[linux-2.6-block.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>

/* 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
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

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));
}

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));
	mem_init_done = 1;
}

#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);

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;
			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 */

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>
	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
79bf3a13 MS	26	/* Use for MMU and noMMU because of PCI generic code */
	27	int mem_init_done;
	28
4dc60832	29	#ifndef CONFIG_MMU
a95d0e16	30	unsigned int __page_offset;
5af7fa68	31	EXPORT_SYMBOL(__page_offset);
a95d0e16	32
4dc60832 MS	33	#else
	34	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	35
4dc60832 MS	36	static int init_bootmem_done;
	37	#endif /* CONFIG_MMU */
	38
a95d0e16 MS	39	char *klimit = _end;
	40
	41	/*
	42	* Initialize the bootmem system and give it all the memory we
	43	* have available.
	44	*/
4dc60832	45	unsigned long memory_start;
fd6ed51f	46	EXPORT_SYMBOL(memory_start);
4dc60832 MS	47	unsigned long memory_end; /* due to mm/nommu.c */
4dc60832 MS	48	unsigned long memory_size;
a95d0e16 MS	49
	50	/*
	51	* paging_init() sets up the page tables - in fact we've already done this.
	52	*/
	53	static void __init paging_init(void)
	54	{
a95d0e16 MS	55	unsigned long zones_size[MAX_NR_ZONES];
a95d0e16 MS	56
5af90438 SM	57	/* Clean every zones */
	58	memset(zones_size, 0, sizeof(zones_size));
	59
a95d0e16 MS	60	/*
	61	* old: we can DMA to/from any address.put all page into ZONE_DMA
	62	* We use only ZONE_NORMAL
	63	*/
	64	zones_size[ZONE_NORMAL] = max_mapnr;
	65
a95d0e16 MS	66	free_area_init(zones_size);
	67	}
	68
	69	void __init setup_memory(void)
	70	{
	71	int i;
	72	unsigned long map_size;
4dc60832	73	#ifndef CONFIG_MMU
a95d0e16 MS	74	u32 kernel_align_start, kernel_align_size;
	75
	76	/* Find main memory where is the kernel */
	77	for (i = 0; i < lmb.memory.cnt; i++) {
	78	memory_start = (u32) lmb.memory.region[i].base;
	79	memory_end = (u32) lmb.memory.region[i].base
	80	+ (u32) lmb.memory.region[i].size;
	81	if ((memory_start <= (u32)_text) &&
	82	((u32)_text <= memory_end)) {
	83	memory_size = memory_end - memory_start;
	84	PAGE_OFFSET = memory_start;
	85	printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
db6e3f91 MS	86	"size 0x%08x\n", __func__, (u32) memory_start,
db6e3f91 MS	87	(u32) memory_end, (u32) memory_size);
a95d0e16 MS	88	break;
	89	}
	90	}
	91
	92	if (!memory_start \|\| !memory_end) {
	93	panic("%s: Missing memory setting 0x%08x-0x%08x\n",
db6e3f91	94	__func__, (u32) memory_start, (u32) memory_end);
a95d0e16 MS	95	}
	96
	97	/* reservation of region where is the kernel */
	98	kernel_align_start = PAGE_DOWN((u32)_text);
	99	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	100	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
	101	lmb_reserve(kernel_align_start, kernel_align_size);
	102	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
	103	__func__, kernel_align_start, kernel_align_start
	104	+ kernel_align_size, kernel_align_size);
	105
4dc60832	106	#endif
a95d0e16 MS	107	/*
	108	* Kernel:
	109	* start: base phys address of kernel - page align
	110	* end: base phys address of kernel - page align
	111	*
	112	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	113	* max_low_pfn
	114	* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	115	* num_physpages - number of all pages
	116	*/
	117
	118	/* memory start is from the kernel end (aligned) to higher addr */
	119	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	120	/* RAM is assumed contiguous */
	121	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
