[deliverable/linux.git] / arch / powerpc / mm / init_32.c

/*
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
 *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
 *    Copyright (C) 1996 Paul Mackerras
 *  PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
 *
 *  Derived from "arch/i386/mm/init.c"
 *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>
#include <linux/initrd.h>
#include <linux/pagemap.h>
#include <linux/lmb.h>

#include <asm/pgalloc.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/btext.h>
#include <asm/tlb.h>
#include <asm/sections.h>

#include "mmu_decl.h"

#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
/* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */
#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
#endif
#endif
#define MAX_LOW_MEM	CONFIG_LOWMEM_SIZE

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

unsigned long total_memory;
unsigned long total_lowmem;

phys_addr_t memstart_addr = (phys_addr_t)~0ull;
EXPORT_SYMBOL(memstart_addr);
phys_addr_t kernstart_addr;
EXPORT_SYMBOL(kernstart_addr);
phys_addr_t lowmem_end_addr;

int boot_mapsize;
#ifdef CONFIG_PPC_PMAC
unsigned long agp_special_page;
EXPORT_SYMBOL(agp_special_page);
#endif

#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;

EXPORT_SYMBOL(kmap_prot);
EXPORT_SYMBOL(kmap_pte);
#endif

void MMU_init(void);

/* XXX should be in current.h  -- paulus */
extern struct task_struct *current_set[NR_CPUS];

extern int init_bootmem_done;

/*
 * this tells the system to map all of ram with the segregs
 * (i.e. page tables) instead of the bats.
 * -- Cort
 */
int __map_without_bats;
int __map_without_ltlbs;

/* max amount of low RAM to map in */
unsigned long __max_low_memory = MAX_LOW_MEM;

/*
 * address of the limit of what is accessible with initial MMU setup -
 * 256MB usually, but only 16MB on 601.
 */
phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000;

/*
 * Check for command-line options that affect what MMU_init will do.
 */
void MMU_setup(void)
{
	/* Check for nobats option (used in mapin_ram). */
	if (strstr(cmd_line, "nobats")) {
		__map_without_bats = 1;
	}

	if (strstr(cmd_line, "noltlbs")) {
		__map_without_ltlbs = 1;
	}
#ifdef CONFIG_DEBUG_PAGEALLOC
	__map_without_bats = 1;
	__map_without_ltlbs = 1;
#endif
}

/*
 * 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.
 */
void __init MMU_init(void)
{
	if (ppc_md.progress)
		ppc_md.progress("MMU:enter", 0x111);

	/* 601 can only access 16MB at the moment */
	if (PVR_VER(mfspr(SPRN_PVR)) == 1)
		__initial_memory_limit_addr = 0x01000000;
	/* 8xx can only access 8MB at the moment */
	if (PVR_VER(mfspr(SPRN_PVR)) == 0x50)
		__initial_memory_limit_addr = 0x00800000;

	/* parse args from command line */
	MMU_setup();

	if (lmb.memory.cnt > 1) {
		lmb.memory.cnt = 1;
		lmb_analyze();
		printk(KERN_WARNING "Only using first contiguous memory region");
	}

	total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr;
	lowmem_end_addr = memstart_addr + total_lowmem;

#ifdef CONFIG_FSL_BOOKE
	/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
	 * entries, so we need to adjust lowmem to match the amount we can map
	 * in the fixed entries */
	adjust_total_lowmem();
#endif /* CONFIG_FSL_BOOKE */

	if (total_lowmem > __max_low_memory) {
		total_lowmem = __max_low_memory;
		lowmem_end_addr = memstart_addr + total_lowmem;
#ifndef CONFIG_HIGHMEM
		total_memory = total_lowmem;
		lmb_enforce_memory_limit(lowmem_end_addr);
		lmb_analyze();
#endif /* CONFIG_HIGHMEM */
	}

	/* Initialize the MMU hardware */
	if (ppc_md.progress)
		ppc_md.progress("MMU:hw init", 0x300);
	MMU_init_hw();

	/* Map in all of RAM starting at KERNELBASE */
	if (ppc_md.progress)
		ppc_md.progress("MMU:mapin", 0x301);
	mapin_ram();

#ifdef CONFIG_HIGHMEM
	ioremap_base = PKMAP_BASE;
#else
	ioremap_base = 0xfe000000UL;	/* for now, could be 0xfffff000 */
#endif /* CONFIG_HIGHMEM */
	ioremap_bot = ioremap_base;

	/* Map in I/O resources */
	if (ppc_md.progress)
		ppc_md.progress("MMU:setio", 0x302);

