[deliverable/linux.git] / arch / frv / mm / init.c

/* init.c: memory initialisation for FRV
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 *
 * Derived from:
 *  - linux/arch/m68knommu/mm/init.c
 *    - Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>, Kenneth Albanowski <kjahds@kjahds.com>,
 *    - Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
 *  - linux/arch/m68k/mm/init.c
 *    - Copyright (C) 1995  Hamish Macdonald
 */

#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>

#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/virtconvert.h>
#include <asm/sections.h>
#include <asm/tlb.h>

#undef DEBUG

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

/*
 * BAD_PAGE is the page that is used for page faults when linux
 * is out-of-memory. Older versions of linux just did a
 * do_exit(), but using this instead means there is less risk
 * for a process dying in kernel mode, possibly leaving a inode
 * unused etc..
 *
 * BAD_PAGETABLE is the accompanying page-table: it is initialized
 * to point to BAD_PAGE entries.
 *
 * ZERO_PAGE is a special page that is used for zero-initialized
 * data and COW.
 */
static unsigned long empty_bad_page_table;
static unsigned long empty_bad_page;
unsigned long empty_zero_page;

/*****************************************************************************/
/*
 *
 */
void show_mem(void)
{
	unsigned long i;
	int free = 0, total = 0, reserved = 0, shared = 0;

	printk("\nMem-info:\n");
	show_free_areas();
	i = max_mapnr;
	while (i-- > 0) {
		struct page *page = &mem_map[i];

		total++;
		if (PageReserved(page))
			reserved++;
		else if (!page_count(page))
			free++;
		else
			shared += page_count(page) - 1;
	}

	printk("%d pages of RAM\n",total);
	printk("%d free pages\n",free);
	printk("%d reserved pages\n",reserved);
	printk("%d pages shared\n",shared);

} /* end show_mem() */

/*****************************************************************************/
/*
 * paging_init() continues the virtual memory environment setup which
 * was begun by the code in arch/head.S.
 * The parameters are pointers to where to stick the starting and ending
 * addresses  of available kernel virtual memory.
 */
void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};

	/* allocate some pages for kernel housekeeping tasks */
	empty_bad_page_table	= (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
	empty_bad_page		= (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
	empty_zero_page		= (unsigned long) alloc_bootmem_pages(PAGE_SIZE);

	memset((void *) empty_zero_page, 0, PAGE_SIZE);

#ifdef CONFIG_HIGHMEM
	if (num_physpages - num_mappedpages) {
		pgd_t *pge;
		pud_t *pue;
		pmd_t *pme;

		pkmap_page_table = alloc_bootmem_pages(PAGE_SIZE);

		memset(pkmap_page_table, 0, PAGE_SIZE);

		pge = swapper_pg_dir + pgd_index_k(PKMAP_BASE);
		pue = pud_offset(pge, PKMAP_BASE);
		pme = pmd_offset(pue, PKMAP_BASE);
		__set_pmd(pme, virt_to_phys(pkmap_page_table) | _PAGE_TABLE);
	}
#endif

	/* distribute the allocatable pages across the various zones and pass them to the allocator
	 */
	zones_size[ZONE_DMA]     = max_low_pfn - min_low_pfn;
	zones_size[ZONE_NORMAL]  = 0;
#ifdef CONFIG_HIGHMEM
	zones_size[ZONE_HIGHMEM] = num_physpages - num_mappedpages;
#endif

	free_area_init(zones_size);

#ifdef CONFIG_MMU
	/* initialise init's MMU context */
	init_new_context(&init_task, &init_mm);
#endif

} /* end paging_init() */

/*****************************************************************************/
/*
 *
 */
void __init mem_init(void)
{
	unsigned long npages = (memory_end - memory_start) >> PAGE_SHIFT;
	unsigned long tmp;
#ifdef CONFIG_MMU
	unsigned long loop, pfn;
	int datapages = 0;
#endif
	int codek = 0, datak = 0;

	/* this will put all memory onto the freelists */
	totalram_pages = free_all_bootmem();

#ifdef CONFIG_MMU
	for (loop = 0 ; loop < npages ; loop++)
		if (PageReserved(&mem_map[loop]))
			datapages++;

#ifdef CONFIG_HIGHMEM
	for (pfn = num_physpages - 1; pfn >= num_mappedpages; pfn--) {
		struct page *page = &mem_map[pfn];

		ClearPageReserved(page);
		init_page_count(page);
		__free_page(page);
		totalram_pages++;
	}
#endif

	codek = ((unsigned long) &_etext - (unsigned long) &_stext) >> 10;
	datak = datapages << (PAGE_SHIFT - 10);

