mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 15:00:17 +07:00
c39f52a9ed
Same code, except: The alignment of init_thread_union is handled via the linker script, so no point to have it with the data structure. The extra asm(".data") looks like a leftover from an asm to C conversion and is pointless. Use the generic version. Move the page table data to parisc/mm/init.c and get rid of parisc/../init_task.c Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Link: http://lkml.kernel.org/r/20120503085035.150896946@linutronix.de
1122 lines
29 KiB
C
1122 lines
29 KiB
C
/*
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* linux/arch/parisc/mm/init.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright 1999 SuSE GmbH
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* changed by Philipp Rumpf
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* Copyright 1999 Philipp Rumpf (prumpf@tux.org)
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* Copyright 2004 Randolph Chung (tausq@debian.org)
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* Copyright 2006-2007 Helge Deller (deller@gmx.de)
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*
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/gfp.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */
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#include <linux/initrd.h>
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#include <linux/swap.h>
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#include <linux/unistd.h>
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#include <linux/nodemask.h> /* for node_online_map */
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#include <linux/pagemap.h> /* for release_pages and page_cache_release */
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlb.h>
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#include <asm/pdc_chassis.h>
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#include <asm/mmzone.h>
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#include <asm/sections.h>
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extern int data_start;
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#if PT_NLEVELS == 3
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/* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
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* with the first pmd adjacent to the pgd and below it. gcc doesn't actually
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* guarantee that global objects will be laid out in memory in the same order
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* as the order of declaration, so put these in different sections and use
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* the linker script to order them. */
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pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
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#endif
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
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pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
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#ifdef CONFIG_DISCONTIGMEM
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struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
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unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
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#endif
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static struct resource data_resource = {
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.name = "Kernel data",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource code_resource = {
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.name = "Kernel code",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource pdcdata_resource = {
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.name = "PDC data (Page Zero)",
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.start = 0,
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.end = 0x9ff,
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
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/* The following array is initialized from the firmware specific
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* information retrieved in kernel/inventory.c.
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*/
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physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
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int npmem_ranges __read_mostly;
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#ifdef CONFIG_64BIT
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#define MAX_MEM (~0UL)
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#else /* !CONFIG_64BIT */
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#define MAX_MEM (3584U*1024U*1024U)
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#endif /* !CONFIG_64BIT */
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static unsigned long mem_limit __read_mostly = MAX_MEM;
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static void __init mem_limit_func(void)
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{
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char *cp, *end;
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unsigned long limit;
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/* We need this before __setup() functions are called */
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limit = MAX_MEM;
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for (cp = boot_command_line; *cp; ) {
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if (memcmp(cp, "mem=", 4) == 0) {
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cp += 4;
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limit = memparse(cp, &end);
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if (end != cp)
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break;
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cp = end;
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} else {
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while (*cp != ' ' && *cp)
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++cp;
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while (*cp == ' ')
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++cp;
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}
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}
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if (limit < mem_limit)
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mem_limit = limit;
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}
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#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
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static void __init setup_bootmem(void)
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{
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unsigned long bootmap_size;
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unsigned long mem_max;
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unsigned long bootmap_pages;
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unsigned long bootmap_start_pfn;
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unsigned long bootmap_pfn;
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#ifndef CONFIG_DISCONTIGMEM
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physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
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int npmem_holes;
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#endif
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int i, sysram_resource_count;
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disable_sr_hashing(); /* Turn off space register hashing */
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/*
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* Sort the ranges. Since the number of ranges is typically
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* small, and performance is not an issue here, just do
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* a simple insertion sort.
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*/
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for (i = 1; i < npmem_ranges; i++) {
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int j;
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for (j = i; j > 0; j--) {
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unsigned long tmp;
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if (pmem_ranges[j-1].start_pfn <
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pmem_ranges[j].start_pfn) {
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break;
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}
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tmp = pmem_ranges[j-1].start_pfn;
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pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
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pmem_ranges[j].start_pfn = tmp;
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tmp = pmem_ranges[j-1].pages;
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pmem_ranges[j-1].pages = pmem_ranges[j].pages;
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pmem_ranges[j].pages = tmp;
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}
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}
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#ifndef CONFIG_DISCONTIGMEM
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/*
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* Throw out ranges that are too far apart (controlled by
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* MAX_GAP).
