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

 /*
  * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
  * 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/dma-map-ops.h>
 #include <linux/memblock.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mm.h> /* mem_init */
 #include <linux/initrd.h>
 #include <linux/pagemap.h>
 #include <linux/pfn.h>
 #include <linux/slab.h>
 #include <linux/swap.h>
 #include <linux/export.h>

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

 /* Use for MMU and noMMU because of PCI generic code */
 int mem_init_done;

 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_size;
 EXPORT_SYMBOL(memory_size);
 unsigned long lowmem_size;

 EXPORT_SYMBOL(min_low_pfn);
 EXPORT_SYMBOL(max_low_pfn);

 #ifdef CONFIG_HIGHMEM
 static void __init highmem_init(void)
 {
 	pr_debug("%x\n", (u32)PKMAP_BASE);
 	map_page(PKMAP_BASE, 0, 0);	/* XXX gross */
 	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
 }

 static void __meminit highmem_setup(void)
 {
 	unsigned long pfn;

 	for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
 		struct page *page = pfn_to_page(pfn);

 		/* FIXME not sure about */
 		if (!memblock_is_reserved(pfn << PAGE_SHIFT))
 			free_highmem_page(page);
 	}
 }
 #endif /* CONFIG_HIGHMEM */

 /*
  * 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];
 	int idx;

 	/* Setup fixmaps */
 	for (idx = 0; idx < __end_of_fixed_addresses; idx++)
 		clear_fixmap(idx);

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

 #ifdef CONFIG_HIGHMEM
 	highmem_init();

 	zones_size[ZONE_DMA] = max_low_pfn;
 	zones_size[ZONE_HIGHMEM] = max_pfn;
 #else
 	zones_size[ZONE_DMA] = max_pfn;
 #endif

 	/* We don't have holes in memory map */
 	free_area_init(zones_size);
 }

 void __init setup_memory(void)
 {
 	/*
 	 * 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)
 	 */

 	/* 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 */
 	max_mapnr = memory_size >> PAGE_SHIFT;
 	max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
 	max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;

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

 	paging_init();
 }

 void __init mem_init(void)
 {
 	high_memory = (void *)__va(memory_start + lowmem_size - 1);

 	/* this will put all memory onto the freelists */
 	memblock_free_all();
 #ifdef CONFIG_HIGHMEM
 	highmem_setup();
 #endif

 	mem_init_done = 1;
 }

 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;
 			memblock.memory.regions[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 (!memblock.reserved.cnt) {
 		pr_emerg("Error memory count\n");
 		machine_restart(NULL);
 	}

 	if ((u32) memblock.memory.regions[0].size < 0x400000) {
 		pr_emerg("Memory must be greater than 4MB\n");
 		machine_restart(NULL);
 	}

 	if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
 		pr_emerg("Kernel size is greater than memory node\n");
 		machine_restart(NULL);
 	}

 	/* Find main memory where the kernel is */
 	memory_start = (u32) memblock.memory.regions[0].base;
 	lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;

 	if (lowmem_size > CONFIG_LOWMEM_SIZE) {
 		lowmem_size = CONFIG_LOWMEM_SIZE;
 #ifndef CONFIG_HIGHMEM
 		memory_size = lowmem_size;
 #endif
 	}

 	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));
 	memblock_reserve(kstart, ksize);

 #if defined(CONFIG_BLK_DEV_INITRD)
 	/* Remove the init RAM disk from the available memory. */
 	if (initrd_start) {
 		unsigned long size;
 		size = initrd_end - initrd_start;
 		memblock_reserve(__virt_to_phys(initrd_start), size);
 	}
 #endif /* CONFIG_BLK_DEV_INITRD */

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

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

 	/* Extend vmalloc and ioremap area as big as possible */
 #ifdef CONFIG_HIGHMEM
 	ioremap_base = ioremap_bot = PKMAP_BASE;
 #else
 	ioremap_base = ioremap_bot = FIXADDR_START;
 #endif

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

 	/* Shortly after that, the entire linear mapping will be available */
 	/* This will also cause that unflatten device tree will be allocated
 	 * inside 768MB limit */
 	memblock_set_current_limit(memory_start + lowmem_size - 1);

 	parse_early_param();

