3ad83666f3
Currently, our overlay blob will grow to include the size of the complete overlay blob we're applying. This doesn't scale very well with a lot of overlays- they tend to include a lot of overhead, and they will generally only add a fraction of their total size to the blob they're being applied to. To combat this, pack the blob as we apply new overlays and keep track of how many overlays we've applied. Only ubldr has any fixups to be applied after overlays, so we only need to re-pad the blob in ubldr. Presumably the allocation won't fail since we just did a lot worse in trying to apply overlays and succeeded. I have no intention of removing the padding in make_dtb.sh. There might be an argument to be had over whether it should be configurable, since ubldr *is* the only loader that actually has fixups to be applied and we can do this at runtime, but I'm not too concerned about this. This diff has been sitting in Phabricator for a year and a half, but I've decided to flush it as it does make sure that we're scaling the blob appropriately and leave room at the end for fixups in case of some freak circumstance where applying overlays leaves us with a blob of insufficient size. Reviewed by: gonzo (a long time ago) MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D14133
63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/*-
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* Copyright (c) 2014 Andrew Turner <andrew@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef FDT_PLATFORM_H
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#define FDT_PLATFORM_H
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struct fdt_header;
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struct fdt_mem_region {
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unsigned long start;
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unsigned long size;
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};
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#define TMP_MAX_ETH 8
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int fdt_copy(vm_offset_t);
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void fdt_fixup_cpubusfreqs(unsigned long, unsigned long);
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void fdt_fixup_ethernet(const char *, char *, int);
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void fdt_fixup_memory(struct fdt_mem_region *, size_t);
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void fdt_fixup_stdout(const char *);
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int fdt_apply_overlays(void);
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int fdt_pad_dtb(size_t);
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int fdt_load_dtb_addr(struct fdt_header *);
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int fdt_load_dtb_file(const char *);
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void fdt_load_dtb_overlays(const char *);
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int fdt_setup_fdtp(void);
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int fdt_is_setup(void);
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/* The platform library needs to implement these functions */
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int fdt_platform_load_dtb(void);
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void fdt_platform_load_overlays(void);
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void fdt_platform_fixups(void);
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/* Devmatch/pnp function */
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const char *fdt_devmatch_next(int *tag, int *compatlen);
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#endif /* FDT_PLATFORM_H */
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