50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
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/*
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* Copyright 2012 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs
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*/
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#include <subdev/bios.h>
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#include <subdev/bios/bit.h>
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int
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bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit)
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{
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if (likely(bios->bit_offset)) {
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u8 entries = nvbios_rd08(bios, bios->bit_offset + 10);
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u32 entry = bios->bit_offset + 12;
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while (entries--) {
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if (nvbios_rd08(bios, entry + 0) == id) {
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bit->id = nvbios_rd08(bios, entry + 0);
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bit->version = nvbios_rd08(bios, entry + 1);
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bit->length = nvbios_rd16(bios, entry + 2);
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bit->offset = nvbios_rd16(bios, entry + 4);
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return 0;
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}
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entry += nvbios_rd08(bios, bios->bit_offset + 9);
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}
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return -ENOENT;
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}
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return -EINVAL;
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}
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