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/*
* File: arch/blackfin/mm/init.c
* Based on:
* Author:
*
* Created:
* Description:
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/swap.h>
#include <linux/bootmem.h>
#include <asm/bfin-global.h>
#include <asm/uaccess.h>
#include <asm/l1layout.h>
#include "blackfin_sram.h"
/*
* 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 a 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.
*/
static unsigned long empty_bad_page_table;
static unsigned long empty_bad_page;
unsigned long empty_zero_page;
void show_mem(void)
{
unsigned long i;
int free = 0, total = 0, reserved = 0, shared = 0;
int cached = 0;
printk(KERN_INFO "Mem-info:\n");
show_free_areas();
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(KERN_INFO "%d pages of RAM\n", total);
printk(KERN_INFO "%d free pages\n", free);
printk(KERN_INFO "%d reserved pages\n", reserved);
printk(KERN_INFO "%d pages shared\n", shared);
printk(KERN_INFO "%d pages swap cached\n", cached);
}
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/head.S.
* The parameters are pointers to where to stick the starting and ending
* addresses of available kernel virtual memory.
*/
void paging_init(void)
{
/*
* make sure start_mem is page aligned, otherwise bootmem and
* page_alloc get different views og the world
*/
unsigned long end_mem = memory_end & PAGE_MASK;
pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
/*
* initialize the bad page table and bad page to point
* to a couple of allocated pages
*/
empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
/*
* Set up SFC/DFC registers (user data space)
*/
set_fs(KERNEL_DS);
pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n",
PAGE_ALIGN(memory_start), end_mem);
{
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
zones_size[ZONE_HIGHMEM] = 0;
#endif
free_area_init(zones_size);
}
}
void mem_init(void)
{
unsigned int codek = 0, datak = 0, initk = 0;
unsigned long tmp;
unsigned int len = _ramend - _rambase;
unsigned long start_mem = memory_start;
unsigned long end_mem = memory_end;
end_mem &= PAGE_MASK;
high_memory = (void *)end_mem;
start_mem = PAGE_ALIGN(start_mem);
max_mapnr = num_physpages = MAP_NR(high_memory);
printk(KERN_INFO "Physical pages: %lx\n", num_physpages);
/* This will put all memory onto the freelists. */
totalram_pages = free_all_bootmem();
codek = (_etext - _stext) >> 10;
datak = (__bss_stop - __bss_start) >> 10;
initk = (__init_end - __init_begin) >> 10;
tmp = nr_free_pages() << PAGE_SHIFT;
printk(KERN_INFO
"Memory available: %luk/%uk RAM, (%uk init code, %uk kernel code, %uk data, %uk dma)\n",
tmp >> 10, len >> 10, initk, codek, datak, DMA_UNCACHED_REGION >> 10);
/* Initialize the blackfin L1 Memory. */
l1sram_init();
l1_data_sram_init();
l1_inst_sram_init();
/* Allocate this once; never free it. We assume this gives us a
pointer to the start of L1 scratchpad memory; panic if it
doesn't. */
tmp = (unsigned long)l1sram_alloc(sizeof(struct l1_scratch_task_info));
if (tmp != (unsigned long)L1_SCRATCH_TASK_INFO) {
printk(KERN_EMERG "mem_init(): Did not get the right address from l1sram_alloc: %08lx != %08lx\n",
tmp, (unsigned long)L1_SCRATCH_TASK_INFO);
panic("No L1, time to give up\n");
}
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
int pages = 0;
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
pages++;
}
printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
}
#endif
void free_initmem(void)
{
#ifdef CONFIG_RAMKERNEL
unsigned long addr;
/*
* the following code should be cool even if these sections
* are not page aligned.
*/
addr = PAGE_ALIGN((unsigned long)(__init_begin));
/* next to check that the page we free is not a partial page */
for (; addr + PAGE_SIZE < (unsigned long)(__init_end);
addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
printk(KERN_NOTICE
"Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
(addr - PAGE_ALIGN((long)__init_begin)) >> 10,
(int)(PAGE_ALIGN((unsigned long)(__init_begin))),
(int)(addr - PAGE_SIZE));
#endif
}
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