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dcbccd6a1e
The current boot device usage assumes read-only semantics to the boot device. Any time someone wants to write to the boot device a device-specific API is invoked such as SPI flash. Instead, provide a mechanism to retrieve an object that can be used to perform writes to the boot device. On systems where the implementations are symmetric these devices can be treated one-in-the-same. However, for x86 systems with memory mapped SPI the read-only boot device provides different operations. BUG=chrome-os-partner:55932 Change-Id: I0af324824f9e1a8e897c2453c36e865b59c4e004 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/16194 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2015 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <boot_device.h>
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void __attribute__((weak)) boot_device_init(void)
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{
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/* Provide weak do-nothing init. */
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}
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static int boot_device_subregion(const struct region *sub,
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struct region_device *subrd,
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const struct region_device *parent)
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{
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if (parent == NULL)
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return -1;
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return rdev_chain(subrd, parent, region_offset(sub), region_sz(sub));
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}
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int boot_device_ro_subregion(const struct region *sub,
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struct region_device *subrd)
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{
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/* Ensure boot device has been initialized at least once. */
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boot_device_init();
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return boot_device_subregion(sub, subrd, boot_device_ro());
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}
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int boot_device_rw_subregion(const struct region *sub,
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struct region_device *subrd)
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{
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/* Ensure boot device has been initialized at least once. */
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boot_device_init();
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return boot_device_subregion(sub, subrd, boot_device_rw());
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}
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