[linux-block.git] / arch / microblaze / mm / init.c

/*
 * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/dma-map-ops.h>
#include <linux/memblock.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h> /* mem_init */
#include <linux/initrd.h>
#include <linux/of_fdt.h>
#include <linux/pagemap.h>
#include <linux/pfn.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/export.h>

#include <asm/page.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>
#include <asm/tlb.h>
#include <asm/fixmap.h>

/* Use for MMU and noMMU because of PCI generic code */
int mem_init_done;

char *klimit = _end;

/*
 * Initialize the bootmem system and give it all the memory we
 * have available.
 */
unsigned long memory_start;
EXPORT_SYMBOL(memory_start);
unsigned long memory_size;
EXPORT_SYMBOL(memory_size);
unsigned long lowmem_size;

EXPORT_SYMBOL(min_low_pfn);
EXPORT_SYMBOL(max_low_pfn);

#ifdef CONFIG_HIGHMEM
static void __init highmem_init(void)
{
	pr_debug("%x\n", (u32)PKMAP_BASE);
	map_page(PKMAP_BASE, 0, 0);	/* XXX gross */
	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
}
#endif /* CONFIG_HIGHMEM */

/*
 * paging_init() sets up the page tables - in fact we've already done this.
 */
static void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES];
	int idx;

	/* Setup fixmaps */
	for (idx = 0; idx < __end_of_fixed_addresses; idx++)
		clear_fixmap(idx);

	/* Clean every zones */
	memset(zones_size, 0, sizeof(zones_size));

#ifdef CONFIG_HIGHMEM
	highmem_init();

	zones_size[ZONE_DMA] = max_low_pfn;
	zones_size[ZONE_HIGHMEM] = max_pfn;
#else
	zones_size[ZONE_DMA] = max_pfn;
#endif

	/* We don't have holes in memory map */
	free_area_init(zones_size);
}

void __init setup_memory(void)
{
	/*
	 * Kernel:
	 * start: base phys address of kernel - page align
	 * end: base phys address of kernel - page align
	 *
	 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	 * max_low_pfn
	 */

	/* memory start is from the kernel end (aligned) to higher addr */
	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
	max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
	max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;

	pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
	pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);

	paging_init();
}

void __init mem_init(void)
{
	mem_init_done = 1;
}

int page_is_ram(unsigned long pfn)
{
	return pfn < max_low_pfn;
}

/*
 * Check for command-line options that affect what MMU_init will do.
 */
static void __init mm_cmdline_setup(void)
{
	unsigned long maxmem = 0;
	char *p = cmd_line;

	/* Look for mem= option on command line */
	p = strstr(cmd_line, "mem=");
	if (p) {
		p += 4;
		maxmem = memparse(p, &p);
		if (maxmem && memory_size > maxmem) {
			memory_size = maxmem;
			memblock.memory.regions[0].size = memory_size;
		}
	}
}

/*
 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
 */
static void __init mmu_init_hw(void)
{
	/*
	 * The Zone Protection Register (ZPR) defines how protection will
	 * be applied to every page which is a member of a given zone. At
	 * present, we utilize only two of the zones.
	 * The zone index bits (of ZSEL) in the PTE are used for software
	 * indicators, except the LSB.  For user access, zone 1 is used,
	 * for kernel access, zone 0 is used.  We set all but zone 1
	 * to zero, allowing only kernel access as indicated in the PTE.
	 * For zone 1, we set a 01 binary (a value of 10 will not work)
	 * to allow user access as indicated in the PTE.  This also allows
	 * kernel access as indicated in the PTE.
	 */
	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
			"mts rzpr, r11;"
			: : : "r11");
}

/*
 * MMU_init sets up the basic memory mappings for the kernel,
 * including both RAM and possibly some I/O regions,
 * and sets up the page tables and the MMU hardware ready to go.
 */

/* called from head.S */
asmlinkage void __init mmu_init(void)
{
	unsigned int kstart, ksize;

	if ((u32) memblock.memory.regions[0].size < 0x400000) {
		pr_emerg("Memory must be greater than 4MB\n");
		machine_restart(NULL);
	}

	if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
		pr_emerg("Kernel size is greater than memory node\n");
		machine_restart(NULL);
	}

	/* Find main memory where the kernel is */
	memory_start = (u32) memblock.memory.regions[0].base;
	lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;

	if (lowmem_size > CONFIG_LOWMEM_SIZE) {
		lowmem_size = CONFIG_LOWMEM_SIZE;
#ifndef CONFIG_HIGHMEM
		memory_size = lowmem_size;
#endif
	}

	mm_cmdline_setup(); /* FIXME parse args from command line - not used */

	/*
	 * Map out the kernel text/data/bss from the available physical
	 * memory.
	 */
	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
	/* kernel size */
	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
	memblock_reserve(kstart, ksize);

