memory.h
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上传日期:2013-02-24
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- /*
- * linux/include/asm-arm/arch-rpc/memory.h
- *
- * Copyright (C) 1996,1997,1998 Russell King.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Changelog:
- * 20-Oct-1996 RMK Created
- * 31-Dec-1997 RMK Fixed definitions to reduce warnings
- * 11-Jan-1998 RMK Uninlined to reduce hits on cache
- * 08-Feb-1998 RMK Added __virt_to_bus and __bus_to_virt
- * 21-Mar-1999 RMK Renamed to memory.h
- * RMK Added TASK_SIZE and PAGE_OFFSET
- */
- #ifndef __ASM_ARCH_MMU_H
- #define __ASM_ARCH_MMU_H
- /*
- * Task size: 3GB
- */
- #define TASK_SIZE (0xc0000000UL)
- #define TASK_SIZE_26 (0x04000000UL)
- /*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's.
- */
- #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
- /*
- * Page offset: 3GB
- */
- #define PAGE_OFFSET (0xc0000000UL)
- #define PHYS_OFFSET (0x10000000UL)
- #define __virt_to_phys__is_a_macro
- #define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET)
- #define __phys_to_virt__is_a_macro
- #define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET)
- /*
- * These are exactly the same on the RiscPC as the
- * physical memory view.
- */
- #define __virt_to_bus__is_a_macro
- #define __virt_to_bus(x) __virt_to_phys(x)
- #define __bus_to_virt__is_a_macro
- #define __bus_to_virt(x) __phys_to_virt(x)
- #define PHYS_TO_NID(addr) (0)
- #endif