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*/
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for (i = 1; i < npmem_ranges; i++) {
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if (pmem_ranges[i].start_pfn -
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(pmem_ranges[i-1].start_pfn +
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pmem_ranges[i-1].pages) > MAX_GAP) {
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npmem_ranges = i;
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printk("Large gap in memory detected (%ld pages). "
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"Consider turning on CONFIG_DISCONTIGMEM\n",
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pmem_ranges[i].start_pfn -
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(pmem_ranges[i-1].start_pfn +
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pmem_ranges[i-1].pages));
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break;
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}
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}
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#endif
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if (npmem_ranges > 1) {
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/* Print the memory ranges */
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printk(KERN_INFO "Memory Ranges:\n");
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for (i = 0; i < npmem_ranges; i++) {
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unsigned long start;
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unsigned long size;
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size = (pmem_ranges[i].pages << PAGE_SHIFT);
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start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
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printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
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i,start, start + (size - 1), size >> 20);
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}
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}
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sysram_resource_count = npmem_ranges;
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for (i = 0; i < sysram_resource_count; i++) {
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struct resource *res = &sysram_resources[i];
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res->name = "System RAM";
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res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
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res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
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res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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request_resource(&iomem_resource, res);
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}
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/*
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* For 32 bit kernels we limit the amount of memory we can
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* support, in order to preserve enough kernel address space
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* for other purposes. For 64 bit kernels we don't normally
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* limit the memory, but this mechanism can be used to
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* artificially limit the amount of memory (and it is written
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* to work with multiple memory ranges).
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*/
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mem_limit_func(); /* check for "mem=" argument */
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mem_max = 0;
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num_physpages = 0;
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for (i = 0; i < npmem_ranges; i++) {
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unsigned long rsize;
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rsize = pmem_ranges[i].pages << PAGE_SHIFT;
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if ((mem_max + rsize) > mem_limit) {
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printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
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if (mem_max == mem_limit)
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npmem_ranges = i;
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else {
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pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
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- (mem_max >> PAGE_SHIFT);
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npmem_ranges = i + 1;
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mem_max = mem_limit;
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}
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num_physpages += pmem_ranges[i].pages;
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break;
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}
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num_physpages += pmem_ranges[i].pages;
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mem_max += rsize;
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}
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printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
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#ifndef CONFIG_DISCONTIGMEM
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/* Merge the ranges, keeping track of the holes */
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{
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unsigned long end_pfn;
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unsigned long hole_pages;
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npmem_holes = 0;
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end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
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for (i = 1; i < npmem_ranges; i++) {
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hole_pages = pmem_ranges[i].start_pfn - end_pfn;
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if (hole_pages) {
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pmem_holes[npmem_holes].start_pfn = end_pfn;
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pmem_holes[npmem_holes++].pages = hole_pages;
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end_pfn += hole_pages;
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}
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end_pfn += pmem_ranges[i].pages;
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}
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pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
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npmem_ranges = 1;
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}
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#endif
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bootmap_pages = 0;
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for (i = 0; i < npmem_ranges; i++)
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bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
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bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
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#ifdef CONFIG_DISCONTIGMEM
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for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
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memset(NODE_DATA(i), 0, sizeof(pg_data_t));
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NODE_DATA(i)->bdata = &bootmem_node_data[i];
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}
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memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
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for (i = 0; i < npmem_ranges; i++) {
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node_set_state(i, N_NORMAL_MEMORY);
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node_set_online(i);
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}
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#endif
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/*
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* Initialize and free the full range of memory in each range.
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* Note that the only writing these routines do are to the bootmap,
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* and we've made sure to locate the bootmap properly so that they
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* won't be writing over anything important.
