arch/microblaze/mm/init.c - kernel/common - Git at Google

 /*
  * Copyright (C) 2007-2008 Michal Simek <[email protected]>
  * Copyright (C) 2006 Atmark Techno, Inc.
  *
  * 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.
  */

 #include <linux/bootmem.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/lmb.h>
 #include <linux/mm.h> /* mem_init */
 #include <linux/initrd.h>
 #include <linux/pagemap.h>
 #include <linux/pfn.h>
 #include <linux/swap.h>

 #include <asm/page.h>
 #include <asm/mmu_context.h>
 #include <asm/pgalloc.h>
 #include <asm/sections.h>
 #include <asm/tlb.h>

 #ifndef CONFIG_MMU
 unsigned int __page_offset;
 EXPORT_SYMBOL(__page_offset);

 #else
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

 int mem_init_done;
 static int init_bootmem_done;
 #endif /* CONFIG_MMU */

 char *klimit = _end;

 /*
  * Initialize the bootmem system and give it all the memory we
  * have available.
  */
 unsigned long memory_start;
 EXPORT_SYMBOL(memory_start);
 unsigned long memory_end; /* due to mm/nommu.c */
 unsigned long memory_size;

 /*
  * paging_init() sets up the page tables - in fact we've already done this.
  */
 static void __init paging_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES];

 	/* Clean every zones */
 	memset(zones_size, 0, sizeof(zones_size));

 	/*
 	 * old: we can DMA to/from any address.put all page into ZONE_DMA
 	 * We use only ZONE_NORMAL
 	 */
 	zones_size[ZONE_NORMAL] = max_mapnr;

 	free_area_init(zones_size);
 }

 void __init setup_memory(void)
 {
 	int i;
 	unsigned long map_size;
 #ifndef CONFIG_MMU
 	u32 kernel_align_start, kernel_align_size;

 	/* Find main memory where is the kernel */
 	for (i = 0; i < lmb.memory.cnt; i++) {
 		memory_start = (u32) lmb.memory.region[i].base;
 		memory_end = (u32) lmb.memory.region[i].base
 				+ (u32) lmb.memory.region[i].size;
 		if ((memory_start <= (u32)_text) &&
 					((u32)_text <= memory_end)) {
 			memory_size = memory_end - memory_start;
 			PAGE_OFFSET = memory_start;
 			printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
 				"size 0x%08x\n", __func__, (u32) memory_start,
 					(u32) memory_end, (u32) memory_size);
 			break;
 		}
 	}

 	if (!memory_start || !memory_end) {
 		panic("%s: Missing memory setting 0x%08x-0x%08x\n",
 			__func__, (u32) memory_start, (u32) memory_end);
 	}

 	/* reservation of region where is the kernel */
 	kernel_align_start = PAGE_DOWN((u32)_text);
 	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
 	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
 	lmb_reserve(kernel_align_start, kernel_align_size);
 	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
 		__func__, kernel_align_start, kernel_align_start
 			+ kernel_align_size, kernel_align_size);

 #endif
 	/*
 	 * Kernel:
 	 * start: base phys address of kernel - page align
 	 * end: base phys address of kernel - page align
 	 *
 	 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
 	 * max_low_pfn
 	 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
 	 * num_physpages - number of all pages
 	 */

 	/* memory start is from the kernel end (aligned) to higher addr */
 	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
 	/* RAM is assumed contiguous */
 	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
 	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;

 	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
 	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
 	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);

 	/*
 	 * Find an area to use for the bootmem bitmap.
 	 * We look for the first area which is at least
 	 * 128kB in length (128kB is enough for a bitmap
 	 * for 4GB of memory, using 4kB pages), plus 1 page
 	 * (in case the address isn't page-aligned).
 	 */
 #ifndef CONFIG_MMU
 	map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)),
 					min_low_pfn, max_low_pfn);
 #else
 	map_size = init_bootmem_node(&contig_page_data,
 		PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
 #endif
 	lmb_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);