	/* Initialize the context management stuff */
	mmu_context_init();

	if (ppc_md.progress)
		ppc_md.progress("MMU:exit", 0x211);

	/* From now on, btext is no longer BAT mapped if it was at all */
#ifdef CONFIG_BOOTX_TEXT
	btext_unmap();
#endif
}

/* 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 {
		p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
					__initial_memory_limit_addr));
	}
	return p;
}

/* Free up now-unused memory */
static void free_sec(unsigned long start, unsigned long end, const char *name)
{
	unsigned long cnt = 0;

	while (start < end) {
		ClearPageReserved(virt_to_page(start));
		init_page_count(virt_to_page(start));
		free_page(start);
		cnt++;
		start += PAGE_SIZE;
 	}
	if (cnt) {
		printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name);
		totalram_pages += cnt;
	}
}

void free_initmem(void)
{
#define FREESEC(TYPE) \
	free_sec((unsigned long)(&__ ## TYPE ## _begin), \
		 (unsigned long)(&__ ## TYPE ## _end), \
		 #TYPE);

	printk ("Freeing unused kernel memory:");
	FREESEC(init);
 	printk("\n");
	ppc_md.progress = NULL;
#undef FREESEC
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (start < end)
		printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
	for (; start < end; start += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(start));
		init_page_count(virt_to_page(start));
		free_page(start);
		totalram_pages++;
	}
}
#endif

#ifdef CONFIG_PROC_KCORE
static struct kcore_list kcore_vmem;

static int __init setup_kcore(void)
{
	int i;

	for (i = 0; i < lmb.memory.cnt; i++) {
		unsigned long base;
		unsigned long size;
		struct kcore_list *kcore_mem;

		base = lmb.memory.region[i].base;
		size = lmb.memory.region[i].size;

		kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
		if (!kcore_mem)
			panic("%s: kmalloc failed\n", __func__);

		/* must stay under 32 bits */
		if ( 0xfffffffful - (unsigned long)__va(base) < size) {
			size = 0xfffffffful - (unsigned long)(__va(base));
			printk(KERN_DEBUG "setup_kcore: restrict size=%lx\n",
						size);
		}

		kclist_add(kcore_mem, __va(base), size);
	}

	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
		VMALLOC_END-VMALLOC_START);

