| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2015 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <commonlib/region.h> |
| #include <string.h> |
| |
| static inline size_t region_end(const struct region *r) |
| { |
| return region_sz(r) + region_offset(r); |
| } |
| |
| static int is_subregion(const struct region *p, const struct region *c) |
| { |
| if (region_offset(c) < region_offset(p)) |
| return 0; |
| |
| if (region_sz(c) > region_sz(p)) |
| return 0; |
| |
| if (region_end(c) > region_end(p)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int normalize_and_ok(const struct region *outer, struct region *inner) |
| { |
| inner->offset += region_offset(outer); |
| return is_subregion(outer, inner); |
| } |
| |
| static const struct region_device *rdev_root(const struct region_device *rdev) |
| { |
| if (rdev->root == NULL) |
| return rdev; |
| return rdev->root; |
| } |
| |
| void *rdev_mmap(const struct region_device *rd, size_t offset, size_t size) |
| { |
| const struct region_device *rdev; |
| struct region req = { |
| .offset = offset, |
| .size = size, |
| }; |
| |
| if (!normalize_and_ok(&rd->region, &req)) |
| return NULL; |
| |
| rdev = rdev_root(rd); |
| |
| return rdev->ops->mmap(rdev, req.offset, req.size); |
| } |
| |
| int rdev_munmap(const struct region_device *rd, void *mapping) |
| { |
| const struct region_device *rdev; |
| |
| rdev = rdev_root(rd); |
| |
| return rdev->ops->munmap(rdev, mapping); |
| } |
| |
| ssize_t rdev_readat(const struct region_device *rd, void *b, size_t offset, |
| size_t size) |
| { |
| const struct region_device *rdev; |
| struct region req = { |
| .offset = offset, |
| .size = size, |
| }; |
| |
| if (!normalize_and_ok(&rd->region, &req)) |
| return -1; |
| |
| rdev = rdev_root(rd); |
| |
| return rdev->ops->readat(rdev, b, req.offset, req.size); |
| } |
| |
| int rdev_chain(struct region_device *child, const struct region_device *parent, |
| size_t offset, size_t size) |
| { |
| struct region req = { |
| .offset = offset, |
| .size = size, |
| }; |
| |
| if (!normalize_and_ok(&parent->region, &req)) |
| return -1; |
| |
| /* Keep track of root region device. Note the offsets are relative |
| * to the root device. */ |
| child->root = rdev_root(parent); |
| child->ops = NULL; |
| child->region.offset = req.offset; |
| child->region.size = req.size; |
| |
| 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, |
| }; |
| |
| 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; |
| } |
| |
| static void *xlate_mmap(const struct region_device *rd, size_t offset, |
| size_t size) |
| { |
| const struct xlate_region_device *xldev; |
| struct region req = { |
| .offset = offset, |
| .size = size, |
| }; |
| |
| xldev = container_of(rd, typeof(*xldev), rdev); |
| |
| if (!is_subregion(&xldev->sub_region, &req)) |
| return NULL; |
| |
| offset -= region_offset(&xldev->sub_region); |
| |
| return rdev_mmap(xldev->access_dev, offset, size); |
| } |
| |
| static int xlate_munmap(const struct region_device *rd, void *mapping) |
| { |
| const struct xlate_region_device *xldev; |
| |
| xldev = container_of(rd, typeof(*xldev), rdev); |
| |
| return rdev_munmap(xldev->access_dev, mapping); |
| } |
| |
| static ssize_t xlate_readat(const struct region_device *rd, void *b, |
| size_t offset, size_t size) |
| { |
| struct region req = { |
| .offset = offset, |
| .size = size, |
| }; |
| const struct xlate_region_device *xldev; |
| |
| xldev = container_of(rd, typeof(*xldev), rdev); |
| |
| if (!is_subregion(&xldev->sub_region, &req)) |
| return -1; |
| |
| offset -= region_offset(&xldev->sub_region); |
| |
| return rdev_readat(xldev->access_dev, b, offset, size); |
| } |
| |
| const struct region_device_ops xlate_rdev_ops = { |
| .mmap = xlate_mmap, |
| .munmap = xlate_munmap, |
| .readat = xlate_readat, |
| }; |