+
+/*
+ * uio_resid - return the residual IO value for the given uio_t
+ */
+user_ssize_t uio_resid( uio_t a_uio )
+{
+#if DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+/* if (IS_VALID_UIO_SEGFLG(a_uio->uio_segflg) == 0) { */
+/* panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__); */
+/* } */
+#endif /* DEBUG */
+
+ /* return 0 if there are no active iovecs */
+ if (a_uio == NULL) {
+ return( 0 );
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+#if 1 // LP64todo - remove this temp workaround once we go live with uio KPI
+ return( (user_ssize_t)a_uio->uio_resid );
+#else
+ return( a_uio->uio_resid_64 );
+#endif
+ }
+ return( (user_ssize_t)a_uio->uio_resid );
+}
+
+/*
+ * uio_setresid - set the residual IO value for the given uio_t
+ */
+void uio_setresid( uio_t a_uio, user_ssize_t a_value )
+{
+#if DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+/* if (IS_VALID_UIO_SEGFLG(a_uio->uio_segflg) == 0) { */
+/* panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__); */
+/* } */
+#endif /* DEBUG */
+
+ if (a_uio == NULL) {
+ return;
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+#if 1 // LP64todo - remove this temp workaround once we go live with uio KPI
+ a_uio->uio_resid = (int)a_value;
+#else
+ a_uio->uio_resid_64 = a_value;
+#endif
+ }
+ else {
+ a_uio->uio_resid = (int)a_value;
+ }
+ return;
+}
+
+#if 0 // obsolete
+/*
+ * uio_proc_t - return the proc_t for the given uio_t
+ * WARNING - This call is going away. Find another way to get the proc_t!!
+ */
+__private_extern__ proc_t uio_proc_t( uio_t a_uio )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ /* return 0 if there are no active iovecs */
+ if (a_uio == NULL) {
+ return( NULL );
+ }
+ return( a_uio->uio_procp );
+}
+
+/*
+ * uio_setproc_t - set the residual IO value for the given uio_t
+ * WARNING - This call is going away.
+ */
+__private_extern__ void uio_setproc_t( uio_t a_uio, proc_t a_proc_t )
+{
+ if (a_uio == NULL) {
+#if LP64_DEBUG
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+#endif /* LP64_DEBUG */
+ return;
+ }
+
+ a_uio->uio_procp = a_proc_t;
+ return;
+}
+#endif // obsolete
+
+/*
+ * uio_curriovbase - return the base address of the current iovec associated
+ * with the given uio_t. May return 0.
+ */
+user_addr_t uio_curriovbase( uio_t a_uio )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL || a_uio->uio_iovcnt < 1) {
+ return(0);
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+ return(a_uio->uio_iovs.uiovp->iov_base);
+ }
+ return((user_addr_t)((uintptr_t)a_uio->uio_iovs.kiovp->iov_base));
+
+}
+
+/*
+ * uio_curriovlen - return the length value of the current iovec associated
+ * with the given uio_t.
+ */
+user_size_t uio_curriovlen( uio_t a_uio )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL || a_uio->uio_iovcnt < 1) {
+ return(0);
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+ return(a_uio->uio_iovs.uiovp->iov_len);
+ }
+ return((user_size_t)a_uio->uio_iovs.kiovp->iov_len);
+}
+
+/*
+ * uio_setcurriovlen - set the length value of the current iovec associated
+ * with the given uio_t.
