Moved the intelligence whether the driver is supported or not
completely to the BSP, now that bsp.h is included (even though it
is a driver... hmm). The ERC32 was never supported, so HAS_SMC91111
is not added to erc32/include/bsp.h.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
The low level routines can be used in different occasions, it will be
required when accessing PCI.
Note the difference between byteorder.h (inlined functions) and access.S
where the functions will be declared in the library archive librtemscpu.a.
Function names starting with _ are in library and can be referenced by
function pointers.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
The compaction process needs erased blocks. It is only possible to
erase an entire segment. Thus in order to make a progress we always
need enough erased blocks to empty a used or available segment which can
be erased in turn. A (possibly the worst case) lower bound of erased
blocks is the block count of the largest segment. The number of
unavailable blocks specified by the configuration will be used to
determine the erase blocks starvation situation. The number of
unavailable blocks must be greater than or equal to the number of blocks
in the largest segment.
In case rtems_bdbuf_read() returns an error status, the block device
buffer pointer will be set to NULL. In RFS the chain node of the block
device buffer will be used for RFS purposes. We must not do this after
an erroneous read.
The functions
o rtems_bdbuf_get(),
o rtems_bdbuf_read(),
o rtems_bdbuf_syncdev(), and
o rtems_bdbuf_purge_dev(),
use now the disk device instead of the device identifier. This makes
bdbuf independent of rtems_disk_obtain() and rtems_disk_release(). It
is the responsiblity of the file system to obtain the disk device. This
also reduces the overhead to get a buffer.
The key for the AVL tree uses now the disk device instead of the device
identifier. The pointer is interpreted as an unsigned integer. This
reduces the memory overhead and makes the comparison operation a bit
faster.
Removed function rtems_bdbuf_purge_major(). This function was too
destructive and could have unpredictable side effects.
Generic nodes are an alternative to standard drivers in RTEMS. The
handlers of a generic node are called with less overhead compared to the
standard driver operations. The usage of file system node handlers
enable more features like support for fsync() and fdatasync(). The
generic nodes use the reference counting of the IMFS. This provides
automatic node destruction when the last reference vanishes.
Extend type IMFS_types_union by new type IMFS_generic_t.
Extend enum IMFS_jnode_types_t by IMFS_GENERIC.
Add functions
o IMFS_make_generic_node(),
o IMFS_is_imfs_instance(),
o IMFS_generic_get_context_by_node(),
o IMFS_generic_get_context_by_location(), and
o IMFS_generic_get_context_by_iop().
New test fstests/fsimfsgeneric01.
Add and use structure IMFS_node_control with support functions. This
helps to make high level functions independent of the node type and
reduces the number of branches in the code.
Sebastian Huber
Daniel Hellstrom
Jennifer Averett
Gedare Bloom