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*/
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bootmap_pfn = bootmap_start_pfn;
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max_pfn = 0;
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for (i = 0; i < npmem_ranges; i++) {
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unsigned long start_pfn;
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unsigned long npages;
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start_pfn = pmem_ranges[i].start_pfn;
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npages = pmem_ranges[i].pages;
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bootmap_size = init_bootmem_node(NODE_DATA(i),
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bootmap_pfn,
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start_pfn,
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(start_pfn + npages) );
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free_bootmem_node(NODE_DATA(i),
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(start_pfn << PAGE_SHIFT),
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(npages << PAGE_SHIFT) );
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bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
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if ((start_pfn + npages) > max_pfn)
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max_pfn = start_pfn + npages;
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}
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/* IOMMU is always used to access "high mem" on those boxes
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* that can support enough mem that a PCI device couldn't
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* directly DMA to any physical addresses.
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* ISA DMA support will need to revisit this.
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*/
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max_low_pfn = max_pfn;
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/* bootmap sizing messed up? */
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BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
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/* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
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#define PDC_CONSOLE_IO_IODC_SIZE 32768
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reserve_bootmem_node(NODE_DATA(0), 0UL,
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(unsigned long)(PAGE0->mem_free +
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PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
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reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
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(unsigned long)(_end - _text), BOOTMEM_DEFAULT);
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reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
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((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
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BOOTMEM_DEFAULT);
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#ifndef CONFIG_DISCONTIGMEM
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/* reserve the holes */
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for (i = 0; i < npmem_holes; i++) {
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reserve_bootmem_node(NODE_DATA(0),
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(pmem_holes[i].start_pfn << PAGE_SHIFT),
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(pmem_holes[i].pages << PAGE_SHIFT),
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BOOTMEM_DEFAULT);
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}
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
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if (__pa(initrd_start) < mem_max) {
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unsigned long initrd_reserve;
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if (__pa(initrd_end) > mem_max) {
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initrd_reserve = mem_max - __pa(initrd_start);
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} else {
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initrd_reserve = initrd_end - initrd_start;
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}
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initrd_below_start_ok = 1;
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printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
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reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
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initrd_reserve, BOOTMEM_DEFAULT);
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}
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}
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#endif
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data_resource.start = virt_to_phys(&data_start);
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data_resource.end = virt_to_phys(_end) - 1;
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code_resource.start = virt_to_phys(_text);
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code_resource.end = virt_to_phys(&data_start)-1;
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/* We don't know which region the kernel will be in, so try
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* all of them.
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*/
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for (i = 0; i < sysram_resource_count; i++) {
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struct resource *res = &sysram_resources[i];
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request_resource(res, &code_resource);
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request_resource(res, &data_resource);
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}
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request_resource(&sysram_resources[0], &pdcdata_resource);
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}
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static void __init map_pages(unsigned long start_vaddr,
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unsigned long start_paddr, unsigned long size,
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pgprot_t pgprot, int force)
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{
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pgd_t *pg_dir;
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pmd_t *pmd;
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pte_t *pg_table;
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unsigned long end_paddr;
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unsigned long start_pmd;
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unsigned long start_pte;
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unsigned long tmp1;
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unsigned long tmp2;
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unsigned long address;
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unsigned long vaddr;
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unsigned long ro_start;
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unsigned long ro_end;
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unsigned long fv_addr;
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unsigned long gw_addr;
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extern const unsigned long fault_vector_20;
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extern void * const linux_gateway_page;
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ro_start = __pa((unsigned long)_text);
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ro_end = __pa((unsigned long)&data_start);
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fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
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gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
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end_paddr = start_paddr + size;
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pg_dir = pgd_offset_k(start_vaddr);
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#if PTRS_PER_PMD == 1
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start_pmd = 0;
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#else
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start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
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#endif
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start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
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address = start_paddr;
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vaddr = start_vaddr;
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while (address < end_paddr) {
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#if PTRS_PER_PMD == 1
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pmd = (pmd_t *)__pa(pg_dir);
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#else
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pmd = (pmd_t *)pgd_address(*pg_dir);
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/*
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* pmd is physical at this point
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*/
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if (!pmd) {
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pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER);
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pmd = (pmd_t *) __pa(pmd);
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}
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pgd_populate(NULL, pg_dir, __va(pmd));
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#endif
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pg_dir++;
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/* now change pmd to kernel virtual addresses */
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pmd = (pmd_t *)__va(pmd) + start_pmd;
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for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
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/*
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* pg_table is physical at this point
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*/
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pg_table = (pte_t *)pmd_address(*pmd);
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if (!pg_table) {
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pg_table = (pte_t *)
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alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE);
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pg_table = (pte_t *) __pa(pg_table);
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}
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pmd_populate_kernel(NULL, pmd, __va(pg_table));
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/* now change pg_table to kernel virtual addresses */
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pg_table = (pte_t *) __va(pg_table) + start_pte;
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for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
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pte_t pte;
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/*
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* Map the fault vector writable so we can
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* write the HPMC checksum.
