Release 4.14 arch/x86/mm/init_32.c

/*
 *
 *  Copyright (C) 1995  Linus Torvalds
 *
 *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
 */

#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/hugetlb.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/pci.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/proc_fs.h>
#include <linux/memory_hotplug.h>
#include <linux/initrd.h>
#include <linux/cpumask.h>
#include <linux/gfp.h>

#include <asm/asm.h>
#include <asm/bios_ebda.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/dma.h>
#include <asm/fixmap.h>
#include <asm/e820/api.h>
#include <asm/apic.h>
#include <asm/bugs.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/olpc_ofw.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>
#include <asm/paravirt.h>
#include <asm/setup.h>
#include <asm/set_memory.h>
#include <asm/page_types.h>
#include <asm/init.h>

#include "mm_internal.h"



unsigned long highstart_pfn, highend_pfn;


bool __read_mostly __vmalloc_start_set = false;

/*
 * Creates a middle page table and puts a pointer to it in the
 * given global directory entry. This only returns the gd entry
 * in non-PAE compilation mode, since the middle layer is folded.
 */


static pmd_t * __init one_md_table_init(pgd_t *pgd)
{
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd_table;

#ifdef CONFIG_X86_PAE
	if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
		pmd_table = (pmd_t *)alloc_low_page();
		paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
		set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
		p4d = p4d_offset(pgd, 0);
		pud = pud_offset(p4d, 0);
		BUG_ON(pmd_table != pmd_offset(pud, 0));

		return pmd_table;
	}
#endif
	p4d = p4d_offset(pgd, 0);
	pud = pud_offset(p4d, 0);
	pmd_table = pmd_offset(pud, 0);

	return pmd_table;
}

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24
16.67%
1
5.88%
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22
15.28%
1
5.88%
Jeremy Fitzhardinge
21
14.58%
3
17.65%
Linus Torvalds (pre-git)
10
6.94%
4
23.53%
Zachary Amsden
9
6.25%
1
5.88%
Yinghai Lu
8
5.56%
1
5.88%
Ingo Molnar
3
2.08%
1
5.88%
Zhao Lei
3
2.08%
1
5.88%
Linus Torvalds
2
1.39%
1
5.88%
Jan Beulich
1
0.69%
1
5.88%
William Lee Irwin III
1
0.69%
1
5.88%
Total
144
100.00%
17
100.00%

/*
 * Create a page table and place a pointer to it in a middle page
 * directory entry:
 */


static pte_t * __init one_page_table_init(pmd_t *pmd)
{
	if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
		pte_t *page_table = (pte_t *)alloc_low_page();

		paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
		set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
		BUG_ON(page_table != pte_offset_kernel(pmd, 0));
	}

	return pte_offset_kernel(pmd, 0);
}

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Brian Gerst
17
19.77%
1
7.69%
Linus Torvalds (pre-git)
16
18.60%
3
23.08%
Jeremy Fitzhardinge
13
15.12%
3
23.08%
Zachary Amsden
9
10.47%
1
7.69%
Yinghai Lu
6
6.98%
2
15.38%
Linus Torvalds
1
1.16%
1
7.69%
Jan Beulich
1
1.16%
1
7.69%
Total
86
100.00%
13
100.00%



pmd_t * __init populate_extra_pmd(unsigned long vaddr)
{
	int pgd_idx = pgd_index(vaddr);
	int pmd_idx = pmd_index(vaddr);

	return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx;
}

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37
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2
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pte_t * __init populate_extra_pte(unsigned long vaddr)
{
	int pte_idx = pte_index(vaddr);
	pmd_t *pmd;

	pmd = populate_extra_pmd(vaddr);
	return one_page_table_init(pmd) + pte_idx;
}

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38
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2
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static unsigned long __init

page_table_range_init_count(unsigned long start, unsigned long end)
{
	unsigned long count = 0;
#ifdef CONFIG_HIGHMEM
	int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
	int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
	int pgd_idx, pmd_idx;
	unsigned long vaddr;

	if (pmd_idx_kmap_begin == pmd_idx_kmap_end)
		return 0;

	vaddr = start;
	pgd_idx = pgd_index(vaddr);
	pmd_idx = pmd_index(vaddr);

	for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) {
		for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
							pmd_idx++) {
			if ((vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin &&
			    (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end)
				count++;
			vaddr += PMD_SIZE;
		}
		pmd_idx = 0;
	}
#endif
	return count;
}

