Release 4.10 arch/powerpc/mm/pgtable_32.c

Directory: arch/powerpc/mm
/*
 * This file contains the routines setting up the linux page tables.
 *  -- paulus
 *
 *  Derived from arch/ppc/mm/init.c:
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
 *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
 *    Copyright (C) 1996 Paul Mackerras
 *
 *  Derived from "arch/i386/mm/init.c"
 *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/memblock.h>
#include <linux/slab.h>

#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
#include <asm/io.h>
#include <asm/setup.h>

#include "mmu_decl.h"


unsigned long ioremap_bot;

EXPORT_SYMBOL(ioremap_bot);	
/* aka VMALLOC_END */

extern char etext[], _stext[], _sinittext[], _einittext[];



__ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
	pte_t *pte;

	if (slab_is_available()) {
		pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
	} else {
		pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
		if (pte)
			clear_page(pte);
	}
	return pte;
}

Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 55 82.09% 1 25.00%
anton blanchard anton blanchard 9 13.43% 1 25.00%
michael ellerman michael ellerman 2 2.99% 1 25.00%
fabian frederick fabian frederick 1 1.49% 1 25.00%
Total 67 100.00% 4 100.00%



pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
	struct page *ptepage;

	gfp_t flags = GFP_KERNEL | __GFP_ZERO;

	ptepage = alloc_pages(flags, 0);
	if (!ptepage)
		return NULL;
	if (!pgtable_page_ctor(ptepage)) {
		__free_page(ptepage);
		return NULL;
	}
	return ptepage;
}

Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 44 68.75% 2 50.00%
kirill a. shutemov kirill a. shutemov 13 20.31% 1 25.00%
martin schwidefsky martin schwidefsky 7 10.94% 1 25.00%
Total 64 100.00% 4 100.00%


void __iomem *

ioremap(phys_addr_t addr, unsigned long size)
{
	return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
				__builtin_return_address(0));
}
Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 23 74.19% 1 33.33%
benjamin herrenschmidt benjamin herrenschmidt 8 25.81% 2 66.67%
Total 31 100.00% 3 100.00%


EXPORT_SYMBOL(ioremap);


void __iomem *

ioremap_wc(phys_addr_t addr, unsigned long size)
{
	return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
				__builtin_return_address(0));
}
Contributors
Person Tokens Prop Commits CommitProp
anton blanchard anton blanchard 26 89.66% 1 50.00%
paul mackerras paul mackerras 3 10.34% 1 50.00%
Total 29 100.00% 2 100.00%


EXPORT_SYMBOL(ioremap_wc);


void __iomem *

ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
{
	/* writeable implies dirty for kernel addresses */
	if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO)
		flags |= _PAGE_DIRTY | _PAGE_HWWRITE;

	/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
	flags &= ~(_PAGE_USER | _PAGE_EXEC);

#ifdef _PAGE_BAP_SR
	/* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format
         * which means that we just cleared supervisor access... oops ;-) This
         * restores it
         */
	flags |= _PAGE_BAP_SR;
#endif

	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}
Contributors
Person Tokens Prop Commits CommitProp
benjamin herrenschmidt benjamin herrenschmidt 62 83.78% 4 57.14%
christophe leroy christophe leroy 8 10.81% 1 14.29%
anton blanchard anton blanchard 4 5.41% 2 28.57%
Total 74 100.00% 7 100.00%


EXPORT_SYMBOL(ioremap_prot);


void __iomem *

__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
{
	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}

Contributors
Person Tokens Prop Commits CommitProp
benjamin herrenschmidt benjamin herrenschmidt 19 57.58% 2 66.67%
paul mackerras paul mackerras 14 42.42% 1 33.33%
Total 33 100.00% 3 100.00%


void __iomem *

__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
		 void *caller)
{
	unsigned long v, i;
	phys_addr_t p;
	int err;

	/* Make sure we have the base flags */
	if ((flags & _PAGE_PRESENT) == 0)
		flags |= pgprot_val(PAGE_KERNEL);

