mapped_kernel.h

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/*
 * File created by Kanoj Sarcar 06/06/00.
 * Copyright 2000 Silicon Graphics, Inc.
 */
#ifndef __ASM_SN_MAPPED_KERNEL_H
#define __ASM_SN_MAPPED_KERNEL_H

/*
 * Note on how mapped kernels work: the text and data section is 
 * compiled at cksseg segment (LOADADDR = 0xc001c000), and the 
 * init/setup/data section gets a 16M virtual address bump in the 
 * ld.script file (so that tlblo0 and tlblo1 maps the sections). 
 * The vmlinux.64 section addresses are put in the xkseg range 
 * using the change-addresses makefile option. Use elfdump -of 
 * on IRIX to see where the sections go. The Origin loader loads 
 * the two sections contiguously in physical memory. The loader 
 * sets the entry point into kernel_entry using a xkphys address, 
 * but instead of using 0xa800000001160000, it uses the address 
 * 0xa800000000160000, which is where it physically loaded that 
 * code. So no jumps can be done before we have switched to using 
 * cksseg addresses.
 */
#include <linux/config.h>
#include <asm/addrspace.h>

#ifdef CONFIG_MAPPED_KERNEL

#define MAPPED_ADDR_RO_TO_PHYS(x)	(x - CKSSEG)
#define MAPPED_ADDR_RW_TO_PHYS(x)	(x - CKSSEG - 16777216)

#define MAPPED_KERN_RO_PHYSBASE(n) \
			(PLAT_NODE_DATA(n)->kern_vars.kv_ro_baseaddr)
#define MAPPED_KERN_RW_PHYSBASE(n) \
			(PLAT_NODE_DATA(n)->kern_vars.kv_rw_baseaddr)

#define MAPPED_KERN_RO_TO_PHYS(x) \
				((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
				MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid()))
#define MAPPED_KERN_RW_TO_PHYS(x) \
				((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
				MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid()))
#define MAPPED_OFFSET			16777216

#else /* CONFIG_MAPPED_KERNEL */

#define MAPPED_KERN_RO_TO_PHYS(x)	(x - CKSEG0)
#define MAPPED_KERN_RW_TO_PHYS(x)	(x - CKSEG0)
#define MAPPED_OFFSET			0

#endif /* CONFIG_MAPPED_KERNEL */

#define MAPPED_KERN_RO_TO_K0(x)	PHYS_TO_K0(MAPPED_KERN_RO_TO_PHYS(x))
#define MAPPED_KERN_RW_TO_K0(x)	PHYS_TO_K0(MAPPED_KERN_RW_TO_PHYS(x))

#endif /* __ASM_SN_MAPPED_KERNEL_H  */