#if defined(CONFIG_BLK_DEV_INITRD)
	/* Remove the init RAM disk from the available memory. */
	if (initrd_start) {
		unsigned long size;
		size = initrd_end - initrd_start;
		memblock_reserve(__virt_to_phys(initrd_start), size);
	}
#endif /* CONFIG_BLK_DEV_INITRD */

	/* Initialize the MMU hardware */
	mmu_init_hw();

	/* Map in all of RAM starting at CONFIG_KERNEL_START */
	mapin_ram();

	/* Extend vmalloc and ioremap area as big as possible */
#ifdef CONFIG_HIGHMEM
	ioremap_base = ioremap_bot = PKMAP_BASE;
#else
	ioremap_base = ioremap_bot = FIXADDR_START;
#endif

	/* Initialize the context management stuff */
	mmu_context_init();

	/* Shortly after that, the entire linear mapping will be available */
	/* This will also cause that unflatten device tree will be allocated
	 * inside 768MB limit */
	memblock_set_current_limit(memory_start + lowmem_size - 1);

	parse_early_param();

	early_init_fdt_scan_reserved_mem();

	/* CMA initialization */
	dma_contiguous_reserve(memory_start + lowmem_size - 1);

	memblock_dump_all();
}

static const pgprot_t protection_map[16] = {
	[VM_NONE]					= PAGE_NONE,
	[VM_READ]					= PAGE_READONLY_X,
	[VM_WRITE]					= PAGE_COPY,
	[VM_WRITE | VM_READ]				= PAGE_COPY_X,
	[VM_EXEC]					= PAGE_READONLY,
	[VM_EXEC | VM_READ]				= PAGE_READONLY_X,
	[VM_EXEC | VM_WRITE]				= PAGE_COPY,
	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_COPY_X,
	[VM_SHARED]					= PAGE_NONE,
	[VM_SHARED | VM_READ]				= PAGE_READONLY_X,
	[VM_SHARED | VM_WRITE]				= PAGE_SHARED,
	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_SHARED_X,
	[VM_SHARED | VM_EXEC]				= PAGE_READONLY,
	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_READONLY_X,
	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_SHARED,
	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_SHARED_X
};
DECLARE_VM_GET_PAGE_PROT
Commit	Line	Data
a95d0e16 MS	1	/*
	2	* Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
	3	* Copyright (C) 2006 Atmark Techno, Inc.
	4	*
	5	* This file is subject to the terms and conditions of the GNU General Public
	6	* License. See the file "COPYING" in the main directory of this archive
	7	* for more details.
	8	*/
	9
0b1abd1f	10	#include <linux/dma-map-ops.h>
57c8a661	11	#include <linux/memblock.h>
a95d0e16 MS	12	#include <linux/init.h>
a95d0e16 MS	13	#include <linux/kernel.h>
a95d0e16 MS	14	#include <linux/mm.h> /* mem_init */
a95d0e16 MS	15	#include <linux/initrd.h>
68cbfae8	16	#include <linux/of_fdt.h>
a95d0e16 MS	17	#include <linux/pagemap.h>
a95d0e16 MS	18	#include <linux/pfn.h>
5a0e3ad6	19	#include <linux/slab.h>
a95d0e16	20	#include <linux/swap.h>
66421a64	21	#include <linux/export.h>
a95d0e16 MS	22
	23	#include <asm/page.h>
	24	#include <asm/mmu_context.h>
	25	#include <asm/pgalloc.h>
	26	#include <asm/sections.h>
	27	#include <asm/tlb.h>
41938761	28	#include <asm/fixmap.h>
a95d0e16	29
79bf3a13 MS	30	/* Use for MMU and noMMU because of PCI generic code */
	31	int mem_init_done;
	32
a95d0e16 MS	33	char *klimit = _end;
	34
	35	/*
	36	* Initialize the bootmem system and give it all the memory we
	37	* have available.
	38	*/
4dc60832	39	unsigned long memory_start;
fd6ed51f	40	EXPORT_SYMBOL(memory_start);
4dc60832	41	unsigned long memory_size;
ee4bcdf1	42	EXPORT_SYMBOL(memory_size);
83a92529	43	unsigned long lowmem_size;
a95d0e16	44
08134e79 RD	45	EXPORT_SYMBOL(min_low_pfn);
	46	EXPORT_SYMBOL(max_low_pfn);
	47
a0e16997	48	#ifdef CONFIG_HIGHMEM
2f2f371f MS	49	static void __init highmem_init(void)
	50	{
	51	pr_debug("%x\n", (u32)PKMAP_BASE);
	52	map_page(PKMAP_BASE, 0, 0); /* XXX gross */
