1 /* 2 * Copyright 2004-2008, Haiku Inc. All rights reserved. 3 * Distributed under the terms of the MIT license. 4 * 5 * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved. 6 * Distributed under the terms of the NewOS License. 7 */ 8 #ifndef _KERNEL_ARCH_x86_KERNEL_H 9 #define _KERNEL_ARCH_x86_KERNEL_H 10 11 12 #ifndef _ASSEMBLER 13 # include <arch/cpu.h> 14 #endif 15 16 17 #ifdef _BOOT_MODE 18 19 20 // 32-bit and 64-bit kernel load addresses. 21 #define KERNEL_LOAD_BASE 0x80000000 22 #define KERNEL_LOAD_BASE_64_BIT 0xffffffff80000000ll 23 24 25 #elif defined(__x86_64__) 26 27 28 // Base of the kernel address space. 29 // KERNEL_BASE is the base of the kernel address space. This differs from the 30 // address where the kernel is loaded to: the kernel is loaded in the top 2GB 31 // of the virtual address space as required by GCC's kernel code model. The 32 // whole kernel address space is the top 512GB of the address space. 33 #define KERNEL_BASE 0xffffff0000000000 34 #define KERNEL_SIZE 0x10000000000 35 #define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1)) 36 #define KERNEL_LOAD_BASE 0xffffffff80000000 37 38 // Kernel physical memory map area. 39 #define KERNEL_PMAP_BASE 0xffffff0000000000 40 #define KERNEL_PMAP_SIZE 0x8000000000 41 42 // Userspace address space layout. 43 // There is a 2MB hole just before the end of the bottom half of the address 44 // space. This means that if userland passes in a buffer that crosses into the 45 // uncanonical address region, it will be caught through a page fault. 46 #define USER_BASE 0x0 47 #define USER_BASE_ANY 0x100000 48 #define USER_SIZE (0x800000000000 - 0x200000) 49 #define USER_TOP (USER_BASE + (USER_SIZE - 1)) 50 51 #define KERNEL_USER_DATA_BASE 0x7f0000000000 52 #define USER_STACK_REGION 0x7f0000000000 53 #define USER_STACK_REGION_SIZE ((USER_TOP - USER_STACK_REGION) + 1) 54 55 56 #else // __x86_64__ 57 58 59 // memory layout 60 #define KERNEL_BASE 0x80000000 61 #define KERNEL_SIZE 0x80000000 62 #define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1)) 63 64 /* User space layout is a little special: 65 * The user space does not completely cover the space not covered by the 66 * kernel. There is a gap of 64kb between the user and kernel space. The 64kb 67 * region assures a user space thread cannot pass a buffer into the kernel as 68 * part of a syscall that would cross into kernel space. 69 * Furthermore no areas are placed in the lower 1Mb unless the application 70 * explicitly requests it to find null pointer references. 71 * TODO: introduce the 1Mb lower barrier again - it's only used for vm86 mode, 72 * and this should be moved into the kernel (and address space) completely. 73 */ 74 #define USER_BASE 0x0 75 #define USER_BASE_ANY 0x100000 76 #define USER_SIZE (KERNEL_BASE - 0x10000) 77 #define USER_TOP (USER_BASE + (USER_SIZE - 1)) 78 79 #define KERNEL_USER_DATA_BASE 0x60000000 80 #define USER_STACK_REGION 0x70000000 81 #define USER_STACK_REGION_SIZE ((USER_TOP - USER_STACK_REGION) + 1) 82 83 84 #endif // __x86_64__ 85 86 #endif // _KERNEL_ARCH_x86_KERNEL_H 87