+ */
+__private_extern__ void uio_setcurriovlen( uio_t a_uio, user_size_t a_value )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL) {
+ return;
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+ a_uio->uio_iovs.uiovp->iov_len = a_value;
+ }
+ else {
+#if LP64_DEBUG
+ if (a_value > 0xFFFFFFFFull) {
+ panic("%s :%d - invalid a_value\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+ a_uio->uio_iovs.kiovp->iov_len = (size_t)a_value;
+ }
+ return;
+}
+
+/*
+ * uio_iovcnt - return count of active iovecs for the given uio_t
+ */
+int uio_iovcnt( uio_t a_uio )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL) {
+ return(0);
+ }
+
+ return( a_uio->uio_iovcnt );
+}
+
+/*
+ * uio_offset - return the current offset value for the given uio_t
+ */
+off_t uio_offset( uio_t a_uio )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL) {
+ return(0);
+ }
+ return( a_uio->uio_offset );
+}
+
+/*
+ * uio_setoffset - set the current offset value for the given uio_t
+ */
+void uio_setoffset( uio_t a_uio, off_t a_offset )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL) {
+ return;
+ }
+ a_uio->uio_offset = a_offset;
+ return;
+}
+
+/*
+ * uio_rw - return the read / write flag for the given uio_t
+ */
+int uio_rw( uio_t a_uio )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL) {
+ return(-1);
+ }
+ return( a_uio->uio_rw );
+}
+
+/*
+ * uio_setrw - set the read / write flag for the given uio_t
+ */
+void uio_setrw( uio_t a_uio, int a_value )
+{
+ if (a_uio == NULL) {
+#if LP64_DEBUG
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+#endif /* LP64_DEBUG */
+ return;
+ }
+
+#if LP64_DEBUG
+ if (!(a_value == UIO_READ || a_value == UIO_WRITE)) {
+ panic("%s :%d - invalid a_value\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_value == UIO_READ || a_value == UIO_WRITE) {
+ a_uio->uio_rw = a_value;
+ }
+ return;
+}
+
+/*
+ * uio_isuserspace - return non zero value if the address space
+ * flag is for a user address space (could be 32 or 64 bit).
+ */
+int uio_isuserspace( uio_t a_uio )
+{
+ if (a_uio == NULL) {
+#if LP64_DEBUG
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+#endif /* LP64_DEBUG */
+ return(0);
+ }
+
+ if (UIO_SEG_IS_USER_SPACE(a_uio->uio_segflg)) {
+ return( 1 );
+ }
+ return( 0 );
+}
+
+
+/*
+ * uio_create - create an uio_t.
+ * Space is allocated to hold up to a_iovcount number of iovecs. The uio_t
+ * is not fully initialized until all iovecs are added using uio_addiov calls.
+ * a_iovcount is the maximum number of iovecs you may add.
+ */
+uio_t uio_create( int a_iovcount, /* number of iovecs */
+ off_t a_offset, /* current offset */
+ int a_spacetype, /* type of address space */
+ int a_iodirection ) /* read or write flag */
+{
+ void * my_buf_p;
+ int my_size;
+ uio_t my_uio;
+
+ my_size = sizeof(struct uio) + (sizeof(struct user_iovec) * a_iovcount);
+ my_buf_p = kalloc(my_size);
+ my_uio = uio_createwithbuffer( a_iovcount,
+ a_offset,
+ a_spacetype,
+ a_iodirection,
+ my_buf_p,
+ my_size );
+ if (my_uio != 0) {
+ /* leave a note that we allocated this uio_t */
+ my_uio->uio_flags |= UIO_FLAGS_WE_ALLOCED;
+#if DEBUG
+ hw_atomic_add(&uio_t_count, 1);
+#endif
+ }
+
+ return( my_uio );
+}
+
+
+/*
+ * uio_createwithbuffer - create an uio_t.
+ * Create a uio_t using the given buffer. The uio_t
+ * is not fully initialized until all iovecs are added using uio_addiov calls.
+ * a_iovcount is the maximum number of iovecs you may add.
+ * This call may fail if the given buffer is not large enough.
