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/* $Id: init.c,v 1.19 2001/10/01 02:21:50 gniibe Exp $
*
* linux/arch/sh/mm/init.c
*
* Copyright (C) 1999 Niibe Yutaka
*
* Based on linux/arch/i386/mm/init.c:
* Copyright (C) 1995 Linus Torvalds
*/
#include <linux/config.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/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/blk.h>
#endif
#include <linux/highmem.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/mmu_context.h>
#include <asm/io.h>
#include <asm/tlb.h>
mmu_gather_t mmu_gathers[NR_CPUS];
/*
* Cache of MMU context last used.
*/
unsigned long mmu_context_cache;
#ifdef CONFIG_DISCONTIGMEM
pg_data_t discontig_page_data[NR_NODES];
bootmem_data_t discontig_node_bdata[NR_NODES];
#endif
static unsigned long totalram_pages;
static unsigned long totalhigh_pages;
void show_mem(void)
{
int i, 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))
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);
show_buffers();
}
/* References to section boundaries */
extern char _text, _etext, _edata, __bss_start, _end;
extern char __init_begin, __init_end;
pgd_t swapper_pg_dir[PTRS_PER_PGD];
/* It'd be good if these lines were in the standard header file. */
#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
/*
* paging_init() sets up the page tables
*
* This routines also unmaps the page at virtual kernel address 0, so
* that we can trap those pesky NULL-reference errors in the kernel.
*/
void __init paging_init(void)
{
int i;
pgd_t * pg_dir;
/* We don't need kernel mapping as hardware support that. */
pg_dir = swapper_pg_dir;
for (i=0; i < PTRS_PER_PGD; i++)
pgd_val(pg_dir[i]) = 0;
/* Enable MMU */
ctrl_outl(MMU_CONTROL_INIT, MMUCR);
/* The manual suggests doing some nops after turning on the MMU */
asm volatile("nop;nop;nop;nop;nop;nop;");
mmu_context_cache = MMU_CONTEXT_FIRST_VERSION;
set_asid(mmu_context_cache & MMU_CONTEXT_ASID_MASK);
{
unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
unsigned long max_dma, low, start_pfn;
start_pfn = START_PFN;
max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
low = MAX_LOW_PFN;
if (low < max_dma)
zones_size[ZONE_DMA] = low - start_pfn;
else {
zones_size[ZONE_DMA] = max_dma - start_pfn;
zones_size[ZONE_NORMAL] = low - max_dma;
}
free_area_init_node(0, NODE_DATA(0), 0, zones_size, __MEMORY_START, 0);
#ifdef CONFIG_DISCONTIGMEM
zones_size[ZONE_DMA] = __MEMORY_SIZE_2ND >> PAGE_SHIFT;
zones_size[ZONE_NORMAL] = 0;
free_area_init_node(1, NODE_DATA(1), 0, zones_size, __MEMORY_START_2ND, 0);
#endif
}
}
void __init mem_init(void)
{
extern unsigned long empty_zero_page[1024];
int codesize, reservedpages, datasize, initsize;
int tmp;
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);
__flush_wback_region(empty_zero_page, PAGE_SIZE);
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem_node(NODE_DATA(0));
#ifdef CONFIG_DISCONTIGMEM
totalram_pages += free_all_bootmem_node(NODE_DATA(1));
#endif
reservedpages = 0;
for (tmp = 0; tmp < num_physpages; tmp++)
/*
* Only count reserved RAM pages
*/
if (PageReserved(mem_map+tmp))
reservedpages++;
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
max_mapnr << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 10);
p3_cache_init();
}
void free_initmem(void)
{
unsigned long addr;
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
free_page(addr);
totalram_pages++;
}
printk ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
set_page_count(virt_to_page(p), 1);
free_page(p);
totalram_pages++;
}
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
void si_meminfo(struct sysinfo *val)
{
val->totalram = totalram_pages;
val->sharedram = 0;
val->freeram = nr_free_pages();
val->bufferram = atomic_read(&buffermem_pages);
val->totalhigh = totalhigh_pages;
val->freehigh = nr_free_highpages();
val->mem_unit = PAGE_SIZE;
return;
}
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