[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 <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>

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

unsigned long empty_zero_page, zero_page_mask;
EXPORT_SYMBOL(empty_zero_page);

static unsigned long setup_zero_pages(void)
{
	struct cpuid cpu_id;
	unsigned int order;
	unsigned long size;
	struct page *page;
	int i;

	get_cpu_id(&cpu_id);
	switch (cpu_id.machine) {
	case 0x9672:	/* g5 */
	case 0x2064:	/* z900 */
	case 0x2066:	/* z900 */
	case 0x2084:	/* z990 */
	case 0x2086:	/* z990 */
	case 0x2094:	/* z9-109 */
	case 0x2096:	/* z9-109 */
		order = 0;
		break;
	case 0x2097:	/* z10 */
	case 0x2098:	/* z10 */
	default:
		order = 2;
		break;
	}

	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
	if (!empty_zero_page)
		panic("Out of memory in setup_zero_pages");

	page = virt_to_page((void *) empty_zero_page);
	split_page(page, order);
	for (i = 1 << order; i > 0; i--) {
		SetPageReserved(page);
		page++;
	}

	size = PAGE_SIZE << order;
	zero_page_mask = (size - 1) & PAGE_MASK;

	return 1UL << order;
}

/*
 * paging_init() sets up the page tables
 */
void __init paging_init(void)
{
	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);
	arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));

	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));
	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	free_area_init_nodes(max_zone_pfns);
	fault_init();
}

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);

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

	/* this will put all low memory onto the freelists */
	totalram_pages += free_all_bootmem();
	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages. */