+ */
+__private_extern__ uio_t
+ uio_createwithbuffer( int a_iovcount, /* number of iovecs */
+ off_t a_offset, /* current offset */
+ int a_spacetype, /* type of address space */
+ int a_iodirection, /* read or write flag */
+ void *a_buf_p, /* pointer to a uio_t buffer */
+ int a_buffer_size ) /* size of uio_t buffer */
+{
+ uio_t my_uio = (uio_t) a_buf_p;
+ int my_size;
+
+ my_size = sizeof(struct uio) + (sizeof(struct user_iovec) * a_iovcount);
+ if (a_buffer_size < my_size) {
+#if DEBUG
+ panic("%s :%d - a_buffer_size is too small\n", __FILE__, __LINE__);
+#endif /* DEBUG */
+ return( NULL );
+ }
+ my_size = a_buffer_size;
+
+#if DEBUG
+ if (my_uio == 0) {
+ panic("%s :%d - could not allocate uio_t\n", __FILE__, __LINE__);
+ }
+ if (!IS_VALID_UIO_SEGFLG(a_spacetype)) {
+ panic("%s :%d - invalid address space type\n", __FILE__, __LINE__);
+ }
+ if (!(a_iodirection == UIO_READ || a_iodirection == UIO_WRITE)) {
+ panic("%s :%d - invalid IO direction flag\n", __FILE__, __LINE__);
+ }
+ if (a_iovcount > UIO_MAXIOV) {
+ panic("%s :%d - invalid a_iovcount\n", __FILE__, __LINE__);
+ }
+#endif /* DEBUG */
+
+ bzero(my_uio, my_size);
+ my_uio->uio_size = my_size;
+
+ /* we use uio_segflg to indicate if the uio_t is the new format or */
+ /* old (pre LP64 support) legacy format */
+ switch (a_spacetype) {
+ case UIO_USERSPACE:
+ my_uio->uio_segflg = UIO_USERSPACE32;
+ case UIO_SYSSPACE:
+ my_uio->uio_segflg = UIO_SYSSPACE32;
+ case UIO_PHYS_USERSPACE:
+ my_uio->uio_segflg = UIO_PHYS_USERSPACE32;
+ case UIO_PHYS_SYSSPACE:
+ my_uio->uio_segflg = UIO_PHYS_SYSSPACE32;
+ default:
+ my_uio->uio_segflg = a_spacetype;
+ break;
+ }
+
+ if (a_iovcount > 0) {
+ my_uio->uio_iovs.uiovp = (struct user_iovec *)
+ (((uint8_t *)my_uio) + sizeof(struct uio));
+ }
+ else {
+ my_uio->uio_iovs.uiovp = NULL;
+ }
+
+ my_uio->uio_max_iovs = a_iovcount;
+ my_uio->uio_offset = a_offset;
+ my_uio->uio_rw = a_iodirection;
+ my_uio->uio_flags = UIO_FLAGS_INITED;
+
+ return( my_uio );
+}
+
+/*
+ * uio_spacetype - return the address space type for the given uio_t
+ */
+int uio_spacetype( uio_t a_uio )
+{
+ if (a_uio == NULL) {
+#if LP64_DEBUG
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+#endif /* LP64_DEBUG */
+ return(-1);
+ }
+
+ return( a_uio->uio_segflg );
+}
+
+/*
+ * uio_iovsaddr - get the address of the iovec array for the given uio_t.
+ * This returns the location of the iovecs within the uio.
+ * NOTE - for compatibility mode we just return the current value in uio_iovs
+ * which will increase as the IO is completed and is NOT embedded within the
+ * uio, it is a seperate array of one or more iovecs.
+ */
+struct user_iovec * uio_iovsaddr( uio_t a_uio )
+{
+ struct user_iovec * my_addr;
+
+ if (a_uio == NULL) {
+ return(NULL);
+ }
+
+ if (a_uio->uio_segflg == UIO_USERSPACE || a_uio->uio_segflg == UIO_SYSSPACE) {
+ /* we need this for compatibility mode. */
+ my_addr = (struct user_iovec *) a_uio->uio_iovs.iovp;
+ }
+ else {
+ my_addr = (struct user_iovec *) (((uint8_t *)a_uio) + sizeof(struct uio));
+ }
+ return(my_addr);
+}
+
+/*
+ * uio_reset - reset an uio_t.
+ * Reset the given uio_t to initial values. The uio_t is not fully initialized
+ * until all iovecs are added using uio_addiov calls.
+ * The a_iovcount value passed in the uio_create is the maximum number of
+ * iovecs you may add.
+ */
+void uio_reset( uio_t a_uio,
+ off_t a_offset, /* current offset */
+ int a_spacetype, /* type of address space */
+ int a_iodirection ) /* read or write flag */
+{
+ vm_size_t my_size;
+ int my_max_iovs;
+ u_int32_t my_old_flags;
+
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - could not allocate uio_t\n", __FILE__, __LINE__);
+ }
+ if (!IS_VALID_UIO_SEGFLG(a_spacetype)) {
+ panic("%s :%d - invalid address space type\n", __FILE__, __LINE__);
+ }
+ if (!(a_iodirection == UIO_READ || a_iodirection == UIO_WRITE)) {
+ panic("%s :%d - invalid IO direction flag\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL) {
+ return;
+ }
+
+ my_size = a_uio->uio_size;
+ my_old_flags = a_uio->uio_flags;
+ my_max_iovs = a_uio->uio_max_iovs;
+ bzero(a_uio, my_size);
+ a_uio->uio_size = my_size;
+ a_uio->uio_segflg = a_spacetype;
+ if (my_max_iovs > 0) {
+ a_uio->uio_iovs.uiovp = (struct user_iovec *)
+ (((uint8_t *)a_uio) + sizeof(struct uio));
+ }
+ else {
+ a_uio->uio_iovs.uiovp = NULL;
+ }
+ a_uio->uio_max_iovs = my_max_iovs;
+ a_uio->uio_offset = a_offset;
+ a_uio->uio_rw = a_iodirection;
+ a_uio->uio_flags = my_old_flags;
+
+ return;
+}
+
+/*
+ * uio_free - free a uio_t allocated via uio_init. this also frees all
+ * associated iovecs.
