mirror of https://gitee.com/openkylin/linux.git
160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/* MN10300 Memory management initialisation
|
|
*
|
|
* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Modified by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#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/ptrace.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/init.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/bootmem.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/sections.h>
|
|
|
|
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
|
|
|
|
unsigned long highstart_pfn, highend_pfn;
|
|
|
|
/*
|
|
* set up paging
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
unsigned long zones_size[MAX_NR_ZONES] = {0,};
|
|
pte_t *ppte;
|
|
int loop;
|
|
|
|
/* main kernel space -> RAM mapping is handled as 1:1 transparent by
|
|
* the MMU */
|
|
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
|
|
memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));
|
|
|
|
/* load the VMALLOC area PTE table addresses into the kernel PGD */
|
|
ppte = kernel_vmalloc_ptes;
|
|
for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
|
|
loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
|
|
loop++
|
|
) {
|
|
set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
|
|
ppte += PAGE_SIZE / sizeof(pte_t);
|
|
}
|
|
|
|
/* declare the sizes of the RAM zones (only use the normal zone) */
|
|
zones_size[ZONE_NORMAL] =
|
|
contig_page_data.bdata->node_low_pfn -
|
|
contig_page_data.bdata->node_min_pfn;
|
|
|
|
/* pass the memory from the bootmem allocator to the main allocator */
|
|
free_area_init(zones_size);
|
|
|
|
__flush_tlb_all();
|
|
}
|
|
|
|
/*
|
|
* transfer all the memory from the bootmem allocator to the runtime allocator
|
|
*/
|
|
void __init mem_init(void)
|
|
{
|
|
int codesize, reservedpages, datasize, initsize;
|
|
int tmp;
|
|
|
|
if (!mem_map)
|
|
BUG();
|
|
|
|
#define START_PFN (contig_page_data.bdata->node_min_pfn)
|
|
#define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn)
|
|
|
|
max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN;
|
|
high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE);
|
|
|
|
/* clear the zero-page */
|
|
memset(empty_zero_page, 0, PAGE_SIZE);
|
|
|
|
/* this will put all low memory onto the freelists */
|
|
totalram_pages += free_all_bootmem();
|
|
|
|
reservedpages = 0;
|
|
for (tmp = 0; tmp < num_physpages; tmp++)
|
|
if (PageReserved(&mem_map[tmp]))
|
|
reservedpages++;
|
|
|
|
codesize = (unsigned long) &_etext - (unsigned long) &_stext;
|
|
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
|
|
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
|
|
|
|
printk(KERN_INFO
|
|
"Memory: %luk/%luk available"
|
|
" (%dk kernel code, %dk reserved, %dk data, %dk init,"
|
|
" %ldk highmem)\n",
|
|
nr_free_pages() << (PAGE_SHIFT - 10),
|
|
max_mapnr << (PAGE_SHIFT - 10),
|
|
codesize >> 10,
|
|
reservedpages << (PAGE_SHIFT - 10),
|
|
datasize >> 10,
|
|
initsize >> 10,
|
|
totalhigh_pages << (PAGE_SHIFT - 10));
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
void free_init_pages(char *what, unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
|
|
for (addr = begin; addr < end; addr += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(addr));
|
|
init_page_count(virt_to_page(addr));
|
|
memset((void *) addr, 0xcc, PAGE_SIZE);
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
|
|
}
|
|
|
|
/*
|
|
* recycle memory containing stuff only required for initialisation
|
|
*/
|
|
void free_initmem(void)
|
|
{
|
|
free_init_pages("unused kernel memory",
|
|
(unsigned long) &__init_begin,
|
|
(unsigned long) &__init_end);
|
|
}
|
|
|
|
/*
|
|
* dispose of the memory on which the initial ramdisk resided
|
|
*/
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
free_init_pages("initrd memory", start, end);
|
|
}
|
|
#endif
|