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phoenix |
/*
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* File created by Kanoj Sarcar 06/06/00.
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* Copyright 2000 Silicon Graphics, Inc.
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*/
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#ifndef __ASM_SN_MAPPED_KERNEL_H
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#define __ASM_SN_MAPPED_KERNEL_H
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/*
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* Note on how mapped kernels work: the text and data section is
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* compiled at cksseg segment (LOADADDR = 0xc001c000), and the
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* init/setup/data section gets a 16M virtual address bump in the
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* ld.script file (so that tlblo0 and tlblo1 maps the sections).
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* The vmlinux.64 section addresses are put in the xkseg range
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* using the change-addresses makefile option. Use elfdump -of
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* on IRIX to see where the sections go. The Origin loader loads
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* the two sections contiguously in physical memory. The loader
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* sets the entry point into kernel_entry using a xkphys address,
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* but instead of using 0xa800000001160000, it uses the address
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* 0xa800000000160000, which is where it physically loaded that
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* code. So no jumps can be done before we have switched to using
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* cksseg addresses.
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*/
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#include <linux/config.h>
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#include <asm/addrspace.h>
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#ifdef CONFIG_MAPPED_KERNEL
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#define MAPPED_ADDR_RO_TO_PHYS(x) (x - CKSSEG)
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#define MAPPED_ADDR_RW_TO_PHYS(x) (x - CKSSEG - 16777216)
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#define MAPPED_KERN_RO_PHYSBASE(n) \
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(PLAT_NODE_DATA(n)->kern_vars.kv_ro_baseaddr)
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#define MAPPED_KERN_RW_PHYSBASE(n) \
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(PLAT_NODE_DATA(n)->kern_vars.kv_rw_baseaddr)
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#define MAPPED_KERN_RO_TO_PHYS(x) \
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((unsigned long)MAPPED_ADDR_RO_TO_PHYS(x) | \
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MAPPED_KERN_RO_PHYSBASE(get_compact_nodeid()))
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#define MAPPED_KERN_RW_TO_PHYS(x) \
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((unsigned long)MAPPED_ADDR_RW_TO_PHYS(x) | \
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MAPPED_KERN_RW_PHYSBASE(get_compact_nodeid()))
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#define MAPPED_OFFSET 16777216
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#else /* CONFIG_MAPPED_KERNEL */
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#define MAPPED_KERN_RO_TO_PHYS(x) (x - CKSEG0)
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#define MAPPED_KERN_RW_TO_PHYS(x) (x - CKSEG0)
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#define MAPPED_OFFSET 0
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#endif /* CONFIG_MAPPED_KERNEL */
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#define MAPPED_KERN_RO_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RO_TO_PHYS(x))
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#define MAPPED_KERN_RW_TO_K0(x) PHYS_TO_K0(MAPPED_KERN_RW_TO_PHYS(x))
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#endif /* __ASM_SN_MAPPED_KERNEL_H */
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