	122	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
	123
	124	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	125	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	126	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
	127
	128	/*
	129	* Find an area to use for the bootmem bitmap.
	130	* We look for the first area which is at least
	131	* 128kB in length (128kB is enough for a bitmap
	132	* for 4GB of memory, using 4kB pages), plus 1 page
	133	* (in case the address isn't page-aligned).
	134	*/
4dc60832	135	#ifndef CONFIG_MMU
8f37b6c9	136	map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)),
a95d0e16	137	min_low_pfn, max_low_pfn);
4dc60832 MS	138	#else
4dc60832 MS	139	map_size = init_bootmem_node(&contig_page_data,
8f37b6c9	140	PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
4dc60832	141	#endif
8f37b6c9	142	lmb_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
a95d0e16 MS	143
	144	/* free bootmem is whole main memory */
	145	free_bootmem(memory_start, memory_size);
	146
	147	/* reserve allocate blocks */
	148	for (i = 0; i < lmb.reserved.cnt; i++) {
	149	pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
	150	(u32) lmb.reserved.region[i].base,
	151	(u32) lmb_size_bytes(&lmb.reserved, i));
	152	reserve_bootmem(lmb.reserved.region[i].base,
	153	lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
	154	}
4dc60832 MS	155	#ifdef CONFIG_MMU
	156	init_bootmem_done = 1;
	157	#endif
a95d0e16 MS	158	paging_init();
	159	}
	160
	161	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	162	{
	163	unsigned long addr;
	164
	165	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	166	ClearPageReserved(virt_to_page(addr));
	167	init_page_count(virt_to_page(addr));
	168	memset((void *)addr, 0xcc, PAGE_SIZE);
	169	free_page(addr);
	170	totalram_pages++;
	171	}
	172	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	173	}
	174
	175	#ifdef CONFIG_BLK_DEV_INITRD
	176	void free_initrd_mem(unsigned long start, unsigned long end)
	177	{
	178	int pages = 0;
	179	for (; start < end; start += PAGE_SIZE) {
	180	ClearPageReserved(virt_to_page(start));
	181	init_page_count(virt_to_page(start));
	182	free_page(start);
	183	totalram_pages++;
	184	pages++;
	185	}
d6f61770 LS	186	printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n",
d6f61770 LS	187	(int)(pages * (PAGE_SIZE / 1024)));
a95d0e16 MS	188	}
	189	#endif
	190
	191	void free_initmem(void)
	192	{
	193	free_init_pages("unused kernel memory",
	194	(unsigned long)(&__init_begin),
	195	(unsigned long)(&__init_end));
	196	}
	197
a95d0e16 MS	198	void __init mem_init(void)
	199	{
	200	high_memory = (void *)__va(memory_end);
	201	/* this will put all memory onto the freelists */
	202	totalram_pages += free_all_bootmem();
	203
	204	printk(KERN_INFO "Memory: %luk/%luk available\n",
cc013a88	205	nr_free_pages() << (PAGE_SHIFT-10),
a95d0e16	206	num_physpages << (PAGE_SHIFT-10));
4dc60832	207	mem_init_done = 1;
a95d0e16 MS	208	}
a95d0e16 MS	209
4dc60832	210	#ifndef CONFIG_MMU
a95d0e16 MS	211	/* Check against bounds of physical memory */
	212	int ___range_ok(unsigned long addr, unsigned long size)
	213	{
	214	return ((addr < memory_start) \|\|
	215	((addr + size) > memory_end));
	216	}
5af7fa68	217	EXPORT_SYMBOL(___range_ok);
4dc60832	218
79bf3a13 MS	219	int page_is_ram(unsigned long pfn)
	220	{
	221	return __range_ok(pfn, 0);
	222	}
4dc60832 MS	223	#else
	224	int page_is_ram(unsigned long pfn)
	225	{
	226	return pfn < max_low_pfn;
	227	}
	228
	229	/*
	230	* Check for command-line options that affect what MMU_init will do.
	231	*/
	232	static void mm_cmdline_setup(void)
	233	{
	234	unsigned long maxmem = 0;
	235	char *p = cmd_line;
	236
	237	/* Look for mem= option on command line */
	238	p = strstr(cmd_line, "mem=");
	239	if (p) {
	240	p += 4;
	241	maxmem = memparse(p, &p);
	242	if (maxmem && memory_size > maxmem) {
