[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/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 */
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>
	13	#include <linux/lmb.h>
	14	#include <linux/mm.h> /* mem_init */
	15	#include <linux/initrd.h>
	16	#include <linux/pagemap.h>
	17	#include <linux/pfn.h>
	18	#include <linux/swap.h>
	19
	20	#include <asm/page.h>
	21	#include <asm/mmu_context.h>
	22	#include <asm/pgalloc.h>
	23	#include <asm/sections.h>
	24	#include <asm/tlb.h>
	25
4dc60832	26	#ifndef CONFIG_MMU
a95d0e16	27	unsigned int __page_offset;
5af7fa68	28	EXPORT_SYMBOL(__page_offset);
a95d0e16	29
4dc60832 MS	30	#else
	31	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	32
	33	int mem_init_done;
	34	static int init_bootmem_done;
	35	#endif /* CONFIG_MMU */
	36
a95d0e16 MS	37	char *klimit = _end;
	38
	39	/*
	40	* Initialize the bootmem system and give it all the memory we
	41	* have available.
	42	*/
4dc60832	43	unsigned long memory_start;
fd6ed51f	44	EXPORT_SYMBOL(memory_start);
4dc60832 MS	45	unsigned long memory_end; /* due to mm/nommu.c */
4dc60832 MS	46	unsigned long memory_size;
a95d0e16 MS	47
	48	/*
	49	* paging_init() sets up the page tables - in fact we've already done this.
	50	*/
	51	static void __init paging_init(void)
	52	{
a95d0e16 MS	53	unsigned long zones_size[MAX_NR_ZONES];
a95d0e16 MS	54
5af90438 SM	55	/* Clean every zones */
	56	memset(zones_size, 0, sizeof(zones_size));
	57
a95d0e16 MS	58	/*
	59	* old: we can DMA to/from any address.put all page into ZONE_DMA
	60	* We use only ZONE_NORMAL
	61	*/
	62	zones_size[ZONE_NORMAL] = max_mapnr;
	63
a95d0e16 MS	64	free_area_init(zones_size);
	65	}
	66
	67	void __init setup_memory(void)
	68	{
	69	int i;
	70	unsigned long map_size;
4dc60832	71	#ifndef CONFIG_MMU
a95d0e16 MS	72	u32 kernel_align_start, kernel_align_size;
	73
	74	/* Find main memory where is the kernel */
	75	for (i = 0; i < lmb.memory.cnt; i++) {
	76	memory_start = (u32) lmb.memory.region[i].base;
	77	memory_end = (u32) lmb.memory.region[i].base
	78	+ (u32) lmb.memory.region[i].size;
	79	if ((memory_start <= (u32)_text) &&
	80	((u32)_text <= memory_end)) {
	81	memory_size = memory_end - memory_start;
	82	PAGE_OFFSET = memory_start;
	83	printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
db6e3f91 MS	84	"size 0x%08x\n", __func__, (u32) memory_start,
db6e3f91 MS	85	(u32) memory_end, (u32) memory_size);
a95d0e16 MS	86	break;
	87	}
	88	}
	89
	90	if (!memory_start \|\| !memory_end) {
	91	panic("%s: Missing memory setting 0x%08x-0x%08x\n",
db6e3f91	92	__func__, (u32) memory_start, (u32) memory_end);
a95d0e16 MS	93	}
	94
	95	/* reservation of region where is the kernel */
	96	kernel_align_start = PAGE_DOWN((u32)_text);
	97	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	98	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
	99	lmb_reserve(kernel_align_start, kernel_align_size);
	100	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
	101	__func__, kernel_align_start, kernel_align_start
	102	+ kernel_align_size, kernel_align_size);
	103
4dc60832	104	#endif
a95d0e16 MS	105	/*
	106	* Kernel:
	107	* start: base phys address of kernel - page align
	108	* end: base phys address of kernel - page align
	109	*
	110	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	111	* max_low_pfn
	112	* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	113	* num_physpages - number of all pages
	114	*/
	115
	116	/* memory start is from the kernel end (aligned) to higher addr */
	117	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	118	/* RAM is assumed contiguous */
	119	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
	120	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
	121
	122	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	123	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	124	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
	125
	126	/*
	127	* Find an area to use for the bootmem bitmap.
