1 /* 2 * Memory layout definitions for the Hexagon architecture 3 * 4 * Copyright (c) 2010-2011, 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 * LOAD_ADDRESS is the physical/linear address of where in memory 36 * the kernel gets loaded. The 12 least significant bits must be zero (0) 37 * due to limitations on setting the EVB 38 * 39 */ 40 41 #ifndef LOAD_ADDRESS 42 #define LOAD_ADDRESS 0x00000000 43 #endif 44 45 #define TASK_SIZE (PAGE_OFFSET) 46 47 /* not sure how these are used yet */ 48 #define STACK_TOP TASK_SIZE 49 #define STACK_TOP_MAX TASK_SIZE 50 51 #ifndef __ASSEMBLY__ 52 enum fixed_addresses { 53 FIX_KMAP_BEGIN, 54 FIX_KMAP_END, /* check for per-cpuism */ 55 __end_of_fixed_addresses 56 }; 57 58 #define MIN_KERNEL_SEG 0x300 /* From 0xc0000000 */ 59 extern int max_kernel_seg; 60 61 /* 62 * Start of vmalloc virtual address space for kernel; 63 * supposed to be based on the amount of physical memory available 64 */ 65 66 #define VMALLOC_START (PAGE_OFFSET + VMALLOC_OFFSET + \ 67 (unsigned long)high_memory) 68 69 /* Gap between physical ram and vmalloc space for guard purposes. */ 70 #define VMALLOC_OFFSET PAGE_SIZE 71 72 /* 73 * Create the space between VMALLOC_START and FIXADDR_TOP backwards 74 * from the ... "top". 75 * 76 * Permanent IO mappings will live at 0xfexx_xxxx 77 * Hypervisor occupies the last 16MB page at 0xffxxxxxx 78 */ 79 80 #define FIXADDR_TOP 0xfe000000 81 #define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) 82 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 83 84 /* 85 * "permanent kernel mappings", defined as long-lasting mappings of 86 * high-memory page frames into the kernel address space. 87 */ 88 89 #define LAST_PKMAP PTRS_PER_PTE 90 #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 91 #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) 92 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 93 94 /* 95 * To the "left" of the fixed map space is the kmap space 96 * 97 * "Permanent Kernel Mappings"; fancy (or less fancy) PTE table 98 * that looks like it's actually walked. 99 * Need to check the alignment/shift usage; some archs use 100 * PMD_MASK on this value 101 */ 102 #define PKMAP_BASE (FIXADDR_START-PAGE_SIZE*LAST_PKMAP) 103 104 /* 105 * 2 pages of guard gap between where vmalloc area ends 106 * and pkmap_base begins. 107 */ 108 #define VMALLOC_END (PKMAP_BASE-PAGE_SIZE*2) 109 #endif /* !__ASSEMBLY__ */ 110 111 112 #endif /* _ASM_HEXAGON_MEM_LAYOUT_H */ 113