From e62cf5210c0c4b51bab803c7a3c8134da866da2b Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Fri, 27 Mar 2015 01:58:06 -0500 Subject: regions: add mmap helper device In order to facilitate platforms which need a buffer cache for performing boot device operations provide infrastructure to share the logic in managing the buffer and operations. Change-Id: I45dd9f213029706ff92a3e5a2c9edd5e8b541e27 Signed-off-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/9132 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/include/region.h | 17 +++++++++++++++++ src/lib/region.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+) (limited to 'src') diff --git a/src/include/region.h b/src/include/region.h index ed0ad57a28..99ea488cca 100644 --- a/src/include/region.h +++ b/src/include/region.h @@ -22,6 +22,7 @@ #include #include +#include /* * Region support. @@ -116,4 +117,20 @@ extern const struct region_device_ops mem_rdev_ops; .rdev = REGION_DEV_INIT(&mem_rdev_ops, 0, (size_)), \ } +struct mmap_helper_region_device { + struct mem_pool pool; + struct region_device rdev; +}; + +#define MMAP_HELPER_REGION_INIT(ops_, offset_, size_) \ + { \ + .rdev = REGION_DEV_INIT((ops_), (offset_), (size_)), \ + } + +void mmap_helper_device_init(struct mmap_helper_region_device *mdev, + void *cache, size_t cache_size); + +void *mmap_helper_rdev_mmap(const struct region_device *, size_t, size_t); +int mmap_helper_rdev_munmap(const struct region_device *, void *); + #endif /* _REGION_H_ */ diff --git a/src/lib/region.c b/src/lib/region.c index ca8cd7bcf7..b56b3d7e90 100644 --- a/src/lib/region.c +++ b/src/lib/region.c @@ -161,3 +161,41 @@ const struct region_device_ops mem_rdev_ops = { .munmap = mdev_munmap, .readat = mdev_readat, }; + +void mmap_helper_device_init(struct mmap_helper_region_device *mdev, + void *cache, size_t cache_size) +{ + mem_pool_init(&mdev->pool, cache, cache_size); +} + +void *mmap_helper_rdev_mmap(const struct region_device *rd, size_t offset, + size_t size) +{ + struct mmap_helper_region_device *mdev; + void *mapping; + + mdev = container_of((void *)rd, typeof(*mdev), rdev); + + mapping = mem_pool_alloc(&mdev->pool, size); + + if (mapping == NULL) + return NULL; + + if (rd->ops->readat(rd, mapping, offset, size) != size) { + mem_pool_free(&mdev->pool, mapping); + return NULL; + } + + return mapping; +} + +int mmap_helper_rdev_munmap(const struct region_device *rd, void *mapping) +{ + struct mmap_helper_region_device *mdev; + + mdev = container_of((void *)rd, typeof(*mdev), rdev); + + mem_pool_free(&mdev->pool, mapping); + + return 0; +} -- cgit v1.2.3