	128	* We look for the first area which is at least
	129	* 128kB in length (128kB is enough for a bitmap
	130	* for 4GB of memory, using 4kB pages), plus 1 page
	131	* (in case the address isn't page-aligned).
	132	*/
4dc60832	133	#ifndef CONFIG_MMU
8f37b6c9	134	map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)),
a95d0e16	135	min_low_pfn, max_low_pfn);
4dc60832 MS	136	#else
4dc60832 MS	137	map_size = init_bootmem_node(&contig_page_data,
8f37b6c9	138	PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
4dc60832	139	#endif
8f37b6c9	140	lmb_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
a95d0e16 MS	141
	142	/* free bootmem is whole main memory */
	143	free_bootmem(memory_start, memory_size);
	144
	145	/* reserve allocate blocks */
	146	for (i = 0; i < lmb.reserved.cnt; i++) {
	147	pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
	148	(u32) lmb.reserved.region[i].base,
	149	(u32) lmb_size_bytes(&lmb.reserved, i));
	150	reserve_bootmem(lmb.reserved.region[i].base,
	151	lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
	152	}
4dc60832 MS	153	#ifdef CONFIG_MMU
	154	init_bootmem_done = 1;
	155	#endif
a95d0e16 MS	156	paging_init();
	157	}
	158
	159	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	160	{
	161	unsigned long addr;
	162
	163	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	164	ClearPageReserved(virt_to_page(addr));
	165	init_page_count(virt_to_page(addr));
	166	memset((void *)addr, 0xcc, PAGE_SIZE);
	167	free_page(addr);
	168	totalram_pages++;
	169	}
	170	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	171	}
	172
	173	#ifdef CONFIG_BLK_DEV_INITRD
	174	void free_initrd_mem(unsigned long start, unsigned long end)
	175	{
	176	int pages = 0;
	177	for (; start < end; start += PAGE_SIZE) {
	178	ClearPageReserved(virt_to_page(start));
	179	init_page_count(virt_to_page(start));
	180	free_page(start);
	181	totalram_pages++;
	182	pages++;
	183	}
d6f61770 LS	184	printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n",
d6f61770 LS	185	(int)(pages * (PAGE_SIZE / 1024)));
a95d0e16 MS	186	}
	187	#endif
	188
	189	void free_initmem(void)
	190	{
	191	free_init_pages("unused kernel memory",
	192	(unsigned long)(&__init_begin),
	193	(unsigned long)(&__init_end));
	194	}
	195
	196	/* FIXME from arch/powerpc/mm/mem.c*/
	197	void show_mem(void)
	198	{
	199	printk(KERN_NOTICE "%s\n", __func__);
	200	}
	201
	202	void __init mem_init(void)
	203	{
	204	high_memory = (void *)__va(memory_end);
	205	/* this will put all memory onto the freelists */
	206	totalram_pages += free_all_bootmem();
	207
	208	printk(KERN_INFO "Memory: %luk/%luk available\n",
cc013a88	209	nr_free_pages() << (PAGE_SHIFT-10),
a95d0e16	210	num_physpages << (PAGE_SHIFT-10));
4dc60832 MS	211	#ifdef CONFIG_MMU
	212	mem_init_done = 1;
	213	#endif
a95d0e16 MS	214	}
a95d0e16 MS	215
4dc60832	216	#ifndef CONFIG_MMU
a95d0e16 MS	217	/* Check against bounds of physical memory */
	218	int ___range_ok(unsigned long addr, unsigned long size)
	219	{
	220	return ((addr < memory_start) \|\|
	221	((addr + size) > memory_end));
	222	}
5af7fa68	223	EXPORT_SYMBOL(___range_ok);
4dc60832 MS	224
	225	#else
	226	int page_is_ram(unsigned long pfn)
	227	{
	228	return pfn < max_low_pfn;
	229	}
	230
	231	/*
	232	* Check for command-line options that affect what MMU_init will do.
