8d1cf34e7a
This patch tweaks the way some PTE bit combinations are defined, in such a way that the 32 and 64-bit variant become almost identical and that will make it easier to bring in a new common pte-* file for the new variant of the Book3-E support. The combination of bits defining access to kernel pages are now clearly separated from the combination used by userspace and the core VM. The resulting generated code should remain identical unless I made a mistake. Note: While at it, I removed a non-sensical statement related to CONFIG_KGDB in ppc_mmu_32.c which could cause kernel mappings to be user accessible when that option is enabled. Probably something that bitrot. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
18 lines
632 B
C
18 lines
632 B
C
/* To be include by pgtable-hash64.h only */
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/* PTE bits */
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#define _PAGE_HASHPTE 0x0400 /* software: pte has an associated HPTE */
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#define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
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#define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */
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#define _PAGE_F_SECOND _PAGE_SECONDARY
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#define _PAGE_F_GIX _PAGE_GROUP_IX
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#define _PAGE_SPECIAL 0x10000 /* software: special page */
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/* PTE flags to conserve for HPTE identification */
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#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
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_PAGE_SECONDARY | _PAGE_GROUP_IX)
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/* shift to put page number into pte */
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#define PTE_RPN_SHIFT (17)
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