arch/blackfin/mm/init.c - linux - Git at Google

 /*
  * File:         arch/blackfin/mm/init.c
  * Based on:
  * Author:
  *
  * Created:
  * Description:
  *
  * Modified:
  *               Copyright 2004-2007 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 <linux/uaccess.h>
 #include <asm/bfin-global.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 __init 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_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 		zones_size[ZONE_NORMAL] = 0;
 #ifdef CONFIG_HIGHMEM
 		zones_size[ZONE_HIGHMEM] = 0;
 #endif
 		free_area_init(zones_size);
 	}
 }

 void __init mem_init(void)
 {
 	unsigned int codek = 0, datak = 0, initk = 0;
 	unsigned int reservedpages = 0, freepages = 0;
 	unsigned long tmp;
 	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_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);

 	/* This will put all memory onto the freelists. */
 	totalram_pages = free_all_bootmem();

 	reservedpages = 0;
 	for (tmp = 0; tmp < max_mapnr; tmp++)
 		if (PageReserved(pfn_to_page(tmp)))
 			reservedpages++;
 	freepages =  max_mapnr - reservedpages;

 	/* do not count in kernel image between _rambase and _ramstart */
 	reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 	reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
 #endif

 	codek = (_etext - _stext) >> 10;
 	initk = (__init_end - __init_begin) >> 10;
 	datak = ((_ramstart - _rambase) >> 10) - codek - initk;

 	printk(KERN_INFO
 	     "Memory available: %luk/%luk RAM, "
 		"(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
 		(unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10,
 		initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-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");
 	}
 }

 static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
 {
 	unsigned long addr;
 	/* next to check that the page we free is not a partial page */
 	for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(addr));
 		init_page_count(virt_to_page(addr));
 		free_page(addr);
 		totalram_pages++;
 	}
 	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
 }

 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
 #ifndef CONFIG_MPU
 	free_init_pages("initrd memory", start, end);
 #endif
 }
 #endif

 void __init_refok free_initmem(void)
 {
 #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
 	free_init_pages("unused kernel memory",
 			(unsigned long)(&__init_begin),
 			(unsigned long)(&__init_end));
 #endif
 }
	/*
	* File: arch/blackfin/mm/init.c
	* Based on:
	* Author:
	*
	* Created:
	* Description:
	*
	* Modified:
	* Copyright 2004-2007 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 <linux/uaccess.h>
	#include <asm/bfin-global.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 __init 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_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
	zones_size[ZONE_NORMAL] = 0;
	#ifdef CONFIG_HIGHMEM
	zones_size[ZONE_HIGHMEM] = 0;
	#endif
	free_area_init(zones_size);
	}
	}

	void __init mem_init(void)
	{
	unsigned int codek = 0, datak = 0, initk = 0;
	unsigned int reservedpages = 0, freepages = 0;
	unsigned long tmp;
	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_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);

	/* This will put all memory onto the freelists. */
	totalram_pages = free_all_bootmem();

	reservedpages = 0;
	for (tmp = 0; tmp < max_mapnr; tmp++)
	if (PageReserved(pfn_to_page(tmp)))
	reservedpages++;
	freepages = max_mapnr - reservedpages;

	/* do not count in kernel image between _rambase and _ramstart */
	reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
	#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
	reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
	#endif

	codek = (_etext - _stext) >> 10;
	initk = (__init_end - __init_begin) >> 10;
	datak = ((_ramstart - _rambase) >> 10) - codek - initk;

	printk(KERN_INFO
	"Memory available: %luk/%luk RAM, "
	"(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
	(unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10,
	initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-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");
	}
	}

	static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
	{
	unsigned long addr;
	/* next to check that the page we free is not a partial page */
	for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
	ClearPageReserved(virt_to_page(addr));
	init_page_count(virt_to_page(addr));
	free_page(addr);
	totalram_pages++;
	}
	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	}

	#ifdef CONFIG_BLK_DEV_INITRD
	void __init free_initrd_mem(unsigned long start, unsigned long end)
	{
	#ifndef CONFIG_MPU
	free_init_pages("initrd memory", start, end);
	#endif
	}
	#endif

	void __init_refok free_initmem(void)
	{
	#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
	free_init_pages("unused kernel memory",
	(unsigned long)(&__init_begin),
	(unsigned long)(&__init_end));
	#endif
	}