[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>

/* 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_end; /* due to mm/nommu.c */
unsigned long memory_size;
EXPORT_SYMBOL(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));

	zones_size[ZONE_DMA] = max_mapnr;

	free_area_init(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;
		memory_end = (u32) reg->base + reg->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;
	memblock_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).
	 */
	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);

	/* free bootmem is whole main memory */
	free_bootmem(memory_start, memory_size);

	/* reserve allocate blocks */
	for_each_memblock(reserved, reg) {
		pr_debug("reserved - 0x%08x-0x%08x\n",
			 (u32) reg->base, (u32) reg->size);
		reserve_bootmem(reg->base, reg->size, 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));
		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
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;
			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;
	memory_end = (u32) memblock.memory.regions[0].base +
				(u32) memblock.memory.regions[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));
	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();

#ifdef CONFIG_HIGHMEM_START_BOOL
	ioremap_base = CONFIG_HIGHMEM_START;
#else
	ioremap_base = 0xfe000000UL;	/* for now, could be 0xfffff000 */
#endif /* CONFIG_HIGHMEM_START_BOOL */
	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(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>
	27
79bf3a13 MS	28	/* Use for MMU and noMMU because of PCI generic code */
	29	int mem_init_done;
	30
4dc60832	31	#ifndef CONFIG_MMU
a95d0e16	32	unsigned int __page_offset;
5af7fa68	33	EXPORT_SYMBOL(__page_offset);
a95d0e16	34
4dc60832	35	#else
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;
ee4bcdf1	49	EXPORT_SYMBOL(memory_size);
a95d0e16 MS	50
	51	/*
	52	* paging_init() sets up the page tables - in fact we've already done this.
	53	*/
	54	static void __init paging_init(void)
	55	{
a95d0e16 MS	56	unsigned long zones_size[MAX_NR_ZONES];
a95d0e16 MS	57
5af90438 SM	58	/* Clean every zones */
	59	memset(zones_size, 0, sizeof(zones_size));
	60
4e2e4124	61	zones_size[ZONE_DMA] = max_mapnr;
a95d0e16	62
a95d0e16 MS	63	free_area_init(zones_size);
	64	}
	65
	66	void __init setup_memory(void)
	67	{
a95d0e16	68	unsigned long map_size;
76bfcc81 BH	69	struct memblock_region *reg;
76bfcc81 BH	70
4dc60832	71	#ifndef CONFIG_MMU
a95d0e16 MS	72	u32 kernel_align_start, kernel_align_size;
	73
	74	/* Find main memory where is the kernel */
76bfcc81 BH	75	for_each_memblock(memory, reg) {
	76	memory_start = (u32)reg->base;
	77	memory_end = (u32) reg->base + reg->size;
a95d0e16 MS	78	if ((memory_start <= (u32)_text) &&
	79	((u32)_text <= memory_end)) {
	80	memory_size = memory_end - memory_start;
	81	PAGE_OFFSET = memory_start;
	82	printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
db6e3f91 MS	83	"size 0x%08x\n", __func__, (u32) memory_start,
db6e3f91 MS	84	(u32) memory_end, (u32) memory_size);
a95d0e16 MS	85	break;
	86	}
	87	}
	88
	89	if (!memory_start \|\| !memory_end) {
	90	panic("%s: Missing memory setting 0x%08x-0x%08x\n",
db6e3f91	91	__func__, (u32) memory_start, (u32) memory_end);
a95d0e16 MS	92	}
	93
	94	/* reservation of region where is the kernel */
	95	kernel_align_start = PAGE_DOWN((u32)_text);
	96	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	97	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
95f72d1e	98	memblock_reserve(kernel_align_start, kernel_align_size);
a95d0e16 MS	99	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
	100	__func__, kernel_align_start, kernel_align_start
	101	+ kernel_align_size, kernel_align_size);
	102
4dc60832	103	#endif
a95d0e16 MS	104	/*
	105	* Kernel:
	106	* start: base phys address of kernel - page align
	107	* end: base phys address of kernel - page align
