[deliverable/linux.git] / arch / microblaze / mm / init.c

/*
 * 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/bootmem.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/memblock.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;

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

#else
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_size;
EXPORT_SYMBOL(memory_size);
unsigned long lowmem_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];
#ifdef CONFIG_MMU
	int idx;

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

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

	zones_size[ZONE_DMA] = max_pfn;

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

void __init setup_memory(void)
{
	unsigned long map_size;
	struct memblock_region *reg;

#ifndef CONFIG_MMU
	u32 kernel_align_start, kernel_align_size;

	/* Find main memory where is the kernel */
	for_each_memblock(memory, reg) {
		memory_start = (u32)reg->base;
		lowmem_size = reg->size;
		if ((memory_start <= (u32)_text) &&
			((u32)_text <= (memory_start + lowmem_size - 1))) {
			memory_size = lowmem_size;
			PAGE_OFFSET = memory_start;
			printk(KERN_INFO "%s: Main mem: 0x%x, "
				"size 0x%08x\n", __func__, (u32) memory_start,
					(u32) memory_size);
			break;
		}
	}

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

	/* 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;
	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);
	memblock_reserve(kernel_align_start, 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_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
	max_pfn = ((u64)memory_start + (u64)memory_size) >> 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);
	printk(KERN_INFO "%s: max_pfn: %#lx\n", __func__, max_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).
	 */
	map_size = init_bootmem_node(NODE_DATA(0),
		PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
	memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);

	/* Add active regions with valid PFNs */
	for_each_memblock(memory, reg) {
		unsigned long start_pfn, end_pfn;

		start_pfn = memblock_region_memory_base_pfn(reg);
		end_pfn = memblock_region_memory_end_pfn(reg);
		memblock_set_node(start_pfn << PAGE_SHIFT,
					(end_pfn - start_pfn) << PAGE_SHIFT, 0);
	}

	/* free bootmem is whole main memory */
	free_bootmem_with_active_regions(0, max_low_pfn);

	/* reserve allocate blocks */
	for_each_memblock(reserved, reg) {
		unsigned long top = reg->base + reg->size - 1;

		pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n",
			 (u32) reg->base, (u32) reg->size, top,
						memory_start + lowmem_size - 1);

		if (top <= (memory_start + lowmem_size - 1)) {
			reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
		} else if (reg->base < (memory_start + lowmem_size - 1)) {
			unsigned long trunc_size = memory_start + lowmem_size -
								reg->base;
			reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
		}
	}

	/* XXX need to clip this if using highmem? */
	sparse_memory_present_with_active_regions(0);

#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));
		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));
}

void __init mem_init(void)
{
	pg_data_t *pgdat;
	unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;

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

	/* this will put all memory onto the freelists */
	totalram_pages += free_all_bootmem();

	for_each_online_pgdat(pgdat) {
		unsigned long i;
		struct page *page;

		for (i = 0; i < pgdat->node_spanned_pages; i++) {
			if (!pfn_valid(pgdat->node_start_pfn + i))
				continue;
			page = pgdat_page_nr(pgdat, i);
			if (PageReserved(page))
				reservedpages++;
		}
	}

	codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
	datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
	initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
	bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;

	pr_info("Memory: %luk/%luk available (%luk kernel code, "
		"%luk reserved, %luk data, %luk bss, %luk init)\n",
		nr_free_pages() << (PAGE_SHIFT-10),
		num_physpages << (PAGE_SHIFT-10),
		codesize >> 10,
		reservedpages << (PAGE_SHIFT-10),
		datasize >> 10,
		bsssize >> 10,
		initsize >> 10);

#ifdef CONFIG_MMU
	pr_info("Kernel virtual memory layout:\n");
	pr_info("  * 0x%08lx..0x%08lx  : fixmap\n", FIXADDR_START, FIXADDR_TOP);
	pr_info("  * 0x%08lx..0x%08lx  : early ioremap\n",
		ioremap_bot, ioremap_base);
	pr_info("  * 0x%08lx..0x%08lx  : vmalloc & ioremap\n",
		(unsigned long)VMALLOC_START, VMALLOC_END);
#endif
	mem_init_done = 1;
}