	53	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
2f2f371f	54	}
2f2f371f MS	55	#endif /* CONFIG_HIGHMEM */
2f2f371f MS	56
a95d0e16 MS	57	/*
	58	* paging_init() sets up the page tables - in fact we've already done this.
	59	*/
	60	static void __init paging_init(void)
	61	{
a95d0e16	62	unsigned long zones_size[MAX_NR_ZONES];
41938761 MS	63	int idx;
	64
	65	/* Setup fixmaps */
	66	for (idx = 0; idx < __end_of_fixed_addresses; idx++)
	67	clear_fixmap(idx);
a95d0e16	68
5af90438 SM	69	/* Clean every zones */
	70	memset(zones_size, 0, sizeof(zones_size));
	71
2f2f371f MS	72	#ifdef CONFIG_HIGHMEM
	73	highmem_init();
	74
	75	zones_size[ZONE_DMA] = max_low_pfn;
	76	zones_size[ZONE_HIGHMEM] = max_pfn;
	77	#else
83a92529	78	zones_size[ZONE_DMA] = max_pfn;
2f2f371f	79	#endif
a95d0e16	80
baab8a82	81	/* We don't have holes in memory map */
9691a071	82	free_area_init(zones_size);
a95d0e16 MS	83	}
	84
	85	void __init setup_memory(void)
	86	{
a95d0e16 MS	87	/*
	88	* Kernel:
	89	* start: base phys address of kernel - page align
	90	* end: base phys address of kernel - page align
	91	*
	92	* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
	93	* max_low_pfn
a95d0e16 MS	94	*/
	95
	96	/* memory start is from the kernel end (aligned) to higher addr */
	97	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
83a92529 MS	98	max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
83a92529 MS	99	max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
a95d0e16	100
6bd55f0b MS	101	pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
	102	pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
	103	pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);
a95d0e16	104
a95d0e16 MS	105	paging_init();
	106	}
	107
a95d0e16 MS	108	void __init mem_init(void)
a95d0e16 MS	109	{
4dc60832	110	mem_init_done = 1;
a95d0e16 MS	111	}
a95d0e16 MS	112
4dc60832 MS	113	int page_is_ram(unsigned long pfn)
	114	{
	115	return pfn < max_low_pfn;
	116	}
	117
	118	/*
	119	* Check for command-line options that affect what MMU_init will do.
	120	*/
1b3d3e9f	121	static void __init mm_cmdline_setup(void)
4dc60832 MS	122	{
	123	unsigned long maxmem = 0;
	124	char *p = cmd_line;
	125
	126	/* Look for mem= option on command line */
	127	p = strstr(cmd_line, "mem=");
	128	if (p) {
	129	p += 4;
	130	maxmem = memparse(p, &p);
	131	if (maxmem && memory_size > maxmem) {
	132	memory_size = maxmem;
da5ab11c	133	memblock.memory.regions[0].size = memory_size;
4dc60832 MS	134	}
	135	}
	136	}
	137
	138	/*
	139	* MMU_init_hw does the chip-specific initialization of the MMU hardware.
	140	*/
	141	static void __init mmu_init_hw(void)
	142	{
	143	/*
	144	* The Zone Protection Register (ZPR) defines how protection will
	145	* be applied to every page which is a member of a given zone. At
	146	* present, we utilize only two of the zones.
	147	* The zone index bits (of ZSEL) in the PTE are used for software
	148	* indicators, except the LSB. For user access, zone 1 is used,
	149	* for kernel access, zone 0 is used. We set all but zone 1
	150	* to zero, allowing only kernel access as indicated in the PTE.
	151	* For zone 1, we set a 01 binary (a value of 10 will not work)
	152	* to allow user access as indicated in the PTE. This also allows
	153	* kernel access as indicated in the PTE.
	154	*/
	155	__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
	156	"mts rzpr, r11;"
	157	: : : "r11");
	158	}
	159
	160	/*
	161	* MMU_init sets up the basic memory mappings for the kernel,
	162	* including both RAM and possibly some I/O regions,
	163	* and sets up the page tables and the MMU hardware ready to go.