+ */
+void uio_free( uio_t a_uio )
+{
+#if DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - passing NULL uio_t\n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio != NULL && (a_uio->uio_flags & UIO_FLAGS_WE_ALLOCED) != 0) {
+#if DEBUG
+ if ((int)(hw_atomic_sub(&uio_t_count, 1)) < 0) {
+ panic("%s :%d - uio_t_count has gone negative\n", __FILE__, __LINE__);
+ }
+#endif
+ kfree(a_uio, a_uio->uio_size);
+ }
+
+
+}
+
+/*
+ * uio_addiov - add an iovec to the given uio_t. You may call this up to
+ * the a_iovcount number that was passed to uio_create. This call will
+ * increment the residual IO count as iovecs are added to the uio_t.
+ * returns 0 if add was successful else non zero.
+ */
+int uio_addiov( uio_t a_uio, user_addr_t a_baseaddr, user_size_t a_length )
+{
+ int i;
+
+ if (a_uio == NULL) {
+#if DEBUG
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+#endif /* LP64_DEBUG */
+ return(-1);
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+ for ( i = 0; i < a_uio->uio_max_iovs; i++ ) {
+ if (a_uio->uio_iovs.uiovp[i].iov_len == 0 && a_uio->uio_iovs.uiovp[i].iov_base == 0) {
+ a_uio->uio_iovs.uiovp[i].iov_len = a_length;
+ a_uio->uio_iovs.uiovp[i].iov_base = a_baseaddr;
+ a_uio->uio_iovcnt++;
+#if 1 // LP64todo - remove this temp workaround once we go live with uio KPI
+ a_uio->uio_resid += a_length;
+#else
+ a_uio->uio_resid_64 += a_length;
+#endif
+ return( 0 );
+ }
+ }
+ }
+ else {
+ for ( i = 0; i < a_uio->uio_max_iovs; i++ ) {
+ if (a_uio->uio_iovs.kiovp[i].iov_len == 0 && a_uio->uio_iovs.kiovp[i].iov_base == 0) {
+ a_uio->uio_iovs.kiovp[i].iov_len = (u_int32_t)a_length;
+ a_uio->uio_iovs.kiovp[i].iov_base = (u_int32_t)((uintptr_t)a_baseaddr);
+ a_uio->uio_iovcnt++;
+ a_uio->uio_resid += a_length;
+ return( 0 );
+ }
+ }
+ }
+
+ return( -1 );
+}
+
+/*
+ * uio_getiov - get iovec data associated with the given uio_t. Use
+ * a_index to iterate over each iovec (0 to (uio_iovcnt(uio_t) - 1)).
+ * a_baseaddr_p and a_length_p may be NULL.
+ * returns -1 when a_index is >= uio_t.uio_iovcnt or invalid uio_t.
+ * returns 0 when data is returned.
+ */
+int uio_getiov( uio_t a_uio,
+ int a_index,
+ user_addr_t * a_baseaddr_p,
+ user_size_t * a_length_p )
+{
+ if (a_uio == NULL) {
+#if DEBUG
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+#endif /* DEBUG */
+ return(-1);
+ }
+ if ( a_index < 0 || a_index >= a_uio->uio_iovcnt) {
+ return(-1);
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+ if (a_baseaddr_p != NULL) {
+ *a_baseaddr_p = a_uio->uio_iovs.uiovp[a_index].iov_base;
+ }
+ if (a_length_p != NULL) {
+ *a_length_p = a_uio->uio_iovs.uiovp[a_index].iov_len;
+ }
+ }
+ else {
+ if (a_baseaddr_p != NULL) {
+ *a_baseaddr_p = a_uio->uio_iovs.kiovp[a_index].iov_base;
+ }
+ if (a_length_p != NULL) {
+ *a_length_p = a_uio->uio_iovs.kiovp[a_index].iov_len;
+ }
+ }
+
+ return( 0 );
+}
+
+/*
+ * uio_calculateresid - runs through all iovecs associated with this
+ * uio_t and calculates (and sets) the residual IO count.
