87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*
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* Copyright 2004-2008, Haiku Inc. All rights reserved.
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* Distributed under the terms of the MIT license.
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*
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* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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* Distributed under the terms of the NewOS License.
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*/
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#ifndef _KERNEL_ARCH_x86_KERNEL_H
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#define _KERNEL_ARCH_x86_KERNEL_H
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#ifndef _ASSEMBLER
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# include <arch/cpu.h>
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#endif
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#ifdef _BOOT_MODE
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// 32-bit and 64-bit kernel load addresses.
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#define KERNEL_LOAD_BASE 0x80000000
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#define KERNEL_LOAD_BASE_64_BIT 0xffffffff80000000ll
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#elif defined(__x86_64__)
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// Base of the kernel address space.
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// KERNEL_BASE is the base of the kernel address space. This differs from the
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// address where the kernel is loaded to: the kernel is loaded in the top 2GB
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// of the virtual address space as required by GCC's kernel code model. The
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// whole kernel address space is the top 512GB of the address space.
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#define KERNEL_BASE 0xffffff0000000000
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#define KERNEL_SIZE 0x10000000000
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#define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1))
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#define KERNEL_LOAD_BASE 0xffffffff80000000
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// Kernel physical memory map area.
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#define KERNEL_PMAP_BASE 0xffffff0000000000
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#define KERNEL_PMAP_SIZE 0x8000000000
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// Userspace address space layout.
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// There is a 2MB hole just before the end of the bottom half of the address
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// space. This means that if userland passes in a buffer that crosses into the
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// uncanonical address region, it will be caught through a page fault.
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#define USER_BASE 0x0
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#define USER_BASE_ANY 0x100000
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#define USER_SIZE (0x800000000000 - 0x200000)
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#define USER_TOP (USER_BASE + (USER_SIZE - 1))
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#define KERNEL_USER_DATA_BASE 0x7f0000000000
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#define USER_STACK_REGION 0x7f0000000000
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#define USER_STACK_REGION_SIZE ((USER_TOP - USER_STACK_REGION) + 1)
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#else // __x86_64__
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// memory layout
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#define KERNEL_BASE 0x80000000
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#define KERNEL_SIZE 0x80000000
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#define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1))
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/* User space layout is a little special:
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* The user space does not completely cover the space not covered by the
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* kernel. There is a gap of 64kb between the user and kernel space. The 64kb
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* region assures a user space thread cannot pass a buffer into the kernel as
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* part of a syscall that would cross into kernel space.
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* Furthermore no areas are placed in the lower 1Mb unless the application
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* explicitly requests it to find null pointer references.
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* TODO: introduce the 1Mb lower barrier again - it's only used for vm86 mode,
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* and this should be moved into the kernel (and address space) completely.
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*/
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#define USER_BASE 0x0
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#define USER_BASE_ANY 0x100000
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#define USER_SIZE (KERNEL_BASE - 0x10000)
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#define USER_TOP (USER_BASE + (USER_SIZE - 1))
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#define KERNEL_USER_DATA_BASE 0x60000000
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#define USER_STACK_REGION 0x70000000
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#define USER_STACK_REGION_SIZE ((USER_TOP - USER_STACK_REGION) + 1)
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#endif // __x86_64__
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#endif // _KERNEL_ARCH_x86_KERNEL_H
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