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Paul Mackerras bf72aeba2f powerpc: Use 64k pages without needing cache-inhibited large pages ... Some POWER5+ machines can do 64k hardware pages for normal memory but not for cache-inhibited pages. This patch lets us use 64k hardware pages for most user processes on such machines (assuming the kernel has been configured with CONFIG_PPC_64K_PAGES=y). User processes start out using 64k pages and get switched to 4k pages if they use any non-cacheable mappings. With this, we use 64k pages for the vmalloc region and 4k pages for the imalloc region. If anything creates a non-cacheable mapping in the vmalloc region, the vmalloc region will get switched to 4k pages. I don't know of any driver other than the DRM that would do this, though, and these machines don't have AGP. When a region gets switched from 64k pages to 4k pages, we do not have to clear out all the 64k HPTEs from the hash table immediately. We use the _PAGE_COMBO bit in the Linux PTE to indicate whether the page was hashed in as a 64k page or a set of 4k pages. If hash_page is trying to insert a 4k page for a Linux PTE and it sees that it has already been inserted as a 64k page, it first invalidates the 64k HPTE before inserting the 4k HPTE. The hash invalidation routines also use the _PAGE_COMBO bit, to determine whether to look for a 64k HPTE or a set of 4k HPTEs to remove. With those two changes, we can tolerate a mix of 4k and 64k HPTEs in the hash table, and they will all get removed when the address space is torn down. Signed-off-by: Paul Mackerras <paulus@samba.org>		19 years ago
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4xx_mmu.c	…
44x_mmu.c	…
Makefile	…
fault.c	…
fsl_booke_mmu.c	…
hash_low_32.S	…
hash_low_64.S	powerpc: Use 64k pages without needing cache-inhibited large pages	19 years ago
hash_native_64.c	…
hash_utils_64.c	powerpc: Use 64k pages without needing cache-inhibited large pages	19 years ago
hugetlbpage.c	…
imalloc.c	…
init_32.c	…
init_64.c	…
lmb.c	…
mem.c	…
mmap.c	…
mmu_context_32.c	…
mmu_context_64.c	powerpc: Use 64k pages without needing cache-inhibited large pages	19 years ago
mmu_decl.h	…
numa.c	…
pgtable_32.c	…
pgtable_64.c	…
ppc_mmu_32.c	…
slb.c	powerpc: Use 64k pages without needing cache-inhibited large pages	19 years ago
slb_low.S	powerpc: Use 64k pages without needing cache-inhibited large pages	19 years ago
stab.c	…
tlb_32.c	…
tlb_64.c	powerpc: Use 64k pages without needing cache-inhibited large pages	19 years ago