#else
	codek = (_etext - _stext) >> 10;
	datak = 0; //(_ebss - _sdata) >> 10;
#endif

	tmp = nr_free_pages() << PAGE_SHIFT;
	printk("Memory available: %luKiB/%luKiB RAM, %luKiB/%luKiB ROM (%dKiB kernel code, %dKiB data)\n",
	       tmp >> 10,
	       npages << (PAGE_SHIFT - 10),
	       (rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
	       rom_length >> 10,
	       codek,
	       datak
	       );

} /* end mem_init() */

/*****************************************************************************/
/*
 * free the memory that was only required for initialisation
 */
void __init free_initmem(void)
{
#if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL)
	unsigned long start, end, addr;

	start = PAGE_ALIGN((unsigned long) &__init_begin);	/* round up */
	end   = ((unsigned long) &__init_end) & PAGE_MASK;	/* round down */

	/* next to check that the page we free is not a partial page */
	for (addr = start; addr < end; addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		free_page(addr);
		totalram_pages++;
	}

	printk("Freeing unused kernel memory: %ldKiB freed (0x%lx - 0x%lx)\n",
	       (end - start) >> 10, start, end);
#endif
} /* end free_initmem() */

/*****************************************************************************/
/*
 * free the initial ramdisk memory
 */
#ifdef CONFIG_BLK_DEV_INITRD
void __init 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("Freeing initrd memory: %dKiB freed\n", (pages * PAGE_SIZE) >> 10);
} /* end free_initrd_mem() */
#endif
Commit	Line	Data
1da177e4 LT	1	/* init.c: memory initialisation for FRV
	2	*
	3	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*
	11	* Derived from:
	12	* - linux/arch/m68knommu/mm/init.c
	13	* - Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, Kenneth Albanowski <kjahds@kjahds.com>,
	14	* - Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
	15	* - linux/arch/m68k/mm/init.c
	16	* - Copyright (C) 1995 Hamish Macdonald
	17	*/
	18
	19	#include <linux/config.h>
	20	#include <linux/signal.h>
	21	#include <linux/sched.h>
	22	#include <linux/pagemap.h>
	23	#include <linux/swap.h>
	24	#include <linux/mm.h>
	25	#include <linux/kernel.h>
	26	#include <linux/string.h>
	27	#include <linux/types.h>
	28	#include <linux/bootmem.h>
	29	#include <linux/highmem.h>
	30
	31	#include <asm/setup.h>
	32	#include <asm/segment.h>
	33	#include <asm/page.h>
	34	#include <asm/pgtable.h>
	35	#include <asm/system.h>
	36	#include <asm/mmu_context.h>
	37	#include <asm/virtconvert.h>
	38	#include <asm/sections.h>
	39	#include <asm/tlb.h>
	40
	41	#undef DEBUG
	42
	43	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	44
	45	/*
	46	* BAD_PAGE is the page that is used for page faults when linux
	47	* is out-of-memory. Older versions of linux just did a
	48	* do_exit(), but using this instead means there is less risk
	49	* for a process dying in kernel mode, possibly leaving a inode
	50	* unused etc..
	51	*
	52	* BAD_PAGETABLE is the accompanying page-table: it is initialized
	53	* to point to BAD_PAGE entries.
	54	*
	55	* ZERO_PAGE is a special page that is used for zero-initialized
	56	* data and COW.
	57	*/
	58	static unsigned long empty_bad_page_table;
	59	static unsigned long empty_bad_page;
	60	unsigned long empty_zero_page;
	61
	62	/*****************************************************************************/
	63	/*
	64	*
65	*/
66	void show_mem(void)
67	{
68	unsigned long i;
69	int free = 0, total = 0, reserved = 0, shared = 0;
70
71	printk("\nMem-info:\n");
72	show_free_areas();
73	i = max_mapnr;
74	while (i-- > 0) {
75	struct page *page = &mem_map[i];
76
77	total++;
78	if (PageReserved(page))
79	reserved++;
80	else if (!page_count(page))
81	free++;
82	else
83	shared += page_count(page) - 1;
84	}
85
86	printk("%d pages of RAM\n",total);
87	printk("%d free pages\n",free);
88	printk("%d reserved pages\n",reserved);
89	printk("%d pages shared\n",shared);
90
91	} /* end show_mem() */
92
93	/*****************************************************************************/
94	/*
95	* paging_init() continues the virtual memory environment setup which
96	* was begun by the code in arch/head.S.
97	* The parameters are pointers to where to stick the starting and ending
98	* addresses of available kernel virtual memory.
99	*/
100	void __init paging_init(void)
101	{
102	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