	/* Non-cacheable page cannot be coherent */
	if (flags & _PAGE_NO_CACHE)
		flags &= ~_PAGE_COHERENT;

	/*
         * Choose an address to map it to.
         * Once the vmalloc system is running, we use it.
         * Before then, we use space going down from IOREMAP_TOP
         * (ioremap_bot records where we're up to).
         */
	p = addr & PAGE_MASK;
	size = PAGE_ALIGN(addr + size) - p;

	/*
         * If the address lies within the first 16 MB, assume it's in ISA
         * memory space
         */
	if (p < 16*1024*1024)
		p += _ISA_MEM_BASE;

#ifndef CONFIG_CRASH_DUMP
	/*
         * Don't allow anybody to remap normal RAM that we're using.
         * mem_init() sets high_memory so only do the check after that.
         */
	if (slab_is_available() && (p < virt_to_phys(high_memory)) &&
	    !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) {
		printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n",
		       (unsigned long long)p, __builtin_return_address(0));
		return NULL;
	}
#endif

	if (size == 0)
		return NULL;

	/*
         * Is it already mapped?  Perhaps overlapped by a previous
         * mapping.
         */
	v = p_block_mapped(p);
	if (v)
		goto out;

	if (slab_is_available()) {
		struct vm_struct *area;
		area = get_vm_area_caller(size, VM_IOREMAP, caller);
		if (area == 0)
			return NULL;
		area->phys_addr = p;
		v = (unsigned long) area->addr;
	} else {
		v = (ioremap_bot -= size);
	}

	/*
         * Should check if it is a candidate for a BAT mapping
         */

	err = 0;
	for (i = 0; i < size && err == 0; i += PAGE_SIZE)
		err = map_page(v+i, p+i, flags);
	if (err) {
		if (slab_is_available())
			vunmap((void *)v);
		return NULL;
	}

out:
	return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
}
Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 225 70.75% 1 7.14%
benjamin herrenschmidt benjamin herrenschmidt 51 16.04% 3 21.43%
michael ellerman michael ellerman 15 4.72% 3 21.43%
albert herranz albert herranz 11 3.46% 1 7.14%
david gibson david gibson 5 1.57% 1 7.14%
anton vorontsov anton vorontsov 5 1.57% 1 7.14%
christophe leroy christophe leroy 4 1.26% 2 14.29%
scott wood scott wood 1 0.31% 1 7.14%
yinghai lu yinghai lu 1 0.31% 1 7.14%
Total 318 100.00% 14 100.00%


EXPORT_SYMBOL(__ioremap);



void iounmap(volatile void __iomem *addr)
{
	/*
         * If mapped by BATs then there is nothing to do.
         * Calling vfree() generates a benign warning.
         */
	if (v_block_mapped((unsigned long)addr))
		return;

	if (addr > high_memory && (unsigned long) addr < ioremap_bot)
		vunmap((void *) (PAGE_MASK & (unsigned long)addr));
}
Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 54 98.18% 1 50.00%
christophe leroy christophe leroy 1 1.82% 1 50.00%
Total 55 100.00% 2 100.00%


EXPORT_SYMBOL(iounmap);



int map_page(unsigned long va, phys_addr_t pa, int flags)
{
	pmd_t *pd;
	pte_t *pg;
	int err = -ENOMEM;

	/* Use upper 10 bits of VA to index the first level map */
	pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
	/* Use middle 10 bits of VA to index the second-level map */
	pg = pte_alloc_kernel(pd, va);
	if (pg != 0) {
		err = 0;
		/* The PTE should never be already set nor present in the
                 * hash table
                 */
		BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) &&
		       flags);
		set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
						     __pgprot(flags)));
	}
	smp_wmb();
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 88 75.21% 1 16.67%
benjamin herrenschmidt benjamin herrenschmidt 17 14.53% 2 33.33%
david gibson david gibson 5 4.27% 1 16.67%
anton vorontsov anton vorontsov 4 3.42% 1 16.67%
scott wood scott wood 3 2.56% 1 16.67%
Total 117 100.00% 6 100.00%

