1 #ifndef _ASM_POWERPC_PAGE_64_H 2 #define _ASM_POWERPC_PAGE_64_H 3 4 /* 5 * Copyright (C) 2001 PPC64 Team, IBM Corp 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #include <asm/asm-const.h> 14 15 /* 16 * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux 17 * specific, every notion of page number shared with the firmware, TCEs, 18 * iommu, etc... still uses a page size of 4K. 19 */ 20 #define HW_PAGE_SHIFT 12 21 #define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT) 22 #define HW_PAGE_MASK (~(HW_PAGE_SIZE-1)) 23 24 /* 25 * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and 26 * HW_PAGE_SHIFT, that is 4K pages. 27 */ 28 #define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT) 29 30 /* Segment size; normal 256M segments */ 31 #define SID_SHIFT 28 32 #define SID_MASK ASM_CONST(0xfffffffff) 33 #define ESID_MASK 0xfffffffff0000000UL 34 #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK) 35 36 /* 1T segments */ 37 #define SID_SHIFT_1T 40 38 #define SID_MASK_1T 0xffffffUL 39 #define ESID_MASK_1T 0xffffff0000000000UL 40 #define GET_ESID_1T(x) (((x) >> SID_SHIFT_1T) & SID_MASK_1T) 41 42 #ifndef __ASSEMBLY__ 43 #include <asm/cache.h> 44 45 typedef unsigned long pte_basic_t; 46 47 static inline void clear_page(void *addr) 48 { 49 unsigned long iterations; 50 unsigned long onex, twox, fourx, eightx; 51 52 iterations = ppc64_caches.l1d.blocks_per_page / 8; 53 54 /* 55 * Some verisions of gcc use multiply instructions to 56 * calculate the offsets so lets give it a hand to 57 * do better. 58 */ 59 onex = ppc64_caches.l1d.block_size; 60 twox = onex << 1; 61 fourx = onex << 2; 62 eightx = onex << 3; 63 64 asm volatile( 65 "mtctr %1 # clear_page\n\ 66 .balign 16\n\ 67 1: dcbz 0,%0\n\ 68 dcbz %3,%0\n\ 69 dcbz %4,%0\n\ 70 dcbz %5,%0\n\ 71 dcbz %6,%0\n\ 72 dcbz %7,%0\n\ 73 dcbz %8,%0\n\ 74 dcbz %9,%0\n\ 75 add %0,%0,%10\n\ 76 bdnz+ 1b" 77 : "=&r" (addr) 78 : "r" (iterations), "0" (addr), "b" (onex), "b" (twox), 79 "b" (twox+onex), "b" (fourx), "b" (fourx+onex), 80 "b" (twox+fourx), "b" (eightx-onex), "r" (eightx) 81 : "ctr", "memory"); 82 } 83 84 extern void copy_page(void *to, void *from); 85 86 /* Log 2 of page table size */ 87 extern u64 ppc64_pft_size; 88 89 #endif /* __ASSEMBLY__ */ 90 91 #define VM_DATA_DEFAULT_FLAGS \ 92 (is_32bit_task() ? \ 93 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64) 94 95 /* 96 * This is the default if a program doesn't have a PT_GNU_STACK 97 * program header entry. The PPC64 ELF ABI has a non executable stack 98 * stack by default, so in the absence of a PT_GNU_STACK program header 99 * we turn execute permission off. 100 */ 101 #define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ 102 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 103 104 #define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ 105 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 106 107 #define VM_STACK_DEFAULT_FLAGS \ 108 (is_32bit_task() ? \ 109 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64) 110 111 #include <asm-generic/getorder.h> 112 113 #endif /* _ASM_POWERPC_PAGE_64_H */ 114