| Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 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 |
| Benjamin Herrenschmidt | 8d1cf34 | 2009-03-19 19:34:08 +0000 | [diff] [blame] | 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. |
| Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 16 | */ |
| Benjamin Herrenschmidt | 8d1cf34 | 2009-03-19 19:34:08 +0000 | [diff] [blame] | 17 | #define _PAGE_PRESENT 0x0001 /* software: pte contains a translation */ |
| 18 | #define _PAGE_USER 0x0002 /* matches one of the PP bits */ |
| 19 | #define _PAGE_FILE 0x0002 /* (!present only) software: pte holds file offset */ |
| 20 | #define _PAGE_EXEC 0x0004 /* No execute on POWER4 and newer (we invert) */ |
| 21 | #define _PAGE_GUARDED 0x0008 |
| 22 | #define _PAGE_COHERENT 0x0010 /* M: enforce memory coherence (SMP systems) */ |
| 23 | #define _PAGE_NO_CACHE 0x0020 /* I: cache inhibit */ |
| 24 | #define _PAGE_WRITETHRU 0x0040 /* W: cache write-through */ |
| 25 | #define _PAGE_DIRTY 0x0080 /* C: page changed */ |
| 26 | #define _PAGE_ACCESSED 0x0100 /* R: page referenced */ |
| 27 | #define _PAGE_RW 0x0200 /* software: user write access allowed */ |
| 28 | #define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */ |
| 29 | |
| 30 | /* No separate kernel read-only */ |
| 31 | #define _PAGE_KERNEL_RW (_PAGE_RW | _PAGE_DIRTY) /* user access blocked by key */ |
| 32 | #define _PAGE_KERNEL_RO _PAGE_KERNEL_RW |
| Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 33 | |
| 34 | /* Strong Access Ordering */ |
| Benjamin Herrenschmidt | 8d1cf34 | 2009-03-19 19:34:08 +0000 | [diff] [blame] | 35 | #define _PAGE_SAO (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT) |
| Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 36 | |
| Benjamin Herrenschmidt | 8d1cf34 | 2009-03-19 19:34:08 +0000 | [diff] [blame] | 37 | /* No page size encoding in the linux PTE */ |
| 38 | #define _PAGE_PSIZE 0 |
| Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 39 | |
| 40 | /* PTEIDX nibble */ |
| 41 | #define _PTEIDX_SECONDARY 0x8 |
| 42 | #define _PTEIDX_GROUP_IX 0x7 |
| 43 | |
| Benjamin Herrenschmidt | a033a48 | 2009-03-19 19:34:15 +0000 | [diff] [blame] | 44 | /* Hash table based platforms need atomic updates of the linux PTE */ |
| 45 | #define PTE_ATOMIC_UPDATES 1 |
| Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 46 | |
| 47 | #ifdef CONFIG_PPC_64K_PAGES |
| 48 | #include <asm/pte-hash64-64k.h> |
| 49 | #else |
| 50 | #include <asm/pte-hash64-4k.h> |
| 51 | #endif |
| 52 | |
| 53 | #endif /* __KERNEL__ */ |
| 54 | #endif /* _ASM_POWERPC_PTE_HASH64_H */ |