[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/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>

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)
{
	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();
	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);
}

void free_initmem(void)
{
	free_initmem_default(0);
}

#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
	free_reserved_area(start, 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;
}

#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>
d882b172	24	#include <linux/pfn.h>
028d9b3c	25	#include <linux/poison.h>
2b67fc46	26	#include <linux/initrd.h>
3a4c5d59	27	#include <linux/export.h>
5a0e3ad6	28	#include <linux/gfp.h>
1da177e4	29	#include <asm/processor.h>
1da177e4 LT	30	#include <asm/uaccess.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/pgalloc.h>
	33	#include <asm/dma.h>
	34	#include <asm/lowcore.h>
	35	#include <asm/tlb.h>
	36	#include <asm/tlbflush.h>
d882b172	37	#include <asm/sections.h>
a0616cde	38	#include <asm/ctl_reg.h>
1da177e4	39
1da177e4	40	pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
1485c5c8	41
238ec4ef	42	unsigned long empty_zero_page, zero_page_mask;
1485c5c8	43	EXPORT_SYMBOL(empty_zero_page);
1da177e4	44
0999f119	45	static void __init setup_zero_pages(void)
238ec4ef MS	46	{
	47	struct cpuid cpu_id;
	48	unsigned int order;
238ec4ef MS	49	struct page *page;
	50	int i;
	51
	52	get_cpu_id(&cpu_id);
	53	switch (cpu_id.machine) {
	54	case 0x9672: /* g5 */
	55	case 0x2064: /* z900 */
	56	case 0x2066: /* z900 */
	57	case 0x2084: /* z990 */
	58	case 0x2086: /* z990 */
	59	case 0x2094: /* z9-109 */
	60	case 0x2096: /* z9-109 */
	61	order = 0;
	62	break;
	63	case 0x2097: /* z10 */
	64	case 0x2098: /* z10 */
7919e91b MS	65	case 0x2817: /* z196 */
7919e91b MS	66	case 0x2818: /* z196 */
238ec4ef MS	67	order = 2;
238ec4ef MS	68	break;
7919e91b MS	69	case 0x2827: /* zEC12 */
	70	default:
	71	order = 5;
	72	break;
238ec4ef	73	}
7919e91b MS	74	/* Limit number of empty zero pages for small memory sizes */
	75	if (order > 2 && totalram_pages <= 16384)
	76	order = 2;
238ec4ef MS	77
	78	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	79	if (!empty_zero_page)
	80	panic("Out of memory in setup_zero_pages");
	81
	82	page = virt_to_page((void *) empty_zero_page);
	83	split_page(page, order);
	84	for (i = 1 << order; i > 0; i--) {
0999f119	85	mark_page_reserved(page);
238ec4ef MS	86	page++;
	87	}
	88
0999f119	89	zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
238ec4ef MS	90	}
238ec4ef MS	91
1da177e4 LT	92	/*
	93	* paging_init() sets up the page tables
	94	*/
1da177e4 LT	95	void __init paging_init(void)
1da177e4 LT	96	{
39b742f9	97	unsigned long max_zone_pfns[MAX_NR_ZONES];
14045ebf	98	unsigned long pgd_type, asce_bits;
d882b172	99
3610cce8	100	init_mm.pgd = swapper_pg_dir;
f4eb07c1	101	#ifdef CONFIG_64BIT
14045ebf MS	102	if (VMALLOC_END > (1UL << 42)) {
	103	asce_bits = _ASCE_TYPE_REGION2 \| _ASCE_TABLE_LENGTH;
	104	pgd_type = _REGION2_ENTRY_EMPTY;
	105	} else {
	106	asce_bits = _ASCE_TYPE_REGION3 \| _ASCE_TABLE_LENGTH;
	107	pgd_type = _REGION3_ENTRY_EMPTY;
	108	}
f4eb07c1	109	#else
14045ebf	110	asce_bits = _ASCE_TABLE_LENGTH;
3610cce8	111	pgd_type = _SEGMENT_ENTRY_EMPTY;
f4eb07c1	112	#endif
14045ebf	113	S390_lowcore.kernel_asce = (__pa(init_mm.pgd) & PAGE_MASK) \| asce_bits;
3610cce8 MS	114	clear_table((unsigned long *) init_mm.pgd, pgd_type,
3610cce8 MS	115	sizeof(unsigned long)*2048);
f4eb07c1	116	vmem_map_init();
1da177e4	117
1da177e4	118	/* enable virtual mapping in kernel mode */
