0897e314b7
Not many changes seeing as there's not much x86_64 stuff done yet. Small differences are handled with ifdefs, large differences (descriptors.h, struct iframe) have separate headers under arch/x86/32 and arch/x86/64.
81 lines
2.5 KiB
C
81 lines
2.5 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_BASE 0x80000000
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#define KERNEL_BASE_64BIT 0xffffffff80000000ll
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#elif defined(__x86_64__)
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// Base of the kernel address space.
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// When compiling the bootloader, KERNEL_BASE is set to the x86 base address,
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// KERNEL_BASE_64BIT is set to where the kernel loaded to.
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// For the kernel, KERNEL_BASE is the base of the kernel address space. This is
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// NOT the address where the kernel is loaded to: the kernel is loaded in the
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// top 2GB of the virtual address space as required by GCC's kernel code model.
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// The whole kernel address space is the top 512GB of the address space.
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#define KERNEL_BASE 0xffffff8000000000
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#define KERNEL_SIZE 0x8000000000
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#define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1))
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// Userspace address space layout.
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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
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#define USER_TOP (USER_BASE + USER_SIZE)
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#define KERNEL_USER_DATA_BASE 0x7fffefff0000
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#define USER_STACK_REGION 0x7ffff0000000
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#define USER_STACK_REGION_SIZE (USER_TOP - USER_STACK_REGION)
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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 0x00
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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)
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#define KERNEL_USER_DATA_BASE 0x6fff0000
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#define USER_STACK_REGION 0x70000000
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#define USER_STACK_REGION_SIZE (USER_TOP - USER_STACK_REGION)
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#endif // __x86_64__
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#endif // _KERNEL_ARCH_x86_KERNEL_H
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