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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 - 2000 by Ralf Baechle
* Copyright (C) 2000 Silicon Graphics, Inc.
*
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
*/
#include <linux/config.h>
#include <linux/init.h>
#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/pagemap.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/swapctl.h>
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/blk.h>
#endif
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/jazzdma.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#ifdef CONFIG_SGI_IP22
#include <asm/sgialib.h>
#endif
#include <asm/mmu_context.h>
#include <asm/tlb.h>
mmu_gather_t mmu_gathers[NR_CPUS];
static unsigned long totalram_pages;
extern void prom_free_prom_memory(void);
asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
{
/* This should flush more selectivly ... */
__flush_cache_all();
return 0;
}
/*
* We have upto 8 empty zeroed pages so we can map one of the right colour
* when needed. This is necessary only on R4000 / R4400 SC and MC versions
* where we have to avoid VCED / VECI exceptions for good performance at
* any price. Since page is never written to after the initialization we
* don't have to care about aliases on other CPUs.
*/
unsigned long empty_zero_page, zero_page_mask;
static inline unsigned long setup_zero_pages(void)
{
unsigned long order, size;
struct page *page;
if(mips_cpu.options & MIPS_CPU_VCE)
order = 3;
else
order = 0;
empty_zero_page = __get_free_pages(GFP_KERNEL, order);
if (!empty_zero_page)
panic("Oh boy, that early out of memory?");
page = virt_to_page(empty_zero_page);
while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
set_bit(PG_reserved, &page->flags);
set_page_count(page, 0);
page++;
}
size = PAGE_SIZE << order;
zero_page_mask = (size - 1) & PAGE_MASK;
memset((void *)empty_zero_page, 0, size);
return 1UL << order;
}
int do_check_pgt_cache(int low, int high)
{
int freed = 0;
if(pgtable_cache_size > high) {
do {
if(pgd_quicklist)
free_pgd_slow(get_pgd_fast()), freed++;
if(pmd_quicklist)
free_pmd_slow(get_pmd_fast()), freed++;
if(pte_quicklist)
free_pte_slow(get_pte_fast()), freed++;
} while(pgtable_cache_size > low);
}
return freed;
}
void show_mem(void)
{
int i, free = 0, total = 0, reserved = 0;
int shared = 0, cached = 0;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6dkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
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;
}
printk("%d pages of RAM\n", total);
printk("%d reserved pages\n", reserved);
printk("%d pages shared\n", shared);
printk("%d pages swap cached\n",cached);
printk("%ld pages in page table cache\n",pgtable_cache_size);
printk("%d free pages\n", free);
show_buffers();
}
/* References to section boundaries */
extern char _ftext, _etext, _fdata, _edata;
extern char __init_begin, __init_end;
void __init paging_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
unsigned long max_dma, low;
/* Initialize the entire pgd. */
pgd_init((unsigned long)swapper_pg_dir);
pgd_init((unsigned long)swapper_pg_dir + PAGE_SIZE / 2);
max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
low = max_low_pfn;
#if defined(CONFIG_PCI) || defined(CONFIG_ISA)
if (low < max_dma)
zones_size[ZONE_DMA] = low;
else {
zones_size[ZONE_DMA] = max_dma;
zones_size[ZONE_NORMAL] = low - max_dma;
}
#else
zones_size[ZONE_DMA] = low;
#endif
free_area_init(zones_size);
}
#define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
static inline int page_is_ram(unsigned long pagenr)
{
int i;
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long addr, end;
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
/* not usable memory */
continue;
addr = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
if (pagenr >= addr && pagenr < end)
return 1;
}
return 0;
}
void __init mem_init(void)
{
unsigned long codesize, reservedpages, datasize, initsize;
unsigned long tmp, ram;
max_mapnr = num_physpages = max_low_pfn;
high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
totalram_pages += free_all_bootmem();
totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
reservedpages = ram = 0;
for (tmp = 0; tmp < max_low_pfn; tmp++)
if (page_is_ram(tmp)) {
ram++;
if (PageReserved(mem_map+tmp))
reservedpages++;
}
codesize = (unsigned long) &_etext - (unsigned long) &_ftext;
datasize = (unsigned long) &_edata - (unsigned long) &_fdata;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
"%ldk data, %ldk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
ram << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 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));
set_page_count(virt_to_page(start), 1);
free_page(start);
totalram_pages++;
}
}
#endif
extern char __init_begin, __init_end;
extern void prom_free_prom_memory(void);
void free_initmem(void)
{
unsigned long addr;
prom_free_prom_memory ();
addr = (unsigned long) &__init_begin;
while (addr < (unsigned long) &__init_end) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
free_page(addr);
totalram_pages++;
addr += PAGE_SIZE;
}
printk("Freeing unused kernel memory: %dk freed\n",
(&__init_end - &__init_begin) >> 10);
}
void si_meminfo(struct sysinfo *val)
{
val->totalram = totalram_pages;
val->sharedram = atomic_read(&shmem_nrpages);
val->freeram = nr_free_pages();
val->bufferram = atomic_read(&buffermem_pages);
val->totalhigh = 0;
val->freehigh = nr_free_highpages();
val->mem_unit = PAGE_SIZE;
return;
}
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