[deliverable/linux.git] / arch / s390 / mm / init.c

/*
 *  S390 version
 *    Copyright IBM Corp. 1999
 *    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/memory.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/initrd.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <asm/processor.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>
#include <asm/ctl_reg.h>
#include <asm/sclp.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 void __init setup_zero_pages(void)
{
	struct cpuid cpu_id;
	unsigned int order;
	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 */
	case 0x2817:	/* z196 */
	case 0x2818:	/* z196 */
		order = 2;
		break;
	case 0x2827:	/* zEC12 */
	default:
		order = 5;
		break;
	}
	/* Limit number of empty zero pages for small memory sizes */
	if (order > 2 && totalram_pages <= 16384)
		order = 2;

	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--) {
		mark_page_reserved(page);
		page++;
	}

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

/*
 * paging_init() sets up the page tables
 */
void __init paging_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES];
	unsigned long pgd_type, asce_bits;

	init_mm.pgd = swapper_pg_dir;
#ifdef CONFIG_64BIT
	if (VMALLOC_END > (1UL << 42)) {
		asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
		pgd_type = _REGION2_ENTRY_EMPTY;
	} else {
		asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
		pgd_type = _REGION3_ENTRY_EMPTY;
	}
#else
	asce_bits = _ASCE_TABLE_LENGTH;
	pgd_type = _SEGMENT_ENTRY_EMPTY;
#endif
	S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
	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);
}

void __init mem_init(void)
{
        max_mapnr = 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 */
	free_all_bootmem();
	setup_zero_pages();	/* Setup zeroed pages. */

	mem_init_print_info(NULL);
	printk("Write protected kernel read-only data: %#lx - %#lx\n",
	       (unsigned long)&_stext,
	       PFN_ALIGN((unsigned long)&_eshared) - 1);
}

void free_initmem(void)
{
	free_initmem_default(POISON_FREE_INITMEM);
}

#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
			   "initrd");
}
#endif

#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size)
{
	unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
	unsigned long start_pfn = PFN_DOWN(start);
	unsigned long size_pages = PFN_DOWN(size);
	struct zone *zone;
	int rc;

	rc = vmem_add_mapping(start, size);
	if (rc)
		return rc;
	for_each_zone(zone) {
		if (zone_idx(zone) != ZONE_MOVABLE) {
			/* Add range within existing zone limits */
			zone_start_pfn = zone->zone_start_pfn;
			zone_end_pfn = zone->zone_start_pfn +
				       zone->spanned_pages;
		} else {
			/* Add remaining range to ZONE_MOVABLE */
			zone_start_pfn = start_pfn;
			zone_end_pfn = start_pfn + size_pages;
		}
		if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
			continue;
		nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
			   zone_end_pfn - start_pfn : size_pages;
		rc = __add_pages(nid, zone, start_pfn, nr_pages);
		if (rc)
			break;
		start_pfn += nr_pages;
		size_pages -= nr_pages;
		if (!size_pages)
			break;
	}
	if (rc)
		vmem_remove_mapping(start, size);
	return rc;
}

unsigned long memory_block_size_bytes(void)
{
	/*
	 * Make sure the memory block size is always greater
	 * or equal than the memory increment size.
	 */
	return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm());
}

