[GitHub/mt8127/android_kernel_alcatel_ttab.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 <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;
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));

	/*
	 * 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)
{
	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 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(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 MS	19	#include <linux/swap.h>
	20
	21	#include <asm/page.h>
	22	#include <asm/mmu_context.h>
	23	#include <asm/pgalloc.h>
	24	#include <asm/sections.h>
	25	#include <asm/tlb.h>
	26
79bf3a13 MS	27	/* Use for MMU and noMMU because of PCI generic code */
	28	int mem_init_done;
	29
4dc60832	30	#ifndef CONFIG_MMU
a95d0e16	31	unsigned int __page_offset;
5af7fa68	32	EXPORT_SYMBOL(__page_offset);
a95d0e16	33
4dc60832 MS	34	#else
	35	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	36
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 MS	48	unsigned long memory_end; /* due to mm/nommu.c */
4dc60832 MS	49	unsigned long memory_size;
ee4bcdf1	50	EXPORT_SYMBOL(memory_size);
a95d0e16 MS	51
	52	/*
	53	* paging_init() sets up the page tables - in fact we've already done this.
	54	*/
	55	static void __init paging_init(void)
	56	{
a95d0e16 MS	57	unsigned long zones_size[MAX_NR_ZONES];
a95d0e16 MS	58
5af90438 SM	59	/* Clean every zones */
	60	memset(zones_size, 0, sizeof(zones_size));
	61
a95d0e16 MS	62	/*
	63	* old: we can DMA to/from any address.put all page into ZONE_DMA
	64	* We use only ZONE_NORMAL
	65	*/
	66	zones_size[ZONE_NORMAL] = max_mapnr;
	67
a95d0e16 MS	68	free_area_init(zones_size);
	69	}
	70
	71	void __init setup_memory(void)
	72	{
a95d0e16	73	unsigned long map_size;
76bfcc81 BH	74	struct memblock_region *reg;
76bfcc81 BH	75
4dc60832	76	#ifndef CONFIG_MMU
a95d0e16 MS	77	u32 kernel_align_start, kernel_align_size;
	78
	79	/* Find main memory where is the kernel */
76bfcc81 BH	80	for_each_memblock(memory, reg) {
	81	memory_start = (u32)reg->base;
	82	memory_end = (u32) reg->base + reg->size;
a95d0e16 MS	83	if ((memory_start <= (u32)_text) &&
	84	((u32)_text <= memory_end)) {
	85	memory_size = memory_end - memory_start;
	86	PAGE_OFFSET = memory_start;
	87	printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
db6e3f91 MS	88	"size 0x%08x\n", __func__, (u32) memory_start,
db6e3f91 MS	89	(u32) memory_end, (u32) memory_size);
a95d0e16 MS	90	break;
	91	}
	92	}
	93
	94	if (!memory_start \|\| !memory_end) {
	95	panic("%s: Missing memory setting 0x%08x-0x%08x\n",
db6e3f91	96	__func__, (u32) memory_start, (u32) memory_end);
a95d0e16 MS	97	}
	98
	99	/* reservation of region where is the kernel */
	100	kernel_align_start = PAGE_DOWN((u32)_text);
	101	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
	102	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
95f72d1e	103	memblock_reserve(kernel_align_start, kernel_align_size);
a95d0e16 MS	104	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
	105	__func__, kernel_align_start, kernel_align_start
	106	+ kernel_align_size, kernel_align_size);
	107
4dc60832	108	#endif
a95d0e16 MS	109	/*
	110	* Kernel:
	111	* start: base phys address of kernel - page align
	112	* end: base phys address of kernel - page align
	113	*
	114	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	115	* max_low_pfn
	116	* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
	117	* num_physpages - number of all pages
	118	*/
	119
	120	/* memory start is from the kernel end (aligned) to higher addr */
	121	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	122	/* RAM is assumed contiguous */
	123	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
	124	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
	125
	126	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
	127	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	128	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
	129
	130	/*
	131	* Find an area to use for the bootmem bitmap.
