[net-next-2.6.git] / arch / s390 / mm / init.c

/*
 *  arch/s390/mm/init.c
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
 *
 *  Derived from "arch/i386/mm/init.c"
 *    Copyright (C) 1995  Linus Torvalds
 */

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/initrd.h>
#include <linux/gfp.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>
#include <asm/lowcore.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/sections.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));

char  empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
EXPORT_SYMBOL(empty_zero_page);

/*
 * paging_init() sets up the page tables
 */
void __init paging_init(void)
{
	static const int ssm_mask = 0x04000000L;
	unsigned long max_zone_pfns[MAX_NR_ZONES];
	unsigned long pgd_type;

	init_mm.pgd = swapper_pg_dir;
	S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
#ifdef CONFIG_64BIT
	/* A three level page table (4TB) is enough for the kernel space. */
	S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
	pgd_type = _REGION3_ENTRY_EMPTY;
#else
	S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
	pgd_type = _SEGMENT_ENTRY_EMPTY;
#endif
	clear_table((unsigned long *) init_mm.pgd, pgd_type,
		    sizeof(unsigned long)*2048);
	vmem_map_init();

        /* enable virtual mapping in kernel mode */
	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
	__raw_local_irq_ssm(ssm_mask);

	atomic_set(&init_mm.context.attach_count, 1);

	sparse_memory_present_with_active_regions(MAX_NUMNODES);
	sparse_init();
	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
#ifdef CONFIG_ZONE_DMA
	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
#endif
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	free_area_init_nodes(max_zone_pfns);
}

void __init mem_init(void)
{
	unsigned long codesize, reservedpages, datasize, initsize;

        max_mapnr = num_physpages = max_low_pfn;
        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);

        /* clear the zero-page */
        memset(empty_zero_page, 0, PAGE_SIZE);

	/* Setup guest page hinting */
	cmma_init();

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

	reservedpages = 0;

	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
        printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
		nr_free_pages() << (PAGE_SHIFT-10),
                max_mapnr << (PAGE_SHIFT-10),
                codesize >> 10,
                reservedpages << (PAGE_SHIFT-10),
                datasize >>10,
                initsize >> 10);
	printk("Write protected kernel read-only data: %#lx - %#lx\n",
	       (unsigned long)&_stext,
	       PFN_ALIGN((unsigned long)&_eshared) - 1);
}

#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	unsigned long address;
	int i;

	for (i = 0; i < numpages; i++) {
		address = page_to_phys(page + i);
		pgd = pgd_offset_k(address);
		pud = pud_offset(pgd, address);
		pmd = pmd_offset(pud, address);
		pte = pte_offset_kernel(pmd, address);
		if (!enable) {
			ptep_invalidate(&init_mm, address, pte);
			continue;
		}
		*pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
		/* Flush cpu write queue. */
		mb();
	}
}
#endif

void free_init_pages(char *what, unsigned long begin, unsigned long end)
{
	unsigned long addr = begin;

	if (begin >= end)
		return;
	for (; addr < end; addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
		       PAGE_SIZE);
		free_page(addr);
		totalram_pages++;
	}
	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
}

void free_initmem(void)
{
	free_init_pages("unused kernel memory",
			(unsigned long)&__init_begin,
			(unsigned long)&__init_end);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	free_init_pages("initrd memory", start, end);
}
#endif

#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size)
{
	struct pglist_data *pgdat;
	struct zone *zone;
	int rc;

