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[PATCH] ppc64: Abolish ioremap_mm

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Currently ppc64 has two mm_structs for the kernel, init_mm and also
ioremap_mm.  The latter really isn't necessary: this patch abolishes it,
instead restricting vmallocs to the lower 1TB of the init_mm's range and
placing io mappings in the upper 1TB.  This simplifies the code in a number
of places and eliminates an unecessary set of pagetables.  It also tweaks
the unmap/free path a little, allowing us to remove the unmap_im_area() set
of page table walkers, replacing them with unmap_vm_area().

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Gibson
2005-06-21 17:15:31 -07:00
committed by Linus Torvalds
parent 6879dc137e
commit 20cee16ced
10 changed files with 31 additions and 133 deletions
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12
include/asm-ppc64/imalloc.h
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@@ -4,9 +4,9 @@
/*
* Define the address range of the imalloc VM area.
*/
#define PHBS_IO_BASE IOREGIONBASE
#define IMALLOC_BASE (IOREGIONBASE + 0x80000000ul) /* Reserve 2 gigs for PHBs */
#define IMALLOC_END (IOREGIONBASE + EADDR_MASK)
#define PHBS_IO_BASE VMALLOC_END
#define IMALLOC_BASE (PHBS_IO_BASE + 0x80000000ul) /* Reserve 2 gigs for PHBs */
#define IMALLOC_END (VMALLOC_START + EADDR_MASK)
/* imalloc region types */
@@ -18,7 +18,9 @@
extern struct vm_struct * im_get_free_area(unsigned long size);
extern struct vm_struct * im_get_area(unsigned long v_addr, unsigned long size,
int region_type);
unsigned long im_free(void *addr);
int region_type);
extern void im_free(void *addr);
extern unsigned long ioremap_bot;
#endif /* _PPC64_IMALLOC_H */