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0e5569a08c
I took the implementation from OpenBSD, commit d55ef580b1748517027c3eabdb715316ca5b1442. The only difference is the addition of `dma_buf_map_is_equal()`. Reviewed by: manu Approved by: manu Differential Revision: https://reviews.freebsd.org/D36963
91 lines
1.6 KiB
C
91 lines
1.6 KiB
C
/* Public domain. */
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#ifndef _LINUX_DMA_BUF_MAP_H
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#define _LINUX_DMA_BUF_MAP_H
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#include <linux/io.h>
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#include <linux/string.h>
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struct dma_buf_map {
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union {
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void *vaddr_iomem;
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void *vaddr;
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};
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bool is_iomem;
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};
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static inline void
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dma_buf_map_incr(struct dma_buf_map *dbm, size_t n)
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{
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if (dbm->is_iomem)
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dbm->vaddr_iomem += n;
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else
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dbm->vaddr += n;
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}
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static inline void
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dma_buf_map_memcpy_to(struct dma_buf_map *dbm, const void *src, size_t len)
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{
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if (dbm->is_iomem)
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memcpy_toio(dbm->vaddr_iomem, src, len);
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else
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memcpy(dbm->vaddr, src, len);
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}
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static inline bool
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dma_buf_map_is_null(const struct dma_buf_map *dbm)
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{
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if (dbm->is_iomem)
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return (dbm->vaddr_iomem == NULL);
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else
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return (dbm->vaddr == NULL);
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}
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static inline bool
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dma_buf_map_is_set(const struct dma_buf_map *dbm)
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{
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if (dbm->is_iomem)
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return (dbm->vaddr_iomem != NULL);
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else
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return (dbm->vaddr != NULL);
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}
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static inline bool
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dma_buf_map_is_equal(
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const struct dma_buf_map *dbm_a, const struct dma_buf_map *dbm_b)
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{
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if (dbm_a->is_iomem != dbm_b->is_iomem)
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return (false);
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if (dbm_a->is_iomem)
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return (dbm_a->vaddr_iomem == dbm_b->vaddr_iomem);
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else
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return (dbm_a->vaddr == dbm_b->vaddr);
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}
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static inline void
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dma_buf_map_clear(struct dma_buf_map *dbm)
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{
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if (dbm->is_iomem) {
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dbm->vaddr_iomem = NULL;
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dbm->is_iomem = false;
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} else {
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dbm->vaddr = NULL;
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}
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}
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static inline void
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dma_buf_map_set_vaddr_iomem(struct dma_buf_map *dbm, void *addr)
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{
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dbm->vaddr_iomem = addr;
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dbm->is_iomem = true;
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}
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static inline void
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dma_buf_map_set_vaddr(struct dma_buf_map *dbm, void *addr)
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{
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dbm->vaddr = addr;
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dbm->is_iomem = false;
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}
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#endif
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