[linux-2.6-block.git] / arch / x86 / mm / init.c

#include <linux/ioport.h>
#include <linux/swap.h>

#include <asm/cacheflush.h>
#include <asm/e820.h>
#include <asm/page.h>
#include <asm/page_types.h>
#include <asm/sections.h>
#include <asm/system.h>
#include <asm/tlbflush.h>

#ifdef CONFIG_X86_32
extern void __init early_ioremap_page_table_range_init(void);
extern void __init kernel_physical_mapping_init(unsigned long start_pfn,
						unsigned long end_pfn,
						int use_pse);
#endif

#ifdef CONFIG_X86_64
extern unsigned long __meminit
kernel_physical_mapping_init(unsigned long start,
			     unsigned long end,
			     unsigned long page_size_mask);
#endif

unsigned long __initdata table_start;
unsigned long __meminitdata table_end;
unsigned long __meminitdata table_top;

int after_bootmem;

int direct_gbpages
#ifdef CONFIG_DIRECT_GBPAGES
				= 1
#endif
;

static void __init find_early_table_space(unsigned long end, int use_pse,
					  int use_gbpages)
{
	unsigned long puds, pmds, ptes, tables, start;

	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
	tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);

	if (use_gbpages) {
		unsigned long extra;

		extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
		pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
	} else
		pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;

	tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);

	if (use_pse) {
		unsigned long extra;

		extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
#ifdef CONFIG_X86_32
		extra += PMD_SIZE;
#endif
		ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
	} else
		ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;

	tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);

#ifdef CONFIG_X86_32
	/* for fixmap */
	tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
#endif

	/*
	 * RED-PEN putting page tables only on node 0 could
	 * cause a hotspot and fill up ZONE_DMA. The page tables
	 * need roughly 0.5KB per GB.
	 */
#ifdef CONFIG_X86_32
	start = 0x7000;
	table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
					tables, PAGE_SIZE);
#else /* CONFIG_X86_64 */
	start = 0x8000;
	table_start = find_e820_area(start, end, tables, PAGE_SIZE);
#endif
	if (table_start == -1UL)
		panic("Cannot find space for the kernel page tables");

	table_start >>= PAGE_SHIFT;
	table_end = table_start;
	table_top = table_start + (tables >> PAGE_SHIFT);

	printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
		end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT);
}

struct map_range {
	unsigned long start;
	unsigned long end;
	unsigned page_size_mask;
};

#ifdef CONFIG_X86_32
#define NR_RANGE_MR 3
#else /* CONFIG_X86_64 */
#define NR_RANGE_MR 5
#endif

static int save_mr(struct map_range *mr, int nr_range,
		   unsigned long start_pfn, unsigned long end_pfn,
		   unsigned long page_size_mask)
{
	if (start_pfn < end_pfn) {
		if (nr_range >= NR_RANGE_MR)
			panic("run out of range for init_memory_mapping\n");
		mr[nr_range].start = start_pfn<<PAGE_SHIFT;
		mr[nr_range].end   = end_pfn<<PAGE_SHIFT;
		mr[nr_range].page_size_mask = page_size_mask;
		nr_range++;
	}

	return nr_range;
}

#ifdef CONFIG_X86_64
static void __init init_gbpages(void)
{
	if (direct_gbpages && cpu_has_gbpages)
		printk(KERN_INFO "Using GB pages for direct mapping\n");
	else
		direct_gbpages = 0;
}
#else
static inline void init_gbpages(void)
{
}
#endif

/*
 * Setup the direct mapping of the physical memory at PAGE_OFFSET.
 * This runs before bootmem is initialized and gets pages directly from
 * the physical memory. To access them they are temporarily mapped.
 */
unsigned long __init_refok init_memory_mapping(unsigned long start,
					       unsigned long end)
{
	unsigned long page_size_mask = 0;
	unsigned long start_pfn, end_pfn;
	unsigned long pos;
	unsigned long ret;

	struct map_range mr[NR_RANGE_MR];
	int nr_range, i;
	int use_pse, use_gbpages;

	printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);

	if (!after_bootmem)
		init_gbpages();

