6f6d78e877
* platform_allocate_elf_region() is removed, it is implemented in platform- independent code now (ELF*Class::AllocateRegion). For ELF64 it is now assumed that 64-bit addresses are mapped in the loader's 32-bit address space as (address - KERNEL_BASE_64BIT + KERNEL_BASE). * mapped_delta field from preloaded_*_image removed, now handled compile-time using the ELF*Class::Map method. * Also link the kernel with -z max-page-size=0x1000, removes the need for 2MB alignment on the data segment (not going to map the kernel with large pages for the time being).
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/*
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* Copyright 2004-2008, Haiku Inc. All rights reserved.
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* Distributes 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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// 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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#ifdef _BOOT_MODE
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# define KERNEL_BASE_64BIT 0xffffffff80000000
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#endif
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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 /* _KERNEL_ARCH_x86_KERNEL_H */
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