 	/* free bootmem is whole main memory */
 	free_bootmem(memory_start, memory_size);

 	/* reserve allocate blocks */
 	for (i = 0; i < lmb.reserved.cnt; i++) {
 		pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
 			(u32) lmb.reserved.region[i].base,
 			(u32) lmb_size_bytes(&lmb.reserved, i));
 		reserve_bootmem(lmb.reserved.region[i].base,
 			lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
 	}
 #ifdef CONFIG_MMU
 	init_bootmem_done = 1;
 #endif
 	paging_init();
 }

 void free_init_pages(char *what, unsigned long begin, unsigned long end)
 {
 	unsigned long addr;

 	for (addr = begin; addr < end; addr += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(addr));
 		init_page_count(virt_to_page(addr));
 		memset((void *)addr, 0xcc, PAGE_SIZE);
 		free_page(addr);
 		totalram_pages++;
 	}
 	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
 }

 #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",
 					(int)(pages * (PAGE_SIZE / 1024)));
 }
 #endif

 void free_initmem(void)
 {
 	free_init_pages("unused kernel memory",
 			(unsigned long)(&__init_begin),
 			(unsigned long)(&__init_end));
 }

 /* FIXME from arch/powerpc/mm/mem.c*/
 void show_mem(void)
 {
 	printk(KERN_NOTICE "%s\n", __func__);
 }

 void __init mem_init(void)
 {
 	high_memory = (void *)__va(memory_end);
 	/* this will put all memory onto the freelists */
 	totalram_pages += free_all_bootmem();

 	printk(KERN_INFO "Memory: %luk/%luk available\n",
 	       nr_free_pages() << (PAGE_SHIFT-10),
 	       num_physpages << (PAGE_SHIFT-10));
 #ifdef CONFIG_MMU
 	mem_init_done = 1;
 #endif
 }

 #ifndef CONFIG_MMU
 /* Check against bounds of physical memory */
 int ___range_ok(unsigned long addr, unsigned long size)
 {
 	return ((addr < memory_start) ||
 		((addr + size) > memory_end));
 }
 EXPORT_SYMBOL(___range_ok);

 #else
 int page_is_ram(unsigned long pfn)
 {
 	return pfn < max_low_pfn;
 }

 /*
  * Check for command-line options that affect what MMU_init will do.
  */
 static void mm_cmdline_setup(void)
 {
 	unsigned long maxmem = 0;
 	char *p = cmd_line;

 	/* Look for mem= option on command line */
 	p = strstr(cmd_line, "mem=");
 	if (p) {
 		p += 4;
 		maxmem = memparse(p, &p);
 		if (maxmem && memory_size > maxmem) {
 			memory_size = maxmem;
 			memory_end = memory_start + memory_size;
 			lmb.memory.region[0].size = memory_size;
 		}
 	}
 }

 /*
  * MMU_init_hw does the chip-specific initialization of the MMU hardware.
  */
 static void __init mmu_init_hw(void)
 {
 	/*
 	 * The Zone Protection Register (ZPR) defines how protection will
 	 * be applied to every page which is a member of a given zone. At
 	 * present, we utilize only two of the zones.
 	 * The zone index bits (of ZSEL) in the PTE are used for software
 	 * indicators, except the LSB.  For user access, zone 1 is used,
 	 * for kernel access, zone 0 is used.  We set all but zone 1
 	 * to zero, allowing only kernel access as indicated in the PTE.
 	 * For zone 1, we set a 01 binary (a value of 10 will not work)
 	 * to allow user access as indicated in the PTE.  This also allows
 	 * kernel access as indicated in the PTE.
 	 */
 	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
 			"mts rzpr, r11;"
 			: : : "r11");
 }

 /*
  * MMU_init sets up the basic memory mappings for the kernel,
  * including both RAM and possibly some I/O regions,
  * and sets up the page tables and the MMU hardware ready to go.
  */

