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[initrd] Swap initrds entirely in-place via triple reversal

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Eliminate the requirement for free space when reshuffling initrds by
swapping adjacent initrds using an in-place triple reversal.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-05-22 13:27:03 +01:00
parent 11e01f0652
commit 9231d8c952
2 changed files with 42 additions and 55 deletions
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6
src/include/ipxe/initrd.h
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@@ -11,12 +11,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
/** Minimum free space required to reshuffle initrds
*
* Chosen to avoid absurdly long reshuffling times
*/
#define INITRD_MIN_FREE_LEN ( 512 * 1024 )
extern void initrd_reshuffle ( physaddr_t bottom );
extern int initrd_reshuffle_check ( size_t len, physaddr_t bottom );