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45 by root
North West Logick DMA implementation 
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#ifndef _PCILIB_KMEM_H

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#define _PCILIB_KMEM_H

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#include "pcilib.h"








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#include "tools.h"








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North West Logick DMA implementation



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typedef enum {








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    PCILIB_KMEM_FLAG_REUSE = KMEM_FLAG_REUSE,










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    PCILIB_KMEM_FLAG_EXCLUSIVE = KMEM_FLAG_EXCLUSIVE,










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    PCILIB_KMEM_FLAG_PERSISTENT = KMEM_FLAG_PERSISTENT,








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    PCILIB_KMEM_FLAG_HARDWARE = KMEM_FLAG_HW,








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Support exporting data from kernel buffers



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    PCILIB_KMEM_FLAG_FORCE = KMEM_FLAG_FORCE,










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    PCILIB_KMEM_FLAG_TRY =  KMEM_FLAG_TRY








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} pcilib_kmem_flags_t;










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typedef enum {








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    PCILIB_KMEM_REUSE_ALLOCATED = PCILIB_TRISTATE_NO,








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    PCILIB_KMEM_REUSE_REUSED = PCILIB_TRISTATE_YES,










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    PCILIB_KMEM_REUSE_PARTIAL = PCILIB_TRISTATE_PARTIAL,










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    PCILIB_KMEM_REUSE_PERSISTENT = 0x100,










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    PCILIB_KMEM_REUSE_HARDWARE = 0x200










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} pcilib_kmem_reuse_state_t;










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typedef struct {










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    int handle_id;








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    pcilib_kmem_reuse_state_t reused;










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    uintptr_t pa;










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//    uintptr_t va;










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    void *ua;










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    size_t size;








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Support alignments in kmem allocation



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    size_t alignment_offset;










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    size_t mmap_offset;








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} pcilib_kmem_addr_t;










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/**










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 * single allocation - we set only addr, n_blocks = 0










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 * multiple allocation - addr is not set, blocks are set, n_blocks > 0










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 * sgmap allocation - addr contains ua, but pa's are set in blocks, n_blocks > 0










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 */










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typedef struct {










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    pcilib_kmem_addr_t addr;








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    pcilib_kmem_reuse_state_t reused;








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    size_t n_blocks;










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    pcilib_kmem_addr_t blocks[];










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} pcilib_kmem_buffer_t;










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typedef void pcilib_kmem_handle_t;










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typedef struct pcilib_kmem_list_s pcilib_kmem_list_t;










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struct pcilib_kmem_list_s {










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    pcilib_kmem_list_t *next, *prev;










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    pcilib_kmem_buffer_t buf;	// variable size, should be last item in struct










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};










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pcilib_kmem_handle_t *pcilib_alloc_kernel_memory(pcilib_t *ctx, pcilib_kmem_type_t type, size_t nmemb, size_t size, size_t alignment, pcilib_kmem_use_t use, pcilib_kmem_flags_t flags);








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void pcilib_free_kernel_memory(pcilib_t *ctx, pcilib_kmem_handle_t *k, pcilib_kmem_flags_t flags);








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Sync only required buffers



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//int pcilib_sync_kernel_memory(pcilib_t *ctx, pcilib_kmem_handle_t *k, pcilib_kmem_sync_direction_t dir);










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int pcilib_kmem_sync_block(pcilib_t *ctx, pcilib_kmem_handle_t *k, pcilib_kmem_sync_direction_t dir, size_t block);








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void *pcilib_kmem_get_ua(pcilib_t *ctx, pcilib_kmem_handle_t *k);










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uintptr_t pcilib_kmem_get_pa(pcilib_t *ctx, pcilib_kmem_handle_t *k);










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void *pcilib_kmem_get_block_ua(pcilib_t *ctx, pcilib_kmem_handle_t *k, size_t block);










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uintptr_t pcilib_kmem_get_block_pa(pcilib_t *ctx, pcilib_kmem_handle_t *k, size_t block);










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size_t pcilib_kmem_get_block_size(pcilib_t *ctx, pcilib_kmem_handle_t *k, size_t block);








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pcilib_kmem_reuse_state_t pcilib_kmem_is_reused(pcilib_t *ctx, pcilib_kmem_handle_t *k);








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int pcilib_clean_kernel_memory(pcilib_t *ctx, pcilib_kmem_use_t use, pcilib_kmem_flags_t flags);










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#endif /* _PCILIB_KMEM_H */