253 строки
7.1 KiB
C
253 строки
7.1 KiB
C
/*
|
|
* PowerPC version
|
|
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
|
*
|
|
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
|
|
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
|
|
* Copyright (C) 1996 Paul Mackerras
|
|
*
|
|
* Derived from "arch/i386/mm/init.c"
|
|
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
|
|
*
|
|
* Dave Engebretsen <engebret@us.ibm.com>
|
|
* Rework for PPC64 port.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/module.h>
|
|
#include <linux/poison.h>
|
|
#include <linux/lmb.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/eeh.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmzone.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/system.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/abs_addr.h>
|
|
#include <asm/vdso.h>
|
|
|
|
#include "mmu_decl.h"
|
|
|
|
#ifdef CONFIG_PPC_STD_MMU_64
|
|
#if PGTABLE_RANGE > USER_VSID_RANGE
|
|
#warning Limited user VSID range means pagetable space is wasted
|
|
#endif
|
|
|
|
#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
|
|
#warning TASK_SIZE is smaller than it needs to be.
|
|
#endif
|
|
#endif /* CONFIG_PPC_STD_MMU_64 */
|
|
|
|
phys_addr_t memstart_addr = ~0;
|
|
phys_addr_t kernstart_addr;
|
|
|
|
void free_initmem(void)
|
|
{
|
|
unsigned long addr;
|
|
|
|
addr = (unsigned long)__init_begin;
|
|
for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
|
|
memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
|
|
ClearPageReserved(virt_to_page(addr));
|
|
init_page_count(virt_to_page(addr));
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
printk ("Freeing unused kernel memory: %luk freed\n",
|
|
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (start < end)
|
|
printk ("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);
|
|
totalram_pages++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void pgd_ctor(void *addr)
|
|
{
|
|
memset(addr, 0, PGD_TABLE_SIZE);
|
|
}
|
|
|
|
static void pmd_ctor(void *addr)
|
|
{
|
|
memset(addr, 0, PMD_TABLE_SIZE);
|
|
}
|
|
|
|
static const unsigned int pgtable_cache_size[2] = {
|
|
PGD_TABLE_SIZE, PMD_TABLE_SIZE
|
|
};
|
|
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
"pgd_cache", "pmd_cache",
|
|
#else
|
|
"pgd_cache", "pud_pmd_cache",
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
};
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
/* Hugepages need an extra cache per hugepagesize, initialized in
|
|
* hugetlbpage.c. We can't put into the tables above, because HPAGE_SHIFT
|
|
* is not compile time constant. */
|
|
struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+MMU_PAGE_COUNT];
|
|
#else
|
|
struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
|
|
#endif
|
|
|
|
void pgtable_cache_init(void)
|
|
{
|
|
pgtable_cache[0] = kmem_cache_create(pgtable_cache_name[0], PGD_TABLE_SIZE, PGD_TABLE_SIZE, SLAB_PANIC, pgd_ctor);
|
|
pgtable_cache[1] = kmem_cache_create(pgtable_cache_name[1], PMD_TABLE_SIZE, PMD_TABLE_SIZE, SLAB_PANIC, pmd_ctor);
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
/*
|
|
* Given an address within the vmemmap, determine the pfn of the page that
|
|
* represents the start of the section it is within. Note that we have to
|
|
* do this by hand as the proffered address may not be correctly aligned.
|
|
* Subtraction of non-aligned pointers produces undefined results.
|
|
*/
|
|
static unsigned long __meminit vmemmap_section_start(unsigned long page)
|
|
{
|
|
unsigned long offset = page - ((unsigned long)(vmemmap));
|
|
|
|
/* Return the pfn of the start of the section. */
|
|
return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
|
|
}
|
|
|
|
/*
|
|
* Check if this vmemmap page is already initialised. If any section
|
|
* which overlaps this vmemmap page is initialised then this page is
|
|
* initialised already.
|
|
*/
|
|
static int __meminit vmemmap_populated(unsigned long start, int page_size)
|
|
{
|
|
unsigned long end = start + page_size;
|
|
|
|
for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
|
|
if (pfn_valid(vmemmap_section_start(start)))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* On hash-based CPUs, the vmemmap is bolted in the hash table.
|
|
*
|
|
* On Book3E CPUs, the vmemmap is currently mapped in the top half of
|
|
* the vmalloc space using normal page tables, though the size of
|
|
* pages encoded in the PTEs can be different
|
|
*/
|
|
|
|
#ifdef CONFIG_PPC_BOOK3E
|
|
static void __meminit vmemmap_create_mapping(unsigned long start,
|
|
unsigned long page_size,
|
|
unsigned long phys)
|
|
{
|
|
/* Create a PTE encoding without page size */
|
|
unsigned long i, flags = _PAGE_PRESENT | _PAGE_ACCESSED |
|
|
_PAGE_KERNEL_RW;
|
|
|
|
/* PTEs only contain page size encodings up to 32M */
|
|
BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].enc > 0xf);
|
|
|
|
/* Encode the size in the PTE */
|
|
flags |= mmu_psize_defs[mmu_vmemmap_psize].enc << 8;
|
|
|
|
/* For each PTE for that area, map things. Note that we don't
|
|
* increment phys because all PTEs are of the large size and
|
|
* thus must have the low bits clear
|
|
*/
|
|
for (i = 0; i < page_size; i += PAGE_SIZE)
|
|
BUG_ON(map_kernel_page(start + i, phys, flags));
|
|
}
|
|
#else /* CONFIG_PPC_BOOK3E */
|
|
static void __meminit vmemmap_create_mapping(unsigned long start,
|
|
unsigned long page_size,
|
|
unsigned long phys)
|
|
{
|
|
int mapped = htab_bolt_mapping(start, start + page_size, phys,
|
|
PAGE_KERNEL, mmu_vmemmap_psize,
|
|
mmu_kernel_ssize);
|
|
BUG_ON(mapped < 0);
|
|
}
|
|
#endif /* CONFIG_PPC_BOOK3E */
|
|
|
|
int __meminit vmemmap_populate(struct page *start_page,
|
|
unsigned long nr_pages, int node)
|
|
{
|
|
unsigned long start = (unsigned long)start_page;
|
|
unsigned long end = (unsigned long)(start_page + nr_pages);
|
|
unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
|
|
|
|
/* Align to the page size of the linear mapping. */
|
|
start = _ALIGN_DOWN(start, page_size);
|
|
|
|
pr_debug("vmemmap_populate page %p, %ld pages, node %d\n",
|
|
start_page, nr_pages, node);
|
|
pr_debug(" -> map %lx..%lx\n", start, end);
|
|
|
|
for (; start < end; start += page_size) {
|
|
void *p;
|
|
|
|
if (vmemmap_populated(start, page_size))
|
|
continue;
|
|
|
|
p = vmemmap_alloc_block(page_size, node);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
pr_debug(" * %016lx..%016lx allocated at %p\n",
|
|
start, start + page_size, p);
|
|
|
|
vmemmap_create_mapping(start, page_size, __pa(p));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|