	108	*
	109	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	110	* max_low_pfn
	111	* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	112	* num_physpages - number of all pages
	113	*/
	114
	115	/* memory start is from the kernel end (aligned) to higher addr */
	116	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	117	/* RAM is assumed contiguous */
	118	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
	119	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
	120
	121	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	122	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	123	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
	124
	125	/*
	126	* Find an area to use for the bootmem bitmap.
	127	* We look for the first area which is at least
	128	* 128kB in length (128kB is enough for a bitmap
	129	* for 4GB of memory, using 4kB pages), plus 1 page
	130	* (in case the address isn't page-aligned).
	131	*/
e0581667	132	map_size = init_bootmem_node(NODE_DATA(0),
8f37b6c9	133	PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
95f72d1e	134	memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
a95d0e16 MS	135
	136	/* free bootmem is whole main memory */
	137	free_bootmem(memory_start, memory_size);
	138
	139	/* reserve allocate blocks */
76bfcc81 BH	140	for_each_memblock(reserved, reg) {
	141	pr_debug("reserved - 0x%08x-0x%08x\n",
	142	(u32) reg->base, (u32) reg->size);
	143	reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
a95d0e16	144	}
4dc60832 MS	145	#ifdef CONFIG_MMU
	146	init_bootmem_done = 1;
	147	#endif
a95d0e16 MS	148	paging_init();
	149	}
	150
	151	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	152	{
	153	unsigned long addr;
	154
	155	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	156	ClearPageReserved(virt_to_page(addr));
	157	init_page_count(virt_to_page(addr));
a95d0e16 MS	158	free_page(addr);
	159	totalram_pages++;
	160	}
	161	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	162	}
	163
	164	#ifdef CONFIG_BLK_DEV_INITRD
	165	void free_initrd_mem(unsigned long start, unsigned long end)
	166	{
	167	int pages = 0;
	168	for (; start < end; start += PAGE_SIZE) {
	169	ClearPageReserved(virt_to_page(start));
	170	init_page_count(virt_to_page(start));
	171	free_page(start);
	172	totalram_pages++;
	173	pages++;
	174	}
d6f61770 LS	175	printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n",
d6f61770 LS	176	(int)(pages * (PAGE_SIZE / 1024)));
a95d0e16 MS	177	}
	178	#endif
	179
	180	void free_initmem(void)
	181	{
	182	free_init_pages("unused kernel memory",
	183	(unsigned long)(&__init_begin),
	184	(unsigned long)(&__init_end));
	185	}
	186
a95d0e16 MS	187	void __init mem_init(void)
	188	{
	189	high_memory = (void *)__va(memory_end);
	190	/* this will put all memory onto the freelists */
	191	totalram_pages += free_all_bootmem();
	192
	193	printk(KERN_INFO "Memory: %luk/%luk available\n",
cc013a88	194	nr_free_pages() << (PAGE_SHIFT-10),
a95d0e16	195	num_physpages << (PAGE_SHIFT-10));
4dc60832	196	mem_init_done = 1;
a95d0e16 MS	197	}
a95d0e16 MS	198
4dc60832	199	#ifndef CONFIG_MMU
79bf3a13 MS	200	int page_is_ram(unsigned long pfn)
	201	{
	202	return __range_ok(pfn, 0);
	203	}
4dc60832 MS	204	#else
	205	int page_is_ram(unsigned long pfn)
	206	{
	207	return pfn < max_low_pfn;
	208	}
	209
	210	/*
	211	* Check for command-line options that affect what MMU_init will do.
	212	*/
	213	static void mm_cmdline_setup(void)
	214	{
	215	unsigned long maxmem = 0;
	216	char *p = cmd_line;
	217
	218	/* Look for mem= option on command line */
	219	p = strstr(cmd_line, "mem=");
	220	if (p) {
	221	p += 4;
	222	maxmem = memparse(p, &p);
	223	if (maxmem && memory_size > maxmem) {
	224	memory_size = maxmem;
	225	memory_end = memory_start + memory_size;
da5ab11c	226	memblock.memory.regions[0].size = memory_size;
4dc60832 MS	227	}
	228	}
	229	}
	230
	231	/*
	232	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	233	*/