	pgdat = NODE_DATA(nid);
	zone = pgdat->node_zones + ZONE_MOVABLE;
	rc = vmem_add_mapping(start, size);
	if (rc)
		return rc;
	rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
	if (rc)
		vmem_remove_mapping(start, size);
	return rc;
}
#endif /* CONFIG_MEMORY_HOTPLUG */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/s390/mm/init.c
	3	*
	4	* S390 version
	5	* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
	6	* Author(s): Hartmut Penner (hp@de.ibm.com)
	7	*
	8	* Derived from "arch/i386/mm/init.c"
	9	* Copyright (C) 1995 Linus Torvalds
	10	*/
	11
1da177e4 LT	12	#include <linux/signal.h>
	13	#include <linux/sched.h>
	14	#include <linux/kernel.h>
	15	#include <linux/errno.h>
	16	#include <linux/string.h>
	17	#include <linux/types.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/mman.h>
	20	#include <linux/mm.h>
	21	#include <linux/swap.h>
	22	#include <linux/smp.h>
	23	#include <linux/init.h>
	24	#include <linux/pagemap.h>
	25	#include <linux/bootmem.h>
d882b172	26	#include <linux/pfn.h>
028d9b3c	27	#include <linux/poison.h>
2b67fc46	28	#include <linux/initrd.h>
5a0e3ad6	29	#include <linux/gfp.h>
1da177e4 LT	30	#include <asm/processor.h>
	31	#include <asm/system.h>
	32	#include <asm/uaccess.h>
	33	#include <asm/pgtable.h>
	34	#include <asm/pgalloc.h>
	35	#include <asm/dma.h>
	36	#include <asm/lowcore.h>
	37	#include <asm/tlb.h>
	38	#include <asm/tlbflush.h>
d882b172	39	#include <asm/sections.h>
1da177e4 LT	40
	41	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	42
	43	pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
1485c5c8	44
1da177e4	45	char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
1485c5c8	46	EXPORT_SYMBOL(empty_zero_page);
1da177e4	47
1da177e4 LT	48	/*
	49	* paging_init() sets up the page tables
	50	*/
1da177e4 LT	51	void __init paging_init(void)
1da177e4 LT	52	{
f4eb07c1	53	static const int ssm_mask = 0x04000000L;
39b742f9	54	unsigned long max_zone_pfns[MAX_NR_ZONES];
3610cce8	55	unsigned long pgd_type;
d882b172	56
3610cce8 MS	57	init_mm.pgd = swapper_pg_dir;
3610cce8 MS	58	S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
f4eb07c1	59	#ifdef CONFIG_64BIT
6252d702 MS	60	/* A three level page table (4TB) is enough for the kernel space. */
	61	S390_lowcore.kernel_asce \|= _ASCE_TYPE_REGION3 \| _ASCE_TABLE_LENGTH;
	62	pgd_type = _REGION3_ENTRY_EMPTY;
f4eb07c1	63	#else
3610cce8 MS	64	S390_lowcore.kernel_asce \|= _ASCE_TABLE_LENGTH;
3610cce8 MS	65	pgd_type = _SEGMENT_ENTRY_EMPTY;
f4eb07c1	66	#endif
3610cce8 MS	67	clear_table((unsigned long *) init_mm.pgd, pgd_type,
3610cce8 MS	68	sizeof(unsigned long)*2048);
f4eb07c1	69	vmem_map_init();
1da177e4	70
1da177e4	71	/* enable virtual mapping in kernel mode */
3610cce8 MS	72	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	73	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	74	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
94c12cc7	75	__raw_local_irq_ssm(ssm_mask);
1da177e4	76
050eef36 MS	77	atomic_set(&init_mm.context.attach_count, 1);
050eef36 MS	78
17f34580 HC	79	sparse_memory_present_with_active_regions(MAX_NUMNODES);
17f34580 HC	80	sparse_init();
39b742f9	81	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
118bcd31	82	#ifdef CONFIG_ZONE_DMA
39b742f9	83	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
118bcd31	84	#endif
39b742f9 HC	85	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
39b742f9 HC	86	free_area_init_nodes(max_zone_pfns);