#ifndef CONFIG_MMU
int page_is_ram(unsigned long pfn)
{
	return __range_ok(pfn, 0);
}
#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;
			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) {
		printk(KERN_EMERG "Error memory count\n");
		machine_restart(NULL);
	}

	if ((u32) memblock.memory.regions[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) 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;
		memory_size = lowmem_size;
	}

	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) {
		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();

	/* Extend vmalloc and ioremap area as big as possible */
	ioremap_base = ioremap_bot = FIXADDR_START;

	/* 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);
}

/* 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(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
					memory_start + 0x2000000));
	}
	return p;
}

#endif /* CONFIG_MMU */

void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
{
	if (mem_init_done)
		return kmalloc(size, mask);
	else
		return alloc_bootmem(size);
}

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

	if (mem_init_done)
		p = kzalloc(size, mask);
	else {
		p = alloc_bootmem(size);
		if (p)
			memset(p, 0, size);
	}
	return p;
}
Commit	Line	Data
a95d0e16 MS	1	/*
	2	* Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
	3	* Copyright (C) 2006 Atmark Techno, Inc.
	4	*
	5	* This file is subject to the terms and conditions of the GNU General Public
	6	* License. See the file "COPYING" in the main directory of this archive
	7	* for more details.
	8	*/
	9
	10	#include <linux/bootmem.h>
	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
95f72d1e	13	#include <linux/memblock.h>
a95d0e16 MS	14	#include <linux/mm.h> /* mem_init */
	15	#include <linux/initrd.h>
	16	#include <linux/pagemap.h>
	17	#include <linux/pfn.h>
5a0e3ad6	18	#include <linux/slab.h>
a95d0e16	19	#include <linux/swap.h>
66421a64	20	#include <linux/export.h>
a95d0e16 MS	21
	22	#include <asm/page.h>
	23	#include <asm/mmu_context.h>
	24	#include <asm/pgalloc.h>
	25	#include <asm/sections.h>
	26	#include <asm/tlb.h>
41938761	27	#include <asm/fixmap.h>
a95d0e16	28
79bf3a13 MS	29	/* Use for MMU and noMMU because of PCI generic code */
	30	int mem_init_done;
	31
4dc60832	32	#ifndef CONFIG_MMU
a95d0e16	33	unsigned int __page_offset;
5af7fa68	34	EXPORT_SYMBOL(__page_offset);
a95d0e16	35
4dc60832	36	#else
4dc60832 MS	37	static int init_bootmem_done;
	38	#endif /* CONFIG_MMU */
	39
a95d0e16 MS	40	char *klimit = _end;
	41
	42	/*
	43	* Initialize the bootmem system and give it all the memory we
	44	* have available.
	45	*/
4dc60832	46	unsigned long memory_start;
fd6ed51f	47	EXPORT_SYMBOL(memory_start);
4dc60832	48	unsigned long memory_size;
ee4bcdf1	49	EXPORT_SYMBOL(memory_size);
83a92529	50	unsigned long lowmem_size;
a95d0e16 MS	51
	52	/*
	53	* paging_init() sets up the page tables - in fact we've already done this.
	54	*/
	55	static void __init paging_init(void)
	56	{
a95d0e16	57	unsigned long zones_size[MAX_NR_ZONES];
41938761 MS	58	#ifdef CONFIG_MMU
	59	int idx;
	60
	61	/* Setup fixmaps */
	62	for (idx = 0; idx < __end_of_fixed_addresses; idx++)
	63	clear_fixmap(idx);
	64	#endif
a95d0e16	65
5af90438 SM	66	/* Clean every zones */
	67	memset(zones_size, 0, sizeof(zones_size));
	68
83a92529	69	zones_size[ZONE_DMA] = max_pfn;
a95d0e16	70
baab8a82 MS	71	/* We don't have holes in memory map */
baab8a82 MS	72	free_area_init_nodes(zones_size);
a95d0e16 MS	73	}
	74
	75	void __init setup_memory(void)
	76	{
a95d0e16	77	unsigned long map_size;
76bfcc81 BH	78	struct memblock_region *reg;
76bfcc81 BH	79
4dc60832	80	#ifndef CONFIG_MMU
a95d0e16 MS	81	u32 kernel_align_start, kernel_align_size;
	82
	83	/* Find main memory where is the kernel */
76bfcc81 BH	84	for_each_memblock(memory, reg) {
76bfcc81 BH	85	memory_start = (u32)reg->base;