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7
4.52%
1
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155
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2
100.00%



static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
					   unsigned long vaddr, pte_t *lastpte,
					   void **adr)
{
#ifdef CONFIG_HIGHMEM
	/*
         * Something (early fixmap) may already have put a pte
         * page here, which causes the page table allocation
         * to become nonlinear. Attempt to fix it, and if it
         * is still nonlinear then we have to bug.
         */
	int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
	int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;

	if (pmd_idx_kmap_begin != pmd_idx_kmap_end
	    && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin
	    && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) {
		pte_t *newpte;
		int i;

		BUG_ON(after_bootmem);
		newpte = *adr;
		for (i = 0; i < PTRS_PER_PTE; i++)
			set_pte(newpte + i, pte[i]);
		*adr = (void *)(((unsigned long)(*adr)) + PAGE_SIZE);

		paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT);
		set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE));
		BUG_ON(newpte != pte_offset_kernel(pmd, 0));
		__flush_tlb_all();

		paravirt_release_pte(__pa(pte) >> PAGE_SHIFT);
		pte = newpte;
	}
	BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)
	       && vaddr > fix_to_virt(FIX_KMAP_END)
	       && lastpte && lastpte + PTRS_PER_PTE != pte);
#endif
	return pte;
}

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29
12.61%
1
33.33%
Pekka J Enberg
1
0.43%
1
33.33%
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230
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3
100.00%

/*
 * This function initializes a certain range of kernel virtual memory
 * with new bootmem page tables, everywhere page tables are missing in
 * the given range.
 *
 * NOTE: The pagetables are allocated contiguous on the physical space
 * so we can cache the place of the first one and move around without
 * checking the pgd every time.
 */

static void __init

page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
{
	int pgd_idx, pmd_idx;
	unsigned long vaddr;
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte = NULL;
	unsigned long count = page_table_range_init_count(start, end);
	void *adr = NULL;

	if (count)
		adr = alloc_low_pages(count);

	vaddr = start;
	pgd_idx = pgd_index(vaddr);
	pmd_idx = pmd_index(vaddr);
	pgd = pgd_base + pgd_idx;

	for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
		pmd = one_md_table_init(pgd);
		pmd = pmd + pmd_index(vaddr);
		for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
							pmd++, pmd_idx++) {
			pte = page_table_kmap_check(one_page_table_init(pmd),
						    pmd, vaddr, pte, &adr);

			vaddr += PMD_SIZE;
		}
		pmd_idx = 0;
	}
}

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Linus Torvalds (pre-git)
103
56.28%
3
27.27%
Yinghai Lu
31
16.94%
1
9.09%
Jan Beulich
17
9.29%
1
9.09%
Andrew Morton
12
6.56%
2
18.18%
Ingo Molnar
8
4.37%
1
9.09%
Andi Kleen
5
2.73%
1
9.09%
Jeremy Fitzhardinge
5
2.73%
1
9.09%
Dan Aloni
2
1.09%
1
9.09%
Total
183
100.00%
11
100.00%



static inline int is_kernel_text(unsigned long addr)
{
	if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end)
		return 1;
	return 0;
}

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5
14.29%
1
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35
100.00%
2
100.00%

/*
 * This maps the physical memory to kernel virtual address space, a total
 * of max_low_pfn pages, by creating page tables starting from address
 * PAGE_OFFSET:
 */

unsigned long __init

kernel_physical_mapping_init(unsigned long start,
			     unsigned long end,
			     unsigned long page_size_mask)
{
	int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
	unsigned long last_map_addr = end;
	unsigned long start_pfn, end_pfn;
	pgd_t *pgd_base = swapper_pg_dir;
	int pgd_idx, pmd_idx, pte_ofs;
	unsigned long pfn;
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;
	unsigned pages_2m, pages_4k;
	int mapping_iter;

	start_pfn = start >> PAGE_SHIFT;
	end_pfn = end >> PAGE_SHIFT;

	/*
         * First iteration will setup identity mapping using large/small pages
         * based on use_pse, with other attributes same as set by
         * the early code in head_32.S
         *
         * Second iteration will setup the appropriate attributes (NX, GLOBAL..)
         * as desired for the kernel identity mapping.
         *
         * This two pass mechanism conforms to the TLB app note which says:
         *
         *     "Software should not write to a paging-structure entry in a way
         *      that would change, for any linear address, both the page size
         *      and either the page frame or attributes."
         */
	mapping_iter = 1;

	if (!boot_cpu_has(X86_FEATURE_PSE))
		use_pse = 0;

repeat:
	pages_2m = pages_4k = 0;
	pfn = start_pfn;
	pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
	pgd = pgd_base + pgd_idx;
	for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
		pmd = one_md_table_init(pgd);

		if (pfn >= end_pfn)
			continue;
#ifdef CONFIG_X86_PAE
		pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
		pmd += pmd_idx;
#else
		pmd_idx = 0;
#endif
		for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
		     pmd++, pmd_idx++) {
			unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;

