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![Christophe Leroy](/assets/img/avatar_default.png)
Today powerpc64 uses a set of pgtable_caches while powerpc32 uses standard pages when using 4k pages and a single pgtable_cache if using other size pages. In preparation of implementing huge pages on the 8xx, this patch replaces the specific powerpc32 handling by the 64 bits approach. This is done by: * moving 64 bits pgtable_cache_add() and pgtable_cache_init() in a new file called init-common.c * modifying pgtable_cache_init() to also handle the case without PMD * removing the 32 bits version of pgtable_cache_add() and pgtable_cache_init() * copying related header contents from 64 bits into both the book3s/32 and nohash/32 header files On the 8xx, the following cache sizes will be used: * 4k pages mode: - PGT_CACHE(10) for PGD - PGT_CACHE(3) for 512k hugepage tables * 16k pages mode: - PGT_CACHE(6) for PGD - PGT_CACHE(7) for 512k hugepage tables - PGT_CACHE(3) for 8M hugepage tables Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Scott Wood <oss@buserror.net>
397 lines
9.1 KiB
C
397 lines
9.1 KiB
C
/*
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* This file contains the routines setting up the linux page tables.
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* -- paulus
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*
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* Derived from arch/ppc/mm/init.c:
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/fixmap.h>
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#include <asm/io.h>
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#include <asm/setup.h>
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#include "mmu_decl.h"
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unsigned long ioremap_bot;
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EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */
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extern char etext[], _stext[], _sinittext[], _einittext[];
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__ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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{
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pte_t *pte;
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if (slab_is_available()) {
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pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
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} else {
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pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
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if (pte)
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clear_page(pte);
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}
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return pte;
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}
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pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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struct page *ptepage;
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gfp_t flags = GFP_KERNEL | __GFP_ZERO;
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ptepage = alloc_pages(flags, 0);
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if (!ptepage)
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return NULL;
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if (!pgtable_page_ctor(ptepage)) {
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__free_page(ptepage);
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return NULL;
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}
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return ptepage;
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}
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void __iomem *
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ioremap(phys_addr_t addr, unsigned long size)
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{
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return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap);
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void __iomem *
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ioremap_wc(phys_addr_t addr, unsigned long size)
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{
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return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_wc);
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void __iomem *
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ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
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{
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/* writeable implies dirty for kernel addresses */
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if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO)
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flags |= _PAGE_DIRTY | _PAGE_HWWRITE;
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/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
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flags &= ~(_PAGE_USER | _PAGE_EXEC);
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#ifdef _PAGE_BAP_SR
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/* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format
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* which means that we just cleared supervisor access... oops ;-) This
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* restores it
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*/
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flags |= _PAGE_BAP_SR;
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#endif
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return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_prot);
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void __iomem *
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__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
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{
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return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
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}
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void __iomem *
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__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
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void *caller)
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{
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unsigned long v, i;
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phys_addr_t p;
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int err;
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/* Make sure we have the base flags */
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if ((flags & _PAGE_PRESENT) == 0)
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flags |= pgprot_val(PAGE_KERNEL);
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/* Non-cacheable page cannot be coherent */
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if (flags & _PAGE_NO_CACHE)
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flags &= ~_PAGE_COHERENT;
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/*
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* Choose an address to map it to.
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* Once the vmalloc system is running, we use it.
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* Before then, we use space going down from IOREMAP_TOP
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* (ioremap_bot records where we're up to).
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*/
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p = addr & PAGE_MASK;
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size = PAGE_ALIGN(addr + size) - p;
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/*
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* If the address lies within the first 16 MB, assume it's in ISA
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* memory space
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*/
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if (p < 16*1024*1024)
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p += _ISA_MEM_BASE;
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#ifndef CONFIG_CRASH_DUMP
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/*
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* Don't allow anybody to remap normal RAM that we're using.
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* mem_init() sets high_memory so only do the check after that.
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*/
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if (slab_is_available() && (p < virt_to_phys(high_memory)) &&
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!(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) {
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printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n",
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(unsigned long long)p, __builtin_return_address(0));
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return NULL;
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}
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#endif
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if (size == 0)
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return NULL;
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/*
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* Is it already mapped? Perhaps overlapped by a previous
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* mapping.
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*/
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v = p_block_mapped(p);
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if (v)
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goto out;
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if (slab_is_available()) {
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struct vm_struct *area;
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area = get_vm_area_caller(size, VM_IOREMAP, caller);
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if (area == 0)
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return NULL;
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area->phys_addr = p;
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v = (unsigned long) area->addr;
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} else {
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v = (ioremap_bot -= size);
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}
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/*
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* Should check if it is a candidate for a BAT mapping
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*/
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err = 0;
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for (i = 0; i < size && err == 0; i += PAGE_SIZE)
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err = map_page(v+i, p+i, flags);
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if (err) {
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if (slab_is_available())
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vunmap((void *)v);
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return NULL;
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}
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out:
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return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
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}
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EXPORT_SYMBOL(__ioremap);
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void iounmap(volatile void __iomem *addr)
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{
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/*
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* If mapped by BATs then there is nothing to do.