	132	* We look for the first area which is at least
	133	* 128kB in length (128kB is enough for a bitmap
	134	* for 4GB of memory, using 4kB pages), plus 1 page
	135	* (in case the address isn't page-aligned).
	136	*/
e0581667	137	map_size = init_bootmem_node(NODE_DATA(0),
8f37b6c9	138	PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
95f72d1e	139	memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
a95d0e16 MS	140
	141	/* free bootmem is whole main memory */
	142	free_bootmem(memory_start, memory_size);
	143
	144	/* reserve allocate blocks */
76bfcc81 BH	145	for_each_memblock(reserved, reg) {
	146	pr_debug("reserved - 0x%08x-0x%08x\n",
	147	(u32) reg->base, (u32) reg->size);
	148	reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
a95d0e16	149	}
4dc60832 MS	150	#ifdef CONFIG_MMU
	151	init_bootmem_done = 1;
	152	#endif
a95d0e16 MS	153	paging_init();
	154	}
	155
	156	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	157	{
	158	unsigned long addr;
	159
	160	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	161	ClearPageReserved(virt_to_page(addr));
	162	init_page_count(virt_to_page(addr));
a95d0e16 MS	163	free_page(addr);
	164	totalram_pages++;
	165	}
	166	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	167	}
	168
	169	#ifdef CONFIG_BLK_DEV_INITRD
	170	void free_initrd_mem(unsigned long start, unsigned long end)
	171	{
	172	int pages = 0;
	173	for (; start < end; start += PAGE_SIZE) {
	174	ClearPageReserved(virt_to_page(start));
	175	init_page_count(virt_to_page(start));
	176	free_page(start);
	177	totalram_pages++;
	178	pages++;
	179	}
d6f61770 LS	180	printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n",
d6f61770 LS	181	(int)(pages * (PAGE_SIZE / 1024)));
a95d0e16 MS	182	}
	183	#endif
	184
	185	void free_initmem(void)
	186	{
	187	free_init_pages("unused kernel memory",
	188	(unsigned long)(&__init_begin),
	189	(unsigned long)(&__init_end));
	190	}
	191
a95d0e16 MS	192	void __init mem_init(void)
	193	{
	194	high_memory = (void *)__va(memory_end);
	195	/* this will put all memory onto the freelists */
	196	totalram_pages += free_all_bootmem();
	197
	198	printk(KERN_INFO "Memory: %luk/%luk available\n",
cc013a88	199	nr_free_pages() << (PAGE_SHIFT-10),
a95d0e16	200	num_physpages << (PAGE_SHIFT-10));
4dc60832	201	mem_init_done = 1;
a95d0e16 MS	202	}
a95d0e16 MS	203
4dc60832	204	#ifndef CONFIG_MMU
79bf3a13 MS	205	int page_is_ram(unsigned long pfn)
	206	{
	207	return __range_ok(pfn, 0);
	208	}
4dc60832 MS	209	#else
	210	int page_is_ram(unsigned long pfn)
	211	{
	212	return pfn < max_low_pfn;
	213	}
	214
	215	/*
	216	* Check for command-line options that affect what MMU_init will do.
	217	*/
	218	static void mm_cmdline_setup(void)
	219	{
	220	unsigned long maxmem = 0;
	221	char *p = cmd_line;
	222
	223	/* Look for mem= option on command line */
	224	p = strstr(cmd_line, "mem=");
	225	if (p) {
	226	p += 4;
	227	maxmem = memparse(p, &p);
	228	if (maxmem && memory_size > maxmem) {
	229	memory_size = maxmem;
	230	memory_end = memory_start + memory_size;
da5ab11c	231	memblock.memory.regions[0].size = memory_size;
4dc60832 MS	232	}
	233	}
	234	}
	235
	236	/*
	237	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	238	*/
	239	static void __init mmu_init_hw(void)
	240	{
	241	/*
	242	* The Zone Protection Register (ZPR) defines how protection will
	243	* be applied to every page which is a member of a given zone. At
	244	* present, we utilize only two of the zones.