			/*
                         * Map with big pages if possible, otherwise
                         * create normal page tables:
                         */
			if (use_pse) {
				unsigned int addr2;
				pgprot_t prot = PAGE_KERNEL_LARGE;
				/*
                                 * first pass will use the same initial
                                 * identity mapping attribute + _PAGE_PSE.
                                 */
				pgprot_t init_prot =
					__pgprot(PTE_IDENT_ATTR |
						 _PAGE_PSE);

				pfn &= PMD_MASK >> PAGE_SHIFT;
				addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
					PAGE_OFFSET + PAGE_SIZE-1;

				if (is_kernel_text(addr) ||
				    is_kernel_text(addr2))
					prot = PAGE_KERNEL_LARGE_EXEC;

				pages_2m++;
				if (mapping_iter == 1)
					set_pmd(pmd, pfn_pmd(pfn, init_prot));
				else
					set_pmd(pmd, pfn_pmd(pfn, prot));

				pfn += PTRS_PER_PTE;
				continue;
			}
			pte = one_page_table_init(pmd);

			pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
			pte += pte_ofs;
			for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
			     pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
				pgprot_t prot = PAGE_KERNEL;
				/*
                                 * first pass will use the same initial
                                 * identity mapping attribute.
                                 */
				pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);

				if (is_kernel_text(addr))
					prot = PAGE_KERNEL_EXEC;

				pages_4k++;
				if (mapping_iter == 1) {
					set_pte(pte, pfn_pte(pfn, init_prot));
					last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE;
				} else
					set_pte(pte, pfn_pte(pfn, prot));
			}
		}
	}
	if (mapping_iter == 1) {
		/*
                 * update direct mapping page count only in the first
                 * iteration.
                 */
		update_page_count(PG_LEVEL_2M, pages_2m);
		update_page_count(PG_LEVEL_4K, pages_4k);

		/*
                 * local global flush tlb, which will flush the previous
                 * mappings present in both small and large page TLB's.
                 */
		__flush_tlb_all();

		/*
                 * Second iteration will set the actual desired PTE attributes.
                 */
		mapping_iter = 2;
		goto repeat;
	}
	return last_map_addr;
}

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95
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3.03%
Linus Torvalds (pre-git)
89
18.16%
11
33.33%
Yinghai Lu
79
16.12%
4
12.12%
Ingo Molnar
64
13.06%
2
6.06%
Pekka J Enberg
60
12.24%
3
9.09%
Brian Gerst
26
5.31%
2
6.06%
Andi Kleen
25
5.10%
1
3.03%
Jeremy Fitzhardinge
21
4.29%
2
6.06%
Andrew Morton
14
2.86%
3
9.09%
Dan Aloni
9
1.84%
1
3.03%
Borislav Petkov
4
0.82%
1
3.03%
Arjan van de Ven
3
0.61%
1
3.03%
Roman Zippel
1
0.20%
1
3.03%
Total
490
100.00%
33
100.00%


pte_t *kmap_pte;



static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
{
	pgd_t *pgd = pgd_offset_k(vaddr);
	p4d_t *p4d = p4d_offset(pgd, vaddr);
	pud_t *pud = pud_offset(p4d, vaddr);
	pmd_t *pmd = pmd_offset(pud, vaddr);
	return pte_offset_kernel(pmd, vaddr);
}

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33.33%
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22
35.48%
1
33.33%
Dan Aloni
4
6.45%
1
33.33%
Total
62
100.00%
3
100.00%



static void __init kmap_init(void)
{
	unsigned long kmap_vstart;

	/*
         * Cache the first kmap pte:
         */
	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
}

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33.33%
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1
3.57%
1
33.33%
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28
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3
100.00%

#ifdef CONFIG_HIGHMEM


static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
	unsigned long vaddr;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	vaddr = PKMAP_BASE;
	page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);

	pgd = swapper_pg_dir + pgd_index(vaddr);
	p4d = p4d_offset(pgd, vaddr);
	pud = pud_offset(p4d, vaddr);
	pmd = pmd_offset(pud, vaddr);
	pte = pte_offset_kernel(pmd, vaddr);
	pkmap_page_table = pte;
}