 /* called from head.S */
 asmlinkage void __init mmu_init(void)
 {
 	unsigned int kstart, ksize;

 	if (!lmb.reserved.cnt) {
 		printk(KERN_EMERG "Error memory count\n");
 		machine_restart(NULL);
 	}

 	if ((u32) lmb.memory.region[0].size < 0x1000000) {
 		printk(KERN_EMERG "Memory must be greater than 16MB\n");
 		machine_restart(NULL);
 	}
 	/* Find main memory where the kernel is */
 	memory_start = (u32) lmb.memory.region[0].base;
 	memory_end = (u32) lmb.memory.region[0].base +
 				(u32) lmb.memory.region[0].size;
 	memory_size = memory_end - memory_start;

 	mm_cmdline_setup(); /* FIXME parse args from command line - not used */

 	/*
 	 * Map out the kernel text/data/bss from the available physical
 	 * memory.
 	 */
 	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
 	/* kernel size */
 	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
 	lmb_reserve(kstart, ksize);

 #if defined(CONFIG_BLK_DEV_INITRD)
 	/* Remove the init RAM disk from the available memory. */
 /*	if (initrd_start) {
 		mem_pieces_remove(&phys_avail, __pa(initrd_start),
 				  initrd_end - initrd_start, 1);
 	}*/
 #endif /* CONFIG_BLK_DEV_INITRD */

 	/* Initialize the MMU hardware */
 	mmu_init_hw();

 	/* Map in all of RAM starting at CONFIG_KERNEL_START */
 	mapin_ram();

 #ifdef HIGHMEM_START_BOOL
 	ioremap_base = HIGHMEM_START;
 #else
 	ioremap_base = 0xfe000000UL;	/* for now, could be 0xfffff000 */
 #endif /* CONFIG_HIGHMEM */
 	ioremap_bot = ioremap_base;

 	/* Initialize the context management stuff */
 	mmu_context_init();
 }

 /* This is only called until mem_init is done. */
 void __init *early_get_page(void)
 {
 	void *p;
 	if (init_bootmem_done) {
 		p = alloc_bootmem_pages(PAGE_SIZE);
 	} else {
 		/*
 		 * Mem start + 32MB -> here is limit
 		 * because of mem mapping from head.S
 		 */
 		p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
 					memory_start + 0x2000000));
 	}
 	return p;
 }
 #endif /* CONFIG_MMU */
	/*
	* Copyright (C) 2007-2008 Michal Simek <[email protected]>
	* Copyright (C) 2006 Atmark Techno, Inc.
	*
	* 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.
	*/

	#include <linux/bootmem.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/lmb.h>
	#include <linux/mm.h> /* mem_init */
	#include <linux/initrd.h>
	#include <linux/pagemap.h>
	#include <linux/pfn.h>
	#include <linux/swap.h>

	#include <asm/page.h>
	#include <asm/mmu_context.h>
	#include <asm/pgalloc.h>
	#include <asm/sections.h>
	#include <asm/tlb.h>

	#ifndef CONFIG_MMU
	unsigned int __page_offset;
	EXPORT_SYMBOL(__page_offset);

	#else
	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

	int mem_init_done;
	static int init_bootmem_done;
	#endif /* CONFIG_MMU */

	char *klimit = _end;

	/*
	* Initialize the bootmem system and give it all the memory we
	* have available.
	*/
	unsigned long memory_start;
	EXPORT_SYMBOL(memory_start);
	unsigned long memory_end; /* due to mm/nommu.c */
	unsigned long memory_size;

	/*
	* paging_init() sets up the page tables - in fact we've already done this.
	*/
	static void __init paging_init(void)
	{
	unsigned long zones_size[MAX_NR_ZONES];

	/* Clean every zones */
	memset(zones_size, 0, sizeof(zones_size));