1da177e4	87	}
1da177e4 LT	88
	89	void __init mem_init(void)
	90	{
	91	unsigned long codesize, reservedpages, datasize, initsize;
	92
	93	max_mapnr = num_physpages = max_low_pfn;
	94	high_memory = (void ) __va(max_low_pfn PAGE_SIZE);
	95
	96	/* clear the zero-page */
	97	memset(empty_zero_page, 0, PAGE_SIZE);
	98
45e576b1 MS	99	/* Setup guest page hinting */
	100	cmma_init();
	101
1da177e4 LT	102	/* this will put all low memory onto the freelists */
	103	totalram_pages += free_all_bootmem();
	104
	105	reservedpages = 0;
	106
	107	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	108	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	109	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	110	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
cc013a88	111	nr_free_pages() << (PAGE_SHIFT-10),
1da177e4 LT	112	max_mapnr << (PAGE_SHIFT-10),
	113	codesize >> 10,
	114	reservedpages << (PAGE_SHIFT-10),
	115	datasize >>10,
	116	initsize >> 10);
d882b172	117	printk("Write protected kernel read-only data: %#lx - %#lx\n",
162e006e HC	118	(unsigned long)&_stext,
162e006e HC	119	PFN_ALIGN((unsigned long)&_eshared) - 1);
1da177e4 LT	120	}
1da177e4 LT	121
2485579b HC	122	#ifdef CONFIG_DEBUG_PAGEALLOC
	123	void kernel_map_pages(struct page *page, int numpages, int enable)
	124	{
	125	pgd_t *pgd;
	126	pud_t *pud;
	127	pmd_t *pmd;
	128	pte_t *pte;
	129	unsigned long address;
	130	int i;
	131
	132	for (i = 0; i < numpages; i++) {
	133	address = page_to_phys(page + i);
	134	pgd = pgd_offset_k(address);
	135	pud = pud_offset(pgd, address);
	136	pmd = pmd_offset(pud, address);
	137	pte = pte_offset_kernel(pmd, address);
	138	if (!enable) {
146e4b3c	139	ptep_invalidate(&init_mm, address, pte);
2485579b HC	140	continue;
	141	}
	142	*pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
	143	/* Flush cpu write queue. */
	144	mb();
	145	}
	146	}
	147	#endif
	148
d96221ab	149	void free_init_pages(char *what, unsigned long begin, unsigned long end)
1da177e4	150	{
d96221ab	151	unsigned long addr = begin;
1da177e4	152
d96221ab HC	153	if (begin >= end)
	154	return;
	155	for (; addr < end; addr += PAGE_SIZE) {
1da177e4	156	ClearPageReserved(virt_to_page(addr));
7835e98b	157	init_page_count(virt_to_page(addr));
d96221ab HC	158	memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
d96221ab HC	159	PAGE_SIZE);
1da177e4 LT	160	free_page(addr);
1da177e4 LT	161	totalram_pages++;
d96221ab HC	162	}
	163	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
	164	}
	165
	166	void free_initmem(void)
	167	{
	168	free_init_pages("unused kernel memory",
	169	(unsigned long)&__init_begin,
	170	(unsigned long)&__init_end);
1da177e4 LT	171	}
	172
	173	#ifdef CONFIG_BLK_DEV_INITRD
	174	void free_initrd_mem(unsigned long start, unsigned long end)
	175	{
d96221ab	176	free_init_pages("initrd memory", start, end);
1da177e4 LT	177	}
1da177e4 LT	178	#endif
421c175c HC	179
	180	#ifdef CONFIG_MEMORY_HOTPLUG
	181	int arch_add_memory(int nid, u64 start, u64 size)
	182	{
	183	struct pglist_data *pgdat;
	184	struct zone *zone;
	185	int rc;
	186
	187	pgdat = NODE_DATA(nid);
7e9238fb	188	zone = pgdat->node_zones + ZONE_MOVABLE;
421c175c HC	189	rc = vmem_add_mapping(start, size);
	190	if (rc)
	191	return rc;
c04fc586	192	rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
421c175c HC	193	if (rc)
	194	vmem_remove_mapping(start, size);
	195	return rc;
	196	}
	197	#endif /* CONFIG_MEMORY_HOTPLUG */