83a92529	86	lowmem_size = reg->size;
a95d0e16	87	if ((memory_start <= (u32)_text) &&
83a92529 MS	88	((u32)_text <= (memory_start + lowmem_size - 1))) {
83a92529 MS	89	memory_size = lowmem_size;
a95d0e16	90	PAGE_OFFSET = memory_start;
83a92529	91	printk(KERN_INFO "%s: Main mem: 0x%x, "
db6e3f91	92	"size 0x%08x\n", __func__, (u32) memory_start,
83a92529	93	(u32) memory_size);
a95d0e16 MS	94	break;
	95	}
	96	}
	97
83a92529 MS	98	if (!memory_start \|\| !memory_size) {
	99	panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
	100	__func__, (u32) memory_start, (u32) memory_size);
a95d0e16 MS	101	}
	102
	103	/* reservation of region where is the kernel */
	104	kernel_align_start = PAGE_DOWN((u32)_text);
	105	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	106	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
83a92529	107	printk(KERN_INFO "%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
a95d0e16 MS	108	__func__, kernel_align_start, kernel_align_start
a95d0e16 MS	109	+ kernel_align_size, kernel_align_size);
83a92529	110	memblock_reserve(kernel_align_start, kernel_align_size);
4dc60832	111	#endif
a95d0e16 MS	112	/*
	113	* Kernel:
	114	* start: base phys address of kernel - page align
	115	* end: base phys address of kernel - page align
	116	*
	117	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	118	* max_low_pfn
	119	* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	120	* num_physpages - number of all pages
	121	*/
	122
	123	/* memory start is from the kernel end (aligned) to higher addr */
	124	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	125	/* RAM is assumed contiguous */
	126	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
83a92529 MS	127	max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
83a92529 MS	128	max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
a95d0e16 MS	129
	130	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	131	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	132	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
83a92529	133	printk(KERN_INFO "%s: max_pfn: %#lx\n", __func__, max_pfn);
a95d0e16 MS	134
	135	/*
	136	* Find an area to use for the bootmem bitmap.
	137	* We look for the first area which is at least
	138	* 128kB in length (128kB is enough for a bitmap
	139	* for 4GB of memory, using 4kB pages), plus 1 page
	140	* (in case the address isn't page-aligned).
	141	*/
e0581667	142	map_size = init_bootmem_node(NODE_DATA(0),
8f37b6c9	143	PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
95f72d1e	144	memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
a95d0e16	145
baab8a82 MS	146	/* Add active regions with valid PFNs */
	147	for_each_memblock(memory, reg) {
	148	unsigned long start_pfn, end_pfn;
	149
	150	start_pfn = memblock_region_memory_base_pfn(reg);
	151	end_pfn = memblock_region_memory_end_pfn(reg);
	152	memblock_set_node(start_pfn << PAGE_SHIFT,
	153	(end_pfn - start_pfn) << PAGE_SHIFT, 0);
	154	}
	155
a95d0e16	156	/* free bootmem is whole main memory */
baab8a82	157	free_bootmem_with_active_regions(0, max_low_pfn);
a95d0e16 MS	158
a95d0e16 MS	159	/* reserve allocate blocks */
76bfcc81	160	for_each_memblock(reserved, reg) {
83a92529 MS	161	unsigned long top = reg->base + reg->size - 1;
	162
	163	pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n",
	164	(u32) reg->base, (u32) reg->size, top,
	165	memory_start + lowmem_size - 1);
	166
	167	if (top <= (memory_start + lowmem_size - 1)) {
	168	reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
	169	} else if (reg->base < (memory_start + lowmem_size - 1)) {
	170	unsigned long trunc_size = memory_start + lowmem_size -
	171	reg->base;
	172	reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
	173	}
a95d0e16	174	}
83a92529	175
baab8a82 MS	176	/* XXX need to clip this if using highmem? */
	177	sparse_memory_present_with_active_regions(0);
	178
