scottl 005db7b747 Implement bus_dmamem_alloc_size() and bus_dmamem_free_size() as ... counterparts to bus_dmamem_alloc() and bus_dmamem_free(). This allows the caller to specify the size of the allocation instead of it defaulting to the max_size field of the busdma tag. This is intended to aid in converting drivers to busdma. Lots of hardware cannot understand scatter/gather lists, which forces the driver to copy the i/o buffers to a single contiguous region before sending it to the hardware. Without these new methods, this would require a new busdma tag for each operation, or a complex internal allocator/cache for each driver. Allocations greater than PAGE_SIZE are rounded up to the next PAGE_SIZE by contigmalloc(), so this is not suitable for multiple static allocations that would be better served by a single fixed-length subdivided allocation. Reviewed by: jake (sparc64)		2003-01-29 07:25:27 +00:00
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ofw_sbus.h
sbus.c	Implement bus_dmamem_alloc_size() and bus_dmamem_free_size() as	2003-01-29 07:25:27 +00:00
sbusreg.h
sbusvar.h	Typo fix.	2002-08-19 22:57:32 +00:00