386 lines
10 KiB
C
386 lines
10 KiB
C
/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* Dave Engebretsen <engebret@us.ibm.com>
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* Rework for PPC64 port.
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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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*/
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#include <linux/config.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/stddef.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/bootmem.h>
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#include <linux/highmem.h>
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#include <linux/idr.h>
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#include <linux/nodemask.h>
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#include <linux/module.h>
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#include <asm/pgalloc.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/lmb.h>
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#include <asm/rtas.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/uaccess.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/tlb.h>
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#include <asm/eeh.h>
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#include <asm/processor.h>
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#include <asm/mmzone.h>
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#include <asm/cputable.h>
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#include <asm/ppcdebug.h>
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#include <asm/sections.h>
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#include <asm/system.h>
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#include <asm/iommu.h>
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#include <asm/abs_addr.h>
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#include <asm/vdso.h>
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#include <asm/imalloc.h>
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#if PGTABLE_RANGE > USER_VSID_RANGE
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#warning Limited user VSID range means pagetable space is wasted
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#endif
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#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
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#warning TASK_SIZE is smaller than it needs to be.
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#endif
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int mem_init_done;
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unsigned long ioremap_bot = IMALLOC_BASE;
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static unsigned long phbs_io_bot = PHBS_IO_BASE;
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extern pgd_t swapper_pg_dir[];
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extern struct task_struct *current_set[NR_CPUS];
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unsigned long klimit = (unsigned long)_end;
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unsigned long _SDR1=0;
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unsigned long _ASR=0;
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/* max amount of RAM to use */
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unsigned long __max_memory;
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/* info on what we think the IO hole is */
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unsigned long io_hole_start;
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unsigned long io_hole_size;
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/*
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* Do very early mm setup.
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*/
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void __init mm_init_ppc64(void)
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{
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#ifndef CONFIG_PPC_ISERIES
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unsigned long i;
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#endif
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ppc64_boot_msg(0x100, "MM Init");
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/* This is the story of the IO hole... please, keep seated,
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* unfortunately, we are out of oxygen masks at the moment.
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* So we need some rough way to tell where your big IO hole
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* is. On pmac, it's between 2G and 4G, on POWER3, it's around
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* that area as well, on POWER4 we don't have one, etc...
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* We need that as a "hint" when sizing the TCE table on POWER3
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* So far, the simplest way that seem work well enough for us it
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* to just assume that the first discontinuity in our physical
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* RAM layout is the IO hole. That may not be correct in the future
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* (and isn't on iSeries but then we don't care ;)
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*/
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#ifndef CONFIG_PPC_ISERIES
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for (i = 1; i < lmb.memory.cnt; i++) {
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unsigned long base, prevbase, prevsize;
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prevbase = lmb.memory.region[i-1].base;
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prevsize = lmb.memory.region[i-1].size;
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base = lmb.memory.region[i].base;
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if (base > (prevbase + prevsize)) {
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io_hole_start = prevbase + prevsize;
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io_hole_size = base - (prevbase + prevsize);
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break;
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}
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}
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#endif /* CONFIG_PPC_ISERIES */
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if (io_hole_start)
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printk("IO Hole assumed to be %lx -> %lx\n",
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io_hole_start, io_hole_start + io_hole_size - 1);
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ppc64_boot_msg(0x100, "MM Init Done");
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}
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)__init_begin;
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for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
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memset((void *)addr, 0xcc, PAGE_SIZE);
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ClearPageReserved(virt_to_page(addr));
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set_page_count(virt_to_page(addr), 1);
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free_page(addr);
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totalram_pages++;
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}
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printk ("Freeing unused kernel memory: %luk freed\n",
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((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (start < end)
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printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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set_page_count(virt_to_page(start), 1);
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free_page(start);
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totalram_pages++;
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}
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}
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#endif
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/*
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* Initialize the bootmem system and give it all the memory we
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* have available.
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*/
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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void __init do_init_bootmem(void)
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{
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unsigned long i;
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unsigned long start, bootmap_pages;
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unsigned long total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
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int boot_mapsize;
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/*
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* Find an area to use for the bootmem bitmap. Calculate the size of
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* bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
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* Add 1 additional page in case the address isn't page-aligned.
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*/
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bootmap_pages = bootmem_bootmap_pages(total_pages);
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start = lmb_alloc(bootmap_pages<<PAGE_SHIFT, PAGE_SIZE);
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BUG_ON(!start);
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boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
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max_pfn = max_low_pfn;
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/* Add all physical memory to the bootmem map, mark each area
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* present.
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*/
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for (i=0; i < lmb.memory.cnt; i++)
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free_bootmem(lmb.memory.region[i].base,
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lmb_size_bytes(&lmb.memory, i));
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/* reserve the sections we're already using */
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for (i=0; i < lmb.reserved.cnt; i++)
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reserve_bootmem(lmb.reserved.region[i].base,
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lmb_size_bytes(&lmb.reserved, i));
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for (i=0; i < lmb.memory.cnt; i++)
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memory_present(0, lmb_start_pfn(&lmb.memory, i),
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lmb_end_pfn(&lmb.memory, i));
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}
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/*
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* paging_init() sets up the page tables - in fact we've already done this.
