1/* 2 * Memory layout definitions for the Hexagon architecture 3 * 4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 and 8 * only version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA. 19 */ 20 21#ifndef _ASM_HEXAGON_MEM_LAYOUT_H 22#define _ASM_HEXAGON_MEM_LAYOUT_H 23 24#include <linux/const.h> 25 26/* 27 * Have to do this for ginormous numbers, else they get printed as 28 * negative numbers, which the linker no likey when you try to 29 * assign it to the location counter. 30 */ 31 32#define PAGE_OFFSET _AC(0xc0000000, UL) 33 34/* 35 * Compiling for a platform that needs a crazy physical offset 36 * (like if the memory starts at 1GB and up) means we need 37 * an actual PHYS_OFFSET. Should be set up in head.S. 38 */ 39 40#ifdef CONFIG_HEXAGON_PHYS_OFFSET 41#ifndef __ASSEMBLY__ 42extern unsigned long __phys_offset; 43#endif 44#define PHYS_OFFSET __phys_offset 45#endif 46 47#ifndef PHYS_OFFSET 48#define PHYS_OFFSET 0 49#endif 50 51#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 52#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 53 54#define TASK_SIZE (PAGE_OFFSET) 55 56/* not sure how these are used yet */ 57#define STACK_TOP TASK_SIZE 58#define STACK_TOP_MAX TASK_SIZE 59 60#ifndef __ASSEMBLY__ 61enum fixed_addresses { 62 FIX_KMAP_BEGIN, 63 FIX_KMAP_END, /* check for per-cpuism */ 64 __end_of_fixed_addresses 65}; 66 67#define MIN_KERNEL_SEG (PAGE_OFFSET >> PGDIR_SHIFT) /* L1 shift is 22 bits */ 68extern int max_kernel_seg; 69 70/* 71 * Start of vmalloc virtual address space for kernel; 72 * supposed to be based on the amount of physical memory available 73 */ 74 75#define VMALLOC_START ((unsigned long) __va(high_memory + VMALLOC_OFFSET)) 76 77/* Gap between physical ram and vmalloc space for guard purposes. */ 78#define VMALLOC_OFFSET PAGE_SIZE 79 80/* 81 * Create the space between VMALLOC_START and FIXADDR_TOP backwards 82 * from the ... "top". 83 * 84 * Permanent IO mappings will live at 0xfexx_xxxx 85 * Hypervisor occupies the last 16MB page at 0xffxxxxxx 86 */ 87 88#define FIXADDR_TOP 0xfe000000 89#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 90#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 91 92/* 93 * "permanent kernel mappings", defined as long-lasting mappings of 94 * high-memory page frames into the kernel address space. 95 */ 96 97#define LAST_PKMAP PTRS_PER_PTE 98#define LAST_PKMAP_MASK (LAST_PKMAP - 1) 99#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) 100#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 101 102/* 103 * To the "left" of the fixed map space is the kmap space 104 * 105 * "Permanent Kernel Mappings"; fancy (or less fancy) PTE table 106 * that looks like it's actually walked. 107 * Need to check the alignment/shift usage; some archs use 108 * PMD_MASK on this value 109 */ 110#define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP) 111 112/* 113 * 2 pages of guard gap between where vmalloc area ends 114 * and pkmap_base begins. 115 */ 116#define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2) 117#endif /* !__ASSEMBLY__ */ 118 119 120#endif /* _ASM_HEXAGON_MEM_LAYOUT_H */ 121