[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;

#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
EXPORT_SYMBOL(kmap_pte);
pgprot_t kmap_prot;
EXPORT_SYMBOL(kmap_prot);

static inline pte_t *virt_to_kpte(unsigned long vaddr)
{
	return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr),
			vaddr), vaddr);
}

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);

	kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
	kmap_prot = PAGE_KERNEL;
}

static unsigned long highmem_setup(void)
{
	unsigned long pfn;
	unsigned long reservedpages = 0;

	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))
			continue;
		ClearPageReserved(page);
		init_page_count(page);
		__free_page(page);
		totalhigh_pages++;
		reservedpages++;
	}
	totalram_pages += totalhigh_pages;
	printk(KERN_INFO "High memory: %luk\n",
					totalhigh_pages << (PAGE_SHIFT-10));

	return reservedpages;
}
#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];
#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));

#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_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++;
		}
	}

#ifdef CONFIG_HIGHMEM
	reservedpages -= highmem_setup();
#endif

	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);
#ifdef CONFIG_HIGHMEM
	pr_info("  * 0x%08lx..0x%08lx  : highmem PTEs\n",
		PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
#endif /* CONFIG_HIGHMEM */
	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;
#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) {
		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 */
#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);
}

/* 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	51
2f2f371f MS	52	#ifdef CONFIG_HIGHMEM
	53	pte_t *kmap_pte;
	54	EXPORT_SYMBOL(kmap_pte);
	55	pgprot_t kmap_prot;
	56	EXPORT_SYMBOL(kmap_prot);
	57
	58	static inline pte_t *virt_to_kpte(unsigned long vaddr)
	59	{
	60	return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr),
	61	vaddr), vaddr);
	62	}
	63
	64	static void __init highmem_init(void)
	65	{
	66	pr_debug("%x\n", (u32)PKMAP_BASE);
	67	map_page(PKMAP_BASE, 0, 0); /* XXX gross */
	68	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
	69
	70	kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
	71	kmap_prot = PAGE_KERNEL;
	72	}
	73
	74	static unsigned long highmem_setup(void)
	75	{
	76	unsigned long pfn;
	77	unsigned long reservedpages = 0;
	78
	79	for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
	80	struct page *page = pfn_to_page(pfn);
	81
	82	/* FIXME not sure about */
	83	if (memblock_is_reserved(pfn << PAGE_SHIFT))
	84	continue;
	85	ClearPageReserved(page);
	86	init_page_count(page);
	87	__free_page(page);
	88	totalhigh_pages++;
	89	reservedpages++;
	90	}
	91	totalram_pages += totalhigh_pages;
	92	printk(KERN_INFO "High memory: %luk\n",
	93	totalhigh_pages << (PAGE_SHIFT-10));
	94
	95	return reservedpages;
	96	}
	97	#endif /* CONFIG_HIGHMEM */
	98
a95d0e16 MS	99	/*
	100	* paging_init() sets up the page tables - in fact we've already done this.
	101	*/
	102	static void __init paging_init(void)
	103	{
a95d0e16	104	unsigned long zones_size[MAX_NR_ZONES];
41938761 MS	105	#ifdef CONFIG_MMU
	106	int idx;
	107
	108	/* Setup fixmaps */
	109	for (idx = 0; idx < __end_of_fixed_addresses; idx++)
	110	clear_fixmap(idx);
	111	#endif
a95d0e16	112
5af90438 SM	113	/* Clean every zones */
	114	memset(zones_size, 0, sizeof(zones_size));
	115
2f2f371f MS	116	#ifdef CONFIG_HIGHMEM
	117	highmem_init();
	118
	119	zones_size[ZONE_DMA] = max_low_pfn;
	120	zones_size[ZONE_HIGHMEM] = max_pfn;
	121	#else
83a92529	122	zones_size[ZONE_DMA] = max_pfn;
2f2f371f	123	#endif
a95d0e16	124
baab8a82 MS	125	/* We don't have holes in memory map */
baab8a82 MS	126	free_area_init_nodes(zones_size);
a95d0e16 MS	127	}
	128
	129	void __init setup_memory(void)
	130	{
a95d0e16	131	unsigned long map_size;
76bfcc81 BH	132	struct memblock_region *reg;
76bfcc81 BH	133
4dc60832	134	#ifndef CONFIG_MMU
a95d0e16 MS	135	u32 kernel_align_start, kernel_align_size;
	136
	137	/* Find main memory where is the kernel */
