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