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efi: Tidy up device-tree-size calculation in copy_fdt()

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This is a bit confusing at present since it adds 4KB to the pointer, then
rounds it up. It looks like a bug, but is not.

Move the 4KB addition into a separate statement and expand the comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Simon Glass 2018-06-18 08:08:25 -06:00 committed by Alexander Graf
parent 404ea59364
commit bc9a638a10
1 changed files with 6 additions and 2 deletions
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8
cmd/bootefi.c
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@ -148,8 +148,12 @@ static void *copy_fdt(void *fdt)
fdt_ram_start = ram_start;
}
/* Give us at least 4kb breathing room */
fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
/*
* Give us at least 4KB of breathing room in case the device tree needs
* to be expanded later. Round up to the nearest EFI page boundary.
*/
fdt_size += 4096;
fdt_size = ALIGN(fdt_size + EFI_PAGE_SIZE - 1, EFI_PAGE_SIZE);
fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
/* Safe fdt location is at 128MB */