forked from luck/tmp_suning_uos_patched
802f192e4a
A new option for SPARSEMEM is ARCH_SPARSEMEM_EXTREME. Architecture platforms with a very sparse physical address space would likely want to select this option. For those architecture platforms that don't select the option, the code generated is equivalent to SPARSEMEM currently in -mm. I'll be posting a patch on ia64 ml which uses this new SPARSEMEM feature. ARCH_SPARSEMEM_EXTREME makes mem_section a one dimensional array of pointers to mem_sections. This two level layout scheme is able to achieve smaller memory requirements for SPARSEMEM with the tradeoff of an additional shift and load when fetching the memory section. The current SPARSEMEM -mm implementation is a one dimensional array of mem_sections which is the default SPARSEMEM configuration. The patch attempts isolates the implementation details of the physical layout of the sparsemem section array. ARCH_SPARSEMEM_EXTREME depends on 64BIT and is by default boolean false. I've boot tested under aim load ia64 configured for ARCH_SPARSEMEM_EXTREME. I've also boot tested a 4 way Opteron machine with !ARCH_SPARSEMEM_EXTREME and tested with aim. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Bob Picco <bob.picco@hp.com> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#ifndef _PPC64_LMB_H
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#define _PPC64_LMB_H
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/*
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* Definitions for talking to the Open Firmware PROM on
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* Power Macintosh computers.
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*
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* Copyright (C) 2001 Peter Bergner, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <asm/prom.h>
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#define MAX_LMB_REGIONS 128
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#define LMB_ALLOC_ANYWHERE 0
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struct lmb_property {
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unsigned long base;
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unsigned long size;
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};
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struct lmb_region {
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unsigned long cnt;
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unsigned long size;
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struct lmb_property region[MAX_LMB_REGIONS+1];
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};
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struct lmb {
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unsigned long debug;
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unsigned long rmo_size;
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struct lmb_region memory;
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struct lmb_region reserved;
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};
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extern struct lmb lmb;
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extern void __init lmb_init(void);
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extern void __init lmb_analyze(void);
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extern long __init lmb_add(unsigned long, unsigned long);
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extern long __init lmb_reserve(unsigned long, unsigned long);
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extern unsigned long __init lmb_alloc(unsigned long, unsigned long);
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extern unsigned long __init lmb_alloc_base(unsigned long, unsigned long,
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unsigned long);
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extern unsigned long __init lmb_phys_mem_size(void);
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extern unsigned long __init lmb_end_of_DRAM(void);
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extern unsigned long __init lmb_abs_to_phys(unsigned long);
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extern void __init lmb_enforce_memory_limit(void);
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extern void lmb_dump_all(void);
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extern unsigned long io_hole_start;
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static inline unsigned long
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lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
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{
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return type->region[region_nr].size;
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}
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static inline unsigned long
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lmb_size_pages(struct lmb_region *type, unsigned long region_nr)
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{
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return lmb_size_bytes(type, region_nr) >> PAGE_SHIFT;
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}
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static inline unsigned long
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lmb_start_pfn(struct lmb_region *type, unsigned long region_nr)
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{
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return type->region[region_nr].base >> PAGE_SHIFT;
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}
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static inline unsigned long
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lmb_end_pfn(struct lmb_region *type, unsigned long region_nr)
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{
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return lmb_start_pfn(type, region_nr) +
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lmb_size_pages(type, region_nr);
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}
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#endif /* _PPC64_LMB_H */
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