[GitHub/mt8127/android_kernel_alcatel_ttab.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)));

void show_mem(void)
{
	unsigned long i, total = 0, reserved = 0;
	unsigned long shared = 0, cached = 0;
	unsigned long flags;
	struct page *page;
	pg_data_t *pgdat;

	printk("Mem-info:\n");
	show_free_areas();
	for_each_online_pgdat(pgdat) {
		pgdat_resize_lock(pgdat, &flags);
		for (i = 0; i < pgdat->node_spanned_pages; i++) {
			if (!pfn_valid(pgdat->node_start_pfn + i))
				continue;
			page = pfn_to_page(pgdat->node_start_pfn + i);
			total++;
			if (PageReserved(page))
				reserved++;
			else if (PageSwapCache(page))
				cached++;
			else if (page_count(page))
				shared += page_count(page) - 1;
		}
		pgdat_resize_unlock(pgdat, &flags);
	}
	printk("%ld pages of RAM\n", total);
	printk("%ld reserved pages\n", reserved);
	printk("%ld pages shared\n", shared);
	printk("%ld pages swap cached\n", cached);
}

/*
 * 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",
                (unsigned long) 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_initmem(void)
{
        unsigned long addr;

        addr = (unsigned long)(&__init_begin);
        for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
		free_page(addr);
		totalram_pages++;
        }
        printk ("Freeing unused kernel memory: %ldk freed\n",
		((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
        if (start < end)
                printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
        for (; start < end; start += PAGE_SIZE) {
                ClearPageReserved(virt_to_page(start));
                init_page_count(virt_to_page(start));
                free_page(start);
                totalram_pages++;
        }
}
#endif
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)));
	43	char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
	44
1da177e4 LT	45	void show_mem(void)
1da177e4 LT	46	{
c1bb7f31 HC	47	unsigned long i, total = 0, reserved = 0;
	48	unsigned long shared = 0, cached = 0;
	49	unsigned long flags;
0b2b6e1d	50	struct page *page;
c1bb7f31	51	pg_data_t *pgdat;
1da177e4	52
be2864b5 HC	53	printk("Mem-info:\n");
be2864b5 HC	54	show_free_areas();
c1bb7f31 HC	55	for_each_online_pgdat(pgdat) {
	56	pgdat_resize_lock(pgdat, &flags);
	57	for (i = 0; i < pgdat->node_spanned_pages; i++) {
	58	if (!pfn_valid(pgdat->node_start_pfn + i))
	59	continue;
	60	page = pfn_to_page(pgdat->node_start_pfn + i);
	61	total++;
	62	if (PageReserved(page))
	63	reserved++;
	64	else if (PageSwapCache(page))
	65	cached++;
	66	else if (page_count(page))
	67	shared += page_count(page) - 1;
	68	}
	69	pgdat_resize_unlock(pgdat, &flags);
be2864b5	70	}
c1bb7f31 HC	71	printk("%ld pages of RAM\n", total);
	72	printk("%ld reserved pages\n", reserved);
	73	printk("%ld pages shared\n", shared);
	74	printk("%ld pages swap cached\n", cached);
1da177e4 LT	75	}
1da177e4 LT	76
1da177e4 LT	77	/*
	78	* paging_init() sets up the page tables
	79	*/
1da177e4 LT	80	void __init paging_init(void)
1da177e4 LT	81	{
f4eb07c1	82	static const int ssm_mask = 0x04000000L;
39b742f9	83	unsigned long max_zone_pfns[MAX_NR_ZONES];
3610cce8	84	unsigned long pgd_type;
d882b172	85
3610cce8 MS	86	init_mm.pgd = swapper_pg_dir;
3610cce8 MS	87	S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
f4eb07c1	88	#ifdef CONFIG_64BIT
6252d702 MS	89	/* A three level page table (4TB) is enough for the kernel space. */
	90	S390_lowcore.kernel_asce \|= _ASCE_TYPE_REGION3 \| _ASCE_TABLE_LENGTH;
	91	pgd_type = _REGION3_ENTRY_EMPTY;
f4eb07c1	92	#else
3610cce8 MS	93	S390_lowcore.kernel_asce \|= _ASCE_TABLE_LENGTH;
3610cce8 MS	94	pgd_type = _SEGMENT_ENTRY_EMPTY;
f4eb07c1	95	#endif
