2005-04-16 16:20:36 -06:00
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#ifndef _M68K_ATARI_STRAM_H
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#define _M68K_ATARI_STRAM_H
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/*
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* Functions for Atari ST-RAM management
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*/
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/* public interface */
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m68k/atari: Reserve some ST-RAM early on for device buffer use
Based on an original patch from Michael Schmitz:
Because mem_init() is now called before device init, devices that rely on
ST-RAM may find all ST-RAM already allocated to other users by the time
device init happens. In particular, a large initrd RAM disk may use up
enough of ST-RAM to cause atari_stram_alloc() to resort to
__get_dma_pages() allocation.
In the current state of Atari memory management, all of RAM is marked
DMA capable, so __get_dma_pages() may well return RAM that is not in actual
fact DMA capable. Using this for frame buffer or SCSI DMA buffer causes
subtle failure.
The ST-RAM allocator has been changed to allocate memory from a pool of
reserved ST-RAM of configurable size, set aside on ST-RAM init (i.e.
before mem_init()). As long as this pool is not exhausted, allocation of
real ST-RAM can be guaranteed.
Other changes:
- Replace the custom allocator in the ST-RAM pool by the existing allocator
in the resource subsystem,
- Remove mem_init_done and its hook, as memory init is now done before
device init,
- Remove /proc/stram, as ST-RAM usage now shows up under /proc/iomem, e.g.
005f2000-006f1fff : ST-RAM Pool
005f2000-0063dfff : atafb
0063e000-00641fff : ataflop
00642000-00642fff : SCSI
Signed-off-by: Michael Schmitz <schmitz@debian.org>
[Andreas Schwab <schwab@linux-m68k.org>: Use memparse()]
[Geert: Use the resource subsystem instead of a custom allocator]
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2010-11-01 12:54:00 -06:00
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void *atari_stram_alloc(unsigned long size, const char *owner);
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2005-04-16 16:20:36 -06:00
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void atari_stram_free(void *);
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/* functions called internally by other parts of the kernel */
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void atari_stram_init(void);
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void atari_stram_reserve_pages(void *start_mem);
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#endif /*_M68K_ATARI_STRAM_H */
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