76bfcc81 BH	138	for_each_memblock(memory, reg) {
76bfcc81 BH	139	memory_start = (u32)reg->base;
83a92529	140	lowmem_size = reg->size;
a95d0e16	141	if ((memory_start <= (u32)_text) &&
83a92529 MS	142	((u32)_text <= (memory_start + lowmem_size - 1))) {
83a92529 MS	143	memory_size = lowmem_size;
a95d0e16	144	PAGE_OFFSET = memory_start;
83a92529	145	printk(KERN_INFO "%s: Main mem: 0x%x, "
db6e3f91	146	"size 0x%08x\n", __func__, (u32) memory_start,
83a92529	147	(u32) memory_size);
a95d0e16 MS	148	break;
	149	}
	150	}
	151
83a92529 MS	152	if (!memory_start \|\| !memory_size) {
	153	panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
	154	__func__, (u32) memory_start, (u32) memory_size);
a95d0e16 MS	155	}
	156
	157	/* reservation of region where is the kernel */
	158	kernel_align_start = PAGE_DOWN((u32)_text);
	159	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	160	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
83a92529	161	printk(KERN_INFO "%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
a95d0e16 MS	162	__func__, kernel_align_start, kernel_align_start
a95d0e16 MS	163	+ kernel_align_size, kernel_align_size);
83a92529	164	memblock_reserve(kernel_align_start, kernel_align_size);
4dc60832	165	#endif
a95d0e16 MS	166	/*
	167	* Kernel:
	168	* start: base phys address of kernel - page align
	169	* end: base phys address of kernel - page align
	170	*
	171	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	172	* max_low_pfn
	173	* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	174	* num_physpages - number of all pages
	175	*/
	176
	177	/* memory start is from the kernel end (aligned) to higher addr */
	178	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	179	/* RAM is assumed contiguous */
	180	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
83a92529 MS	181	max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
83a92529 MS	182	max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
a95d0e16 MS	183
	184	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	185	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	186	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
83a92529	187	printk(KERN_INFO "%s: max_pfn: %#lx\n", __func__, max_pfn);
a95d0e16 MS	188
	189	/*
	190	* Find an area to use for the bootmem bitmap.
	191	* We look for the first area which is at least
	192	* 128kB in length (128kB is enough for a bitmap
	193	* for 4GB of memory, using 4kB pages), plus 1 page
	194	* (in case the address isn't page-aligned).
	195	*/
e0581667	196	map_size = init_bootmem_node(NODE_DATA(0),
8f37b6c9	197	PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
95f72d1e	198	memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
a95d0e16	199
baab8a82 MS	200	/* Add active regions with valid PFNs */
	201	for_each_memblock(memory, reg) {
	202	unsigned long start_pfn, end_pfn;
	203
	204	start_pfn = memblock_region_memory_base_pfn(reg);
	205	end_pfn = memblock_region_memory_end_pfn(reg);
	206	memblock_set_node(start_pfn << PAGE_SHIFT,
	207	(end_pfn - start_pfn) << PAGE_SHIFT, 0);
	208	}
	209
a95d0e16	210	/* free bootmem is whole main memory */
baab8a82	211	free_bootmem_with_active_regions(0, max_low_pfn);
a95d0e16 MS	212
a95d0e16 MS	213	/* reserve allocate blocks */
76bfcc81	214	for_each_memblock(reserved, reg) {
83a92529 MS	215	unsigned long top = reg->base + reg->size - 1;
	216
	217	pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n",
	218	(u32) reg->base, (u32) reg->size, top,
	219	memory_start + lowmem_size - 1);
	220
	221	if (top <= (memory_start + lowmem_size - 1)) {
	222	reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
	223	} else if (reg->base < (memory_start + lowmem_size - 1)) {
	224	unsigned long trunc_size = memory_start + lowmem_size -
	225	reg->base;
	226	reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
	227	}
a95d0e16	228	}
83a92529	229
baab8a82 MS	230	/* XXX need to clip this if using highmem? */
	231	sparse_memory_present_with_active_regions(0);
	232
4dc60832 MS	233	#ifdef CONFIG_MMU
	234	init_bootmem_done = 1;
	235	#endif
