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/*
* 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_KERN_RO_TO_PHYS(x) (x - CKSSEG)
#define MAPPED_KERN_RW_TO_PHYS(x) (x - CKSSEG - 16777216)
#else /* CONFIG_MAPPED_KERNEL */
#define MAPPED_KERN_RO_TO_PHYS(x) (x - CKSEG0)
#define MAPPED_KERN_RW_TO_PHYS(x) (x - CKSEG0)
#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
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