[deliverable/linux.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 <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);

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