a95d0e16 MS	236	paging_init();
	237	}
	238
	239	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	240	{
	241	unsigned long addr;
	242
	243	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	244	ClearPageReserved(virt_to_page(addr));
	245	init_page_count(virt_to_page(addr));
a95d0e16 MS	246	free_page(addr);
	247	totalram_pages++;
	248	}
	249	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	250	}
	251
	252	#ifdef CONFIG_BLK_DEV_INITRD
	253	void free_initrd_mem(unsigned long start, unsigned long end)
	254	{
	255	int pages = 0;
	256	for (; start < end; start += PAGE_SIZE) {
	257	ClearPageReserved(virt_to_page(start));
	258	init_page_count(virt_to_page(start));
	259	free_page(start);
	260	totalram_pages++;
	261	pages++;
	262	}
d6f61770 LS	263	printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n",
d6f61770 LS	264	(int)(pages * (PAGE_SIZE / 1024)));
a95d0e16 MS	265	}
	266	#endif
	267
	268	void free_initmem(void)
	269	{
	270	free_init_pages("unused kernel memory",
	271	(unsigned long)(&__init_begin),
	272	(unsigned long)(&__init_end));
	273	}
	274
a95d0e16 MS	275	void __init mem_init(void)
a95d0e16 MS	276	{
83299799 MS	277	pg_data_t *pgdat;
	278	unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
	279
83a92529 MS	280	high_memory = (void *)__va(memory_start + lowmem_size - 1);
83a92529 MS	281
a95d0e16 MS	282	/* this will put all memory onto the freelists */
	283	totalram_pages += free_all_bootmem();
	284
83299799 MS	285	for_each_online_pgdat(pgdat) {
	286	unsigned long i;
	287	struct page *page;
	288
	289	for (i = 0; i < pgdat->node_spanned_pages; i++) {
	290	if (!pfn_valid(pgdat->node_start_pfn + i))
	291	continue;
	292	page = pgdat_page_nr(pgdat, i);
	293	if (PageReserved(page))
	294	reservedpages++;
	295	}
	296	}
	297
2f2f371f MS	298	#ifdef CONFIG_HIGHMEM
	299	reservedpages -= highmem_setup();
	300	#endif
	301
83299799 MS	302	codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
	303	datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
	304	initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
	305	bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
	306
	307	pr_info("Memory: %luk/%luk available (%luk kernel code, "
	308	"%luk reserved, %luk data, %luk bss, %luk init)\n",
	309	nr_free_pages() << (PAGE_SHIFT-10),
	310	num_physpages << (PAGE_SHIFT-10),
	311	codesize >> 10,
	312	reservedpages << (PAGE_SHIFT-10),
	313	datasize >> 10,
	314	bsssize >> 10,
	315	initsize >> 10);
	316
	317	#ifdef CONFIG_MMU
	318	pr_info("Kernel virtual memory layout:\n");
	319	pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
2f2f371f MS	320	#ifdef CONFIG_HIGHMEM
	321	pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
	322	PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
	323	#endif /* CONFIG_HIGHMEM */
83299799 MS	324	pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
	325	ioremap_bot, ioremap_base);
	326	pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
	327	(unsigned long)VMALLOC_START, VMALLOC_END);
	328	#endif
4dc60832	329	mem_init_done = 1;
a95d0e16 MS	330	}
a95d0e16 MS	331
4dc60832	332	#ifndef CONFIG_MMU
79bf3a13 MS	333	int page_is_ram(unsigned long pfn)
	334	{
	335	return __range_ok(pfn, 0);
	336	}
4dc60832 MS	337	#else
	338	int page_is_ram(unsigned long pfn)
	339	{
	340	return pfn < max_low_pfn;
	341	}
	342
	343	/*
	344	* Check for command-line options that affect what MMU_init will do.
	345	*/
	346	static void mm_cmdline_setup(void)
	347	{
	348	unsigned long maxmem = 0;
	349	char *p = cmd_line;
	350
	351	/* Look for mem= option on command line */
	352	p = strstr(cmd_line, "mem=");
	353	if (p) {
	354	p += 4;
	355	maxmem = memparse(p, &p);
	356	if (maxmem && memory_size > maxmem) {
	357	memory_size = maxmem;
da5ab11c	358	memblock.memory.regions[0].size = memory_size;
4dc60832 MS	359	}
	360	}
	361	}
	362
	363	/*
	364	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	365	*/
	366	static void __init mmu_init_hw(void)
	367	{
	368	/*
	369	* The Zone Protection Register (ZPR) defines how protection will
	370	* be applied to every page which is a member of a given zone. At