#ifdef CONFIG_DEBUG_PAGEALLOC
	/*
	 * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
	 * This will simplify cpa(), which otherwise needs to support splitting
	 * large pages into small in interrupt context, etc.
	 */
	use_pse = use_gbpages = 0;
#else
	use_pse = cpu_has_pse;
	use_gbpages = direct_gbpages;
#endif

#ifdef CONFIG_X86_32
#ifdef CONFIG_X86_PAE
	set_nx();
	if (nx_enabled)
		printk(KERN_INFO "NX (Execute Disable) protection: active\n");
#endif

	/* Enable PSE if available */
	if (cpu_has_pse)
		set_in_cr4(X86_CR4_PSE);

	/* Enable PGE if available */
	if (cpu_has_pge) {
		set_in_cr4(X86_CR4_PGE);
		__supported_pte_mask |= _PAGE_GLOBAL;
	}
#endif

	if (use_gbpages)
		page_size_mask |= 1 << PG_LEVEL_1G;
	if (use_pse)
		page_size_mask |= 1 << PG_LEVEL_2M;

	memset(mr, 0, sizeof(mr));
	nr_range = 0;

	/* head if not big page alignment ? */
	start_pfn = start >> PAGE_SHIFT;
	pos = start_pfn << PAGE_SHIFT;
#ifdef CONFIG_X86_32
	/*
	 * Don't use a large page for the first 2/4MB of memory
	 * because there are often fixed size MTRRs in there
	 * and overlapping MTRRs into large pages can cause
	 * slowdowns.
	 */
	if (pos == 0)
		end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
	else
		end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
				 << (PMD_SHIFT - PAGE_SHIFT);
#else /* CONFIG_X86_64 */
	end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
			<< (PMD_SHIFT - PAGE_SHIFT);
#endif
	if (end_pfn > (end >> PAGE_SHIFT))
		end_pfn = end >> PAGE_SHIFT;
	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
		pos = end_pfn << PAGE_SHIFT;
	}

	/* big page (2M) range */
	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
			 << (PMD_SHIFT - PAGE_SHIFT);
#ifdef CONFIG_X86_32
	end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
#else /* CONFIG_X86_64 */
	end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
			 << (PUD_SHIFT - PAGE_SHIFT);
	if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
		end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
#endif

	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
				page_size_mask & (1<<PG_LEVEL_2M));
		pos = end_pfn << PAGE_SHIFT;
	}

#ifdef CONFIG_X86_64
	/* big page (1G) range */
	start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
			 << (PUD_SHIFT - PAGE_SHIFT);
	end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
				page_size_mask &
				 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
		pos = end_pfn << PAGE_SHIFT;
	}

	/* tail is not big page (1G) alignment */
	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
			 << (PMD_SHIFT - PAGE_SHIFT);
	end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
	if (start_pfn < end_pfn) {
		nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
				page_size_mask & (1<<PG_LEVEL_2M));
		pos = end_pfn << PAGE_SHIFT;
	}
#endif

	/* tail is not big page (2M) alignment */
	start_pfn = pos>>PAGE_SHIFT;
	end_pfn = end>>PAGE_SHIFT;
	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);

	/* try to merge same page size and continuous */
	for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
		unsigned long old_start;
		if (mr[i].end != mr[i+1].start ||
		    mr[i].page_size_mask != mr[i+1].page_size_mask)
			continue;
		/* move it */
		old_start = mr[i].start;
		memmove(&mr[i], &mr[i+1],
			(nr_range - 1 - i) * sizeof(struct map_range));
		mr[i--].start = old_start;
		nr_range--;
	}

	for (i = 0; i < nr_range; i++)
		printk(KERN_DEBUG " %010lx - %010lx page %s\n",
				mr[i].start, mr[i].end,
			(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
			 (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));