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*/
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void __init paging_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES];
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unsigned long zholes_size[MAX_NR_ZONES];
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unsigned long total_ram = lmb_phys_mem_size();
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unsigned long top_of_ram = lmb_end_of_DRAM();
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printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
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top_of_ram, total_ram);
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printk(KERN_INFO "Memory hole size: %ldMB\n",
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(top_of_ram - total_ram) >> 20);
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/*
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* All pages are DMA-able so we put them all in the DMA zone.
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*/
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memset(zones_size, 0, sizeof(zones_size));
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memset(zholes_size, 0, sizeof(zholes_size));
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zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
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zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT;
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free_area_init_node(0, NODE_DATA(0), zones_size,
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__pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
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}
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#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
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static struct kcore_list kcore_vmem;
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static int __init setup_kcore(void)
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{
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int i;
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for (i=0; i < lmb.memory.cnt; i++) {
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unsigned long base, size;
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struct kcore_list *kcore_mem;
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base = lmb.memory.region[i].base;
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size = lmb.memory.region[i].size;
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/* GFP_ATOMIC to avoid might_sleep warnings during boot */
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kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
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if (!kcore_mem)
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panic("mem_init: kmalloc failed\n");
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kclist_add(kcore_mem, __va(base), size);
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}
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kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
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return 0;
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}
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module_init(setup_kcore);
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void __init mem_init(void)
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{
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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int nid;
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#endif
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pg_data_t *pgdat;
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unsigned long i;
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struct page *page;
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unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
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num_physpages = max_low_pfn; /* RAM is assumed contiguous */
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high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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for_each_online_node(nid) {
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if (NODE_DATA(nid)->node_spanned_pages != 0) {
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printk("freeing bootmem node %x\n", nid);
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totalram_pages +=
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free_all_bootmem_node(NODE_DATA(nid));
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}
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}
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#else
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max_mapnr = num_physpages;
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totalram_pages += free_all_bootmem();
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#endif
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for_each_pgdat(pgdat) {
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for (i = 0; i < pgdat->node_spanned_pages; i++) {
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page = pgdat_page_nr(pgdat, i);
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if (PageReserved(page))
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reservedpages++;
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}
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}
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codesize = (unsigned long)&_etext - (unsigned long)&_stext;
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initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
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datasize = (unsigned long)&_edata - (unsigned long)&__init_end;
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bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
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printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
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"%luk reserved, %luk data, %luk bss, %luk init)\n",
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(unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
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num_physpages << (PAGE_SHIFT-10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT-10),
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datasize >> 10,
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bsssize >> 10,
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initsize >> 10);
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mem_init_done = 1;
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/* Initialize the vDSO */
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vdso_init();
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}
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void __iomem * reserve_phb_iospace(unsigned long size)
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{
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void __iomem *virt_addr;
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if (phbs_io_bot >= IMALLOC_BASE)
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panic("reserve_phb_iospace(): phb io space overflow\n");
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virt_addr = (void __iomem *) phbs_io_bot;
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phbs_io_bot += size;
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return virt_addr;
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}
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static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
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{
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memset(addr, 0, kmem_cache_size(cache));
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}
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static const int pgtable_cache_size[2] = {
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PTE_TABLE_SIZE, PMD_TABLE_SIZE
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};
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static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
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"pgd_pte_cache", "pud_pmd_cache",
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};
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kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
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void pgtable_cache_init(void)
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{
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int i;
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BUILD_BUG_ON(PTE_TABLE_SIZE != pgtable_cache_size[PTE_CACHE_NUM]);
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BUILD_BUG_ON(PMD_TABLE_SIZE != pgtable_cache_size[PMD_CACHE_NUM]);
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BUILD_BUG_ON(PUD_TABLE_SIZE != pgtable_cache_size[PUD_CACHE_NUM]);
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BUILD_BUG_ON(PGD_TABLE_SIZE != pgtable_cache_size[PGD_CACHE_NUM]);
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for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
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int size = pgtable_cache_size[i];
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const char *name = pgtable_cache_name[i];
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pgtable_cache[i] = kmem_cache_create(name,
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size, size,
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SLAB_HWCACHE_ALIGN
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| SLAB_MUST_HWCACHE_ALIGN,
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zero_ctor,
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NULL);
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if (! pgtable_cache[i])
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panic("pgtable_cache_init(): could not create %s!\n",
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name);
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}
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}
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pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
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unsigned long size, pgprot_t vma_prot)
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{
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if (ppc_md.phys_mem_access_prot)
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return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot);
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if (!page_is_ram(addr >> PAGE_SHIFT))
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vma_prot = __pgprot(pgprot_val(vma_prot)
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| _PAGE_GUARDED | _PAGE_NO_CACHE);
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return vma_prot;
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}
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EXPORT_SYMBOL(phys_mem_access_prot);
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