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*/
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if (force)
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pte = __mk_pte(address, pgprot);
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else if (core_kernel_text(vaddr) &&
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address != fv_addr)
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pte = __mk_pte(address, PAGE_KERNEL_EXEC);
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else
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#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
|
|
if (address >= ro_start && address < ro_end
|
|
&& address != fv_addr
|
|
&& address != gw_addr)
|
|
pte = __mk_pte(address, PAGE_KERNEL_RO);
|
|
else
|
|
#endif
|
|
pte = __mk_pte(address, pgprot);
|
|
|
|
if (address >= end_paddr) {
|
|
if (force)
|
|
break;
|
|
else
|
|
pte_val(pte) = 0;
|
|
}
|
|
|
|
set_pte(pg_table, pte);
|
|
|
|
address += PAGE_SIZE;
|
|
vaddr += PAGE_SIZE;
|
|
}
|
|
start_pte = 0;
|
|
|
|
if (address >= end_paddr)
|
|
break;
|
|
}
|
|
start_pmd = 0;
|
|
}
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
unsigned long addr;
|
|
unsigned long init_begin = (unsigned long)__init_begin;
|
|
unsigned long init_end = (unsigned long)__init_end;
|
|
|
|
/* The init text pages are marked R-X. We have to
|
|
* flush the icache and mark them RW-
|
|
*
|
|
* This is tricky, because map_pages is in the init section.
|
|
* Do a dummy remap of the data section first (the data
|
|
* section is already PAGE_KERNEL) to pull in the TLB entries
|
|
* for map_kernel */
|
|
map_pages(init_begin, __pa(init_begin), init_end - init_begin,
|
|
PAGE_KERNEL_RWX, 1);
|
|
/* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
|
|
* map_pages */
|
|
map_pages(init_begin, __pa(init_begin), init_end - init_begin,
|
|
PAGE_KERNEL, 1);
|
|
|
|
/* force the kernel to see the new TLB entries */
|
|
__flush_tlb_range(0, init_begin, init_end);
|
|
/* Attempt to catch anyone trying to execute code here
|
|
* by filling the page with BRK insns.
|
|
*/
|
|
memset((void *)init_begin, 0x00, init_end - init_begin);
|
|
/* finally dump all the instructions which were cached, since the
|
|
* pages are no-longer executable */
|
|
flush_icache_range(init_begin, init_end);
|
|
|
|
for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(addr));
|
|
init_page_count(virt_to_page(addr));
|
|
free_page(addr);
|
|
num_physpages++;
|
|
totalram_pages++;
|
|
}
|
|
|
|
/* set up a new led state on systems shipped LED State panel */
|
|
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
|
|
|
|
printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
|
|
(init_end - init_begin) >> 10);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_DEBUG_RODATA
|
|
void mark_rodata_ro(void)
|
|
{
|
|
/* rodata memory was already mapped with KERNEL_RO access rights by
|
|
pagetable_init() and map_pages(). No need to do additional stuff here */
|
|
printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
|
|
(unsigned long)(__end_rodata - __start_rodata) >> 10);
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Just an arbitrary offset to serve as a "hole" between mapping areas
|
|
* (between top of physical memory and a potential pcxl dma mapping
|
|
* area, and below the vmalloc mapping area).
|
|
*
|
|
* The current 32K value just means that there will be a 32K "hole"
|
|
* between mapping areas. That means that any out-of-bounds memory
|
|
* accesses will hopefully be caught. The vmalloc() routines leaves
|
|
* a hole of 4kB between each vmalloced area for the same reason.
