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regions: add mmap helper device

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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 <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9132
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Aaron Durbin 2015-03-27 01:58:06 -05:00
parent b419c1a87c
commit e62cf5210c
2 changed files with 55 additions and 0 deletions
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17
src/include/region.h
View File

@ -22,6 +22,7 @@
#include <stdint.h> #include <stdint.h>
#include <stddef.h> #include <stddef.h>
#include <mem_pool.h>
/* /*
* Region support. * Region support.
@ -116,4 +117,20 @@ extern const struct region_device_ops mem_rdev_ops;
.rdev = REGION_DEV_INIT(&mem_rdev_ops, 0, (size_)), \ .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_ */ #endif /* _REGION_H_ */

38
src/lib/region.c
View File

@ -161,3 +161,41 @@ const struct region_device_ops mem_rdev_ops = {
.munmap = mdev_munmap, .munmap = mdev_munmap,
.readat = mdev_readat, .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;
}