4dc60832 MS	179	#ifdef CONFIG_MMU
	180	init_bootmem_done = 1;
	181	#endif
a95d0e16 MS	182	paging_init();
	183	}
	184
	185	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	186	{
	187	unsigned long addr;
	188
	189	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	190	ClearPageReserved(virt_to_page(addr));
	191	init_page_count(virt_to_page(addr));
a95d0e16 MS	192	free_page(addr);
	193	totalram_pages++;
	194	}
	195	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	196	}
	197
	198	#ifdef CONFIG_BLK_DEV_INITRD
	199	void free_initrd_mem(unsigned long start, unsigned long end)
	200	{
	201	int pages = 0;
	202	for (; start < end; start += PAGE_SIZE) {
	203	ClearPageReserved(virt_to_page(start));
	204	init_page_count(virt_to_page(start));
	205	free_page(start);
	206	totalram_pages++;
	207	pages++;
	208	}
d6f61770 LS	209	printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n",
d6f61770 LS	210	(int)(pages * (PAGE_SIZE / 1024)));
a95d0e16 MS	211	}
	212	#endif
	213
	214	void free_initmem(void)
	215	{
	216	free_init_pages("unused kernel memory",
	217	(unsigned long)(&__init_begin),
	218	(unsigned long)(&__init_end));
	219	}
	220
a95d0e16 MS	221	void __init mem_init(void)
a95d0e16 MS	222	{
83299799 MS	223	pg_data_t *pgdat;
	224	unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
	225
83a92529 MS	226	high_memory = (void *)__va(memory_start + lowmem_size - 1);
83a92529 MS	227
a95d0e16 MS	228	/* this will put all memory onto the freelists */
	229	totalram_pages += free_all_bootmem();
	230
83299799 MS	231	for_each_online_pgdat(pgdat) {
	232	unsigned long i;
	233	struct page *page;
	234
	235	for (i = 0; i < pgdat->node_spanned_pages; i++) {
	236	if (!pfn_valid(pgdat->node_start_pfn + i))
	237	continue;
	238	page = pgdat_page_nr(pgdat, i);
	239	if (PageReserved(page))
	240	reservedpages++;
	241	}
	242	}
	243
	244	codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
	245	datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
	246	initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
	247	bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
	248
	249	pr_info("Memory: %luk/%luk available (%luk kernel code, "
	250	"%luk reserved, %luk data, %luk bss, %luk init)\n",
	251	nr_free_pages() << (PAGE_SHIFT-10),
	252	num_physpages << (PAGE_SHIFT-10),
	253	codesize >> 10,
	254	reservedpages << (PAGE_SHIFT-10),
	255	datasize >> 10,
	256	bsssize >> 10,
	257	initsize >> 10);
	258
	259	#ifdef CONFIG_MMU
	260	pr_info("Kernel virtual memory layout:\n");
	261	pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
	262	pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
	263	ioremap_bot, ioremap_base);
	264	pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
	265	(unsigned long)VMALLOC_START, VMALLOC_END);
	266	#endif
4dc60832	267	mem_init_done = 1;
a95d0e16 MS	268	}
a95d0e16 MS	269
4dc60832	270	#ifndef CONFIG_MMU
79bf3a13 MS	271	int page_is_ram(unsigned long pfn)
	272	{
	273	return __range_ok(pfn, 0);
	274	}
4dc60832 MS	275	#else
	276	int page_is_ram(unsigned long pfn)
	277	{
	278	return pfn < max_low_pfn;
	279	}
	280
	281	/*
	282	* Check for command-line options that affect what MMU_init will do.
	283	*/
	284	static void mm_cmdline_setup(void)
	285	{
	286	unsigned long maxmem = 0;
	287	char *p = cmd_line;
	288
	289	/* Look for mem= option on command line */
	290	p = strstr(cmd_line, "mem=");
	291	if (p) {
	292	p += 4;
	293	maxmem = memparse(p, &p);
	294	if (maxmem && memory_size > maxmem) {
	295	memory_size = maxmem;
da5ab11c	296	memblock.memory.regions[0].size = memory_size;
4dc60832 MS	297	}
	298	}
	299	}
	300
	301	/*
	302	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	303	*/
	304	static void __init mmu_init_hw(void)
	305	{
	306	/*
	307	* The Zone Protection Register (ZPR) defines how protection will
	308	* be applied to every page which is a member of a given zone. At