|
|
*/
|
|
|
|
/* Leave room for gateway page expansion */
|
|
#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
|
|
#error KERNEL_MAP_START is in gateway reserved region
|
|
#endif
|
|
#define MAP_START (KERNEL_MAP_START)
|
|
|
|
#define VM_MAP_OFFSET (32*1024)
|
|
#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
|
|
& ~(VM_MAP_OFFSET-1)))
|
|
|
|
void *parisc_vmalloc_start __read_mostly;
|
|
EXPORT_SYMBOL(parisc_vmalloc_start);
|
|
|
|
#ifdef CONFIG_PA11
|
|
unsigned long pcxl_dma_start __read_mostly;
|
|
#endif
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
int codesize, reservedpages, datasize, initsize;
|
|
|
|
/* Do sanity checks on page table constants */
|
|
BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
|
|
BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
|
|
BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
|
|
BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
|
|
> BITS_PER_LONG);
|
|
|
|
high_memory = __va((max_pfn << PAGE_SHIFT));
|
|
|
|
#ifndef CONFIG_DISCONTIGMEM
|
|
max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
|
|
totalram_pages += free_all_bootmem();
|
|
#else
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < npmem_ranges; i++)
|
|
totalram_pages += free_all_bootmem_node(NODE_DATA(i));
|
|
}
|
|
#endif
|
|
|
|
codesize = (unsigned long)_etext - (unsigned long)_text;
|
|
datasize = (unsigned long)_edata - (unsigned long)_etext;
|
|
initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
|
|
|
|
reservedpages = 0;
|
|
{
|
|
unsigned long pfn;
|
|
#ifdef CONFIG_DISCONTIGMEM
|
|
int i;
|
|
|
|
for (i = 0; i < npmem_ranges; i++) {
|
|
for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
|
|
if (PageReserved(pfn_to_page(pfn)))
|
|
reservedpages++;
|
|
}
|
|
}
|
|
#else /* !CONFIG_DISCONTIGMEM */
|
|
for (pfn = 0; pfn < max_pfn; pfn++) {
|
|
/*
|
|
* Only count reserved RAM pages
|
|
*/
|
|
if (PageReserved(pfn_to_page(pfn)))
|
|
reservedpages++;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PA11
|
|
if (hppa_dma_ops == &pcxl_dma_ops) {
|
|
pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
|
|
parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
|
|
+ PCXL_DMA_MAP_SIZE);
|
|
} else {
|
|
pcxl_dma_start = 0;
|
|
parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
|
|
}
|
|
#else
|
|
parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
|
|
#endif
|
|
|
|
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
|
|
nr_free_pages() << (PAGE_SHIFT-10),
|
|
num_physpages << (PAGE_SHIFT-10),
|
|
codesize >> 10,
|
|
reservedpages << (PAGE_SHIFT-10),
|
|
datasize >> 10,
|
|
initsize >> 10
|
|
);
|
|
|
|
#ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
|
|
printk("virtual kernel memory layout:\n"
|
|
" vmalloc : 0x%p - 0x%p (%4ld MB)\n"
|
|
" memory : 0x%p - 0x%p (%4ld MB)\n"
|
|
" .init : 0x%p - 0x%p (%4ld kB)\n"
|
|
" .data : 0x%p - 0x%p (%4ld kB)\n"
|
|
" .text : 0x%p - 0x%p (%4ld kB)\n",
|
|
|
|
(void*)VMALLOC_START, (void*)VMALLOC_END,
|
|
(VMALLOC_END - VMALLOC_START) >> 20,
|
|
|
|
__va(0), high_memory,
|
|
((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
|
|
|
|
__init_begin, __init_end,
|
|
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
|
|
|
|
_etext, _edata,
|
|
((unsigned long)_edata - (unsigned long)_etext) >> 10,
|
|
|
|
_text, _etext,
|
|
((unsigned long)_etext - (unsigned long)_text) >> 10);
|
|
#endif
|
|
}
|
|
|
|
unsigned long *empty_zero_page __read_mostly;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
