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/*
* linux/arch/m68k/mm/init.c
*
* Copyright (C) 1995 Hamish Macdonald
*
* Contains common initialization routines, specific init code moved
* to motorola.c and sun3mmu.c
*/
#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#ifdef CONFIG_BLK_DEV_RAM
#include <linux/blk.h>
#endif
#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <asm/io.h>
#ifdef CONFIG_ATARI
#include <asm/atari_stram.h>
#endif
static unsigned long totalram_pages = 0;
#ifdef CONFIG_SUN3
void mmu_emu_reserve_pages(unsigned long max_page);
#endif
int do_check_pgt_cache(int low, int high)
{
int freed = 0;
if(pgtable_cache_size > high) {
do {
if(pmd_quicklist)
freed += free_pmd_slow(get_pmd_fast());
if(pte_quicklist)
free_pte_slow(get_pte_fast()), freed++;
} while(pgtable_cache_size > low);
}
return freed;
}
/*
* BAD_PAGE is the page that is used for page faults when linux
* is out-of-memory. Older versions of linux just did a
* do_exit(), but using this instead means there is less risk
* for a process dying in kernel mode, possibly leaving an inode
* unused etc..
*
* BAD_PAGETABLE is the accompanying page-table: it is initialized
* to point to BAD_PAGE entries.
*
* ZERO_PAGE is a special page that is used for zero-initialized
* data and COW.
*/
unsigned long empty_bad_page_table;
pte_t *__bad_pagetable(void)
{
memset((void *)empty_bad_page_table, 0, PAGE_SIZE);
return (pte_t *)empty_bad_page_table;
}
unsigned long empty_bad_page;
pte_t __bad_page(void)
{
memset ((void *)empty_bad_page, 0, PAGE_SIZE);
return pte_mkdirty(__mk_pte(empty_bad_page, PAGE_SHARED));
}
unsigned long empty_zero_page;
void show_mem(void)
{
unsigned long i;
int free = 0, total = 0, reserved = 0, nonshared = 0, shared = 0;
int cached = 0;
printk("\nMem-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 if (page_count(mem_map+i) == 1)
nonshared++;
else
shared += page_count(mem_map+i) - 1;
}
printk("%d pages of RAM\n",total);
printk("%d free pages\n",free);
printk("%d reserved pages\n",reserved);
printk("%d pages nonshared\n",nonshared);
printk("%d pages shared\n",shared);
printk("%d pages swap cached\n",cached);
printk("%ld pages in page table cache\n",pgtable_cache_size);
show_buffers();
}
extern void init_pointer_table(unsigned long ptable);
/* References to section boundaries */
extern char _text, _etext, _edata, __bss_start, _end;
extern char __init_begin, __init_end;
extern pmd_t *zero_pgtable;
void __init mem_init(void)
{
int codepages = 0;
int datapages = 0;
int initpages = 0;
unsigned long tmp;
int i;
max_mapnr = num_physpages = MAP_NR(high_memory);
#ifdef CONFIG_ATARI
if (MACH_IS_ATARI)
atari_stram_reserve_pages( start_mem );
#endif
#ifdef CONFIG_SUN3
/* reserve rom pages */
mmu_emu_reserve_pages(max_mapnr);
#endif
/* this will put all memory onto the freelists */
totalram_pages = free_all_bootmem();
printk("tp:%ld\n", totalram_pages);
for (tmp = PAGE_OFFSET ; tmp < (unsigned long)high_memory; tmp += PAGE_SIZE) {
#if 0
#ifndef CONFIG_SUN3
if (virt_to_phys ((void *)tmp) >= mach_max_dma_address)
clear_bit(PG_DMA, &virt_to_page(tmp)->flags);
#endif
#endif
if (PageReserved(virt_to_page(tmp))) {
if (tmp >= (unsigned long)&_text
&& tmp < (unsigned long)&_etext)
codepages++;
else if (tmp >= (unsigned long) &__init_begin
&& tmp < (unsigned long) &__init_end)
initpages++;
else
datapages++;
continue;
}
#if 0
set_page_count(virt_to_page(tmp), 1);
#ifdef CONFIG_BLK_DEV_INITRD
if (!initrd_start ||
(tmp < (initrd_start & PAGE_MASK) || tmp >= initrd_end))
#endif
free_page(tmp);
#endif
}
#ifndef CONFIG_SUN3
/* insert pointer tables allocated so far into the tablelist */
init_pointer_table((unsigned long)kernel_pg_dir);
for (i = 0; i < PTRS_PER_PGD; i++) {
if (pgd_present(kernel_pg_dir[i]))
init_pointer_table(__pgd_page(kernel_pg_dir[i]));
}
/* insert also pointer table that we used to unmap the zero page */
if (zero_pgtable)
init_pointer_table((unsigned long)zero_pgtable);
#endif
printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
(unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
max_mapnr << (PAGE_SHIFT-10),
codepages << (PAGE_SHIFT-10),
datapages << (PAGE_SHIFT-10),
initpages << (PAGE_SHIFT-10));
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
set_page_count(virt_to_page(start), 1);
free_page(start);
totalram_pages++;
}
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
void si_meminfo(struct sysinfo *val)
{
unsigned long i;
i = max_mapnr;
val->totalram = totalram_pages;
val->sharedram = 0;
val->freeram = nr_free_pages();
val->bufferram = atomic_read(&buffermem_pages);
while (i-- > 0) {
if (PageReserved(mem_map+i))
continue;
val->totalram++;
if (!page_count(mem_map+i))
continue;
val->sharedram += page_count(mem_map+i) - 1;
}
val->totalhigh = 0;
val->freehigh = 0;
return;
}
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