	return 0;
}
module_init(setup_kcore);
#endif
Commit	Line	Data
14cf11af PM	1	/*
	2	* PowerPC version
	3	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	4	*
	5	* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
	6	* and Cort Dougan (PReP) (cort@cs.nmt.edu)
	7	* Copyright (C) 1996 Paul Mackerras
14cf11af PM	8	* PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
	9	*
	10	* Derived from "arch/i386/mm/init.c"
	11	* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License
	15	* as published by the Free Software Foundation; either version
	16	* 2 of the License, or (at your option) any later version.
	17	*
	18	*/
	19
14cf11af PM	20	#include <linux/module.h>
	21	#include <linux/sched.h>
	22	#include <linux/kernel.h>
	23	#include <linux/errno.h>
	24	#include <linux/string.h>
	25	#include <linux/types.h>
	26	#include <linux/mm.h>
	27	#include <linux/stddef.h>
	28	#include <linux/init.h>
	29	#include <linux/bootmem.h>
	30	#include <linux/highmem.h>
	31	#include <linux/initrd.h>
	32	#include <linux/pagemap.h>
d9b2b2a2	33	#include <linux/lmb.h>
14cf11af PM	34
	35	#include <asm/pgalloc.h>
	36	#include <asm/prom.h>
	37	#include <asm/io.h>
	38	#include <asm/mmu_context.h>
	39	#include <asm/pgtable.h>
	40	#include <asm/mmu.h>
	41	#include <asm/smp.h>
	42	#include <asm/machdep.h>
	43	#include <asm/btext.h>
	44	#include <asm/tlb.h>
7c8c6b97	45	#include <asm/sections.h>
14cf11af	46
14cf11af PM	47	#include "mmu_decl.h"
	48
	49	#if defined(CONFIG_KERNEL_START_BOOL) \|\| defined(CONFIG_LOWMEM_SIZE_BOOL)
	50	/* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */
	51	#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
	52	#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
	53	#endif
	54	#endif
	55	#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
	56
	57	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	58
	59	unsigned long total_memory;
	60	unsigned long total_lowmem;
	61
37dd2bad KG	62	phys_addr_t memstart_addr = (phys_addr_t)~0ull;
	63	EXPORT_SYMBOL(memstart_addr);
	64	phys_addr_t kernstart_addr;
	65	EXPORT_SYMBOL(kernstart_addr);
99c62dd7	66	phys_addr_t lowmem_end_addr;
14cf11af	67
14cf11af PM	68	int boot_mapsize;
	69	#ifdef CONFIG_PPC_PMAC
	70	unsigned long agp_special_page;
5c8c56eb	71	EXPORT_SYMBOL(agp_special_page);
14cf11af PM	72	#endif
14cf11af PM	73
14cf11af PM	74	#ifdef CONFIG_HIGHMEM
	75	pte_t *kmap_pte;
	76	pgprot_t kmap_prot;
	77
	78	EXPORT_SYMBOL(kmap_prot);
	79	EXPORT_SYMBOL(kmap_pte);
	80	#endif
	81
	82	void MMU_init(void);
14cf11af PM	83
	84	/* XXX should be in current.h -- paulus */
	85	extern struct task_struct *current_set[NR_CPUS];
	86
7c8c6b97 PM	87	extern int init_bootmem_done;
7c8c6b97 PM	88
14cf11af PM	89	/*
	90	* this tells the system to map all of ram with the segregs
	91	* (i.e. page tables) instead of the bats.
	92	* -- Cort
	93	*/
	94	int __map_without_bats;
	95	int __map_without_ltlbs;
	96
14cf11af PM	97	/* max amount of low RAM to map in */
	98	unsigned long __max_low_memory = MAX_LOW_MEM;
	99
	100	/*
09b5e63f	101	* address of the limit of what is accessible with initial MMU setup -
7c8c6b97	102	* 256MB usually, but only 16MB on 601.
14cf11af	103	*/
09b5e63f	104	phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000;
14cf11af PM	105
	106	/*
	107	* Check for command-line options that affect what MMU_init will do.
	108	*/
	109	void MMU_setup(void)
	110	{
	111	/* Check for nobats option (used in mapin_ram). */
	112	if (strstr(cmd_line, "nobats")) {
	113	__map_without_bats = 1;
	114	}
	115
	116	if (strstr(cmd_line, "noltlbs")) {
	117	__map_without_ltlbs = 1;
	118	}
88df6e90 BH	119	#ifdef CONFIG_DEBUG_PAGEALLOC
	120	__map_without_bats = 1;
	121	__map_without_ltlbs = 1;
	122	#endif
14cf11af PM	123	}
	124
	125	/*
	126	* MMU_init sets up the basic memory mappings for the kernel,
	127	* including both RAM and possibly some I/O regions,
	128	* and sets up the page tables and the MMU hardware ready to go.
	129	*/
	130	void __init MMU_init(void)
	131	{
	132	if (ppc_md.progress)
	133	ppc_md.progress("MMU:enter", 0x111);
	134
7c8c6b97 PM	135	/* 601 can only access 16MB at the moment */
7c8c6b97 PM	136	if (PVR_VER(mfspr(SPRN_PVR)) == 1)
09b5e63f	137	__initial_memory_limit_addr = 0x01000000;
544cdabe JT	138	/* 8xx can only access 8MB at the moment */
544cdabe JT	139	if (PVR_VER(mfspr(SPRN_PVR)) == 0x50)
09b5e63f	140	__initial_memory_limit_addr = 0x00800000;
7c8c6b97	141
14cf11af PM	142	/* parse args from command line */
	143	MMU_setup();
	144
7c8c6b97 PM	145	if (lmb.memory.cnt > 1) {
