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 #ifdef __cplusplus 14 # include <arch/cpu.h> 15 #endif 16 #endif 17 18 19 #ifdef _BOOT_MODE 20 21 #ifdef _BOOT_PLATFORM_BIOS 22 #define KERNEL_LOAD_BASE_32_BIT 0x80000000 23 #define KERNEL_LOAD_BASE_64_BIT 0xffffffff80000000ll 24 #define KERNEL_FIXUP_FOR_LONG_MODE (KERNEL_LOAD_BASE_64_BIT - KERNEL_LOAD_BASE_32_BIT) 25 #elif __x86_64__ 26 #define KERNEL_LOAD_BASE 0xffffffff80000000ll 27 #else 28 #define KERNEL_LOAD_BASE 0x80000000 29 #endif 30 31 #elif defined(__x86_64__) 32 33 34 // Base of the kernel address space. 35 // KERNEL_BASE is the base of the kernel address space. This differs from the 36 // address where the kernel is loaded to: the kernel is loaded in the top 2GB 37 // of the virtual address space as required by GCC's kernel code model. The 38 // whole kernel address space is the top 512GB of the address space. 39 #define KERNEL_BASE 0xffffff0000000000 40 #define KERNEL_SIZE 0x10000000000 41 #define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1)) 42 #define KERNEL_LOAD_BASE 0xffffffff80000000 43 44 // Kernel physical memory map area. 45 #define KERNEL_PMAP_BASE 0xffffff0000000000 46 #define KERNEL_PMAP_SIZE 0x8000000000 47 48 // Userspace address space layout. 49 // There is a 2MB hole just before the end of the bottom half of the address 50 // space. This means that if userland passes in a buffer that crosses into the 51 // uncanonical address region, it will be caught through a page fault. 52 #define USER_BASE 0x100000 53 #define USER_BASE_ANY USER_BASE 54 #define USER_SIZE (0x800000000000 - (0x200000 + USER_BASE)) 55 #define USER_TOP (USER_BASE + (USER_SIZE - 1)) 56 57 #define KERNEL_USER_DATA_BASE 0x7f0000000000 58 #define USER_STACK_REGION 0x7f0000000000 59 #define USER_STACK_REGION_SIZE ((USER_TOP - USER_STACK_REGION) + 1) 60 61 #ifdef _COMPAT_MODE 62 63 #define USER32_SIZE 0x100000000 64 #define USER32_TOP (USER_BASE + (USER32_SIZE - 1)) 65 66 #define KERNEL_USER32_DATA_BASE 0x60000000 67 68 #define USER32_STACK_REGION 0x70000000 69 #define USER32_STACK_REGION_SIZE ((USER32_TOP - USER32_STACK_REGION) + 1) 70 71 #endif // _COMPAT_MODE 72 73 74 #else // __x86_64__ 75 76 77 // memory layout 78 #define KERNEL_BASE 0x80000000 79 #define KERNEL_SIZE 0x80000000 80 #define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1)) 81 82 /* User space layout is a little special: 83 * The user space does not completely cover the space not covered by the 84 * kernel. There is a gap of 64kb between the user and kernel space. The 64kb 85 * region assures a user space thread cannot pass a buffer into the kernel as 86 * part of a syscall that would cross into kernel space. 87 * Further, there is a 1MB hole starting at 0x0 to prevent NULL from being mapped. 88 */ 89 #define USER_BASE 0x100000 90 #define USER_BASE_ANY USER_BASE 91 #define USER_SIZE (KERNEL_BASE - (0x10000 + USER_BASE)) 92 #define USER_TOP (USER_BASE + (USER_SIZE - 1)) 93 94 #define KERNEL_USER_DATA_BASE 0x60000000 95 #define USER_STACK_REGION 0x70000000 96 #define USER_STACK_REGION_SIZE ((USER_TOP - USER_STACK_REGION) + 1) 97 98 99 #endif // __x86_64__ 100 101 #endif // _KERNEL_ARCH_x86_KERNEL_H 102