	/*
	* old: we can DMA to/from any address.put all page into ZONE_DMA
	* We use only ZONE_NORMAL
	*/
	zones_size[ZONE_NORMAL] = max_mapnr;

	free_area_init(zones_size);
	}

	void __init setup_memory(void)
	{
	int i;
	unsigned long map_size;
	#ifndef CONFIG_MMU
	u32 kernel_align_start, kernel_align_size;

	/* Find main memory where is the kernel */
	for (i = 0; i < lmb.memory.cnt; i++) {
	memory_start = (u32) lmb.memory.region[i].base;
	memory_end = (u32) lmb.memory.region[i].base
	+ (u32) lmb.memory.region[i].size;
	if ((memory_start <= (u32)_text) &&
	((u32)_text <= memory_end)) {
	memory_size = memory_end - memory_start;
	PAGE_OFFSET = memory_start;
	printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
	"size 0x%08x\n", __func__, (u32) memory_start,
	(u32) memory_end, (u32) memory_size);
	break;
	}
	}

	if (!memory_start \|\| !memory_end) {
	panic("%s: Missing memory setting 0x%08x-0x%08x\n",
	__func__, (u32) memory_start, (u32) memory_end);
	}

	/* reservation of region where is the kernel */
	kernel_align_start = PAGE_DOWN((u32)_text);
	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
	lmb_reserve(kernel_align_start, kernel_align_size);
	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
	__func__, kernel_align_start, kernel_align_start
	+ kernel_align_size, kernel_align_size);

	#endif
	/*
	* Kernel:
	* start: base phys address of kernel - page align
	* end: base phys address of kernel - page align
	*
	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	* max_low_pfn
	* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	* num_physpages - number of all pages
	*/

	/* memory start is from the kernel end (aligned) to higher addr */
	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	/* RAM is assumed contiguous */
	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;

	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);

	/*
	* Find an area to use for the bootmem bitmap.
	* We look for the first area which is at least
	* 128kB in length (128kB is enough for a bitmap
	* for 4GB of memory, using 4kB pages), plus 1 page
	* (in case the address isn't page-aligned).
	*/
	#ifndef CONFIG_MMU
	map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)),
	min_low_pfn, max_low_pfn);
	#else
	map_size = init_bootmem_node(&contig_page_data,
	PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
	#endif
	lmb_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);

	/* free bootmem is whole main memory */
	free_bootmem(memory_start, memory_size);

	/* reserve allocate blocks */
	for (i = 0; i < lmb.reserved.cnt; i++) {
	pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
	(u32) lmb.reserved.region[i].base,
	(u32) lmb_size_bytes(&lmb.reserved, i));
	reserve_bootmem(lmb.reserved.region[i].base,
	lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
	}
	#ifdef CONFIG_MMU
	init_bootmem_done = 1;
	#endif
	paging_init();
	}

	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	{
	unsigned long addr;

	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	ClearPageReserved(virt_to_page(addr));
	init_page_count(virt_to_page(addr));
	memset((void *)addr, 0xcc, PAGE_SIZE);
	free_page(addr);
	totalram_pages++;
	}
	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	}

	#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",
	(int)(pages * (PAGE_SIZE / 1024)));
	}
	#endif

	void free_initmem(void)
	{
	free_init_pages("unused kernel memory",
	(unsigned long)(&__init_begin),
	(unsigned long)(&__init_end));
	}

	/* FIXME from arch/powerpc/mm/mem.c*/
	void show_mem(void)
	{
	printk(KERN_NOTICE "%s\n", __func__);
	}

	void __init mem_init(void)
	{
	high_memory = (void *)__va(memory_end);
	/* this will put all memory onto the freelists */
	totalram_pages += free_all_bootmem();

	printk(KERN_INFO "Memory: %luk/%luk available\n",
	nr_free_pages() << (PAGE_SHIFT-10),
	num_physpages << (PAGE_SHIFT-10));
	#ifdef CONFIG_MMU
	mem_init_done = 1;
	#endif
	}

