1 #ifndef _ASM_POWERPC_PTE_HASH64_H 2 #define _ASM_POWERPC_PTE_HASH64_H 3 #ifdef __KERNEL__ 4 5 /* 6 * Common bits between 4K and 64K pages in a linux-style PTE. 7 * These match the bits in the (hardware-defined) PowerPC PTE as closely 8 * as possible. Additional bits may be defined in pgtable-hash64-*.h 9 * 10 * Note: We only support user read/write permissions. Supervisor always 11 * have full read/write to pages above PAGE_OFFSET (pages below that 12 * always use the user access permissions). 13 * 14 * We could create separate kernel read-only if we used the 3 PP bits 15 * combinations that newer processors provide but we currently don't. 16 */ 17 #define _PAGE_PRESENT 0x0001 /* software: pte contains a translation */ 18 #define _PAGE_USER 0x0002 /* matches one of the PP bits */ 19 #define _PAGE_EXEC 0x0004 /* No execute on POWER4 and newer (we invert) */ 20 #define _PAGE_GUARDED 0x0008 21 /* We can derive Memory coherence from _PAGE_NO_CACHE */ 22 #define _PAGE_NO_CACHE 0x0020 /* I: cache inhibit */ 23 #define _PAGE_WRITETHRU 0x0040 /* W: cache write-through */ 24 #define _PAGE_DIRTY 0x0080 /* C: page changed */ 25 #define _PAGE_ACCESSED 0x0100 /* R: page referenced */ 26 #define _PAGE_RW 0x0200 /* software: user write access allowed */ 27 #define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */ 28 29 /* No separate kernel read-only */ 30 #define _PAGE_KERNEL_RW (_PAGE_RW | _PAGE_DIRTY) /* user access blocked by key */ 31 #define _PAGE_KERNEL_RO _PAGE_KERNEL_RW 32 33 /* Strong Access Ordering */ 34 #define _PAGE_SAO (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT) 35 36 /* No page size encoding in the linux PTE */ 37 #define _PAGE_PSIZE 0 38 39 /* PTEIDX nibble */ 40 #define _PTEIDX_SECONDARY 0x8 41 #define _PTEIDX_GROUP_IX 0x7 42 43 /* Hash table based platforms need atomic updates of the linux PTE */ 44 #define PTE_ATOMIC_UPDATES 1 45 46 #ifdef CONFIG_PPC_64K_PAGES 47 #include <asm/pte-hash64-64k.h> 48 #else 49 #include <asm/pte-hash64-4k.h> 50 #endif 51 52 #endif /* __KERNEL__ */ 53 #endif /* _ASM_POWERPC_PTE_HASH64_H */ 54