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33
32.67%
3
30.00%
Kirill A. Shutemov
14
13.86%
1
10.00%
Andi Kleen
13
12.87%
1
10.00%
Ingo Molnar
5
4.95%
2
20.00%
Andrew Morton
1
0.99%
1
10.00%
Adrian Bunk
1
0.99%
1
10.00%
Total
101
100.00%
10
100.00%



void __init add_highpages_with_active_regions(int nid,
			 unsigned long start_pfn, unsigned long end_pfn)
{
	phys_addr_t start, end;
	u64 i;

	for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &start, &end, NULL) {
		unsigned long pfn = clamp_t(unsigned long, PFN_UP(start),
					    start_pfn, end_pfn);
		unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end),
					      start_pfn, end_pfn);
		for ( ; pfn < e_pfn; pfn++)
			if (pfn_valid(pfn))
				free_highmem_page(pfn_to_page(pfn));
	}
}
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23
23.96%
2
25.00%
Andrew Morton
17
17.71%
2
25.00%
Ingo Molnar
7
7.29%
1
12.50%
Tony Luck
2
2.08%
1
12.50%
Jiang Liu
1
1.04%
1
12.50%
Total
96
100.00%
8
100.00%

#else


static inline void permanent_kmaps_init(pgd_t *pgd_base)
{
}
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#endif /* CONFIG_HIGHMEM */



void __init native_pagetable_init(void)
{
	unsigned long pfn, va;
	pgd_t *pgd, *base = swapper_pg_dir;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	/*
         * Remove any mappings which extend past the end of physical
         * memory from the boot time page table.
         * In virtual address space, we should have at least two pages
         * from VMALLOC_END to pkmap or fixmap according to VMALLOC_END
         * definition. And max_low_pfn is set to VMALLOC_END physical
         * address. If initial memory mapping is doing right job, we
         * should have pte used near max_low_pfn or one pmd is not present.
         */
	for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) {
		va = PAGE_OFFSET + (pfn<<PAGE_SHIFT);
		pgd = base + pgd_index(va);
		if (!pgd_present(*pgd))
			break;

		p4d = p4d_offset(pgd, va);
		pud = pud_offset(p4d, va);
		pmd = pmd_offset(pud, va);
		if (!pmd_present(*pmd))
			break;

		/* should not be large page here */
		if (pmd_large(*pmd)) {
			pr_warn("try to clear pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx, but pmd is big page and is not using pte !\n",
				pfn, pmd, __pa(pmd));
			BUG_ON(1);
		}

		pte = pte_offset_kernel(pmd, va);
		if (!pte_present(*pte))
			break;

		printk(KERN_DEBUG "clearing pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx pte: %p pte phys: %lx\n",
				pfn, pmd, __pa(pmd), pte, __pa(pte));
		pte_clear(NULL, va, pte);
	}
	paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT);
	paging_init();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ian Campbell
105
47.09%
1
7.69%
Yinghai Lu
53
23.77%
1
7.69%
Jeremy Fitzhardinge
16
7.17%
3
23.08%
Kirill A. Shutemov
14
6.28%
1
7.69%
Dan Aloni
13
5.83%
1
7.69%
Attilio Rao
10
4.48%
3
23.08%
Zachary Amsden
8
3.59%
1
7.69%
Linus Torvalds (pre-git)
3
1.35%
1
7.69%
Linus Torvalds
1
0.45%
1
7.69%
Total
223
100.00%
13
100.00%

/*
 * Build a proper pagetable for the kernel mappings.  Up until this
 * point, we've been running on some set of pagetables constructed by
 * the boot process.
 *
 * If we're booting on native hardware, this will be a pagetable
 * constructed in arch/x86/kernel/head_32.S.  The root of the
 * pagetable will be swapper_pg_dir.
 *
 * If we're booting paravirtualized under a hypervisor, then there are
 * more options: we may already be running PAE, and the pagetable may
 * or may not be based in swapper_pg_dir.  In any case,
 * paravirt_pagetable_init() will set up swapper_pg_dir
 * appropriately for the rest of the initialization to work.
 *
 * In general, pagetable_init() assumes that the pagetable may already
 * be partially populated, and so it avoids stomping on any existing
 * mappings.
 */


void __init early_ioremap_page_table_range_init(void)
{
	pgd_t *pgd_base = swapper_pg_dir;
	unsigned long vaddr, end;

	/*
         * Fixed mappings, only the page table structure has to be
         * created - mappings will be set by set_fixmap():
         */
	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
	end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
	page_table_range_init(vaddr, end, pgd_base);
	early_ioremap_reset();
}

Contributors
Person
Tokens
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Commits
CommitProp
Jeremy Fitzhardinge
19
33.93%
1
11.11%
Dan Aloni
18
32.14%
1
11.11%
Ingo Molnar
6
10.71%
1
11.11%
Pekka J Enberg
4
7.14%
1
11.11%
Yinghai Lu
4
7.14%
1
11.11%
Huang Ying
3
5.36%
2
22.22%
Linus Torvalds (pre-git)
2
3.57%
2
22.22%
Total
56
100.00%
9
100.00%



static void __init pagetable_init(void)
{
	pgd_t *pgd_base = swapper_pg_dir;

	permanent_kmaps_init(pgd_base);
}

Contributors
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CommitProp
Yinghai Lu
14
70.00%
1
50.00%
Dan Aloni
6
30.00%
1
50.00%
Total
20
100.00%
2
100.00%


pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL);