	#ifndef CONFIG_MMU
	/* Check against bounds of physical memory */
	int ___range_ok(unsigned long addr, unsigned long size)
	{
	return ((addr < memory_start) \|\|
	((addr + size) > memory_end));
	}
	EXPORT_SYMBOL(___range_ok);

	#else
	int page_is_ram(unsigned long pfn)
	{
	return pfn < max_low_pfn;
	}

	/*
	* Check for command-line options that affect what MMU_init will do.
	*/
	static void mm_cmdline_setup(void)
	{
	unsigned long maxmem = 0;
	char *p = cmd_line;

	/* Look for mem= option on command line */
	p = strstr(cmd_line, "mem=");
	if (p) {
	p += 4;
	maxmem = memparse(p, &p);
	if (maxmem && memory_size > maxmem) {
	memory_size = maxmem;
	memory_end = memory_start + memory_size;
	lmb.memory.region[0].size = memory_size;
	}
	}
	}

	/*
	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	*/
	static void __init mmu_init_hw(void)
	{
	/*
	* The Zone Protection Register (ZPR) defines how protection will
	* be applied to every page which is a member of a given zone. At
	* present, we utilize only two of the zones.
	* The zone index bits (of ZSEL) in the PTE are used for software
	* indicators, except the LSB. For user access, zone 1 is used,
	* for kernel access, zone 0 is used. We set all but zone 1
	* to zero, allowing only kernel access as indicated in the PTE.
	* For zone 1, we set a 01 binary (a value of 10 will not work)
	* to allow user access as indicated in the PTE. This also allows
	* kernel access as indicated in the PTE.
	*/
	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	"mts rzpr, r11;"
	: : : "r11");
	}

	/*
	* MMU_init sets up the basic memory mappings for the kernel,
	* including both RAM and possibly some I/O regions,
	* and sets up the page tables and the MMU hardware ready to go.
	*/

	/* called from head.S */
	asmlinkage void __init mmu_init(void)
	{
	unsigned int kstart, ksize;

	if (!lmb.reserved.cnt) {
	printk(KERN_EMERG "Error memory count\n");
	machine_restart(NULL);
	}

	if ((u32) lmb.memory.region[0].size < 0x1000000) {
	printk(KERN_EMERG "Memory must be greater than 16MB\n");
	machine_restart(NULL);
	}
	/* Find main memory where the kernel is */
	memory_start = (u32) lmb.memory.region[0].base;
	memory_end = (u32) lmb.memory.region[0].base +
	(u32) lmb.memory.region[0].size;
	memory_size = memory_end - memory_start;

	mm_cmdline_setup(); /* FIXME parse args from command line - not used */

	/*
	* Map out the kernel text/data/bss from the available physical
	* memory.
	*/
	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
	/* kernel size */
	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
	lmb_reserve(kstart, ksize);

	#if defined(CONFIG_BLK_DEV_INITRD)
	/* Remove the init RAM disk from the available memory. */
	/* if (initrd_start) {
	mem_pieces_remove(&phys_avail, __pa(initrd_start),
	initrd_end - initrd_start, 1);
	}*/
	#endif /* CONFIG_BLK_DEV_INITRD */

	/* Initialize the MMU hardware */
	mmu_init_hw();

	/* Map in all of RAM starting at CONFIG_KERNEL_START */
	mapin_ram();

	#ifdef HIGHMEM_START_BOOL
	ioremap_base = HIGHMEM_START;
	#else
	ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
	#endif /* CONFIG_HIGHMEM */
	ioremap_bot = ioremap_base;

	/* Initialize the context management stuff */
	mmu_context_init();
	}

	/* This is only called until mem_init is done. */
	void __init *early_get_page(void)
	{
	void *p;
	if (init_bootmem_done) {
	p = alloc_bootmem_pages(PAGE_SIZE);
	} else {
	/*
	* Mem start + 32MB -> here is limit
	* because of mem mapping from head.S
	*/
	p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
	memory_start + 0x2000000));
	}
	return p;
	}
	#endif /* CONFIG_MMU */