/*
 * Map in a chunk of physical memory starting at start.
 */


void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
{
	unsigned long v, s, f;
	phys_addr_t p;
	int ktext;

	s = offset;
	v = PAGE_OFFSET + s;
	p = memstart_addr + s;
	for (; s < top; s += PAGE_SIZE) {
		ktext = ((char *)v >= _stext && (char *)v < etext) ||
			((char *)v >= _sinittext && (char *)v < _einittext);
		f = ktext ? pgprot_val(PAGE_KERNEL_TEXT) : pgprot_val(PAGE_KERNEL);
		map_page(v, p, f);
#ifdef CONFIG_PPC_STD_MMU_32
		if (ktext)
			hash_preload(&init_mm, v, 0, 0x300);
#endif
		v += PAGE_SIZE;
		p += PAGE_SIZE;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 75 51.02% 1 12.50%
benjamin herrenschmidt benjamin herrenschmidt 33 22.45% 2 25.00%
christophe leroy christophe leroy 18 12.24% 1 12.50%
albert herranz albert herranz 10 6.80% 1 12.50%
michael ellerman michael ellerman 6 4.08% 1 12.50%
kumar gala kumar gala 4 2.72% 1 12.50%
dale farnsworth dale farnsworth 1 0.68% 1 12.50%
Total 147 100.00% 8 100.00%



void __init mapin_ram(void)
{
	unsigned long s, top;

#ifndef CONFIG_WII
	top = total_lowmem;
	s = mmu_mapin_ram(top);
	__mapin_ram_chunk(s, top);
#else
	if (!wii_hole_size) {
		s = mmu_mapin_ram(total_lowmem);
		__mapin_ram_chunk(s, total_lowmem);
	} else {
		top = wii_hole_start;
		s = mmu_mapin_ram(top);
		__mapin_ram_chunk(s, top);

		top = memblock_end_of_DRAM();
		s = wii_mmu_mapin_mem2(top);
		__mapin_ram_chunk(s, top);
	}
#endif
}

Contributors
Person Tokens Prop Commits CommitProp
albert herranz albert herranz 99 99.00% 1 50.00%
yinghai lu yinghai lu 1 1.00% 1 50.00%
Total 100 100.00% 2 100.00%

/* Scan the real Linux page tables and return a PTE pointer for
 * a virtual address in a context.
 * Returns true (1) if PTE was found, zero otherwise.  The pointer to
 * the PTE pointer is unmodified if PTE is not found.
 */

int

get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
{
        pgd_t	*pgd;
	pud_t	*pud;
        pmd_t	*pmd;
        pte_t	*pte;
        int     retval = 0;

        pgd = pgd_offset(mm, addr & PAGE_MASK);
        if (pgd) {
		pud = pud_offset(pgd, addr & PAGE_MASK);
		if (pud && pud_present(*pud)) {
			pmd = pmd_offset(pud, addr & PAGE_MASK);
			if (pmd_present(*pmd)) {
				pte = pte_offset_map(pmd, addr & PAGE_MASK);
				if (pte) {
					retval = 1;
					*ptep = pte;
					if (pmdp)
						*pmdp = pmd;
					/* XXX caller needs to do pte_unmap, yuck */
				}
			}
		}
        }
        return(retval);
}

Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 105 71.43% 1 33.33%
david gibson david gibson 28 19.05% 1 33.33%
eugene surovegin eugene surovegin 14 9.52% 1 33.33%
Total 147 100.00% 3 100.00%

#ifdef CONFIG_DEBUG_PAGEALLOC



static int __change_page_attr(struct page *page, pgprot_t prot)
{
	pte_t *kpte;
	pmd_t *kpmd;
	unsigned long address;