+ */
+__private_extern__ void uio_calculateresid( uio_t a_uio )
+{
+ int i;
+
+ if (a_uio == NULL) {
+#if LP64_DEBUG
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+#endif /* LP64_DEBUG */
+ return;
+ }
+
+ a_uio->uio_iovcnt = a_uio->uio_max_iovs;
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+#if 1 // LP64todo - remove this temp workaround once we go live with uio KPI
+ a_uio->uio_resid = 0;
+#else
+ a_uio->uio_resid_64 = 0;
+#endif
+ for ( i = 0; i < a_uio->uio_max_iovs; i++ ) {
+ if (a_uio->uio_iovs.uiovp[i].iov_len != 0 && a_uio->uio_iovs.uiovp[i].iov_base != 0) {
+#if 1 // LP64todo - remove this temp workaround once we go live with uio KPI
+ a_uio->uio_resid += a_uio->uio_iovs.uiovp[i].iov_len;
+#else
+ a_uio->uio_resid_64 += a_uio->uio_iovs.uiovp[i].iov_len;
+#endif
+ }
+ }
+
+ /* position to first non zero length iovec (4235922) */
+ while (a_uio->uio_iovcnt > 0 && a_uio->uio_iovs.uiovp->iov_len == 0) {
+ a_uio->uio_iovcnt--;
+ if (a_uio->uio_iovcnt > 0) {
+ a_uio->uio_iovs.uiovp++;
+ }
+ }
+ }
+ else {
+ a_uio->uio_resid = 0;
+ for ( i = 0; i < a_uio->uio_max_iovs; i++ ) {
+ if (a_uio->uio_iovs.kiovp[i].iov_len != 0 && a_uio->uio_iovs.kiovp[i].iov_base != 0) {
+ a_uio->uio_resid += a_uio->uio_iovs.kiovp[i].iov_len;
+ }
+ }
+
+ /* position to first non zero length iovec (4235922) */
+ while (a_uio->uio_iovcnt > 0 && a_uio->uio_iovs.kiovp->iov_len == 0) {
+ a_uio->uio_iovcnt--;
+ if (a_uio->uio_iovcnt > 0) {
+ a_uio->uio_iovs.kiovp++;
+ }
+ }
+ }
+
+ return;
+}
+
+/*
+ * uio_update - update the given uio_t for a_count of completed IO.
+ * This call decrements the current iovec length and residual IO value
+ * and increments the current iovec base address and offset value.
+ * If the current iovec length is 0 then advance to the next
+ * iovec (if any).
+ * If the a_count passed in is 0, than only do the advancement
+ * over any 0 length iovec's.