void show_mem(unsigned int filter)
|
|
{
|
|
int i,free = 0,total = 0,reserved = 0;
|
|
int shared = 0, cached = 0;
|
|
|
|
printk(KERN_INFO "Mem-info:\n");
|
|
show_free_areas(filter);
|
|
#ifndef CONFIG_DISCONTIGMEM
|
|
i = max_mapnr;
|
|
while (i-- > 0) {
|
|
total++;
|
|
if (PageReserved(mem_map+i))
|
|
reserved++;
|
|
else if (PageSwapCache(mem_map+i))
|
|
cached++;
|
|
else if (!page_count(&mem_map[i]))
|
|
free++;
|
|
else
|
|
shared += page_count(&mem_map[i]) - 1;
|
|
}
|
|
#else
|
|
for (i = 0; i < npmem_ranges; i++) {
|
|
int j;
|
|
|
|
for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
|
|
struct page *p;
|
|
unsigned long flags;
|
|
|
|
pgdat_resize_lock(NODE_DATA(i), &flags);
|
|
p = nid_page_nr(i, j) - node_start_pfn(i);
|
|
|
|
total++;
|
|
if (PageReserved(p))
|
|
reserved++;
|
|
else if (PageSwapCache(p))
|
|
cached++;
|
|
else if (!page_count(p))
|
|
free++;
|
|
else
|
|
shared += page_count(p) - 1;
|
|
pgdat_resize_unlock(NODE_DATA(i), &flags);
|
|
}
|
|
}
|
|
#endif
|
|
printk(KERN_INFO "%d pages of RAM\n", total);
|
|
printk(KERN_INFO "%d reserved pages\n", reserved);
|
|
printk(KERN_INFO "%d pages shared\n", shared);
|
|
printk(KERN_INFO "%d pages swap cached\n", cached);
|
|
|
|
|
|
#ifdef CONFIG_DISCONTIGMEM
|
|
{
|
|
struct zonelist *zl;
|
|
int i, j;
|
|
|
|
for (i = 0; i < npmem_ranges; i++) {
|
|
zl = node_zonelist(i, 0);
|
|
for (j = 0; j < MAX_NR_ZONES; j++) {
|
|
struct zoneref *z;
|
|
struct zone *zone;
|
|
|
|
printk("Zone list for zone %d on node %d: ", j, i);
|
|
for_each_zone_zonelist(zone, z, zl, j)
|
|
printk("[%d/%s] ", zone_to_nid(zone),
|
|
zone->name);
|
|
printk("\n");
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* pagetable_init() sets up the page tables
|
|
*
|
|
* Note that gateway_init() places the Linux gateway page at page 0.
|
|
* Since gateway pages cannot be dereferenced this has the desirable
|
|
* side effect of trapping those pesky NULL-reference errors in the
|
|
* kernel.
|
|
*/
|
|
static void __init pagetable_init(void)
|
|
{
|
|
int range;
|
|
|
|
/* Map each physical memory range to its kernel vaddr */
|
|
|
|
for (range = 0; range < npmem_ranges; range++) {
|
|
unsigned long start_paddr;
|
|
unsigned long end_paddr;
|
|
unsigned long size;
|
|
|
|
start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
|
|
end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
|
|
size = pmem_ranges[range].pages << PAGE_SHIFT;
|
|
|
|
map_pages((unsigned long)__va(start_paddr), start_paddr,
|
|
size, PAGE_KERNEL, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (initrd_end && initrd_end > mem_limit) {
|
|
printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
|
|
map_pages(initrd_start, __pa(initrd_start),
|
|
initrd_end - initrd_start, PAGE_KERNEL, 0);
|
|
}
|
|
#endif
|
|
|
|
empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
|
|
memset(empty_zero_page, 0, PAGE_SIZE);
|
|
}
|
|
|
|
static void __init gateway_init(void)
|
|
{
|
|
unsigned long linux_gateway_page_addr;
|
|
/* FIXME: This is 'const' in order to trick the compiler
|
|
into not treating it as DP-relative data. */
|
|
extern void * const linux_gateway_page;
|
|
|
|
linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
|
|
|
|
/*
|
|
* Setup Linux Gateway page.
|
|
*
|
|
* The Linux gateway page will reside in kernel space (on virtual
|
|
* page 0), so it doesn't need to be aliased into user space.