	/*
	 * Find space for the kernel direct mapping tables.
	 *
	 * Later we should allocate these tables in the local node of the
	 * memory mapped. Unfortunately this is done currently before the
	 * nodes are discovered.
	 */
	if (!after_bootmem)
		find_early_table_space(end, use_pse, use_gbpages);

#ifdef CONFIG_X86_32
	for (i = 0; i < nr_range; i++)
		kernel_physical_mapping_init(
				mr[i].start >> PAGE_SHIFT,
				mr[i].end >> PAGE_SHIFT,
				mr[i].page_size_mask == (1<<PG_LEVEL_2M));
	ret = end;
#else /* CONFIG_X86_64 */
	for (i = 0; i < nr_range; i++)
		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
						   mr[i].page_size_mask);
#endif

#ifdef CONFIG_X86_32
	early_ioremap_page_table_range_init();

	load_cr3(swapper_pg_dir);
#endif

#ifdef CONFIG_X86_64
	if (!after_bootmem)
		mmu_cr4_features = read_cr4();
#endif
	__flush_tlb_all();

	if (!after_bootmem && table_end > table_start)
		reserve_early(table_start << PAGE_SHIFT,
				 table_end << PAGE_SHIFT, "PGTABLE");

	if (!after_bootmem)
		early_memtest(start, end);

	return ret >> PAGE_SHIFT;
}


/*
 * devmem_is_allowed() checks to see if /dev/mem access to a certain address
 * is valid. The argument is a physical page number.
 *
 *
 * On x86, access has to be given to the first megabyte of ram because that area
 * contains bios code and data regions used by X and dosemu and similar apps.
 * Access has to be given to non-kernel-ram areas as well, these contain the PCI
 * mmio resources as well as potential bios/acpi data regions.
 */
int devmem_is_allowed(unsigned long pagenr)
{
	if (pagenr <= 256)
		return 1;
	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
		return 0;
	if (!page_is_ram(pagenr))
		return 1;
	return 0;
}

void free_init_pages(char *what, unsigned long begin, unsigned long end)
{
	unsigned long addr = begin;

	if (addr >= end)
		return;

	/*
	 * If debugging page accesses then do not free this memory but
	 * mark them not present - any buggy init-section access will
	 * create a kernel page fault:
	 */
#ifdef CONFIG_DEBUG_PAGEALLOC
	printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
		begin, PAGE_ALIGN(end));
	set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
#else
	/*
	 * We just marked the kernel text read only above, now that
	 * we are going to free part of that, we need to make that
	 * writeable first.
	 */
	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);

	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);

	for (; addr < end; addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		memset((void *)(addr & ~(PAGE_SIZE-1)),
			POISON_FREE_INITMEM, PAGE_SIZE);
		free_page(addr);
		totalram_pages++;
	}
#endif
}

