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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3263 | Serge | 1 | #include |
| 2 | #include |
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| 3260 | Serge | 3 | #include |
| 4 | #include |
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| 5 | #include "i915_drv.h" |
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| 6 | #include "intel_drv.h" |
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| 7 | |||
| 8 | |||
| 9 | struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags) |
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| 10 | { |
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| 11 | struct file *filep; |
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| 12 | int count; |
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| 13 | |||
| 14 | filep = malloc(sizeof(*filep)); |
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| 15 | |||
| 16 | if(unlikely(filep == NULL)) |
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| 17 | return ERR_PTR(-ENOMEM); |
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| 18 | |||
| 19 | count = size / PAGE_SIZE; |
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| 20 | |||
| 21 | filep->pages = kzalloc(sizeof(struct page *) * count, 0); |
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| 22 | if(unlikely(filep->pages == NULL)) |
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| 23 | { |
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| 24 | kfree(filep); |
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| 25 | return ERR_PTR(-ENOMEM); |
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| 26 | }; |
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| 27 | |||
| 28 | filep->count = count; |
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| 29 | filep->allocated = 0; |
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| 30 | filep->vma = NULL; |
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| 31 | |||
| 3298 | Serge | 32 | // printf("%s file %p pages %p count %d\n", |
| 33 | // __FUNCTION__,filep, filep->pages, count); |
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| 3260 | Serge | 34 | |
| 35 | return filep; |
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| 36 | } |
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| 37 | |||
| 38 | struct page *shmem_read_mapping_page_gfp(struct file *filep, |
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| 39 | pgoff_t index, gfp_t gfp) |
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| 40 | { |
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| 41 | struct page *page; |
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| 42 | |||
| 43 | // dbgprintf("%s, file %p index %d\n", __FUNCTION__, filep, index); |
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| 44 | |||
| 45 | if(unlikely(index >= filep->count)) |
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| 46 | return ERR_PTR(-EINVAL); |
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| 47 | |||
| 48 | page = filep->pages[index]; |
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| 49 | |||
| 50 | if(unlikely(page == NULL)) |
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| 51 | { |
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| 52 | page = (struct page *)AllocPage(); |
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| 53 | |||
| 54 | if(unlikely(page == NULL)) |
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| 55 | return ERR_PTR(-ENOMEM); |
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| 56 | |||
| 57 | filep->pages[index] = page; |
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| 58 | }; |
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| 59 | |||
| 60 | return page; |
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| 61 | }; |
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| 3263 | Serge | 62 | |
| 63 | unsigned long vm_mmap(struct file *file, unsigned long addr, |
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| 64 | unsigned long len, unsigned long prot, |
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| 65 | unsigned long flag, unsigned long offset) |
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| 66 | { |
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| 67 | char *mem, *ptr; |
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| 68 | int i; |
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| 69 | |||
| 70 | if (unlikely(offset + PAGE_ALIGN(len) < offset)) |
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| 71 | return -EINVAL; |
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| 72 | if (unlikely(offset & ~PAGE_MASK)) |
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| 73 | return -EINVAL; |
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| 74 | |||
| 75 | mem = UserAlloc(len); |
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| 76 | if(unlikely(mem == NULL)) |
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| 77 | return -ENOMEM; |
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| 78 | |||
| 79 | for(i = offset, ptr = mem; i < offset+len; i+= 4096, ptr+= 4096) |
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| 80 | { |
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| 81 | struct page *page; |
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| 82 | |||
| 83 | page = shmem_read_mapping_page_gfp(file, i/PAGE_SIZE,0); |
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| 84 | |||
| 85 | if (unlikely(IS_ERR(page))) |
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| 86 | goto err; |
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| 87 | |||
| 88 | MapPage(ptr, (addr_t)page, PG_SHARED|PG_UW); |
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| 89 | } |
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| 90 | |||
| 91 | return (unsigned long)mem; |
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| 92 | err: |
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| 93 | UserFree(mem); |
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| 94 | return -ENOMEM; |
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| 95 | }; |
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| 96 | |||
| 3290 | Serge | 97 | void shmem_file_delete(struct file *filep) |
| 98 | { |
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| 3298 | Serge | 99 | // printf("%s file %p pages %p count %d\n", |
| 100 | // __FUNCTION__, filep, filep->pages, filep->count); |
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| 3263 | Serge | 101 | |
| 3290 | Serge | 102 | if(filep->pages) |
| 103 | kfree(filep->pages); |
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| 104 | } |