EXPORT_SYMBOL_GPL(__supported_pte_mask);

/* user-defined highmem size */

static unsigned int highmem_pages = -1;

/*
 * highmem=size forces highmem to be exactly 'size' bytes.
 * This works even on boxes that have no highmem otherwise.
 * This also works to reduce highmem size on bigger boxes.
 */


static int __init parse_highmem(char *arg)
{
	if (!arg)
		return -EINVAL;

	highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
	return 0;
}
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Yinghai Lu
35
100.00%
1
100.00%
Total
35
100.00%
1
100.00%

early_param("highmem", parse_highmem);


#define MSG_HIGHMEM_TOO_BIG \
	"highmem size (%luMB) is bigger than pages available (%luMB)!\n"


#define MSG_LOWMEM_TOO_SMALL \
	"highmem size (%luMB) results in <64MB lowmem, ignoring it!\n"
/*
 * All of RAM fits into lowmem - but if user wants highmem
 * artificially via the highmem=x boot parameter then create
 * it:
 */


static void __init lowmem_pfn_init(void)
{
	/* max_low_pfn is 0, we already have early_res support */
	max_low_pfn = max_pfn;

	if (highmem_pages == -1)
		highmem_pages = 0;
#ifdef CONFIG_HIGHMEM
	if (highmem_pages >= max_pfn) {
		printk(KERN_ERR MSG_HIGHMEM_TOO_BIG,
			pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
		highmem_pages = 0;
	}
	if (highmem_pages) {
		if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) {
			printk(KERN_ERR MSG_LOWMEM_TOO_SMALL,
				pages_to_mb(highmem_pages));
			highmem_pages = 0;
		}
		max_low_pfn -= highmem_pages;
	}
#else
	if (highmem_pages)
		printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
#endif
}

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Person
Tokens
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Commits
CommitProp
Ingo Molnar
67
67.00%
1
16.67%
Yinghai Lu
33
33.00%
5
83.33%
Total
100
100.00%
6
100.00%


#define MSG_HIGHMEM_TOO_SMALL \
	"only %luMB highmem pages available, ignoring highmem size of %luMB!\n"


#define MSG_HIGHMEM_TRIMMED \
	"Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n"
/*
 * We have more RAM than fits into lowmem - we try to put it into
 * highmem, also taking the highmem=x boot parameter into account:
 */


static void __init highmem_pfn_init(void)
{
	max_low_pfn = MAXMEM_PFN;

	if (highmem_pages == -1)
		highmem_pages = max_pfn - MAXMEM_PFN;

	if (highmem_pages + MAXMEM_PFN < max_pfn)
		max_pfn = MAXMEM_PFN + highmem_pages;

	if (highmem_pages + MAXMEM_PFN > max_pfn) {
		printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL,
			pages_to_mb(max_pfn - MAXMEM_PFN),
			pages_to_mb(highmem_pages));
		highmem_pages = 0;
	}
#ifndef CONFIG_HIGHMEM
	/* Maximum memory usable is what is directly addressable */
	printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20);
	if (max_pfn > MAX_NONPAE_PFN)
		printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
	else
		printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
	max_pfn = MAXMEM_PFN;
#else /* !CONFIG_HIGHMEM */
#ifndef CONFIG_HIGHMEM64G
	if (max_pfn > MAX_NONPAE_PFN) {
		max_pfn = MAX_NONPAE_PFN;
		printk(KERN_WARNING MSG_HIGHMEM_TRIMMED);
	}
#endif /* !CONFIG_HIGHMEM64G */
#endif /* !CONFIG_HIGHMEM */
}

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Person
Tokens
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CommitProp
Yinghai Lu
121
93.80%
4
66.67%
Ingo Molnar
8
6.20%
2
33.33%
Total
129
100.00%
6
100.00%

/*
 * Determine low and high memory ranges:
 */


void __init find_low_pfn_range(void)
{
	/* it could update max_pfn */

	if (max_pfn <= MAXMEM_PFN)
		lowmem_pfn_init();
	else
		highmem_pfn_init();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ingo Molnar
14
63.64%
2
66.67%
Yinghai Lu
8
36.36%
1
33.33%
Total
22
100.00%
3
100.00%

