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writeprotect.h: add structure to represent chip wp configuration bits

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Add `struct wp_bits` for representing values of all WP bits in a chip's
status/config register(s).

It allows most WP code to store and manipulate a chip's configuration
without knowing the exact layout of bits in the chip's status registers.

Supporting other chips may require additional fields to be added to the
structure.

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

Change-Id: I17dee630248ce7b51e624a6e46d7097d5d0de809
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/58478
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 01:12:39 +11:00 committed by Anastasia Klimchuk
parent e007908657
commit 645e5e777a
1 changed files with 36 additions and 0 deletions
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36
writeprotect.h
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@ -18,6 +18,42 @@
#ifndef __WRITEPROTECT_H__ #ifndef __WRITEPROTECT_H__
#define __WRITEPROTECT_H__ 1 #define __WRITEPROTECT_H__ 1
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#define MAX_BP_BITS 4 #define MAX_BP_BITS 4
/*
* Description of a chip's write protection configuration.
*
* It allows most WP code to store and manipulate a chip's configuration
* without knowing the exact layout of bits in the chip's status registers.
*/
struct wp_bits {
/* Status register protection bit (SRP) */
bool srp_bit_present;
uint8_t srp;
/* Status register lock bit (SRL) */
bool srl_bit_present;
uint8_t srl;
/* Complement bit (CMP) */
bool cmp_bit_present;
uint8_t cmp;
/* Sector/block protection bit (SEC) */
bool sec_bit_present;
uint8_t sec;
/* Top/bottom protection bit (TB) */
bool tb_bit_present;
uint8_t tb;
/* Block protection bits (BP) */
size_t bp_bit_count;
uint8_t bp[MAX_BP_BITS];
};
#endif /* !__WRITEPROTECT_H__ */ #endif /* !__WRITEPROTECT_H__ */