103
104	/* allocate some pages for kernel housekeeping tasks */
105	empty_bad_page_table = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
106	empty_bad_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
107	empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
108
109	memset((void *) empty_zero_page, 0, PAGE_SIZE);
110
8080f231	111	#ifdef CONFIG_HIGHMEM
1da177e4 LT	112	if (num_physpages - num_mappedpages) {
	113	pgd_t *pge;
	114	pud_t *pue;
	115	pmd_t *pme;
	116
	117	pkmap_page_table = alloc_bootmem_pages(PAGE_SIZE);
	118
	119	memset(pkmap_page_table, 0, PAGE_SIZE);
	120
	121	pge = swapper_pg_dir + pgd_index_k(PKMAP_BASE);
	122	pue = pud_offset(pge, PKMAP_BASE);
	123	pme = pmd_offset(pue, PKMAP_BASE);
	124	__set_pmd(pme, virt_to_phys(pkmap_page_table) \| _PAGE_TABLE);
	125	}
	126	#endif
	127
	128	/* distribute the allocatable pages across the various zones and pass them to the allocator
	129	*/
	130	zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
	131	zones_size[ZONE_NORMAL] = 0;
	132	#ifdef CONFIG_HIGHMEM
	133	zones_size[ZONE_HIGHMEM] = num_physpages - num_mappedpages;
	134	#endif
	135
	136	free_area_init(zones_size);
	137
	138	#ifdef CONFIG_MMU
	139	/* initialise init's MMU context */
	140	init_new_context(&init_task, &init_mm);
	141	#endif
	142
	143	} /* end paging_init() */
	144
	145	/*****************************************************************************/
	146	/*
	147	*
	148	*/
	149	void __init mem_init(void)
	150	{
	151	unsigned long npages = (memory_end - memory_start) >> PAGE_SHIFT;
	152	unsigned long tmp;
	153	#ifdef CONFIG_MMU
	154	unsigned long loop, pfn;
	155	int datapages = 0;
	156	#endif
	157	int codek = 0, datak = 0;
	158
	159	/* this will put all memory onto the freelists */
	160	totalram_pages = free_all_bootmem();
	161
	162	#ifdef CONFIG_MMU
	163	for (loop = 0 ; loop < npages ; loop++)
	164	if (PageReserved(&mem_map[loop]))
	165	datapages++;
	166
	167	#ifdef CONFIG_HIGHMEM
	168	for (pfn = num_physpages - 1; pfn >= num_mappedpages; pfn--) {
	169	struct page *page = &mem_map[pfn];
	170
	171	ClearPageReserved(page);
7835e98b	172	init_page_count(page);
1da177e4 LT	173	__free_page(page);
	174	totalram_pages++;
	175	}
	176	#endif
	177
	178	codek = ((unsigned long) &_etext - (unsigned long) &_stext) >> 10;
	179	datak = datapages << (PAGE_SHIFT - 10);
	180
	181	#else
	182	codek = (_etext - _stext) >> 10;
	183	datak = 0; //(_ebss - _sdata) >> 10;
	184	#endif
	185
	186	tmp = nr_free_pages() << PAGE_SHIFT;
	187	printk("Memory available: %luKiB/%luKiB RAM, %luKiB/%luKiB ROM (%dKiB kernel code, %dKiB data)\n",
	188	tmp >> 10,
	189	npages << (PAGE_SHIFT - 10),
	190	(rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
	191	rom_length >> 10,
	192	codek,
	193	datak
	194	);
	195
	196	} /* end mem_init() */
	197
	198	/*****************************************************************************/
	199	/*
	200	* free the memory that was only required for initialisation
	201	*/
	202	void __init free_initmem(void)
	203	{
	204	#if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL)
	205	unsigned long start, end, addr;
	206
	207	start = PAGE_ALIGN((unsigned long) &__init_begin); /* round up */
	208	end = ((unsigned long) &__init_end) & PAGE_MASK; /* round down */
	209
	210	/* next to check that the page we free is not a partial page */
	211	for (addr = start; addr < end; addr += PAGE_SIZE) {
	212	ClearPageReserved(virt_to_page(addr));
7835e98b	213	init_page_count(virt_to_page(addr));
1da177e4 LT	214	free_page(addr);
	215	totalram_pages++;
	216	}
	217
	218	printk("Freeing unused kernel memory: %ldKiB freed (0x%lx - 0x%lx)\n",
	219	(end - start) >> 10, start, end);
	220	#endif
	221	} /* end free_initmem() */
	222
	223	/*****************************************************************************/
	224	/*
	225	* free the initial ramdisk memory
	226	*/
	227	#ifdef CONFIG_BLK_DEV_INITRD
	228	void __init free_initrd_mem(unsigned long start, unsigned long end)
	229	{
	230	int pages = 0;
	231	for (; start < end; start += PAGE_SIZE) {
	232	ClearPageReserved(virt_to_page(start));
7835e98b	233	init_page_count(virt_to_page(start));
1da177e4 LT	234	free_page(start);
	235	totalram_pages++;
	236	pages++;
	237	}
	238	printk("Freeing initrd memory: %dKiB freed\n", (pages * PAGE_SIZE) >> 10);
	239	} /* end free_initrd_mem() */
	240	#endif