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
Commit	Line	Data
540aca06	1	#include <linux/ioport.h>
e5b2bb55	2	#include <linux/swap.h>
540aca06	3
e5b2bb55	4	#include <asm/cacheflush.h>
f765090a	5	#include <asm/e820.h>
e5b2bb55	6	#include <asm/page.h>
540aca06	7	#include <asm/page_types.h>
e5b2bb55 PE	8	#include <asm/sections.h>
e5b2bb55 PE	9	#include <asm/system.h>
f765090a PE	10	#include <asm/tlbflush.h>
	11
	12	#ifdef CONFIG_X86_32
	13	extern void __init early_ioremap_page_table_range_init(void);
	14	extern void __init kernel_physical_mapping_init(unsigned long start_pfn,
	15	unsigned long end_pfn,
	16	int use_pse);
	17	#endif
	18
	19	#ifdef CONFIG_X86_64
	20	extern unsigned long __meminit
	21	kernel_physical_mapping_init(unsigned long start,
	22	unsigned long end,
	23	unsigned long page_size_mask);
	24	#endif
	25
	26	unsigned long __initdata table_start;
	27	unsigned long __meminitdata table_end;
	28	unsigned long __meminitdata table_top;
	29
	30	int after_bootmem;
	31
	32	int direct_gbpages
	33	#ifdef CONFIG_DIRECT_GBPAGES
	34	= 1
	35	#endif
	36	;
	37
	38	static void __init find_early_table_space(unsigned long end, int use_pse,
	39	int use_gbpages)
	40	{
	41	unsigned long puds, pmds, ptes, tables, start;
	42
	43	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
	44	tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
	45
	46	if (use_gbpages) {
	47	unsigned long extra;
	48
	49	extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
	50	pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
	51	} else
	52	pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
	53
	54	tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
	55
	56	if (use_pse) {
	57	unsigned long extra;
	58
	59	extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
	60	#ifdef CONFIG_X86_32
	61	extra += PMD_SIZE;
	62	#endif
	63	ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
	64	} else
	65	ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
	66
	67	tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
	68
	69	#ifdef CONFIG_X86_32
	70	/* for fixmap */
	71	tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
	72	#endif
	73
74	/*
75	* RED-PEN putting page tables only on node 0 could
76	* cause a hotspot and fill up ZONE_DMA. The page tables
77	* need roughly 0.5KB per GB.
78	*/
79	#ifdef CONFIG_X86_32
80	start = 0x7000;
81	table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
82	tables, PAGE_SIZE);
83	#else /* CONFIG_X86_64 */
84	start = 0x8000;
85	table_start = find_e820_area(start, end, tables, PAGE_SIZE);
86	#endif
87	if (table_start == -1UL)
88	panic("Cannot find space for the kernel page tables");
89
90	table_start >>= PAGE_SHIFT;
91	table_end = table_start;
92	table_top = table_start + (tables >> PAGE_SHIFT);
93
94	printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
95	end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT);
96	}
97
98	struct map_range {
99	unsigned long start;
100	unsigned long end;
101	unsigned page_size_mask;
102	};
103
104	#ifdef CONFIG_X86_32
105	#define NR_RANGE_MR 3
106	#else /* CONFIG_X86_64 */
107	#define NR_RANGE_MR 5
108	#endif
109
110	static int save_mr(struct map_range *mr, int nr_range,
111	unsigned long start_pfn, unsigned long end_pfn,
112	unsigned long page_size_mask)
113	{
114	if (start_pfn < end_pfn) {
115	if (nr_range >= NR_RANGE_MR)
116	panic("run out of range for init_memory_mapping\n");
117	mr[nr_range].start = start_pfn<<PAGE_SHIFT;
118	mr[nr_range].end = end_pfn<<PAGE_SHIFT;
119	mr[nr_range].page_size_mask = page_size_mask;
120	nr_range++;
121	}
122
123	return nr_range;
124	}
125
126	#ifdef CONFIG_X86_64
127	static void __init init_gbpages(void)
128	{
129	if (direct_gbpages && cpu_has_gbpages)
130	printk(KERN_INFO "Using GB pages for direct mapping\n");
131	else
132	direct_gbpages = 0;
133	}
134	#else
135	static inline void init_gbpages(void)
136	{
137	}
138	#endif
139
140	/*
141	* Setup the direct mapping of the physical memory at PAGE_OFFSET.
142	* This runs before bootmem is initialized and gets pages directly from