 	/* CMA initialization */
 	dma_contiguous_reserve(memory_start + lowmem_size - 1);
 }

 void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
 {
 	void *p;

 	if (mem_init_done) {
 		p = kzalloc(size, mask);
 	} else {
 		p = memblock_alloc(size, SMP_CACHE_BYTES);
 		if (!p)
 			panic("%s: Failed to allocate %zu bytes\n",
 			      __func__, size);
 	}

 	return p;
 }
	/*
	* Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
	* 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/dma-map-ops.h>
	#include <linux/memblock.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/mm.h> /* mem_init */
	#include <linux/initrd.h>
	#include <linux/pagemap.h>
	#include <linux/pfn.h>
	#include <linux/slab.h>
	#include <linux/swap.h>
	#include <linux/export.h>

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

	/* Use for MMU and noMMU because of PCI generic code */
	int mem_init_done;

	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_size;
	EXPORT_SYMBOL(memory_size);
	unsigned long lowmem_size;

	EXPORT_SYMBOL(min_low_pfn);
	EXPORT_SYMBOL(max_low_pfn);

	#ifdef CONFIG_HIGHMEM
	static void __init highmem_init(void)
	{
	pr_debug("%x\n", (u32)PKMAP_BASE);
	map_page(PKMAP_BASE, 0, 0); /* XXX gross */
	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
	}

	static void __meminit highmem_setup(void)
	{
	unsigned long pfn;

	for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
	struct page *page = pfn_to_page(pfn);

	/* FIXME not sure about */
	if (!memblock_is_reserved(pfn << PAGE_SHIFT))
	free_highmem_page(page);
	}
	}
	#endif /* CONFIG_HIGHMEM */

	/*
	* 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];
	int idx;

	/* Setup fixmaps */
	for (idx = 0; idx < __end_of_fixed_addresses; idx++)
	clear_fixmap(idx);

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

	#ifdef CONFIG_HIGHMEM
	highmem_init();

	zones_size[ZONE_DMA] = max_low_pfn;
	zones_size[ZONE_HIGHMEM] = max_pfn;
	#else
	zones_size[ZONE_DMA] = max_pfn;
	#endif

	/* We don't have holes in memory map */
	free_area_init(zones_size);
	}

	void __init setup_memory(void)
	{
	/*
	* 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)
	*/

	/* 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 */
	max_mapnr = memory_size >> PAGE_SHIFT;
	max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
	max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;

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

	paging_init();
	}

	void __init mem_init(void)
	{
	high_memory = (void *)__va(memory_start + lowmem_size - 1);

	/* this will put all memory onto the freelists */
	memblock_free_all();
	#ifdef CONFIG_HIGHMEM
	highmem_setup();
	#endif

	mem_init_done = 1;
	}

	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;
	memblock.memory.regions[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 (!memblock.reserved.cnt) {
	pr_emerg("Error memory count\n");
	machine_restart(NULL);
	}

	if ((u32) memblock.memory.regions[0].size < 0x400000) {
	pr_emerg("Memory must be greater than 4MB\n");
	machine_restart(NULL);
	}

	if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
	pr_emerg("Kernel size is greater than memory node\n");
	machine_restart(NULL);
	}

	/* Find main memory where the kernel is */
	memory_start = (u32) memblock.memory.regions[0].base;
	lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;

	if (lowmem_size > CONFIG_LOWMEM_SIZE) {
	lowmem_size = CONFIG_LOWMEM_SIZE;
	#ifndef CONFIG_HIGHMEM
	memory_size = lowmem_size;
	#endif
	}

	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));
	memblock_reserve(kstart, ksize);

	#if defined(CONFIG_BLK_DEV_INITRD)
	/* Remove the init RAM disk from the available memory. */
	if (initrd_start) {
	unsigned long size;
	size = initrd_end - initrd_start;
	memblock_reserve(__virt_to_phys(initrd_start), size);
	}
	#endif /* CONFIG_BLK_DEV_INITRD */

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

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

	/* Extend vmalloc and ioremap area as big as possible */
	#ifdef CONFIG_HIGHMEM
	ioremap_base = ioremap_bot = PKMAP_BASE;
	#else
	ioremap_base = ioremap_bot = FIXADDR_START;
	#endif

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

	/* Shortly after that, the entire linear mapping will be available */
	/* This will also cause that unflatten device tree will be allocated
	* inside 768MB limit */
	memblock_set_current_limit(memory_start + lowmem_size - 1);

	parse_early_param();

	/* CMA initialization */
	dma_contiguous_reserve(memory_start + lowmem_size - 1);
	}

	void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
	{
	void *p;

	if (mem_init_done) {
	p = kzalloc(size, mask);
	} else {
	p = memblock_alloc(size, SMP_CACHE_BYTES);
	if (!p)
	panic("%s: Failed to allocate %zu bytes\n",
	__func__, size);
	}

	return p;
	}