	146	lmb.memory.cnt = 1;
	147	lmb_analyze();
	148	printk(KERN_WARNING "Only using first contiguous memory region");
	149	}
	150
99c62dd7	151	total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr;
d7917ba7	152	lowmem_end_addr = memstart_addr + total_lowmem;
7c8c6b97	153
14cf11af PM	154	#ifdef CONFIG_FSL_BOOKE
	155	/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
	156	* entries, so we need to adjust lowmem to match the amount we can map
	157	* in the fixed entries */
	158	adjust_total_lowmem();
	159	#endif /* CONFIG_FSL_BOOKE */
fa39dc43	160
14cf11af PM	161	if (total_lowmem > __max_low_memory) {
14cf11af PM	162	total_lowmem = __max_low_memory;
d7917ba7	163	lowmem_end_addr = memstart_addr + total_lowmem;
14cf11af PM	164	#ifndef CONFIG_HIGHMEM
14cf11af PM	165	total_memory = total_lowmem;
d7917ba7	166	lmb_enforce_memory_limit(lowmem_end_addr);
fa39dc43	167	lmb_analyze();
14cf11af PM	168	#endif /* CONFIG_HIGHMEM */
14cf11af PM	169	}
14cf11af PM	170
	171	/* Initialize the MMU hardware */
	172	if (ppc_md.progress)
	173	ppc_md.progress("MMU:hw init", 0x300);
	174	MMU_init_hw();
	175
	176	/* Map in all of RAM starting at KERNELBASE */
	177	if (ppc_md.progress)
	178	ppc_md.progress("MMU:mapin", 0x301);
	179	mapin_ram();
	180
	181	#ifdef CONFIG_HIGHMEM
	182	ioremap_base = PKMAP_BASE;
	183	#else
	184	ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
	185	#endif /* CONFIG_HIGHMEM */
	186	ioremap_bot = ioremap_base;
	187
	188	/* Map in I/O resources */
	189	if (ppc_md.progress)
	190	ppc_md.progress("MMU:setio", 0x302);
14cf11af PM	191
	192	/* Initialize the context management stuff */
	193	mmu_context_init();
	194
	195	if (ppc_md.progress)
	196	ppc_md.progress("MMU:exit", 0x211);
51d3082f BH	197
	198	/* From now on, btext is no longer BAT mapped if it was at all */
	199	#ifdef CONFIG_BOOTX_TEXT
	200	btext_unmap();
	201	#endif
14cf11af PM	202	}
	203
	204	/* This is only called until mem_init is done. */
	205	void __init *early_get_page(void)
	206	{
	207	void *p;
	208
	209	if (init_bootmem_done) {
	210	p = alloc_bootmem_pages(PAGE_SIZE);
	211	} else {
7c8c6b97	212	p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
09b5e63f	213	__initial_memory_limit_addr));
14cf11af PM	214	}
	215	return p;
	216	}
	217
	218	/* Free up now-unused memory */
	219	static void free_sec(unsigned long start, unsigned long end, const char *name)
	220	{
	221	unsigned long cnt = 0;
	222
	223	while (start < end) {
	224	ClearPageReserved(virt_to_page(start));
7835e98b	225	init_page_count(virt_to_page(start));
14cf11af PM	226	free_page(start);
	227	cnt++;
	228	start += PAGE_SIZE;
	229	}
	230	if (cnt) {
	231	printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name);
	232	totalram_pages += cnt;
	233	}
	234	}
	235
	236	void free_initmem(void)
	237	{
	238	#define FREESEC(TYPE) \
	239	free_sec((unsigned long)(&__ ## TYPE ## _begin), \
	240	(unsigned long)(&__ ## TYPE ## _end), \
	241	#TYPE);
	242
	243	printk ("Freeing unused kernel memory:");
	244	FREESEC(init);
	245	printk("\n");
	246	ppc_md.progress = NULL;
	247	#undef FREESEC
	248	}
	249
	250	#ifdef CONFIG_BLK_DEV_INITRD
	251	void free_initrd_mem(unsigned long start, unsigned long end)
	252	{
	253	if (start < end)
	254	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
	255	for (; start < end; start += PAGE_SIZE) {
	256	ClearPageReserved(virt_to_page(start));
7835e98b	257	init_page_count(virt_to_page(start));
14cf11af PM	258	free_page(start);
	259	totalram_pages++;
	260	}
	261	}
	262	#endif
df174e3b ES	263
	264	#ifdef CONFIG_PROC_KCORE
	265	static struct kcore_list kcore_vmem;
	266
	267	static int __init setup_kcore(void)
	268	{
	269	int i;
	270
	271	for (i = 0; i < lmb.memory.cnt; i++) {
	272	unsigned long base;
	273	unsigned long size;
	274	struct kcore_list *kcore_mem;
	275
	276	base = lmb.memory.region[i].base;
	277	size = lmb.memory.region[i].size;
	278
	279	kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
	280	if (!kcore_mem)
e48b1b45	281	panic("%s: kmalloc failed\n", __func__);
df174e3b ES	282
	283	/* must stay under 32 bits */
	284	if ( 0xfffffffful - (unsigned long)__va(base) < size) {
	285	size = 0xfffffffful - (unsigned long)(__va(base));
	286	printk(KERN_DEBUG "setup_kcore: restrict size=%lx\n",
	287	size);
	288	}
	289
	290	kclist_add(kcore_mem, __va(base), size);
	291	}
	292
	293	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
	294	VMALLOC_END-VMALLOC_START);
	295
	296	return 0;
	297	}
	298	module_init(setup_kcore);
	299	#endif