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44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/*
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* Copyright 2012, Alex Smith, alex@alex-smith.me.uk.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _KERNEL_ARCH_X86_64_KERNEL_H
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#define _KERNEL_ARCH_X86_64_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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// 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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#ifdef _BOOT_MODE
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# define KERNEL_BASE 0x80000000
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# define KERNEL_BASE_64BIT 0xffffffff80000000ll
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#else
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# define KERNEL_BASE 0xffffff8000000000
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#endif
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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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#endif /* _KERNEL_ARCH_X86_64_KERNEL_H */
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