	164	*/
	165
	166	/* called from head.S */
	167	asmlinkage void __init mmu_init(void)
	168	{
	169	unsigned int kstart, ksize;
	170
95b0f9ea	171	if ((u32) memblock.memory.regions[0].size < 0x400000) {
6bd55f0b	172	pr_emerg("Memory must be greater than 4MB\n");
4dc60832 MS	173	machine_restart(NULL);
4dc60832 MS	174	}
95b0f9ea MS	175
95b0f9ea MS	176	if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
6bd55f0b	177	pr_emerg("Kernel size is greater than memory node\n");
95b0f9ea MS	178	machine_restart(NULL);
	179	}
	180
4dc60832	181	/* Find main memory where the kernel is */
da5ab11c	182	memory_start = (u32) memblock.memory.regions[0].base;
83a92529 MS	183	lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
	184
	185	if (lowmem_size > CONFIG_LOWMEM_SIZE) {
	186	lowmem_size = CONFIG_LOWMEM_SIZE;
2f2f371f	187	#ifndef CONFIG_HIGHMEM
83a92529	188	memory_size = lowmem_size;
2f2f371f	189	#endif
83a92529	190	}
4dc60832 MS	191
	192	mm_cmdline_setup(); /* FIXME parse args from command line - not used */
	193
	194	/*
	195	* Map out the kernel text/data/bss from the available physical
	196	* memory.
	197	*/
	198	kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
	199	/* kernel size */
	200	ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
95f72d1e	201	memblock_reserve(kstart, ksize);
4dc60832 MS	202
	203	#if defined(CONFIG_BLK_DEV_INITRD)
	204	/* Remove the init RAM disk from the available memory. */
5eec2f02 MS	205	if (initrd_start) {
	206	unsigned long size;
	207	size = initrd_end - initrd_start;
a66a6265	208	memblock_reserve(__virt_to_phys(initrd_start), size);
5eec2f02	209	}
4dc60832 MS	210	#endif /* CONFIG_BLK_DEV_INITRD */
	211
	212	/* Initialize the MMU hardware */
	213	mmu_init_hw();
	214
	215	/* Map in all of RAM starting at CONFIG_KERNEL_START */
	216	mapin_ram();
	217
41938761	218	/* Extend vmalloc and ioremap area as big as possible */
2f2f371f MS	219	#ifdef CONFIG_HIGHMEM
	220	ioremap_base = ioremap_bot = PKMAP_BASE;
	221	#else
41938761	222	ioremap_base = ioremap_bot = FIXADDR_START;
2f2f371f	223	#endif
41938761	224
4dc60832 MS	225	/* Initialize the context management stuff */
4dc60832 MS	226	mmu_context_init();
83a92529 MS	227
	228	/* Shortly after that, the entire linear mapping will be available */
	229	/* This will also cause that unflatten device tree will be allocated
	230	* inside 768MB limit */
	231	memblock_set_current_limit(memory_start + lowmem_size - 1);
2602276d	232
dcf639fe MS	233	parse_early_param();
dcf639fe MS	234
68cbfae8 MS	235	early_init_fdt_scan_reserved_mem();
68cbfae8 MS	236
2602276d MS	237	/* CMA initialization */
2602276d MS	238	dma_contiguous_reserve(memory_start + lowmem_size - 1);
e4c70fc6 MS	239
e4c70fc6 MS	240	memblock_dump_all();
4dc60832 MS	241	}
4dc60832 MS	242
fa3f9f4a AK	243	static const pgprot_t protection_map[16] = {
	244	[VM_NONE] = PAGE_NONE,
	245	[VM_READ] = PAGE_READONLY_X,
	246	[VM_WRITE] = PAGE_COPY,
	247	[VM_WRITE \| VM_READ] = PAGE_COPY_X,
	248	[VM_EXEC] = PAGE_READONLY,
	249	[VM_EXEC \| VM_READ] = PAGE_READONLY_X,
	250	[VM_EXEC \| VM_WRITE] = PAGE_COPY,
	251	[VM_EXEC \| VM_WRITE \| VM_READ] = PAGE_COPY_X,
	252	[VM_SHARED] = PAGE_NONE,
	253	[VM_SHARED \| VM_READ] = PAGE_READONLY_X,
	254	[VM_SHARED \| VM_WRITE] = PAGE_SHARED,
	255	[VM_SHARED \| VM_WRITE \| VM_READ] = PAGE_SHARED_X,
	256	[VM_SHARED \| VM_EXEC] = PAGE_READONLY,
	257	[VM_SHARED \| VM_EXEC \| VM_READ] = PAGE_READONLY_X,
	258	[VM_SHARED \| VM_EXEC \| VM_WRITE] = PAGE_SHARED,
	259	[VM_SHARED \| VM_EXEC \| VM_WRITE \| VM_READ] = PAGE_SHARED_X
	260	};
	261	DECLARE_VM_GET_PAGE_PROT