#ifndef CONFIG_NEED_MULTIPLE_NODES


void __init initmem_init(void)
{
#ifdef CONFIG_HIGHMEM
	highstart_pfn = highend_pfn = max_pfn;
	if (max_pfn > max_low_pfn)
		highstart_pfn = max_low_pfn;
	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
		pages_to_mb(highend_pfn - highstart_pfn));
	high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif

	memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
	sparse_memory_present_with_active_regions(0);

#ifdef CONFIG_FLATMEM
	max_mapnr = IS_ENABLED(CONFIG_HIGHMEM) ? highend_pfn : max_low_pfn;
#endif
	__vmalloc_start_set = true;

	printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
			pages_to_mb(max_low_pfn));

	setup_bootmem_allocator();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
99
73.88%
2
28.57%
Tejun Heo
18
13.43%
2
28.57%
Jiang Liu
8
5.97%
1
14.29%
Tang Chen
5
3.73%
1
14.29%
Jeremy Fitzhardinge
4
2.99%
1
14.29%
Total
134
100.00%
7
100.00%

#endif /* !CONFIG_NEED_MULTIPLE_NODES */



void __init setup_bootmem_allocator(void)
{
	printk(KERN_INFO "  mapped low ram: 0 - %08lx\n",
		 max_pfn_mapped<<PAGE_SHIFT);
	printk(KERN_INFO "  low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
22
78.57%
4
80.00%
Dan Aloni
6
21.43%
1
20.00%
Total
28
100.00%
5
100.00%

/*
 * paging_init() sets up the page tables - note that the first 8MB are
 * already mapped by head.S.
 *
 * This routines also unmaps the page at virtual kernel address 0, so
 * that we can trap those pesky NULL-reference errors in the kernel.
 */


void __init paging_init(void)
{
	pagetable_init();

	__flush_tlb_all();

	kmap_init();

	/*
         * NOTE: at this point the bootmem allocator is fully available.
         */
	olpc_dt_build_devicetree();
	sparse_memory_present_with_active_regions(MAX_NUMNODES);
	sparse_init();
	zone_sizes_init();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
20
62.50%
2
33.33%
Tejun Heo
5
15.62%
1
16.67%
Dan Aloni
3
9.38%
1
16.67%
Andres Salomon
3
9.38%
1
16.67%
Linus Torvalds (pre-git)
1
3.12%
1
16.67%
Total
32
100.00%
6
100.00%

/*
 * Test if the WP bit works in supervisor mode. It isn't supported on 386's
 * and also on some strange 486's. All 586+'s are OK. This used to involve
 * black magic jumps to work around some nasty CPU bugs, but fortunately the
 * switch to using exceptions got rid of all that.
 */


static void __init test_wp_bit(void)
{
	char z = 0;

	printk(KERN_INFO "Checking if this processor honours the WP bit even in supervisor mode...");

	__set_fixmap(FIX_WP_TEST, __pa_symbol(empty_zero_page), PAGE_KERNEL_RO);

	if (probe_kernel_write((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
		clear_fixmap(FIX_WP_TEST);
		printk(KERN_CONT "Ok.\n");
		return;
	}

	printk(KERN_CONT "No.\n");
	panic("Linux doesn't support CPUs with broken WP.");
}

Contributors
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Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
33
43.42%
7
50.00%
Andrew Lutomirski
24
31.58%
1
7.14%
Borislav Petkov
11
14.47%
1
7.14%
Brian Gerst
3
3.95%
1
7.14%
Ingo Molnar
2
2.63%
1
7.14%
Adrian Bunk
1
1.32%
1
7.14%
H. Peter Anvin
1
1.32%
1
7.14%
Mathias Krause
1
1.32%
1
7.14%
Total
76
100.00%
14
100.00%



void __init mem_init(void)
{
	pci_iommu_alloc();

#ifdef CONFIG_FLATMEM
	BUG_ON(!mem_map);
#endif
	/*
         * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to
         * be done before free_all_bootmem(). Memblock use free low memory for
         * temporary data (see find_range_array()) and for this purpose can use
         * pages that was already passed to the buddy allocator, hence marked as
         * not accessible in the page tables when compiled with
         * CONFIG_DEBUG_PAGEALLOC. Otherwise order of initialization is not
         * important here.
         */
	set_highmem_pages_init();

	/* this will put all low memory onto the freelists */
	free_all_bootmem();

	after_bootmem = 1;

	mem_init_print_info(NULL);
	printk(KERN_INFO "virtual kernel memory layout:\n"
		"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#ifdef CONFIG_HIGHMEM
		"    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#endif
		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
		"      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
		"      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
		FIXADDR_START, FIXADDR_TOP,
		(FIXADDR_TOP - FIXADDR_START) >> 10,

#ifdef CONFIG_HIGHMEM
		PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
		(LAST_PKMAP*PAGE_SIZE) >> 10,
#endif