	233	*/
	234	static void mm_cmdline_setup(void)
	235	{
	236	unsigned long maxmem = 0;
	237	char *p = cmd_line;
	238
	239	/* Look for mem= option on command line */
	240	p = strstr(cmd_line, "mem=");
	241	if (p) {
	242	p += 4;
	243	maxmem = memparse(p, &p);
	244	if (maxmem && memory_size > maxmem) {
	245	memory_size = maxmem;
	246	memory_end = memory_start + memory_size;
	247	lmb.memory.region[0].size = memory_size;
	248	}
	249	}
	250	}
	251
	252	/*
	253	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	254	*/
	255	static void __init mmu_init_hw(void)
	256	{
	257	/*
	258	* The Zone Protection Register (ZPR) defines how protection will
	259	* be applied to every page which is a member of a given zone. At
	260	* present, we utilize only two of the zones.
	261	* The zone index bits (of ZSEL) in the PTE are used for software
	262	* indicators, except the LSB. For user access, zone 1 is used,
	263	* for kernel access, zone 0 is used. We set all but zone 1
	264	* to zero, allowing only kernel access as indicated in the PTE.
	265	* For zone 1, we set a 01 binary (a value of 10 will not work)
	266	* to allow user access as indicated in the PTE. This also allows
	267	* kernel access as indicated in the PTE.
	268	*/
	269	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	270	"mts rzpr, r11;"
	271	: : : "r11");
	272	}
	273
	274	/*
	275	* MMU_init sets up the basic memory mappings for the kernel,
	276	* including both RAM and possibly some I/O regions,
	277	* and sets up the page tables and the MMU hardware ready to go.
	278	*/
	279
	280	/* called from head.S */
	281	asmlinkage void __init mmu_init(void)
	282	{
	283	unsigned int kstart, ksize;
	284
	285	if (!lmb.reserved.cnt) {
	286	printk(KERN_EMERG "Error memory count\n");
	287	machine_restart(NULL);
288	}
289
290	if ((u32) lmb.memory.region[0].size < 0x1000000) {
291	printk(KERN_EMERG "Memory must be greater than 16MB\n");
292	machine_restart(NULL);
293	}
294	/* Find main memory where the kernel is */
295	memory_start = (u32) lmb.memory.region[0].base;
296	memory_end = (u32) lmb.memory.region[0].base +
297	(u32) lmb.memory.region[0].size;
298	memory_size = memory_end - memory_start;
299
300	mm_cmdline_setup(); /* FIXME parse args from command line - not used */
301
302	/*
303	* Map out the kernel text/data/bss from the available physical
304	* memory.
305	*/
306	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
307	/* kernel size */
308	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
309	lmb_reserve(kstart, ksize);
310
311	#if defined(CONFIG_BLK_DEV_INITRD)
312	/* Remove the init RAM disk from the available memory. */
313	/* if (initrd_start) {
314	mem_pieces_remove(&phys_avail, __pa(initrd_start),
315	initrd_end - initrd_start, 1);
316	}*/
317	#endif /* CONFIG_BLK_DEV_INITRD */
318
319	/* Initialize the MMU hardware */
320	mmu_init_hw();
321
322	/* Map in all of RAM starting at CONFIG_KERNEL_START */
323	mapin_ram();
324
325	#ifdef HIGHMEM_START_BOOL
326	ioremap_base = HIGHMEM_START;
327	#else
328	ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
329	#endif /* CONFIG_HIGHMEM */
330	ioremap_bot = ioremap_base;
331
332	/* Initialize the context management stuff */
333	mmu_context_init();
334	}
335
336	/* This is only called until mem_init is done. */
337	void __init *early_get_page(void)
338	{
339	void *p;
340	if (init_bootmem_done) {
341	p = alloc_bootmem_pages(PAGE_SIZE);
342	} else {
343	/*
344	* Mem start + 32MB -> here is limit
345	* because of mem mapping from head.S
346	*/
347	p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
348	memory_start + 0x2000000));
349	}
350	return p;
351	}
352	#endif /* CONFIG_MMU */