	BUG_ON(PageHighMem(page));
	address = (unsigned long)page_address(page);

	if (v_block_mapped(address))
		return 0;
	if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
		return -EINVAL;
	__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
	wmb();
	flush_tlb_page(NULL, address);
	pte_unmap(kpte);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
benjamin herrenschmidt benjamin herrenschmidt 112 99.12% 3 75.00%
christophe leroy christophe leroy 1 0.88% 1 25.00%
Total 113 100.00% 4 100.00%

/*
 * Change the page attributes of an page in the linear mapping.
 *
 * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY
 */


static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
{
	int i, err = 0;
	unsigned long flags;

	local_irq_save(flags);
	for (i = 0; i < numpages; i++, page++) {
		err = __change_page_attr(page, prot);
		if (err)
			break;
	}
	local_irq_restore(flags);
	return err;
}


Contributors
Person Tokens Prop Commits CommitProp
benjamin herrenschmidt benjamin herrenschmidt 73 100.00% 1 100.00%
Total 73 100.00% 1 100.00%



void __kernel_map_pages(struct page *page, int numpages, int enable)
{
	if (PageHighMem(page))
		return;

	change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
}
Contributors
Person Tokens Prop Commits CommitProp
benjamin herrenschmidt benjamin herrenschmidt 39 97.50% 1 50.00%
joonsoo kim joonsoo kim 1 2.50% 1 50.00%
Total 40 100.00% 2 100.00%

#endif /* CONFIG_DEBUG_PAGEALLOC */


static int fixmaps;



void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
{
	unsigned long address = __fix_to_virt(idx);

	if (idx >= __end_of_fixed_addresses) {
		BUG();
		return;
	}

	map_page(address, phys, pgprot_val(flags));
	fixmaps++;
}

Contributors
Person Tokens Prop Commits CommitProp
kumar gala kumar gala 48 94.12% 1 50.00%
david gibson david gibson 3 5.88% 1 50.00%
Total 51 100.00% 2 100.00%



void __this_fixmap_does_not_exist(void)
{
	WARN_ON(1);
}
Contributors
Person Tokens Prop Commits CommitProp
kumar gala kumar gala 12 100.00% 1 100.00%
Total 12 100.00% 1 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
paul mackerras paul mackerras 732 46.36% 2 4.55%
benjamin herrenschmidt benjamin herrenschmidt 425 26.92% 10 22.73%
albert herranz albert herranz 123 7.79% 2 4.55%
kumar gala kumar gala 71 4.50% 2 4.55%
anton blanchard anton blanchard 45 2.85% 3 6.82%
david gibson david gibson 42 2.66% 4 9.09%
christophe leroy christophe leroy 38 2.41% 4 9.09%
michael ellerman michael ellerman 23 1.46% 3 6.82%
olaf hering olaf hering 21 1.33% 1 2.27%
eugene surovegin eugene surovegin 14 0.89% 1 2.27%
kirill a. shutemov kirill a. shutemov 13 0.82% 1 2.27%
anton vorontsov anton vorontsov 9 0.57% 2 4.55%
martin schwidefsky martin schwidefsky 7 0.44% 1 2.27%
scott wood scott wood 4 0.25% 2 4.55%
david howells david howells 3 0.19% 1 2.27%
tejun heo tejun heo 3 0.19% 1 2.27%
yinghai lu yinghai lu 3 0.19% 1 2.27%
dale farnsworth dale farnsworth 1 0.06% 1 2.27%
fabian frederick fabian frederick 1 0.06% 1 2.27%
joonsoo kim joonsoo kim 1 0.06% 1 2.27%
Total 1579 100.00% 44 100.00%
Directory: arch/powerpc/mm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
paul mackerras	paul mackerras	55	82.09%	1	25.00%
anton blanchard	anton blanchard	9	13.43%	1	25.00%
michael ellerman	michael ellerman	2	2.99%	1	25.00%
fabian frederick	fabian frederick	1	1.49%	1	25.00%
	Total	67	100.00%	4	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 arch/powerpc/mm/pgtable_32.c

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