		VMALLOC_START, VMALLOC_END,
		(VMALLOC_END - VMALLOC_START) >> 20,

		(unsigned long)__va(0), (unsigned long)high_memory,
		((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,

		(unsigned long)&__init_begin, (unsigned long)&__init_end,
		((unsigned long)&__init_end -
		 (unsigned long)&__init_begin) >> 10,

		(unsigned long)&_etext, (unsigned long)&_edata,
		((unsigned long)&_edata - (unsigned long)&_etext) >> 10,

		(unsigned long)&_text, (unsigned long)&_etext,
		((unsigned long)&_etext - (unsigned long)&_text) >> 10);

	/*
         * Check boundaries twice: Some fundamental inconsistencies can
         * be detected at build time already.
         */

#define __FIXADDR_TOP (-PAGE_SIZE)
#ifdef CONFIG_HIGHMEM
	BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE	> FIXADDR_START);
	BUILD_BUG_ON(VMALLOC_END			> PKMAP_BASE);
#endif

#define high_memory (-128UL << 20)
	BUILD_BUG_ON(VMALLOC_START			>= VMALLOC_END);

#undef high_memory

#undef __FIXADDR_TOP

#ifdef CONFIG_HIGHMEM
	BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE	> FIXADDR_START);
	BUG_ON(VMALLOC_END				> PKMAP_BASE);
#endif
	BUG_ON(VMALLOC_START				>= VMALLOC_END);
	BUG_ON((unsigned long)high_memory		> VMALLOC_START);

	test_wp_bit();
}

Contributors
Person
Tokens
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Commits
CommitProp
Jeremy Fitzhardinge
235
73.21%
2
12.50%
Jan Beulich
46
14.33%
1
6.25%
Linus Torvalds (pre-git)
16
4.98%
4
25.00%
Stanislaw Gruszka
4
1.25%
1
6.25%
Yinghai Lu
4
1.25%
1
6.25%
Dan Aloni
4
1.25%
1
6.25%
Andy Whitcroft
3
0.93%
1
6.25%
Eric Sesterhenn / Snakebyte
3
0.93%
1
6.25%
Jiang Liu
2
0.62%
1
6.25%
Andrew Morton
2
0.62%
1
6.25%
Ingo Molnar
1
0.31%
1
6.25%
Dave Hansen
1
0.31%
1
6.25%
Total
321
100.00%
16
100.00%

#ifdef CONFIG_MEMORY_HOTPLUG


int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;

	return __add_pages(nid, start_pfn, nr_pages, want_memblock);
}

Contributors
Person
Tokens
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Commits
CommitProp
Dave Hansen
34
75.56%
1
16.67%
Yasunori Goto
4
8.89%
1
16.67%
Michal Hocko
3
6.67%
2
33.33%
Gary Hade
2
4.44%
1
16.67%
Dan J Williams
2
4.44%
1
16.67%
Total
45
100.00%
6
100.00%

#ifdef CONFIG_MEMORY_HOTREMOVE


int arch_remove_memory(u64 start, u64 size)
{
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;
	struct zone *zone;

	zone = page_zone(pfn_to_page(start_pfn));
	return __remove_pages(zone, start_pfn, nr_pages);
}
Contributors
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Tokens
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CommitProp
Wen Congyang
52
100.00%
1
100.00%
Total
52
100.00%
1
100.00%

#endif
#endif


int kernel_set_to_readonly __read_mostly;



void set_kernel_text_rw(void)
{
	unsigned long start = PFN_ALIGN(_text);
	unsigned long size = PFN_ALIGN(_etext) - start;

	if (!kernel_set_to_readonly)
		return;

	pr_debug("Set kernel text: %lx - %lx for read write\n",
		 start, start+size);

	set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%



void set_kernel_text_ro(void)
{
	unsigned long start = PFN_ALIGN(_text);
	unsigned long size = PFN_ALIGN(_etext) - start;

	if (!kernel_set_to_readonly)
		return;

	pr_debug("Set kernel text: %lx - %lx for read only\n",
		 start, start+size);

	set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%



static void mark_nxdata_nx(void)
{
	/*
         * When this called, init has already been executed and released,
         * so everything past _etext should be NX.
         */
	unsigned long start = PFN_ALIGN(_etext);
	/*
         * This comes from is_kernel_text upper limit. Also HPAGE where used:
         */
	unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start;

	if (__supported_pte_mask & _PAGE_NX)
		printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10);
	set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Matthieu Castet
66
98.51%
1
50.00%
Lucas De Marchi
1
1.49%
1
50.00%
Total
67
100.00%
2
100.00%



void mark_rodata_ro(void)
{
	unsigned long start = PFN_ALIGN(_text);
	unsigned long size = PFN_ALIGN(_etext) - start;

	set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
	printk(KERN_INFO "Write protecting the kernel text: %luk\n",
		size >> 10);

	kernel_set_to_readonly = 1;

