Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
299
arch/ia64/mm/contig.c
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299
arch/ia64/mm/contig.c
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1998-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Stephane Eranian <eranian@hpl.hp.com>
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* Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
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* Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
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*
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* Routines used by ia64 machines with contiguous (or virtually contiguous)
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* memory.
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*/
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#include <linux/config.h>
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#include <linux/bootmem.h>
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#include <linux/efi.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <asm/meminit.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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#include <asm/mca.h>
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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static unsigned long num_dma_physpages;
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#endif
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/**
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* show_mem - display a memory statistics summary
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*
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* Just walks the pages in the system and describes where they're allocated.
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*/
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void
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show_mem (void)
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{
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int i, total = 0, reserved = 0;
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int shared = 0, cached = 0;
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
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i = max_mapnr;
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while (i-- > 0) {
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if (!pfn_valid(i))
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continue;
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total++;
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if (PageReserved(mem_map+i))
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reserved++;
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else if (PageSwapCache(mem_map+i))
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cached++;
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else if (page_count(mem_map + i))
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shared += page_count(mem_map + i) - 1;
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}
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printk("%d pages of RAM\n", total);
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printk("%d reserved pages\n", reserved);
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printk("%d pages shared\n", shared);
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printk("%d pages swap cached\n", cached);
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printk("%ld pages in page table cache\n", pgtable_cache_size);
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}
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/* physical address where the bootmem map is located */
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unsigned long bootmap_start;
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/**
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* find_max_pfn - adjust the maximum page number callback
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* @start: start of range
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* @end: end of range
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* @arg: address of pointer to global max_pfn variable
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*
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* Passed as a callback function to efi_memmap_walk() to determine the highest
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* available page frame number in the system.
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*/
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int
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find_max_pfn (unsigned long start, unsigned long end, void *arg)
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{
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unsigned long *max_pfnp = arg, pfn;
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pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
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if (pfn > *max_pfnp)
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*max_pfnp = pfn;
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return 0;
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}
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/**
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* find_bootmap_location - callback to find a memory area for the bootmap
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* @start: start of region
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* @end: end of region
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* @arg: unused callback data
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*
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* Find a place to put the bootmap and return its starting address in
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* bootmap_start. This address must be page-aligned.
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*/
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int
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find_bootmap_location (unsigned long start, unsigned long end, void *arg)
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{
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unsigned long needed = *(unsigned long *)arg;
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unsigned long range_start, range_end, free_start;
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int i;
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#if IGNORE_PFN0
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if (start == PAGE_OFFSET) {
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start += PAGE_SIZE;
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if (start >= end)
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return 0;
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}
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#endif
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free_start = PAGE_OFFSET;
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for (i = 0; i < num_rsvd_regions; i++) {
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range_start = max(start, free_start);
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range_end = min(end, rsvd_region[i].start & PAGE_MASK);
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free_start = PAGE_ALIGN(rsvd_region[i].end);
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if (range_end <= range_start)
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continue; /* skip over empty range */
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if (range_end - range_start >= needed) {
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bootmap_start = __pa(range_start);
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return -1; /* done */
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}
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/* nothing more available in this segment */
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if (range_end == end)
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return 0;
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}
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return 0;
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}
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/**
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* find_memory - setup memory map
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*
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* Walk the EFI memory map and find usable memory for the system, taking
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* into account reserved areas.
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*/
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void
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find_memory (void)
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{
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unsigned long bootmap_size;
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reserve_memory();
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/* first find highest page frame number */
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max_pfn = 0;
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efi_memmap_walk(find_max_pfn, &max_pfn);
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/* how many bytes to cover all the pages */
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bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
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/* look for a location to hold the bootmap */
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bootmap_start = ~0UL;
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efi_memmap_walk(find_bootmap_location, &bootmap_size);
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if (bootmap_start == ~0UL)
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panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
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bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);
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/* Free all available memory, then mark bootmem-map as being in use. */
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efi_memmap_walk(filter_rsvd_memory, free_bootmem);
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reserve_bootmem(bootmap_start, bootmap_size);
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find_initrd();
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}
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#ifdef CONFIG_SMP
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/**
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* per_cpu_init - setup per-cpu variables
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*
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* Allocate and setup per-cpu data areas.
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*/
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void *
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per_cpu_init (void)
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{
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void *cpu_data;
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int cpu;
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/*
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* get_free_pages() cannot be used before cpu_init() done. BSP
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* allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
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* get_zeroed_page().
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*/
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if (smp_processor_id() == 0) {
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cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
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PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
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for (cpu = 0; cpu < NR_CPUS; cpu++) {
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memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
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__per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
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cpu_data += PERCPU_PAGE_SIZE;
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per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
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}
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}
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return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
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}
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#endif /* CONFIG_SMP */
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static int
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count_pages (u64 start, u64 end, void *arg)
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{
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unsigned long *count = arg;
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*count += (end - start) >> PAGE_SHIFT;
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return 0;
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}
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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static int
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count_dma_pages (u64 start, u64 end, void *arg)
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{
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unsigned long *count = arg;
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if (start < MAX_DMA_ADDRESS)
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*count += (min(end, MAX_DMA_ADDRESS) - start) >> PAGE_SHIFT;
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return 0;
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}
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#endif
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/*
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* Set up the page tables.
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*/
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void
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paging_init (void)
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{
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unsigned long max_dma;
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unsigned long zones_size[MAX_NR_ZONES];
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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unsigned long zholes_size[MAX_NR_ZONES];
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unsigned long max_gap;
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#endif
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/* initialize mem_map[] */
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memset(zones_size, 0, sizeof(zones_size));
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num_physpages = 0;
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efi_memmap_walk(count_pages, &num_physpages);
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max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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memset(zholes_size, 0, sizeof(zholes_size));
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num_dma_physpages = 0;
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efi_memmap_walk(count_dma_pages, &num_dma_physpages);
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if (max_low_pfn < max_dma) {
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zones_size[ZONE_DMA] = max_low_pfn;
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zholes_size[ZONE_DMA] = max_low_pfn - num_dma_physpages;
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} else {
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zones_size[ZONE_DMA] = max_dma;
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zholes_size[ZONE_DMA] = max_dma - num_dma_physpages;
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if (num_physpages > num_dma_physpages) {
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zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
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zholes_size[ZONE_NORMAL] =
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((max_low_pfn - max_dma) -
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(num_physpages - num_dma_physpages));
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}
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}
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max_gap = 0;
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efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
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if (max_gap < LARGE_GAP) {
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vmem_map = (struct page *) 0;
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free_area_init_node(0, &contig_page_data, zones_size, 0,
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zholes_size);
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} else {
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unsigned long map_size;
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/* allocate virtual_mem_map */
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map_size = PAGE_ALIGN(max_low_pfn * sizeof(struct page));
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vmalloc_end -= map_size;
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vmem_map = (struct page *) vmalloc_end;
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efi_memmap_walk(create_mem_map_page_table, NULL);
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NODE_DATA(0)->node_mem_map = vmem_map;
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free_area_init_node(0, &contig_page_data, zones_size,
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0, zholes_size);
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printk("Virtual mem_map starts at 0x%p\n", mem_map);
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}
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#else /* !CONFIG_VIRTUAL_MEM_MAP */
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if (max_low_pfn < max_dma)
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zones_size[ZONE_DMA] = max_low_pfn;
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else {
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zones_size[ZONE_DMA] = max_dma;
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zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
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}
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free_area_init(zones_size);
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#endif /* !CONFIG_VIRTUAL_MEM_MAP */
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zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
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}
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