From b419c1a87ccb2037a88ffb533b5b4a11cfa387c0 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Fri, 27 Mar 2015 01:03:45 -0500 Subject: regions: add memory region device support Provide common code for using memory-backed region devices. This allows in-memory buffers to act as a region device. Change-Id: I266cd07bbfa16a427c2b31c512e7c87b77f47718 Signed-off-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/9131 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/lib/region.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'src/lib') diff --git a/src/lib/region.c b/src/lib/region.c index 948addd2ca..ca8cd7bcf7 100644 --- a/src/lib/region.c +++ b/src/lib/region.c @@ -119,3 +119,45 @@ int rdev_chain(struct region_device *child, const struct region_device *parent, return 0; } + +void mem_region_device_init(struct mem_region_device *mdev, void *base, + size_t size) +{ + memset(mdev, 0, sizeof(*mdev)); + mdev->base = base; + mdev->rdev.ops = &mem_rdev_ops; + mdev->rdev.region.size = size; +} + +static void *mdev_mmap(const struct region_device *rd, size_t offset, + size_t size) +{ + const struct mem_region_device *mdev; + + mdev = container_of(rd, typeof(*mdev), rdev); + + return &mdev->base[offset]; +} + +static int mdev_munmap(const struct region_device *rd, void *mapping) +{ + return 0; +} + +static ssize_t mdev_readat(const struct region_device *rd, void *b, + size_t offset, size_t size) +{ + const struct mem_region_device *mdev; + + mdev = container_of(rd, typeof(*mdev), rdev); + + memcpy(b, &mdev->base[offset], size); + + return size; +} + +const struct region_device_ops mem_rdev_ops = { + .mmap = mdev_mmap, + .munmap = mdev_munmap, + .readat = mdev_readat, +}; -- cgit v1.2.3