	234	static void __init mmu_init_hw(void)
	235	{
	236	/*
	237	* The Zone Protection Register (ZPR) defines how protection will
	238	* be applied to every page which is a member of a given zone. At
	239	* present, we utilize only two of the zones.
	240	* The zone index bits (of ZSEL) in the PTE are used for software
	241	* indicators, except the LSB. For user access, zone 1 is used,
	242	* for kernel access, zone 0 is used. We set all but zone 1
	243	* to zero, allowing only kernel access as indicated in the PTE.
	244	* For zone 1, we set a 01 binary (a value of 10 will not work)
	245	* to allow user access as indicated in the PTE. This also allows
	246	* kernel access as indicated in the PTE.
	247	*/
	248	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	249	"mts rzpr, r11;"
	250	: : : "r11");
	251	}
	252
	253	/*
	254	* MMU_init sets up the basic memory mappings for the kernel,
	255	* including both RAM and possibly some I/O regions,
	256	* and sets up the page tables and the MMU hardware ready to go.
	257	*/
	258
	259	/* called from head.S */
	260	asmlinkage void __init mmu_init(void)
	261	{
	262	unsigned int kstart, ksize;
	263
95f72d1e	264	if (!memblock.reserved.cnt) {
4dc60832 MS	265	printk(KERN_EMERG "Error memory count\n");
	266	machine_restart(NULL);
	267	}
	268
da5ab11c	269	if ((u32) memblock.memory.regions[0].size < 0x1000000) {
4dc60832 MS	270	printk(KERN_EMERG "Memory must be greater than 16MB\n");
	271	machine_restart(NULL);
	272	}
	273	/* Find main memory where the kernel is */
da5ab11c MS	274	memory_start = (u32) memblock.memory.regions[0].base;
	275	memory_end = (u32) memblock.memory.regions[0].base +
	276	(u32) memblock.memory.regions[0].size;
4dc60832 MS	277	memory_size = memory_end - memory_start;
	278
	279	mm_cmdline_setup(); /* FIXME parse args from command line - not used */
	280
	281	/*
	282	* Map out the kernel text/data/bss from the available physical
	283	* memory.
	284	*/
	285	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
	286	/* kernel size */
	287	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
95f72d1e	288	memblock_reserve(kstart, ksize);
4dc60832 MS	289
	290	#if defined(CONFIG_BLK_DEV_INITRD)
	291	/* Remove the init RAM disk from the available memory. */
	292	/* if (initrd_start) {
	293	mem_pieces_remove(&phys_avail, __pa(initrd_start),
	294	initrd_end - initrd_start, 1);
	295	}*/
	296	#endif /* CONFIG_BLK_DEV_INITRD */
	297
	298	/* Initialize the MMU hardware */
	299	mmu_init_hw();
	300
	301	/* Map in all of RAM starting at CONFIG_KERNEL_START */
	302	mapin_ram();
	303
6be9dd12 PB	304	#ifdef CONFIG_HIGHMEM_START_BOOL
6be9dd12 PB	305	ioremap_base = CONFIG_HIGHMEM_START;
4dc60832 MS	306	#else
4dc60832 MS	307	ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
6be9dd12	308	#endif /* CONFIG_HIGHMEM_START_BOOL */
4dc60832 MS	309	ioremap_bot = ioremap_base;
	310
	311	/* Initialize the context management stuff */
	312	mmu_context_init();
	313	}
	314
	315	/* This is only called until mem_init is done. */
	316	void __init *early_get_page(void)
	317	{
	318	void *p;
	319	if (init_bootmem_done) {
	320	p = alloc_bootmem_pages(PAGE_SIZE);
	321	} else {
	322	/*
	323	* Mem start + 32MB -> here is limit
	324	* because of mem mapping from head.S
	325	*/
95f72d1e	326	p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
4dc60832 MS	327	memory_start + 0x2000000));
	328	}
	329	return p;
	330	}
a84642a3	331
79bf3a13 MS	332	#endif /* CONFIG_MMU */
79bf3a13 MS	333
a84642a3 MS	334	void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
	335	{
	336	if (mem_init_done)
	337	return kmalloc(size, mask);
	338	else
	339	return alloc_bootmem(size);
	340	}
	341
	342	void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
	343	{
	344	void *p;
	345
	346	if (mem_init_done)
	347	p = kzalloc(size, mask);
	348	else {
	349	p = alloc_bootmem(size);
	350	if (p)
	351	memset(p, 0, size);
	352	}
	353	return p;
	354	}