143	* the physical memory. To access them they are temporarily mapped.
144	*/
145	unsigned long __init_refok init_memory_mapping(unsigned long start,
146	unsigned long end)
147	{
148	unsigned long page_size_mask = 0;
149	unsigned long start_pfn, end_pfn;
150	unsigned long pos;
151	unsigned long ret;
152
153	struct map_range mr[NR_RANGE_MR];
154	int nr_range, i;
155	int use_pse, use_gbpages;
156
157	printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
158
159	if (!after_bootmem)
160	init_gbpages();
161
162	#ifdef CONFIG_DEBUG_PAGEALLOC
163	/*
164	* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
165	* This will simplify cpa(), which otherwise needs to support splitting
166	* large pages into small in interrupt context, etc.
167	*/
168	use_pse = use_gbpages = 0;
169	#else
170	use_pse = cpu_has_pse;
171	use_gbpages = direct_gbpages;
172	#endif
173
174	#ifdef CONFIG_X86_32
175	#ifdef CONFIG_X86_PAE
176	set_nx();
177	if (nx_enabled)
178	printk(KERN_INFO "NX (Execute Disable) protection: active\n");
179	#endif
180
181	/* Enable PSE if available */
182	if (cpu_has_pse)
183	set_in_cr4(X86_CR4_PSE);
184
185	/* Enable PGE if available */
186	if (cpu_has_pge) {
187	set_in_cr4(X86_CR4_PGE);
188	__supported_pte_mask \|= _PAGE_GLOBAL;
189	}
190	#endif
191
192	if (use_gbpages)
193	page_size_mask \|= 1 << PG_LEVEL_1G;
194	if (use_pse)
195	page_size_mask \|= 1 << PG_LEVEL_2M;
196
197	memset(mr, 0, sizeof(mr));
198	nr_range = 0;
199
200	/* head if not big page alignment ? */
201	start_pfn = start >> PAGE_SHIFT;
202	pos = start_pfn << PAGE_SHIFT;
203	#ifdef CONFIG_X86_32
204	/*
205	* Don't use a large page for the first 2/4MB of memory
206	* because there are often fixed size MTRRs in there
207	* and overlapping MTRRs into large pages can cause
208	* slowdowns.
209	*/
210	if (pos == 0)
211	end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
212	else
213	end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
214	<< (PMD_SHIFT - PAGE_SHIFT);
215	#else /* CONFIG_X86_64 */
216	end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
217	<< (PMD_SHIFT - PAGE_SHIFT);
218	#endif
219	if (end_pfn > (end >> PAGE_SHIFT))
220	end_pfn = end >> PAGE_SHIFT;
221	if (start_pfn < end_pfn) {
222	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
223	pos = end_pfn << PAGE_SHIFT;
224	}
225
226	/* big page (2M) range */
227	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
228	<< (PMD_SHIFT - PAGE_SHIFT);
229	#ifdef CONFIG_X86_32
230	end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
231	#else /* CONFIG_X86_64 */
232	end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
233	<< (PUD_SHIFT - PAGE_SHIFT);
234	if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
235	end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
236	#endif
237
238	if (start_pfn < end_pfn) {
239	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
240	page_size_mask & (1<<PG_LEVEL_2M));
241	pos = end_pfn << PAGE_SHIFT;
242	}
243
244	#ifdef CONFIG_X86_64
245	/* big page (1G) range */
246	start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
247	<< (PUD_SHIFT - PAGE_SHIFT);
248	end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
249	if (start_pfn < end_pfn) {
250	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
251	page_size_mask &
252	((1<<PG_LEVEL_2M)\|(1<<PG_LEVEL_1G)));
253	pos = end_pfn << PAGE_SHIFT;
254	}
255
256	/* tail is not big page (1G) alignment */
257	start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
258	<< (PMD_SHIFT - PAGE_SHIFT);
259	end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
260	if (start_pfn < end_pfn) {
261	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
262	page_size_mask & (1<<PG_LEVEL_2M));
263	pos = end_pfn << PAGE_SHIFT;
264	}
265	#endif
266
267	/* tail is not big page (2M) alignment */
268	start_pfn = pos>>PAGE_SHIFT;
269	end_pfn = end>>PAGE_SHIFT;
270	nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
271
272	/* try to merge same page size and continuous */
