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libflashrom,writeprotect: add functions for reading/writing WP configs

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New functions are exposed through the libflashrom API for
reading/writing chip's WP settins: `flashrom_wp_{read,write}_cfg()`.

They read/write an opaque `struct flashrom_wp_cfg` instance, which
includes the flash protection range and status register protection mode.

This commit also adds `{read,write}_wp_bits()` helper functions that
read/write chip-specific WP configuration bits.

BUG=b:195381327,b:153800563
BRANCH=none
TEST=flashrom --wp-{enable,disable,range,list,status} at end of patch series

Change-Id: I3ad25708c3321b8fb0216c3eaf6ffc07616537ad
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/58479
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Nikolai Artemiev
2021-10-21 00:58:12 +11:00
committed by Anastasia Klimchuk
parent 645e5e777a
commit cff87a8488
4 changed files with 363 additions and 0 deletions
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29
libflashrom.h
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@ -1,6 +1,7 @@
/*
* This file is part of the flashrom project.
*
* Copyright (C) 2010 Google Inc.
* Copyright (C) 2012 secunet Security Networks AG
* (Written by Nico Huber <nico.huber@secunet.com> for secunet)
*
@ -119,4 +120,32 @@ int flashrom_layout_get_region_range(struct flashrom_layout *, const char *name,
void flashrom_layout_release(struct flashrom_layout *);
void flashrom_layout_set(struct flashrom_flashctx *, const struct flashrom_layout *);
/** @ingroup flashrom-wp */
enum flashrom_wp_result {
FLASHROM_WP_OK = 0,
FLASHROM_WP_ERR_CHIP_UNSUPPORTED = 1,
FLASHROM_WP_ERR_OTHER = 2,
FLASHROM_WP_ERR_READ_FAILED = 3,
FLASHROM_WP_ERR_WRITE_FAILED = 4,
FLASHROM_WP_ERR_VERIFY_FAILED = 5
};
enum flashrom_wp_mode {
FLASHROM_WP_MODE_DISABLED,
FLASHROM_WP_MODE_HARDWARE,
FLASHROM_WP_MODE_POWER_CYCLE,
FLASHROM_WP_MODE_PERMANENT
};
struct flashrom_wp_cfg;
enum flashrom_wp_result flashrom_wp_cfg_new(struct flashrom_wp_cfg **);
void flashrom_wp_cfg_release(struct flashrom_wp_cfg *);
void flashrom_wp_set_mode(struct flashrom_wp_cfg *, enum flashrom_wp_mode);
enum flashrom_wp_mode flashrom_wp_get_mode(const struct flashrom_wp_cfg *);
void flashrom_wp_set_range(struct flashrom_wp_cfg *, size_t start, size_t len);
void flashrom_wp_get_range(size_t *start, size_t *len, const struct flashrom_wp_cfg *);
enum flashrom_wp_result flashrom_wp_read_cfg(struct flashrom_wp_cfg *, struct flashrom_flashctx *);
enum flashrom_wp_result flashrom_wp_write_cfg(struct flashrom_flashctx *, const struct flashrom_wp_cfg *);
#endif /* !__LIBFLASHROM_H__ */