	245	* The zone index bits (of ZSEL) in the PTE are used for software
	246	* indicators, except the LSB. For user access, zone 1 is used,
	247	* for kernel access, zone 0 is used. We set all but zone 1
	248	* to zero, allowing only kernel access as indicated in the PTE.
	249	* For zone 1, we set a 01 binary (a value of 10 will not work)
	250	* to allow user access as indicated in the PTE. This also allows
	251	* kernel access as indicated in the PTE.
	252	*/
	253	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	254	"mts rzpr, r11;"
	255	: : : "r11");
	256	}
	257
	258	/*
	259	* MMU_init sets up the basic memory mappings for the kernel,
	260	* including both RAM and possibly some I/O regions,
	261	* and sets up the page tables and the MMU hardware ready to go.
	262	*/
	263
	264	/* called from head.S */
	265	asmlinkage void __init mmu_init(void)
	266	{
	267	unsigned int kstart, ksize;
	268
95f72d1e	269	if (!memblock.reserved.cnt) {
4dc60832 MS	270	printk(KERN_EMERG "Error memory count\n");
	271	machine_restart(NULL);
	272	}
	273
da5ab11c	274	if ((u32) memblock.memory.regions[0].size < 0x1000000) {
4dc60832 MS	275	printk(KERN_EMERG "Memory must be greater than 16MB\n");
	276	machine_restart(NULL);
	277	}
	278	/* Find main memory where the kernel is */
da5ab11c MS	279	memory_start = (u32) memblock.memory.regions[0].base;
	280	memory_end = (u32) memblock.memory.regions[0].base +
	281	(u32) memblock.memory.regions[0].size;
4dc60832 MS	282	memory_size = memory_end - memory_start;
	283
	284	mm_cmdline_setup(); /* FIXME parse args from command line - not used */
	285
	286	/*
	287	* Map out the kernel text/data/bss from the available physical
	288	* memory.
	289	*/
	290	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
	291	/* kernel size */
	292	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
95f72d1e	293	memblock_reserve(kstart, ksize);
4dc60832 MS	294
	295	#if defined(CONFIG_BLK_DEV_INITRD)
	296	/* Remove the init RAM disk from the available memory. */
	297	/* if (initrd_start) {
	298	mem_pieces_remove(&phys_avail, __pa(initrd_start),
	299	initrd_end - initrd_start, 1);
	300	}*/
	301	#endif /* CONFIG_BLK_DEV_INITRD */
	302
	303	/* Initialize the MMU hardware */
	304	mmu_init_hw();
	305
	306	/* Map in all of RAM starting at CONFIG_KERNEL_START */
	307	mapin_ram();
	308
	309	#ifdef HIGHMEM_START_BOOL
	310	ioremap_base = HIGHMEM_START;
	311	#else
	312	ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
	313	#endif /* CONFIG_HIGHMEM */
	314	ioremap_bot = ioremap_base;
	315
	316	/* Initialize the context management stuff */
	317	mmu_context_init();
	318	}
	319
	320	/* This is only called until mem_init is done. */
	321	void __init *early_get_page(void)
	322	{
	323	void *p;
	324	if (init_bootmem_done) {
	325	p = alloc_bootmem_pages(PAGE_SIZE);
	326	} else {
	327	/*
	328	* Mem start + 32MB -> here is limit
	329	* because of mem mapping from head.S
	330	*/
95f72d1e	331	p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
4dc60832 MS	332	memory_start + 0x2000000));
	333	}
	334	return p;
	335	}
a84642a3	336
79bf3a13 MS	337	#endif /* CONFIG_MMU */
79bf3a13 MS	338
a84642a3 MS	339	void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
	340	{
	341	if (mem_init_done)
	342	return kmalloc(size, mask);
	343	else
	344	return alloc_bootmem(size);
	345	}
	346
	347	void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
	348	{
	349	void *p;
	350
	351	if (mem_init_done)
	352	p = kzalloc(size, mask);
	353	else {
	354	p = alloc_bootmem(size);
	355	if (p)
	356	memset(p, 0, size);
	357	}
	358	return p;
	359	}