Changes in kernel/arch/ia32/src/ddi/ddi.c [c5396c1:6eeb4a3] in mainline
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kernel/arch/ia32/src/ddi/ddi.c
rc5396c1 r6eeb4a3 45 45 #include <arch.h> 46 46 #include <align.h> 47 48 /** Enable I/O space range for task.49 *50 * Interrupts are disabled and task is locked.51 *52 * @param task Task.53 * @param ioaddr Startign I/O space address.54 * @param size Size of the enabled I/O range.55 *56 * @return 0 on success or an error code from errno.h.57 *58 */59 int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)60 {61 size_t elements = ioaddr + size;62 if (elements > IO_PORTS)63 return ENOENT;64 65 if (task->arch.iomap.elements < elements) {66 /*67 * The I/O permission bitmap is too small and needs to be grown.68 */69 70 void *store = malloc(bitmap_size(elements), FRAME_ATOMIC);71 if (!store)72 return ENOMEM;73 74 bitmap_t oldiomap;75 bitmap_initialize(&oldiomap, task->arch.iomap.elements,76 task->arch.iomap.bits);77 78 bitmap_initialize(&task->arch.iomap, elements, store);79 80 /*81 * Mark the new range inaccessible.82 */83 bitmap_set_range(&task->arch.iomap, oldiomap.elements,84 elements - oldiomap.elements);85 86 /*87 * In case there really existed smaller iomap,88 * copy its contents and deallocate it.89 */90 if (oldiomap.bits) {91 bitmap_copy(&task->arch.iomap, &oldiomap,92 oldiomap.elements);93 94 free(oldiomap.bits);95 }96 }97 98 /*99 * Enable the range and we are done.100 */101 bitmap_clear_range(&task->arch.iomap, (size_t) ioaddr, size);102 103 /*104 * Increment I/O Permission bitmap generation counter.105 */106 task->arch.iomapver++;107 108 return 0;109 }110 47 111 48 /** Install I/O Permission bitmap.
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