+ */
+void uio_update( uio_t a_uio, user_size_t a_count )
+{
+#if LP64_DEBUG
+ if (a_uio == NULL) {
+ panic("%s :%d - invalid uio_t\n", __FILE__, __LINE__);
+ }
+ if (UIO_IS_32_BIT_SPACE(a_uio) && a_count > 0xFFFFFFFFull) {
+ panic("%s :%d - invalid count value \n", __FILE__, __LINE__);
+ }
+#endif /* LP64_DEBUG */
+
+ if (a_uio == NULL || a_uio->uio_iovcnt < 1) {
+ return;
+ }
+
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+ /*
+ * if a_count == 0, then we are asking to skip over
+ * any empty iovs
+ */
+ if (a_count) {
+ if (a_count > a_uio->uio_iovs.uiovp->iov_len) {
+ a_uio->uio_iovs.uiovp->iov_base += a_uio->uio_iovs.uiovp->iov_len;
+ a_uio->uio_iovs.uiovp->iov_len = 0;
+ }
+ else {
+ a_uio->uio_iovs.uiovp->iov_base += a_count;
+ a_uio->uio_iovs.uiovp->iov_len -= a_count;
+ }
+#if 1 // LP64todo - remove this temp workaround once we go live with uio KPI
+ if (a_uio->uio_resid < 0) {
+ a_uio->uio_resid = 0;
+ }
+ if (a_count > (user_size_t)a_uio->uio_resid) {
+ a_uio->uio_offset += a_uio->uio_resid;
+ a_uio->uio_resid = 0;
+ }
+ else {
+ a_uio->uio_offset += a_count;
+ a_uio->uio_resid -= a_count;
+ }
+#else
+ if (a_uio->uio_resid_64 < 0) {
+ a_uio->uio_resid_64 = 0;
+ }
+ if (a_count > (user_size_t)a_uio->uio_resid_64) {
+ a_uio->uio_offset += a_uio->uio_resid_64;
+ a_uio->uio_resid_64 = 0;
+ }
+ else {
+ a_uio->uio_offset += a_count;
+ a_uio->uio_resid_64 -= a_count;
+ }
+#endif // LP64todo
+ }
+ /*
+ * advance to next iovec if current one is totally consumed
+ */
+ while (a_uio->uio_iovcnt > 0 && a_uio->uio_iovs.uiovp->iov_len == 0) {
+ a_uio->uio_iovcnt--;
+ if (a_uio->uio_iovcnt > 0) {
+ a_uio->uio_iovs.uiovp++;
+ }
+ }
+ }
+ else {
+ /*
+ * if a_count == 0, then we are asking to skip over
+ * any empty iovs
+ */
+ if (a_count) {
+ if (a_count > a_uio->uio_iovs.kiovp->iov_len) {
+ a_uio->uio_iovs.kiovp->iov_base += a_uio->uio_iovs.kiovp->iov_len;
+ a_uio->uio_iovs.kiovp->iov_len = 0;
+ }
+ else {
+ a_uio->uio_iovs.kiovp->iov_base += a_count;
+ a_uio->uio_iovs.kiovp->iov_len -= a_count;
+ }
+ if (a_uio->uio_resid < 0) {
+ a_uio->uio_resid = 0;
+ }
+ if (a_count > (user_size_t)a_uio->uio_resid) {
+ a_uio->uio_offset += a_uio->uio_resid;
+ a_uio->uio_resid = 0;
+ }
+ else {
+ a_uio->uio_offset += a_count;
+ a_uio->uio_resid -= a_count;
+ }
+ }
+ /*
+ * advance to next iovec if current one is totally consumed
+ */
+ while (a_uio->uio_iovcnt > 0 && a_uio->uio_iovs.kiovp->iov_len == 0) {
+ a_uio->uio_iovcnt--;
+ if (a_uio->uio_iovcnt > 0) {
+ a_uio->uio_iovs.kiovp++;
+ }
+ }
+ }
+ return;
+}
+
+
+/*
+ * uio_duplicate - allocate a new uio and make a copy of the given uio_t.
+ * may return NULL.
+ */
+uio_t uio_duplicate( uio_t a_uio )
+{
+ uio_t my_uio;
+ int i;
+
+ if (a_uio == NULL) {
+ return(NULL);
+ }
+
+ my_uio = (uio_t) kalloc(a_uio->uio_size);
+ if (my_uio == 0) {
+ panic("%s :%d - allocation failed\n", __FILE__, __LINE__);
+ }
+
+ bcopy((void *)a_uio, (void *)my_uio, a_uio->uio_size);
+ /* need to set our iovec pointer to point to first active iovec */
+ if (my_uio->uio_max_iovs > 0) {
+ my_uio->uio_iovs.uiovp = (struct user_iovec *)
+ (((uint8_t *)my_uio) + sizeof(struct uio));
+
+ /* advance to first nonzero iovec */
+ if (my_uio->uio_iovcnt > 0) {
+ for ( i = 0; i < my_uio->uio_max_iovs; i++ ) {
+ if (UIO_IS_64_BIT_SPACE(a_uio)) {
+ if (my_uio->uio_iovs.uiovp->iov_len != 0) {
+ break;
+ }
+ my_uio->uio_iovs.uiovp++;
+ }
+ else {
+ if (my_uio->uio_iovs.kiovp->iov_len != 0) {
+ break;
+ }
+ my_uio->uio_iovs.kiovp++;
+ }
+ }
+ }
+ }
+
+ return(my_uio);
+}
+
projects / apple / xnu.git / blobdiff