3610cce8 MS	119	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	120	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	121	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
df9ee292	122	arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
1da177e4	123
050eef36 MS	124	atomic_set(&init_mm.context.attach_count, 1);
050eef36 MS	125
17f34580 HC	126	sparse_memory_present_with_active_regions(MAX_NUMNODES);
17f34580 HC	127	sparse_init();
39b742f9 HC	128	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
	129	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
	130	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	131	free_area_init_nodes(max_zone_pfns);
1da177e4	132	}
1da177e4 LT	133
	134	void __init mem_init(void)
	135	{
	136	unsigned long codesize, reservedpages, datasize, initsize;
	137
	138	max_mapnr = num_physpages = max_low_pfn;
	139	high_memory = (void ) __va(max_low_pfn PAGE_SIZE);
	140
45e576b1 MS	141	/* Setup guest page hinting */
	142	cmma_init();
	143
1da177e4 LT	144	/* this will put all low memory onto the freelists */
1da177e4 LT	145	totalram_pages += free_all_bootmem();
0999f119	146	setup_zero_pages(); /* Setup zeroed pages. */
1da177e4 LT	147
	148	reservedpages = 0;
	149
	150	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	151	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	152	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	153	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
cc013a88	154	nr_free_pages() << (PAGE_SHIFT-10),
1da177e4 LT	155	max_mapnr << (PAGE_SHIFT-10),
	156	codesize >> 10,
	157	reservedpages << (PAGE_SHIFT-10),
	158	datasize >>10,
	159	initsize >> 10);
d882b172	160	printk("Write protected kernel read-only data: %#lx - %#lx\n",
162e006e HC	161	(unsigned long)&_stext,
162e006e HC	162	PFN_ALIGN((unsigned long)&_eshared) - 1);
1da177e4 LT	163	}
1da177e4 LT	164
d96221ab HC	165	void free_initmem(void)
d96221ab HC	166	{
0999f119	167	free_initmem_default(0);
1da177e4 LT	168	}
	169
	170	#ifdef CONFIG_BLK_DEV_INITRD
5e249d6e	171	void __init free_initrd_mem(unsigned long start, unsigned long end)
1da177e4	172	{
0999f119	173	free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
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	{
892365ab GS	180	unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
	181	unsigned long start_pfn = PFN_DOWN(start);
	182	unsigned long size_pages = PFN_DOWN(size);
421c175c HC	183	struct zone *zone;
	184	int rc;
	185
421c175c HC	186	rc = vmem_add_mapping(start, size);
	187	if (rc)
	188	return rc;
892365ab GS	189	for_each_zone(zone) {
	190	if (zone_idx(zone) != ZONE_MOVABLE) {
	191	/* Add range within existing zone limits */
	192	zone_start_pfn = zone->zone_start_pfn;
	193	zone_end_pfn = zone->zone_start_pfn +
	194	zone->spanned_pages;
	195	} else {
	196	/* Add remaining range to ZONE_MOVABLE */
	197	zone_start_pfn = start_pfn;
	198	zone_end_pfn = start_pfn + size_pages;
	199	}
	200	if (start_pfn < zone_start_pfn \|\| start_pfn >= zone_end_pfn)
	201	continue;
	202	nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
	203	zone_end_pfn - start_pfn : size_pages;
	204	rc = __add_pages(nid, zone, start_pfn, nr_pages);
	205	if (rc)
	206	break;
	207	start_pfn += nr_pages;
	208	size_pages -= nr_pages;
	209	if (!size_pages)
	210	break;
	211	}
421c175c HC	212	if (rc)
	213	vmem_remove_mapping(start, size);
	214	return rc;
	215	}
24d335ca WC	216
	217	#ifdef CONFIG_MEMORY_HOTREMOVE
	218	int arch_remove_memory(u64 start, u64 size)
	219	{
	220	/*
	221	* There is no hardware or firmware interface which could trigger a
	222	* hot memory remove on s390. So there is nothing that needs to be
	223	* implemented.
	224	*/
	225	return -EBUSY;
	226	}
	227	#endif
421c175c	228	#endif /* CONFIG_MEMORY_HOTPLUG */