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/*
* Copyright (c) 2010-2014 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* This file is a top header in the inclusion hierarchy, and shouldn't include
* other headers that may cause circular dependencies.
*/
#ifndef _X86_PARAM_H
#define _X86_PARAM_H
#include <kern/macros.h>
#define __LITTLE_ENDIAN__
/*
* L1 cache line size.
*
* XXX Use this value until processor selection is available.
*/
#define CPU_L1_SIZE 64
/*
* Code/data alignment.
*/
#define TEXT_ALIGN 16
#ifdef __LP64__
#define DATA_ALIGN 8
#else /* __LP64__ */
#define DATA_ALIGN 4
#endif /* __LP64__ */
/*
* Attributes for variables that are mostly read and seldom changed.
*/
#define __read_mostly __section(".data.read_mostly")
/*
* Provide architecture-specific string functions.
*/
#define ARCH_STRING_MEMCPY
#define ARCH_STRING_MEMMOVE
#define ARCH_STRING_MEMSET
#define ARCH_STRING_MEMCMP
#define ARCH_STRING_STRLEN
#define ARCH_STRING_STRCPY
#define ARCH_STRING_STRCMP
/*
* System timer frequency.
*
* The selected value of 200 translates to a period of 5ms, small enough to
* provide low latency, and is practical as both a dividend and divisor.
*/
#define HZ 200
/*
* 4 KiB pages.
*/
#define PAGE_SHIFT 12
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_MASK (PAGE_SIZE - 1)
/*
* Kernel stack size for threads and interrupt handlers.
*/
#define STACK_SIZE PAGE_SIZE
/*
* Virtual memory properties.
*/
/*
* User space boundaries.
*/
#define VM_MIN_ADDRESS DECL_CONST(0, UL)
#ifdef __LP64__
#define VM_MAX_ADDRESS DECL_CONST(0x800000000000, UL)
#else /* __LP64__ */
#define VM_MAX_ADDRESS DECL_CONST(0xc0000000, UL)
#endif/* __LP64__ */
/*
* Kernel space boundaries.
*/
#ifdef __LP64__
#define VM_MIN_KERNEL_ADDRESS DECL_CONST(0xffff800000000000, UL)
#define VM_MAX_KERNEL_ADDRESS DECL_CONST(0xfffffffffffff000, UL)
#else /* __LP64__ */
#define VM_MIN_KERNEL_ADDRESS VM_MAX_ADDRESS
#define VM_MAX_KERNEL_ADDRESS DECL_CONST(0xfffff000, UL)
#endif /* __LP64__ */
/*
* Direct physical mapping boundaries.
*/
#ifdef __LP64__
#define VM_MIN_DIRECTMAP_ADDRESS VM_MIN_KERNEL_ADDRESS
#define VM_MAX_DIRECTMAP_ADDRESS DECL_CONST(0xffffc00000000000, UL)
#else /* __LP64__ */
#define VM_MIN_DIRECTMAP_ADDRESS VM_MAX_ADDRESS
#define VM_MAX_DIRECTMAP_ADDRESS DECL_CONST(0xf8000000, UL)
#endif /* __LP64__ */
/*
* Kernel mapping offset.
*
* On 32-bits systems, the kernel is linked at addresses included in the
* direct physical mapping, whereas on 64-bits systems, it is linked at
* -2 GiB because the "kernel" memory model is used when compiling (see
* the -mcmodel=kernel gcc option).
*/
#ifdef __LP64__
#define VM_KERNEL_OFFSET DECL_CONST(0xffffffff80000000, UL)
#else /* __LP64__ */
#define VM_KERNEL_OFFSET VM_MIN_DIRECTMAP_ADDRESS
#endif /* __LP64__ */
/*
* Kernel virtual space boundaries.
*
* In addition to the direct physical mapping, the kernel has its own virtual
* memory space.
*/
#define VM_MIN_KMEM_ADDRESS VM_MAX_DIRECTMAP_ADDRESS
#ifdef __LP64__
#define VM_MAX_KMEM_ADDRESS VM_KERNEL_OFFSET
#else /* __LP64__ */
#define VM_MAX_KMEM_ADDRESS DECL_CONST(0xfffff000, UL)
#endif /* __LP64__ */
/*
* Physical memory properties.
*/
#define VM_PAGE_DMA_LIMIT DECL_CONST(0x1000000, UL)
#ifdef __LP64__
#define VM_PAGE_MAX_SEGS 4
#define VM_PAGE_DMA32_LIMIT DECL_CONST(0x100000000, UL)
#define VM_PAGE_DIRECTMAP_LIMIT DECL_CONST(0x400000000000, UL)
#define VM_PAGE_HIGHMEM_LIMIT DECL_CONST(0x10000000000000, UL)
#else /* __LP64__ */
#define VM_PAGE_DIRECTMAP_LIMIT DECL_CONST(0x38000000, ULL)
#ifdef X86_PAE
#define VM_PAGE_MAX_SEGS 3
#define VM_PAGE_HIGHMEM_LIMIT DECL_CONST(0x10000000000000, ULL)
#else /* X86_PAE */
#define VM_PAGE_MAX_SEGS 3
#define VM_PAGE_HIGHMEM_LIMIT DECL_CONST(0xfffff000, UL)
#endif /* X86_PAE */
#endif /* __LP64__ */
/*
* Physical segment indexes.
*/
#define VM_PAGE_SEG_DMA 0
#ifdef __LP64__
#define VM_PAGE_SEG_DMA32 1
#define VM_PAGE_SEG_DIRECTMAP 2
#define VM_PAGE_SEG_HIGHMEM 3
#else /* __LP64__ */
#define VM_PAGE_SEG_DMA32 1 /* Alias for the DIRECTMAP segment */
#define VM_PAGE_SEG_DIRECTMAP 1
#define VM_PAGE_SEG_HIGHMEM 2
#endif /* __LP64__ */
#endif /* _X86_PARAM_H */
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