	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_ipte(address, pte);
			pte_val(*pte) = _PAGE_TYPE_EMPTY;
			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	40
1da177e4	41	pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
1485c5c8	42
238ec4ef	43	unsigned long empty_zero_page, zero_page_mask;
1485c5c8	44	EXPORT_SYMBOL(empty_zero_page);
1da177e4	45
238ec4ef MS	46	static unsigned long setup_zero_pages(void)
	47	{
	48	struct cpuid cpu_id;
	49	unsigned int order;
	50	unsigned long size;
	51	struct page *page;
	52	int i;
	53
	54	get_cpu_id(&cpu_id);
	55	switch (cpu_id.machine) {
	56	case 0x9672: /* g5 */
	57	case 0x2064: /* z900 */
	58	case 0x2066: /* z900 */
	59	case 0x2084: /* z990 */
	60	case 0x2086: /* z990 */
	61	case 0x2094: /* z9-109 */
	62	case 0x2096: /* z9-109 */
	63	order = 0;
	64	break;
	65	case 0x2097: /* z10 */
	66	case 0x2098: /* z10 */
	67	default:
	68	order = 2;
	69	break;
	70	}
	71
	72	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	73	if (!empty_zero_page)
	74	panic("Out of memory in setup_zero_pages");
	75
	76	page = virt_to_page((void *) empty_zero_page);
	77	split_page(page, order);
	78	for (i = 1 << order; i > 0; i--) {
	79	SetPageReserved(page);
	80	page++;
	81	}
	82
	83	size = PAGE_SIZE << order;
	84	zero_page_mask = (size - 1) & PAGE_MASK;
	85
	86	return 1UL << order;
	87	}
	88
1da177e4 LT	89	/*
	90	* paging_init() sets up the page tables
	91	*/
1da177e4 LT	92	void __init paging_init(void)
1da177e4 LT	93	{
39b742f9	94	unsigned long max_zone_pfns[MAX_NR_ZONES];
3610cce8	95	unsigned long pgd_type;
d882b172	96
3610cce8 MS	97	init_mm.pgd = swapper_pg_dir;
3610cce8 MS	98	S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
f4eb07c1	99	#ifdef CONFIG_64BIT
6252d702 MS	100	/* A three level page table (4TB) is enough for the kernel space. */
	101	S390_lowcore.kernel_asce \|= _ASCE_TYPE_REGION3 \| _ASCE_TABLE_LENGTH;
	102	pgd_type = _REGION3_ENTRY_EMPTY;
f4eb07c1	103	#else
3610cce8 MS	104	S390_lowcore.kernel_asce \|= _ASCE_TABLE_LENGTH;
3610cce8 MS	105	pgd_type = _SEGMENT_ENTRY_EMPTY;
f4eb07c1	106	#endif
3610cce8 MS	107	clear_table((unsigned long *) init_mm.pgd, pgd_type,
3610cce8 MS	108	sizeof(unsigned long)*2048);
f4eb07c1	109	vmem_map_init();
1da177e4	110
1da177e4	111	/* enable virtual mapping in kernel mode */
3610cce8 MS	112	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	113	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	114	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
df9ee292	115	arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
1da177e4	116
050eef36 MS	117	atomic_set(&init_mm.context.attach_count, 1);
050eef36 MS	118
17f34580 HC	119	sparse_memory_present_with_active_regions(MAX_NUMNODES);
17f34580 HC	120	sparse_init();
39b742f9 HC	121	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
	122	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
	123	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	124	free_area_init_nodes(max_zone_pfns);
92f842ea	125	fault_init();
1da177e4	126	}
1da177e4 LT	127
	128	void __init mem_init(void)
	129	{
	130	unsigned long codesize, reservedpages, datasize, initsize;
	131
	132	max_mapnr = num_physpages = max_low_pfn;
	133	high_memory = (void ) __va(max_low_pfn PAGE_SIZE);
	134
45e576b1 MS	135	/* Setup guest page hinting */
	136	cmma_init();
	137
1da177e4 LT	138	/* this will put all low memory onto the freelists */
1da177e4 LT	139	totalram_pages += free_all_bootmem();
238ec4ef	140	totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
1da177e4 LT	141
	142	reservedpages = 0;
	143
	144	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	145	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	146	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	147	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
cc013a88	148	nr_free_pages() << (PAGE_SHIFT-10),
1da177e4 LT	149	max_mapnr << (PAGE_SHIFT-10),
	150	codesize >> 10,
	151	reservedpages << (PAGE_SHIFT-10),
	152	datasize >>10,
	153	initsize >> 10);
d882b172	154	printk("Write protected kernel read-only data: %#lx - %#lx\n",
162e006e HC	155	(unsigned long)&_stext,
162e006e HC	156	PFN_ALIGN((unsigned long)&_eshared) - 1);
1da177e4 LT	157	}
1da177e4 LT	158
2485579b HC	159	#ifdef CONFIG_DEBUG_PAGEALLOC
	160	void kernel_map_pages(struct page *page, int numpages, int enable)
	161	{
	162	pgd_t *pgd;
	163	pud_t *pud;
	164	pmd_t *pmd;
	165	pte_t *pte;
	166	unsigned long address;
	167	int i;
	168
	169	for (i = 0; i < numpages; i++) {
	170	address = page_to_phys(page + i);
	171	pgd = pgd_offset_k(address);
	172	pud = pud_offset(pgd, address);
	173	pmd = pmd_offset(pud, address);
	174	pte = pte_offset_kernel(pmd, address);
	175	if (!enable) {
b2fa47e6 MS	176	__ptep_ipte(address, pte);
b2fa47e6 MS	177	pte_val(*pte) = _PAGE_TYPE_EMPTY;
2485579b HC	178	continue;
	179	}
	180	*pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
	181	/* Flush cpu write queue. */
	182	mb();
	183	}
	184	}
	185	#endif
	186
d96221ab	187	void free_init_pages(char *what, unsigned long begin, unsigned long end)
1da177e4	188	{
d96221ab	189	unsigned long addr = begin;
1da177e4	190
d96221ab HC	191	if (begin >= end)
	192	return;
	193	for (; addr < end; addr += PAGE_SIZE) {
1da177e4	194	ClearPageReserved(virt_to_page(addr));
7835e98b	195	init_page_count(virt_to_page(addr));
d96221ab HC	196	memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
d96221ab HC	197	PAGE_SIZE);
1da177e4 LT	198	free_page(addr);
1da177e4 LT	199	totalram_pages++;
d96221ab HC	200	}
	201	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
	202	}
	203
	204	void free_initmem(void)
	205	{
	206	free_init_pages("unused kernel memory",
	207	(unsigned long)&__init_begin,
	208	(unsigned long)&__init_end);
1da177e4 LT	209	}
	210
	211	#ifdef CONFIG_BLK_DEV_INITRD
	212	void free_initrd_mem(unsigned long start, unsigned long end)
	213	{
d96221ab	214	free_init_pages("initrd memory", start, end);
1da177e4 LT	215	}
1da177e4 LT	216	#endif
421c175c HC	217
	218	#ifdef CONFIG_MEMORY_HOTPLUG
	219	int arch_add_memory(int nid, u64 start, u64 size)
	220	{
	221	struct pglist_data *pgdat;
	222	struct zone *zone;
	223	int rc;
	224
	225	pgdat = NODE_DATA(nid);
7e9238fb	226	zone = pgdat->node_zones + ZONE_MOVABLE;
421c175c HC	227	rc = vmem_add_mapping(start, size);
	228	if (rc)
	229	return rc;
c04fc586	230	rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
421c175c HC	231	if (rc)
	232	vmem_remove_mapping(start, size);
	233	return rc;
	234	}
	235	#endif /* CONFIG_MEMORY_HOTPLUG */