273	for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
274	unsigned long old_start;
275	if (mr[i].end != mr[i+1].start \|\|
276	mr[i].page_size_mask != mr[i+1].page_size_mask)
277	continue;
278	/* move it */
279	old_start = mr[i].start;
280	memmove(&mr[i], &mr[i+1],
281	(nr_range - 1 - i) * sizeof(struct map_range));
282	mr[i--].start = old_start;
283	nr_range--;
284	}
285
286	for (i = 0; i < nr_range; i++)
287	printk(KERN_DEBUG " %010lx - %010lx page %s\n",
288	mr[i].start, mr[i].end,
289	(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
290	(mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
291
292	/*
293	* Find space for the kernel direct mapping tables.
294	*
295	* Later we should allocate these tables in the local node of the
296	* memory mapped. Unfortunately this is done currently before the
297	* nodes are discovered.
298	*/
299	if (!after_bootmem)
300	find_early_table_space(end, use_pse, use_gbpages);
301
302	#ifdef CONFIG_X86_32
303	for (i = 0; i < nr_range; i++)
304	kernel_physical_mapping_init(
305	mr[i].start >> PAGE_SHIFT,
306	mr[i].end >> PAGE_SHIFT,
307	mr[i].page_size_mask == (1<<PG_LEVEL_2M));
308	ret = end;
309	#else /* CONFIG_X86_64 */
310	for (i = 0; i < nr_range; i++)
311	ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
312	mr[i].page_size_mask);
313	#endif
314
315	#ifdef CONFIG_X86_32
316	early_ioremap_page_table_range_init();
317
318	load_cr3(swapper_pg_dir);
319	#endif
320
321	#ifdef CONFIG_X86_64
322	if (!after_bootmem)
323	mmu_cr4_features = read_cr4();
324	#endif
325	__flush_tlb_all();
326
327	if (!after_bootmem && table_end > table_start)
328	reserve_early(table_start << PAGE_SHIFT,
329	table_end << PAGE_SHIFT, "PGTABLE");
330
331	if (!after_bootmem)
332	early_memtest(start, end);
333
334	return ret >> PAGE_SHIFT;
335	}
336
e5b2bb55	337
540aca06 PE	338	/*
	339	* devmem_is_allowed() checks to see if /dev/mem access to a certain address
	340	* is valid. The argument is a physical page number.
	341	*
	342	*
	343	* On x86, access has to be given to the first megabyte of ram because that area
	344	* contains bios code and data regions used by X and dosemu and similar apps.
	345	* Access has to be given to non-kernel-ram areas as well, these contain the PCI
	346	* mmio resources as well as potential bios/acpi data regions.
	347	*/
	348	int devmem_is_allowed(unsigned long pagenr)
	349	{
	350	if (pagenr <= 256)
	351	return 1;
	352	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
	353	return 0;
	354	if (!page_is_ram(pagenr))
	355	return 1;
	356	return 0;
	357	}
	358
e5b2bb55 PE	359	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	360	{
	361	unsigned long addr = begin;
	362
	363	if (addr >= end)
	364	return;
	365
	366	/*
	367	* If debugging page accesses then do not free this memory but
	368	* mark them not present - any buggy init-section access will
	369	* create a kernel page fault:
	370	*/
	371	#ifdef CONFIG_DEBUG_PAGEALLOC
	372	printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
	373	begin, PAGE_ALIGN(end));
	374	set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
	375	#else
	376	/*
	377	* We just marked the kernel text read only above, now that
	378	* we are going to free part of that, we need to make that
	379	* writeable first.
	380	*/
	381	set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
	382
	383	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
	384
	385	for (; addr < end; addr += PAGE_SIZE) {
	386	ClearPageReserved(virt_to_page(addr));
	387	init_page_count(virt_to_page(addr));
	388	memset((void *)(addr & ~(PAGE_SIZE-1)),
	389	POISON_FREE_INITMEM, PAGE_SIZE);
	390	free_page(addr);
	391	totalram_pages++;
	392	}
	393	#endif
	394	}
	395
	396	void free_initmem(void)
	397	{
	398	free_init_pages("unused kernel memory",
	399	(unsigned long)(&__init_begin),
	400	(unsigned long)(&__init_end));
	401	}
731ddea6 PE	402
	403	#ifdef CONFIG_BLK_DEV_INITRD
	404	void free_initrd_mem(unsigned long start, unsigned long end)
	405	{
	406	free_init_pages("initrd memory", start, end);
	407	}
	408	#endif