3610cce8 MS	96	clear_table((unsigned long *) init_mm.pgd, pgd_type,
3610cce8 MS	97	sizeof(unsigned long)*2048);
f4eb07c1	98	vmem_map_init();
1da177e4	99
1da177e4	100	/* enable virtual mapping in kernel mode */
3610cce8 MS	101	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	102	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	103	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
94c12cc7	104	__raw_local_irq_ssm(ssm_mask);
1da177e4	105
17f34580 HC	106	sparse_memory_present_with_active_regions(MAX_NUMNODES);
17f34580 HC	107	sparse_init();
39b742f9	108	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
118bcd31	109	#ifdef CONFIG_ZONE_DMA
39b742f9	110	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
118bcd31	111	#endif
39b742f9 HC	112	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
39b742f9 HC	113	free_area_init_nodes(max_zone_pfns);
1da177e4	114	}
1da177e4 LT	115
	116	void __init mem_init(void)
	117	{
	118	unsigned long codesize, reservedpages, datasize, initsize;
	119
	120	max_mapnr = num_physpages = max_low_pfn;
	121	high_memory = (void ) __va(max_low_pfn PAGE_SIZE);
	122
	123	/* clear the zero-page */
	124	memset(empty_zero_page, 0, PAGE_SIZE);
	125
45e576b1 MS	126	/* Setup guest page hinting */
	127	cmma_init();
	128
1da177e4 LT	129	/* this will put all low memory onto the freelists */
	130	totalram_pages += free_all_bootmem();
	131
	132	reservedpages = 0;
	133
	134	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	135	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	136	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	137	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
	138	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	139	max_mapnr << (PAGE_SHIFT-10),
	140	codesize >> 10,
	141	reservedpages << (PAGE_SHIFT-10),
	142	datasize >>10,
	143	initsize >> 10);
d882b172	144	printk("Write protected kernel read-only data: %#lx - %#lx\n",
162e006e HC	145	(unsigned long)&_stext,
162e006e HC	146	PFN_ALIGN((unsigned long)&_eshared) - 1);
1da177e4 LT	147	}
1da177e4 LT	148
2485579b HC	149	#ifdef CONFIG_DEBUG_PAGEALLOC
	150	void kernel_map_pages(struct page *page, int numpages, int enable)
	151	{
	152	pgd_t *pgd;
	153	pud_t *pud;
	154	pmd_t *pmd;
	155	pte_t *pte;
	156	unsigned long address;
	157	int i;
	158
	159	for (i = 0; i < numpages; i++) {
	160	address = page_to_phys(page + i);
	161	pgd = pgd_offset_k(address);
	162	pud = pud_offset(pgd, address);
	163	pmd = pmd_offset(pud, address);
	164	pte = pte_offset_kernel(pmd, address);
	165	if (!enable) {
146e4b3c	166	ptep_invalidate(&init_mm, address, pte);
2485579b HC	167	continue;
	168	}
	169	*pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
	170	/* Flush cpu write queue. */
	171	mb();
	172	}
	173	}
	174	#endif
	175
1da177e4 LT	176	void free_initmem(void)
	177	{
	178	unsigned long addr;
	179
	180	addr = (unsigned long)(&__init_begin);
	181	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
	182	ClearPageReserved(virt_to_page(addr));
7835e98b	183	init_page_count(virt_to_page(addr));
028d9b3c	184	memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
1da177e4 LT	185	free_page(addr);
	186	totalram_pages++;
	187	}
	188	printk ("Freeing unused kernel memory: %ldk freed\n",
	189	((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
	190	}
	191
	192	#ifdef CONFIG_BLK_DEV_INITRD
	193	void free_initrd_mem(unsigned long start, unsigned long end)
	194	{
	195	if (start < end)
	196	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
	197	for (; start < end; start += PAGE_SIZE) {
	198	ClearPageReserved(virt_to_page(start));
7835e98b	199	init_page_count(virt_to_page(start));
1da177e4 LT	200	free_page(start);
	201	totalram_pages++;
	202	}
	203	}
	204	#endif