	243	memory_size = maxmem;
	244	memory_end = memory_start + memory_size;
	245	lmb.memory.region[0].size = memory_size;
	246	}
	247	}
	248	}
	249
	250	/*
	251	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	252	*/
	253	static void __init mmu_init_hw(void)
	254	{
	255	/*
	256	* The Zone Protection Register (ZPR) defines how protection will
	257	* be applied to every page which is a member of a given zone. At
	258	* present, we utilize only two of the zones.
	259	* The zone index bits (of ZSEL) in the PTE are used for software
	260	* indicators, except the LSB. For user access, zone 1 is used,
	261	* for kernel access, zone 0 is used. We set all but zone 1
	262	* to zero, allowing only kernel access as indicated in the PTE.
	263	* For zone 1, we set a 01 binary (a value of 10 will not work)
	264	* to allow user access as indicated in the PTE. This also allows
	265	* kernel access as indicated in the PTE.
	266	*/
	267	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	268	"mts rzpr, r11;"
	269	: : : "r11");
	270	}
	271
	272	/*
	273	* MMU_init sets up the basic memory mappings for the kernel,
	274	* including both RAM and possibly some I/O regions,
	275	* and sets up the page tables and the MMU hardware ready to go.
	276	*/
	277
	278	/* called from head.S */
	279	asmlinkage void __init mmu_init(void)
	280	{
	281	unsigned int kstart, ksize;
	282
	283	if (!lmb.reserved.cnt) {
	284	printk(KERN_EMERG "Error memory count\n");
	285	machine_restart(NULL);
	286	}
287
288	if ((u32) lmb.memory.region[0].size < 0x1000000) {
289	printk(KERN_EMERG "Memory must be greater than 16MB\n");
290	machine_restart(NULL);
291	}
292	/* Find main memory where the kernel is */
293	memory_start = (u32) lmb.memory.region[0].base;
294	memory_end = (u32) lmb.memory.region[0].base +
295	(u32) lmb.memory.region[0].size;
296	memory_size = memory_end - memory_start;
297
298	mm_cmdline_setup(); /* FIXME parse args from command line - not used */
299
300	/*
301	* Map out the kernel text/data/bss from the available physical
302	* memory.
303	*/
304	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
305	/* kernel size */
306	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
307	lmb_reserve(kstart, ksize);
308
309	#if defined(CONFIG_BLK_DEV_INITRD)
310	/* Remove the init RAM disk from the available memory. */
311	/* if (initrd_start) {
312	mem_pieces_remove(&phys_avail, __pa(initrd_start),
313	initrd_end - initrd_start, 1);
314	}*/
315	#endif /* CONFIG_BLK_DEV_INITRD */
316
317	/* Initialize the MMU hardware */
318	mmu_init_hw();
319
320	/* Map in all of RAM starting at CONFIG_KERNEL_START */
321	mapin_ram();
322
323	#ifdef HIGHMEM_START_BOOL
324	ioremap_base = HIGHMEM_START;
325	#else
326	ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
327	#endif /* CONFIG_HIGHMEM */
328	ioremap_bot = ioremap_base;
329
330	/* Initialize the context management stuff */
331	mmu_context_init();
332	}
333
334	/* This is only called until mem_init is done. */
335	void __init *early_get_page(void)
336	{
337	void *p;
338	if (init_bootmem_done) {
339	p = alloc_bootmem_pages(PAGE_SIZE);
340	} else {
341	/*
342	* Mem start + 32MB -> here is limit
343	* because of mem mapping from head.S
344	*/
345	p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
346	memory_start + 0x2000000));
347	}
348	return p;
349	}
a84642a3	350
79bf3a13 MS	351	#endif /* CONFIG_MMU */
79bf3a13 MS	352
a84642a3 MS	353	void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
	354	{
	355	if (mem_init_done)
	356	return kmalloc(size, mask);
	357	else
	358	return alloc_bootmem(size);
	359	}
	360
	361	void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
	362	{
	363	void *p;
	364
	365	if (mem_init_done)
	366	p = kzalloc(size, mask);
	367	else {
	368	p = alloc_bootmem(size);
	369	if (p)
	370	memset(p, 0, size);
	371	}
	372	return p;
	373	}