#ifdef CONFIG_CPA_DEBUG
	printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n",
		start, start+size);
	set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT);

	printk(KERN_INFO "Testing CPA: write protecting again\n");
	set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
#endif

	start += size;
	size = (unsigned long)__end_rodata - start;
	set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
	printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
		size >> 10);

#ifdef CONFIG_CPA_DEBUG
	printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size);
	set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);

	printk(KERN_INFO "Testing CPA: write protecting again\n");
	set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
#endif
	mark_nxdata_nx();
	if (__supported_pte_mask & _PAGE_NX)
		debug_checkwx();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
86
44.10%
1
12.50%
Jan Beulich
49
25.13%
1
12.50%
Arjan van de Ven
38
19.49%
2
25.00%
Stephen D. Smalley
9
4.62%
1
12.50%
Ingo Molnar
6
3.08%
1
12.50%
Steven Rostedt
4
2.05%
1
12.50%
Matthieu Castet
3
1.54%
1
12.50%
Total
195
100.00%
8
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
768
21.40%
20
11.90%
Linus Torvalds (pre-git)
376
10.48%
30
17.86%
Jeremy Fitzhardinge
358
9.98%
12
7.14%
Jan Beulich
317
8.84%
4
2.38%
Ingo Molnar
282
7.86%
9
5.36%
Dan Aloni
203
5.66%
1
0.60%
Andi Kleen
155
4.32%
4
2.38%
Tejun Heo
149
4.15%
7
4.17%
Steven Rostedt
119
3.32%
1
0.60%
Ian Campbell
108
3.01%
1
0.60%
Suresh B. Siddha
96
2.68%
2
1.19%
Kirill A. Shutemov
88
2.45%
1
0.60%
Matthieu Castet
74
2.06%
1
0.60%
Pekka J Enberg
69
1.92%
5
2.98%
Wen Congyang
57
1.59%
1
0.60%
Andrew Morton
53
1.48%
9
5.36%
Brian Gerst
46
1.28%
4
2.38%
Arjan van de Ven
41
1.14%
3
1.79%
Dave Hansen
37
1.03%
2
1.19%
Zachary Amsden
26
0.72%
1
0.60%
Andrew Lutomirski
24
0.67%
1
0.60%
Borislav Petkov
15
0.42%
2
1.19%
Attilio Rao
11
0.31%
3
1.79%
Jiang Liu
11
0.31%
2
1.19%
Linus Torvalds
10
0.28%
6
3.57%
Stephen D. Smalley
9
0.25%
1
0.60%
Minfei Huang
7
0.20%
1
0.60%
Andres Salomon
6
0.17%
1
0.60%
Ingo Brueckl
6
0.17%
1
0.60%
Tang Chen
5
0.14%
1
0.60%
Adrian Bunk
5
0.14%
2
1.19%
Stanislaw Gruszka
4
0.11%
1
0.60%
Yasunori Goto
4
0.11%
1
0.60%
H. Peter Anvin
4
0.11%
2
1.19%
Keith Packard
3
0.08%
1
0.60%
Zhao Lei
3
0.08%
1
0.60%
Huang Ying
3
0.08%
2
1.19%
Eric Sesterhenn / Snakebyte
3
0.08%
1
0.60%
Michal Hocko
3
0.08%
2
1.19%
Randy Dunlap
3
0.08%
1
0.60%
Andy Whitcroft
3
0.08%
1
0.60%
Richard Henderson
3
0.08%
1
0.60%
David Shaohua Li
2
0.06%
1
0.60%
Harvey Harrison
2
0.06%
1
0.60%
Jaswinder Singh Rajput
2
0.06%
1
0.60%
Gary Hade
2
0.06%
1
0.60%
Dan J Williams
2
0.06%
1
0.60%
Tony Luck
2
0.06%
1
0.60%
Ravikiran G. Thirumalai
1
0.03%
1
0.60%
Kamezawa Hiroyuki
1
0.03%
1
0.60%
Américo Wang
1
0.03%
1
0.60%
William Lee Irwin III
1
0.03%
1
0.60%
Laura Abbott
1
0.03%
1
0.60%
Dmitri Vorobiev
1
0.03%
1
0.60%
Roman Zippel
1
0.03%
1
0.60%
Mathias Krause
1
0.03%
1
0.60%
Lucas De Marchi
1
0.03%
1
0.60%
Total
3588
100.00%
168
100.00%
Directory: arch/x86/mm

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