and so must be placed before the _archive_cpio section in the
linker script.

Signed-off-by: Kent McLeod <[email protected]>
    @kent-mcleod
    kent-mcleod committed Feb 22, 2022
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  6. elfloader: Don't overwrite the platform DTB 

    If a DTB has been passed in from an earlier stage boot loader during an
elfloader image relocation, make sure that it doesn't get overwritten.

On Arm this isn't relevant as the protocol when relocation happens
doesn't also pass in a DTB.

Signed-off-by: Kent McLeod <[email protected]>
    @kent-mcleod
    kent-mcleod committed Feb 22, 2022
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