x86/boot/compressed/32: Save the output address instead of recalculating it

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In preparation for being able to decompress into a buffer starting at a
different address than startup_32, save the calculated output address
instead of recalculating it later.

We now keep track of three addresses:

	%edx: startup_32 as we were loaded by bootloader
	%ebx: new location of compressed kernel
	%ebp: start of decompression buffer

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200303221205.4048668-2-nivedita@alum.mit.edu
Link: https://lore.kernel.org/r/20200308080859.21568-16-ardb@kernel.org

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Arvind Sankar 2020-03-08 09:08:46 +01:00 • committed by Ingo Molnar

parent f3fa0efce2

commit 8ef44be393

1 changed files with 12 additions and 13 deletions

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arch/x86/boot/compressed/head_32.S

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