	371	* present, we utilize only two of the zones.
	372	* The zone index bits (of ZSEL) in the PTE are used for software
	373	* indicators, except the LSB. For user access, zone 1 is used,
	374	* for kernel access, zone 0 is used. We set all but zone 1
	375	* to zero, allowing only kernel access as indicated in the PTE.
	376	* For zone 1, we set a 01 binary (a value of 10 will not work)
	377	* to allow user access as indicated in the PTE. This also allows
	378	* kernel access as indicated in the PTE.
	379	*/
	380	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	381	"mts rzpr, r11;"
	382	: : : "r11");
	383	}
	384
	385	/*
	386	* MMU_init sets up the basic memory mappings for the kernel,
	387	* including both RAM and possibly some I/O regions,
	388	* and sets up the page tables and the MMU hardware ready to go.
	389	*/
	390
	391	/* called from head.S */
	392	asmlinkage void __init mmu_init(void)
	393	{
	394	unsigned int kstart, ksize;
	395
95f72d1e	396	if (!memblock.reserved.cnt) {
4dc60832 MS	397	printk(KERN_EMERG "Error memory count\n");
	398	machine_restart(NULL);
	399	}
	400
da5ab11c	401	if ((u32) memblock.memory.regions[0].size < 0x1000000) {
4dc60832 MS	402	printk(KERN_EMERG "Memory must be greater than 16MB\n");
	403	machine_restart(NULL);
	404	}
	405	/* Find main memory where the kernel is */
da5ab11c	406	memory_start = (u32) memblock.memory.regions[0].base;
83a92529 MS	407	lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
	408
	409	if (lowmem_size > CONFIG_LOWMEM_SIZE) {
	410	lowmem_size = CONFIG_LOWMEM_SIZE;
2f2f371f	411	#ifndef CONFIG_HIGHMEM
83a92529	412	memory_size = lowmem_size;
2f2f371f	413	#endif
83a92529	414	}
4dc60832 MS	415
	416	mm_cmdline_setup(); /* FIXME parse args from command line - not used */
	417
	418	/*
	419	* Map out the kernel text/data/bss from the available physical
	420	* memory.
	421	*/
	422	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
	423	/* kernel size */
	424	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
95f72d1e	425	memblock_reserve(kstart, ksize);
4dc60832 MS	426
	427	#if defined(CONFIG_BLK_DEV_INITRD)
	428	/* Remove the init RAM disk from the available memory. */
	429	/* if (initrd_start) {
	430	mem_pieces_remove(&phys_avail, __pa(initrd_start),
	431	initrd_end - initrd_start, 1);
	432	}*/
	433	#endif /* CONFIG_BLK_DEV_INITRD */
	434
	435	/* Initialize the MMU hardware */
	436	mmu_init_hw();
	437
	438	/* Map in all of RAM starting at CONFIG_KERNEL_START */
	439	mapin_ram();
	440
41938761	441	/* Extend vmalloc and ioremap area as big as possible */
2f2f371f MS	442	#ifdef CONFIG_HIGHMEM
	443	ioremap_base = ioremap_bot = PKMAP_BASE;
	444	#else
41938761	445	ioremap_base = ioremap_bot = FIXADDR_START;
2f2f371f	446	#endif
41938761	447
4dc60832 MS	448	/* Initialize the context management stuff */
4dc60832 MS	449	mmu_context_init();
83a92529 MS	450
	451	/* Shortly after that, the entire linear mapping will be available */
	452	/* This will also cause that unflatten device tree will be allocated
	453	* inside 768MB limit */
	454	memblock_set_current_limit(memory_start + lowmem_size - 1);
4dc60832 MS	455	}
	456
	457	/* This is only called until mem_init is done. */
	458	void __init *early_get_page(void)
	459	{
	460	void *p;
	461	if (init_bootmem_done) {
	462	p = alloc_bootmem_pages(PAGE_SIZE);
	463	} else {
	464	/*
	465	* Mem start + 32MB -> here is limit
	466	* because of mem mapping from head.S
	467	*/
95f72d1e	468	p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
4dc60832 MS	469	memory_start + 0x2000000));
	470	}
	471	return p;
	472	}
a84642a3	473
79bf3a13 MS	474	#endif /* CONFIG_MMU */
79bf3a13 MS	475
a84642a3 MS	476	void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
	477	{
	478	if (mem_init_done)
	479	return kmalloc(size, mask);
	480	else
	481	return alloc_bootmem(size);
	482	}
	483
	484	void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
	485	{
	486	void *p;
	487
	488	if (mem_init_done)
	489	p = kzalloc(size, mask);
	490	else {
	491	p = alloc_bootmem(size);
	492	if (p)
	493	memset(p, 0, size);
	494	}
	495	return p;
	496	}