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* Calling vfree() generates a benign warning.
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*/
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if (v_block_mapped((unsigned long)addr))
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return;
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if (addr > high_memory && (unsigned long) addr < ioremap_bot)
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vunmap((void *) (PAGE_MASK & (unsigned long)addr));
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}
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EXPORT_SYMBOL(iounmap);
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int map_page(unsigned long va, phys_addr_t pa, int flags)
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{
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pmd_t *pd;
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pte_t *pg;
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int err = -ENOMEM;
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/* Use upper 10 bits of VA to index the first level map */
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pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
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/* Use middle 10 bits of VA to index the second-level map */
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pg = pte_alloc_kernel(pd, va);
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if (pg != 0) {
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err = 0;
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/* The PTE should never be already set nor present in the
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* hash table
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*/
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BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) &&
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flags);
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set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
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__pgprot(flags)));
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}
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smp_wmb();
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return err;
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}
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/*
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* Map in a chunk of physical memory starting at start.
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*/
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void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
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{
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unsigned long v, s, f;
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phys_addr_t p;
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int ktext;
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s = offset;
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v = PAGE_OFFSET + s;
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p = memstart_addr + s;
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for (; s < top; s += PAGE_SIZE) {
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ktext = ((char *)v >= _stext && (char *)v < etext) ||
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((char *)v >= _sinittext && (char *)v < _einittext);
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f = ktext ? pgprot_val(PAGE_KERNEL_TEXT) : pgprot_val(PAGE_KERNEL);
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map_page(v, p, f);
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#ifdef CONFIG_PPC_STD_MMU_32
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if (ktext)
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hash_preload(&init_mm, v, 0, 0x300);
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#endif
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v += PAGE_SIZE;
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p += PAGE_SIZE;
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}
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}
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void __init mapin_ram(void)
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{
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unsigned long s, top;
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#ifndef CONFIG_WII
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top = total_lowmem;
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s = mmu_mapin_ram(top);
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__mapin_ram_chunk(s, top);
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#else
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if (!wii_hole_size) {
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s = mmu_mapin_ram(total_lowmem);
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__mapin_ram_chunk(s, total_lowmem);
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} else {
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top = wii_hole_start;
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s = mmu_mapin_ram(top);
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__mapin_ram_chunk(s, top);
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top = memblock_end_of_DRAM();
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s = wii_mmu_mapin_mem2(top);
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__mapin_ram_chunk(s, top);
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}
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#endif
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}
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/* Scan the real Linux page tables and return a PTE pointer for
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* a virtual address in a context.
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* Returns true (1) if PTE was found, zero otherwise. The pointer to
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* the PTE pointer is unmodified if PTE is not found.
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*/
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int
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get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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int retval = 0;
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pgd = pgd_offset(mm, addr & PAGE_MASK);
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if (pgd) {
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pud = pud_offset(pgd, addr & PAGE_MASK);
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if (pud && pud_present(*pud)) {
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pmd = pmd_offset(pud, addr & PAGE_MASK);
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if (pmd_present(*pmd)) {
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pte = pte_offset_map(pmd, addr & PAGE_MASK);
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if (pte) {
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retval = 1;
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*ptep = pte;
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if (pmdp)
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*pmdp = pmd;
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/* XXX caller needs to do pte_unmap, yuck */
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}
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}
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}
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}
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return(retval);
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}
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#ifdef CONFIG_DEBUG_PAGEALLOC
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static int __change_page_attr(struct page *page, pgprot_t prot)
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{
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pte_t *kpte;
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pmd_t *kpmd;
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unsigned long address;
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BUG_ON(PageHighMem(page));
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address = (unsigned long)page_address(page);
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if (v_block_mapped(address))
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return 0;
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if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
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return -EINVAL;
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__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
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wmb();
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flush_tlb_page(NULL, address);
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pte_unmap(kpte);
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return 0;
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}
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/*
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* Change the page attributes of an page in the linear mapping.
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*
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* THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY
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*/
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static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
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{
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int i, err = 0;
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unsigned long flags;
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local_irq_save(flags);
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for (i = 0; i < numpages; i++, page++) {
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err = __change_page_attr(page, prot);
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if (err)
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break;
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}
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local_irq_restore(flags);
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return err;
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}
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void __kernel_map_pages(struct page *page, int numpages, int enable)
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{
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if (PageHighMem(page))
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return;
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change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
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}
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#endif /* CONFIG_DEBUG_PAGEALLOC */
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static int fixmaps;
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void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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BUG();
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return;
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}
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map_page(address, phys, pgprot_val(flags));
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fixmaps++;
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}
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void __this_fixmap_does_not_exist(void)
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{
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WARN_ON(1);
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}
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