XXX the MCA-specific stuff in here was never actually used. I pointed
the tag at all the generic functions that can now be used (bounce
functionality was integrated into them).
in interrupt controllers in struct pic, and try to keep as much
common code as possible. At the lowest (asm) level, this is done
with CPP macros.
The main structure is now struct intrsource, describing an established
interrupt line, of any kind (soft/hard local apic/legacy apic/IO apic).
For quick masking, there may be a maximum of 32 sources per CPU.
Sources can be assigned to any CPU in the MP case, though currently they
all go to the boot CPU.
caveats, but works quite well in a lot of MP cases, and all
UP cases that I have tested. Parts of this will hopefully be
reworked in the not-too-distant future.
* need to specify DMA channel for DMACMD_SET_IO
* the upper byte of port was masked incorrectly
also update comment in _mca_bus_dmamap_sync() to current reality
* add flag to explicitly specify if the DMA should be done as 16bit or 8bit
* add flag to specify the DMA should happen via I/O port
* add new function mca_dma_set_ioport(), to set I/O port to be used for the
DMA operation
Also clarify copyright (welcome to 2001 :), and couple other minor nits
interface, using the code from dev/mca/edc_mca.c:edc_setup_dma()
as a base. Use ISA routines for dmamap/dmamem functions, primarily
to get the buffer bouncing for >16MB RAM machines. The MCA DMA
channel is stored in unused upper 4 bits of ISA DMA cookie's
id_flags, hopefully that's not too disgusting :)
Export mca_dmamap_create(), which returns map suitable for further DMA
operations using MCA DMA controller.
mca_busprobe(): also report if machine has 32bit DMA (feature byte 2
bit 1)
Use symbolic names for DMA controller commands - I've finally got
info what they mean from Tymm Twillman's Linux include/asm/mca_dma.h.
No more magic constants! Also fix bug in the way DMA counter has been
setup - for 16bit DMA, it's necessary to tell the controller _half_
the byte count. This was wrong in the former code.
found in some older IBM PS/2 machines.
This code is based upon work by Scott D. Telford, with some minor bits
in arch/i386/mca/mca_machdep.c taken from FreeBSD.
XXX this is still very experimental and development version; use at your
XXX own risk
fvdl