#ifdef CONFIG_MEMORY_HOTREMOVE
int arch_remove_memory(u64 start, u64 size)
{
	/*
	 * There is no hardware or firmware interface which could trigger a
	 * hot memory remove on s390. So there is nothing that needs to be
	 * implemented.
	 */
	return -EBUSY;
}
#endif
#endif /* CONFIG_MEMORY_HOTPLUG */
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	* S390 version
a53c8fab	3	* Copyright IBM Corp. 1999
1da177e4 LT	4	* Author(s): Hartmut Penner (hp@de.ibm.com)
	5	*
	6	* Derived from "arch/i386/mm/init.c"
	7	* Copyright (C) 1995 Linus Torvalds
	8	*/
	9
1da177e4 LT	10	#include <linux/signal.h>
	11	#include <linux/sched.h>
	12	#include <linux/kernel.h>
	13	#include <linux/errno.h>
	14	#include <linux/string.h>
	15	#include <linux/types.h>
	16	#include <linux/ptrace.h>
	17	#include <linux/mman.h>
	18	#include <linux/mm.h>
	19	#include <linux/swap.h>
	20	#include <linux/smp.h>
	21	#include <linux/init.h>
	22	#include <linux/pagemap.h>
	23	#include <linux/bootmem.h>
e5d709bb	24	#include <linux/memory.h>
d882b172	25	#include <linux/pfn.h>
028d9b3c	26	#include <linux/poison.h>
2b67fc46	27	#include <linux/initrd.h>
3a4c5d59	28	#include <linux/export.h>
5a0e3ad6	29	#include <linux/gfp.h>
1da177e4	30	#include <asm/processor.h>
1da177e4 LT	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>
a0616cde	39	#include <asm/ctl_reg.h>
e5d709bb	40	#include <asm/sclp.h>
1da177e4	41
1da177e4	42	pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
1485c5c8	43
238ec4ef	44	unsigned long empty_zero_page, zero_page_mask;
1485c5c8	45	EXPORT_SYMBOL(empty_zero_page);
1da177e4	46
0999f119	47	static void __init setup_zero_pages(void)
238ec4ef MS	48	{
	49	struct cpuid cpu_id;
	50	unsigned int order;
238ec4ef MS	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 */
7919e91b MS	67	case 0x2817: /* z196 */
7919e91b MS	68	case 0x2818: /* z196 */
238ec4ef MS	69	order = 2;
238ec4ef MS	70	break;
7919e91b MS	71	case 0x2827: /* zEC12 */
	72	default:
	73	order = 5;
	74	break;
238ec4ef	75	}
7919e91b MS	76	/* Limit number of empty zero pages for small memory sizes */
	77	if (order > 2 && totalram_pages <= 16384)
	78	order = 2;
238ec4ef MS	79
	80	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	81	if (!empty_zero_page)
	82	panic("Out of memory in setup_zero_pages");
	83
	84	page = virt_to_page((void *) empty_zero_page);
	85	split_page(page, order);
	86	for (i = 1 << order; i > 0; i--) {
0999f119	87	mark_page_reserved(page);
238ec4ef MS	88	page++;
	89	}
	90
0999f119	91	zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
238ec4ef MS	92	}
238ec4ef MS	93
1da177e4 LT	94	/*
	95	* paging_init() sets up the page tables
	96	*/
1da177e4 LT	97	void __init paging_init(void)
1da177e4 LT	98	{
39b742f9	99	unsigned long max_zone_pfns[MAX_NR_ZONES];
14045ebf	100	unsigned long pgd_type, asce_bits;
d882b172	101
3610cce8	102	init_mm.pgd = swapper_pg_dir;
f4eb07c1	103	#ifdef CONFIG_64BIT
14045ebf MS	104	if (VMALLOC_END > (1UL << 42)) {
	105	asce_bits = _ASCE_TYPE_REGION2 \| _ASCE_TABLE_LENGTH;
	106	pgd_type = _REGION2_ENTRY_EMPTY;
	107	} else {
	108	asce_bits = _ASCE_TYPE_REGION3 \| _ASCE_TABLE_LENGTH;
	109	pgd_type = _REGION3_ENTRY_EMPTY;
	110	}
f4eb07c1	111	#else
14045ebf	112	asce_bits = _ASCE_TABLE_LENGTH;
3610cce8	113	pgd_type = _SEGMENT_ENTRY_EMPTY;
f4eb07c1	114	#endif
14045ebf	115	S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) \| asce_bits;
3610cce8 MS	116	clear_table((unsigned long *) init_mm.pgd, pgd_type,
3610cce8 MS	117	sizeof(unsigned long)*2048);
f4eb07c1	118	vmem_map_init();
1da177e4	119
1da177e4	120	/* enable virtual mapping in kernel mode */