|
|
*/
|
|
|
|
map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
|
|
PAGE_SIZE, PAGE_GATEWAY, 1);
|
|
}
|
|
|
|
#ifdef CONFIG_HPUX
|
|
void
|
|
map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
|
|
{
|
|
pgd_t *pg_dir;
|
|
pmd_t *pmd;
|
|
pte_t *pg_table;
|
|
unsigned long start_pmd;
|
|
unsigned long start_pte;
|
|
unsigned long address;
|
|
unsigned long hpux_gw_page_addr;
|
|
/* FIXME: This is 'const' in order to trick the compiler
|
|
into not treating it as DP-relative data. */
|
|
extern void * const hpux_gateway_page;
|
|
|
|
hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
|
|
|
|
/*
|
|
* Setup HP-UX Gateway page.
|
|
*
|
|
* The HP-UX gateway page resides in the user address space,
|
|
* so it needs to be aliased into each process.
|
|
*/
|
|
|
|
pg_dir = pgd_offset(mm,hpux_gw_page_addr);
|
|
|
|
#if PTRS_PER_PMD == 1
|
|
start_pmd = 0;
|
|
#else
|
|
start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
|
|
#endif
|
|
start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
|
|
|
|
address = __pa(&hpux_gateway_page);
|
|
#if PTRS_PER_PMD == 1
|
|
pmd = (pmd_t *)__pa(pg_dir);
|
|
#else
|
|
pmd = (pmd_t *) pgd_address(*pg_dir);
|
|
|
|
/*
|
|
* pmd is physical at this point
|
|
*/
|
|
|
|
if (!pmd) {
|
|
pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
|
|
pmd = (pmd_t *) __pa(pmd);
|
|
}
|
|
|
|
__pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
|
|
#endif
|
|
/* now change pmd to kernel virtual addresses */
|
|
|
|
pmd = (pmd_t *)__va(pmd) + start_pmd;
|
|
|
|
/*
|
|
* pg_table is physical at this point
|
|
*/
|
|
|
|
pg_table = (pte_t *) pmd_address(*pmd);
|
|
if (!pg_table)
|
|
pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
|
|
|
|
__pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
|
|
|
|
/* now change pg_table to kernel virtual addresses */
|
|
|
|
pg_table = (pte_t *) __va(pg_table) + start_pte;
|
|
set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
|
|
}
|
|
EXPORT_SYMBOL(map_hpux_gateway_page);
|
|
#endif
|
|
|
|
void __init paging_init(void)
|
|
{
|
|
int i;
|
|
|
|
setup_bootmem();
|
|
pagetable_init();
|
|
gateway_init();
|
|
flush_cache_all_local(); /* start with known state */
|
|
flush_tlb_all_local(NULL);
|
|
|
|
for (i = 0; i < npmem_ranges; i++) {
|
|
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
|
|
|
|
zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
|
|
|
|
#ifdef CONFIG_DISCONTIGMEM
|
|
/* Need to initialize the pfnnid_map before we can initialize
|
|
the zone */
|
|
{
|
|
int j;
|
|
for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
|
|
j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
|
|
j++) {
|
|
pfnnid_map[j] = i;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
free_area_init_node(i, zones_size,
|
|
pmem_ranges[i].start_pfn, NULL);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PA20
|
|
|
|
/*
|
|
* Currently, all PA20 chips have 18 bit protection IDs, which is the
|
|
* limiting factor (space ids are 32 bits).
|
|
*/
|
|
|
|
#define NR_SPACE_IDS 262144
|
|
|
|
#else
|
|
|
|
/*
|
|
* Currently we have a one-to-one relationship between space IDs and
|
|
* protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
|
|
* support 15 bit protection IDs, so that is the limiting factor.
|
|
* PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
|
|
* probably not worth the effort for a special case here.