	309	* present, we utilize only two of the zones.
	310	* The zone index bits (of ZSEL) in the PTE are used for software
	311	* indicators, except the LSB. For user access, zone 1 is used,
	312	* for kernel access, zone 0 is used. We set all but zone 1
	313	* to zero, allowing only kernel access as indicated in the PTE.
	314	* For zone 1, we set a 01 binary (a value of 10 will not work)
	315	* to allow user access as indicated in the PTE. This also allows
	316	* kernel access as indicated in the PTE.
	317	*/
	318	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	319	"mts rzpr, r11;"
	320	: : : "r11");
	321	}
	322
	323	/*
	324	* MMU_init sets up the basic memory mappings for the kernel,
	325	* including both RAM and possibly some I/O regions,
	326	* and sets up the page tables and the MMU hardware ready to go.
	327	*/
	328
	329	/* called from head.S */
	330	asmlinkage void __init mmu_init(void)
	331	{
	332	unsigned int kstart, ksize;
	333
95f72d1e	334	if (!memblock.reserved.cnt) {
4dc60832 MS	335	printk(KERN_EMERG "Error memory count\n");
	336	machine_restart(NULL);
	337	}
	338
da5ab11c	339	if ((u32) memblock.memory.regions[0].size < 0x1000000) {
4dc60832 MS	340	printk(KERN_EMERG "Memory must be greater than 16MB\n");
	341	machine_restart(NULL);
	342	}
	343	/* Find main memory where the kernel is */
da5ab11c	344	memory_start = (u32) memblock.memory.regions[0].base;
83a92529 MS	345	lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
	346
	347	if (lowmem_size > CONFIG_LOWMEM_SIZE) {
	348	lowmem_size = CONFIG_LOWMEM_SIZE;
	349	memory_size = lowmem_size;
	350	}
4dc60832 MS	351
	352	mm_cmdline_setup(); /* FIXME parse args from command line - not used */
	353
	354	/*
	355	* Map out the kernel text/data/bss from the available physical
	356	* memory.
	357	*/
	358	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
	359	/* kernel size */
	360	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
95f72d1e	361	memblock_reserve(kstart, ksize);
4dc60832 MS	362
	363	#if defined(CONFIG_BLK_DEV_INITRD)
	364	/* Remove the init RAM disk from the available memory. */
	365	/* if (initrd_start) {
	366	mem_pieces_remove(&phys_avail, __pa(initrd_start),
	367	initrd_end - initrd_start, 1);
	368	}*/
	369	#endif /* CONFIG_BLK_DEV_INITRD */
	370
	371	/* Initialize the MMU hardware */
	372	mmu_init_hw();
	373
	374	/* Map in all of RAM starting at CONFIG_KERNEL_START */
	375	mapin_ram();
	376
41938761 MS	377	/* Extend vmalloc and ioremap area as big as possible */
	378	ioremap_base = ioremap_bot = FIXADDR_START;
	379
4dc60832 MS	380	/* Initialize the context management stuff */
4dc60832 MS	381	mmu_context_init();
83a92529 MS	382
	383	/* Shortly after that, the entire linear mapping will be available */
	384	/* This will also cause that unflatten device tree will be allocated
	385	* inside 768MB limit */
	386	memblock_set_current_limit(memory_start + lowmem_size - 1);
4dc60832 MS	387	}
	388
	389	/* This is only called until mem_init is done. */
	390	void __init *early_get_page(void)
	391	{
	392	void *p;
	393	if (init_bootmem_done) {
	394	p = alloc_bootmem_pages(PAGE_SIZE);
	395	} else {
	396	/*
	397	* Mem start + 32MB -> here is limit
	398	* because of mem mapping from head.S
	399	*/
95f72d1e	400	p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
4dc60832 MS	401	memory_start + 0x2000000));
	402	}
	403	return p;
	404	}
a84642a3	405
79bf3a13 MS	406	#endif /* CONFIG_MMU */
79bf3a13 MS	407
a84642a3 MS	408	void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
	409	{
	410	if (mem_init_done)
	411	return kmalloc(size, mask);
	412	else
	413	return alloc_bootmem(size);
	414	}
	415
	416	void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
	417	{
	418	void *p;
	419
	420	if (mem_init_done)
	421	p = kzalloc(size, mask);
	422	else {
	423	p = alloc_bootmem(size);
	424	if (p)
	425	memset(p, 0, size);
	426	}
	427	return p;
	428	}