From 6d4c1f5f43cd1ca0324b9199af9e4a65966dc301 Mon Sep 17 00:00:00 2001 From: Rizwan Qureshi Date: Fri, 26 Oct 2018 16:54:42 +0530 Subject: lib/boot_device: Add API for write protect a region Add API that should be implemented by the boot media drivers for write-protecting a subregion. Change-Id: I4c9376e2c2c7a4852f13c65824c6cd64a1c6ac0a Signed-off-by: Rizwan Qureshi Reviewed-on: https://review.coreboot.org/c/28724 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Rudolph --- src/include/boot_device.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'src/include') diff --git a/src/include/boot_device.h b/src/include/boot_device.h index cc70442e1e..c882968e58 100644 --- a/src/include/boot_device.h +++ b/src/include/boot_device.h @@ -18,6 +18,22 @@ #include +/* + * Boot device region can be protected by 2 sources, media and controller. + * The following modes are identified. It depends on the flash chip and the + * controller if mode is actually supported. + * + * MEDIA_WP : Flash/Boot device enforces write protect + * CTRLR_WP : Controller device enforces write protect + * CTRLR_RP : Controller device enforces read protect + * CTRLR_RWP : Controller device enforces read-write protect + */ +enum bootdev_prot_type { + CTRLR_WP = 1, + CTRLR_RP = 2, + CTRLR_RWP = 3, + MEDIA_WP = 4, +}; /* * Please note that the read-only boot device may not be coherent with * the read-write boot device. Thus, mixing mmap() and writeat() is @@ -44,6 +60,14 @@ int boot_device_ro_subregion(const struct region *sub, int boot_device_rw_subregion(const struct region *sub, struct region_device *subrd); +/* + * Write protect a sub-region of the boot device represented + * by the region device. + * Returns 0 on success, < 0 on error. + */ +int boot_device_wp_region(struct region_device *rd, + const enum bootdev_prot_type type); + /* * Initialize the boot device. This may be called multiple times within * a stage so boot device implementations should account for this behavior. -- cgit v1.2.3