|
|
*/
|
|
|
|
#define NR_SPACE_IDS 32768
|
|
|
|
#endif /* !CONFIG_PA20 */
|
|
|
|
#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
|
|
#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
|
|
|
|
static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
|
|
static unsigned long dirty_space_id[SID_ARRAY_SIZE];
|
|
static unsigned long space_id_index;
|
|
static unsigned long free_space_ids = NR_SPACE_IDS - 1;
|
|
static unsigned long dirty_space_ids = 0;
|
|
|
|
static DEFINE_SPINLOCK(sid_lock);
|
|
|
|
unsigned long alloc_sid(void)
|
|
{
|
|
unsigned long index;
|
|
|
|
spin_lock(&sid_lock);
|
|
|
|
if (free_space_ids == 0) {
|
|
if (dirty_space_ids != 0) {
|
|
spin_unlock(&sid_lock);
|
|
flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
|
|
spin_lock(&sid_lock);
|
|
}
|
|
BUG_ON(free_space_ids == 0);
|
|
}
|
|
|
|
free_space_ids--;
|
|
|
|
index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
|
|
space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
|
|
space_id_index = index;
|
|
|
|
spin_unlock(&sid_lock);
|
|
|
|
return index << SPACEID_SHIFT;
|
|
}
|
|
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void free_sid(unsigned long spaceid)
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{
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unsigned long index = spaceid >> SPACEID_SHIFT;
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unsigned long *dirty_space_offset;
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dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
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index &= (BITS_PER_LONG - 1);
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spin_lock(&sid_lock);
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BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
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*dirty_space_offset |= (1L << index);
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dirty_space_ids++;
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spin_unlock(&sid_lock);
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}
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#ifdef CONFIG_SMP
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static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
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{
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int i;
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/* NOTE: sid_lock must be held upon entry */
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*ndirtyptr = dirty_space_ids;
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if (dirty_space_ids != 0) {
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for (i = 0; i < SID_ARRAY_SIZE; i++) {
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dirty_array[i] = dirty_space_id[i];
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dirty_space_id[i] = 0;
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}
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dirty_space_ids = 0;
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}
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return;
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}
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static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
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{
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int i;
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|
|
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/* NOTE: sid_lock must be held upon entry */
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|
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if (ndirty != 0) {
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for (i = 0; i < SID_ARRAY_SIZE; i++) {
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space_id[i] ^= dirty_array[i];
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}
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free_space_ids += ndirty;
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space_id_index = 0;
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}
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}
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#else /* CONFIG_SMP */
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static void recycle_sids(void)
|
|
{
|
|
int i;
|
|
|
|
/* NOTE: sid_lock must be held upon entry */
|
|
|
|
if (dirty_space_ids != 0) {
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|
for (i = 0; i < SID_ARRAY_SIZE; i++) {
|
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space_id[i] ^= dirty_space_id[i];
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|
dirty_space_id[i] = 0;
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}
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|
|
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free_space_ids += dirty_space_ids;
|
|
dirty_space_ids = 0;
|
|
space_id_index = 0;
|
|
}
|
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}
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#endif
|
|
|
|
/*
|
|
* flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
|
|
* purged, we can safely reuse the space ids that were released but
|
|
* not flushed from the tlb.
|
|
*/
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static unsigned long recycle_ndirty;
|
|
static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
|
|
static unsigned int recycle_inuse;
|
|
|
|
void flush_tlb_all(void)
|
|
{
|
|
int do_recycle;
|
|
|
|
do_recycle = 0;
|
|
spin_lock(&sid_lock);
|
|
if (dirty_space_ids > RECYCLE_THRESHOLD) {
|
|
BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
|
|
get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
|
|
recycle_inuse++;
|
|
do_recycle++;
|
|
}
|
|
spin_unlock(&sid_lock);
|
|
on_each_cpu(flush_tlb_all_local, NULL, 1);
|
|
if (do_recycle) {
|
|
spin_lock(&sid_lock);
|
|
recycle_sids(recycle_ndirty,recycle_dirty_array);
|
|
recycle_inuse = 0;
|
|
spin_unlock(&sid_lock);
|
|
}
|
|
}
|
|
#else
|
|
void flush_tlb_all(void)
|
|
{
|
|
spin_lock(&sid_lock);
|
|
flush_tlb_all_local(NULL);
|
|
recycle_sids();
|
|
spin_unlock(&sid_lock);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (start >= end)
|
|
return;
|
|
printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
|
|
for (; start < end; start += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(start));
|
|
init_page_count(virt_to_page(start));
|
|
free_page(start);
|
|
num_physpages++;
|
|
totalram_pages++;
|
|
}
|
|
}
|
|
#endif
|