3610cce8 MS	121	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	122	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	123	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
df9ee292	124	arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
1da177e4	125
050eef36 MS	126	atomic_set(&init_mm.context.attach_count, 1);
050eef36 MS	127
17f34580 HC	128	sparse_memory_present_with_active_regions(MAX_NUMNODES);
17f34580 HC	129	sparse_init();
39b742f9 HC	130	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
	131	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
	132	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	133	free_area_init_nodes(max_zone_pfns);
1da177e4	134	}
1da177e4 LT	135
	136	void __init mem_init(void)
	137	{
a18d0e2d	138	max_mapnr = max_low_pfn;
1da177e4 LT	139	high_memory = (void ) __va(max_low_pfn PAGE_SIZE);
1da177e4 LT	140
45e576b1 MS	141	/* Setup guest page hinting */
	142	cmma_init();
	143
1da177e4	144	/* this will put all low memory onto the freelists */
0c988534	145	free_all_bootmem();
0999f119	146	setup_zero_pages(); /* Setup zeroed pages. */
1da177e4	147
a18d0e2d	148	mem_init_print_info(NULL);
d882b172	149	printk("Write protected kernel read-only data: %#lx - %#lx\n",
162e006e HC	150	(unsigned long)&_stext,
162e006e HC	151	PFN_ALIGN((unsigned long)&_eshared) - 1);
1da177e4 LT	152	}
1da177e4 LT	153
d96221ab HC	154	void free_initmem(void)
d96221ab HC	155	{
dbe67df4	156	free_initmem_default(POISON_FREE_INITMEM);
1da177e4 LT	157	}
	158
	159	#ifdef CONFIG_BLK_DEV_INITRD
5e249d6e	160	void __init free_initrd_mem(unsigned long start, unsigned long end)
1da177e4	161	{
11199692 JL	162	free_reserved_area((void )start, (void )end, POISON_FREE_INITMEM,
11199692 JL	163	"initrd");
1da177e4 LT	164	}
1da177e4 LT	165	#endif
421c175c HC	166
	167	#ifdef CONFIG_MEMORY_HOTPLUG
	168	int arch_add_memory(int nid, u64 start, u64 size)
	169	{
892365ab GS	170	unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
	171	unsigned long start_pfn = PFN_DOWN(start);
	172	unsigned long size_pages = PFN_DOWN(size);
421c175c HC	173	struct zone *zone;
	174	int rc;
	175
421c175c HC	176	rc = vmem_add_mapping(start, size);
	177	if (rc)
	178	return rc;
892365ab GS	179	for_each_zone(zone) {
	180	if (zone_idx(zone) != ZONE_MOVABLE) {
	181	/* Add range within existing zone limits */
	182	zone_start_pfn = zone->zone_start_pfn;
	183	zone_end_pfn = zone->zone_start_pfn +
	184	zone->spanned_pages;
	185	} else {
	186	/* Add remaining range to ZONE_MOVABLE */
	187	zone_start_pfn = start_pfn;
	188	zone_end_pfn = start_pfn + size_pages;
	189	}
	190	if (start_pfn < zone_start_pfn \|\| start_pfn >= zone_end_pfn)
	191	continue;
	192	nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
	193	zone_end_pfn - start_pfn : size_pages;
	194	rc = __add_pages(nid, zone, start_pfn, nr_pages);
	195	if (rc)
	196	break;
	197	start_pfn += nr_pages;
	198	size_pages -= nr_pages;
	199	if (!size_pages)
	200	break;
	201	}
421c175c HC	202	if (rc)
	203	vmem_remove_mapping(start, size);
	204	return rc;
	205	}
24d335ca	206
e5d709bb HC	207	unsigned long memory_block_size_bytes(void)
	208	{
	209	/*
	210	* Make sure the memory block size is always greater
	211	* or equal than the memory increment size.
	212	*/
	213	return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm());
	214	}
	215
24d335ca WC	216	#ifdef CONFIG_MEMORY_HOTREMOVE
	217	int arch_remove_memory(u64 start, u64 size)
	218	{
	219	/*
	220	* There is no hardware or firmware interface which could trigger a
	221	* hot memory remove on s390. So there is nothing that needs to be
	222	* implemented.
	223	*/
	224	return -EBUSY;
	225	}
	226	#endif
421c175c	227	#endif /* CONFIG_MEMORY_HOTPLUG */