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Diffstat (limited to '')
| -rw-r--r-- | arch/ppc/mm/pgtable.c | 403 |
1 files changed, 0 insertions, 403 deletions
diff --git a/arch/ppc/mm/pgtable.c b/arch/ppc/mm/pgtable.c deleted file mode 100644 index 03a79bff1271..000000000000 --- a/arch/ppc/mm/pgtable.c +++ /dev/null @@ -1,403 +0,0 @@ -/* - * 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 - * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). - * - * 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 <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/io.h> - -#include "mmu_decl.h" - -unsigned long ioremap_base; -unsigned long ioremap_bot; -int io_bat_index; - -#if defined(CONFIG_6xx) -#define HAVE_BATS 1 -#endif - -extern char etext[], _stext[]; - -#ifdef CONFIG_SMP -extern void hash_page_sync(void); -#endif - -#ifdef HAVE_BATS -extern unsigned long v_mapped_by_bats(unsigned long va); -extern unsigned long p_mapped_by_bats(unsigned long pa); -void setbat(int index, unsigned long virt, unsigned long phys, - unsigned int size, int flags); - -#else /* !HAVE_BATS */ -#define v_mapped_by_bats(x) (0UL) -#define p_mapped_by_bats(x) (0UL) -#endif /* HAVE_BATS */ - -#ifdef CONFIG_PTE_64BIT -/* 44x uses an 8kB pgdir because it has 8-byte Linux PTEs. */ -#define PGDIR_ORDER 1 -#else -#define PGDIR_ORDER 0 -#endif - -pgd_t *pgd_alloc(struct mm_struct *mm) -{ - pgd_t *ret; - - ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, PGDIR_ORDER); - return ret; -} - -void pgd_free(struct mm_struct *mm, pgd_t *pgd) -{ - free_pages((unsigned long)pgd, PGDIR_ORDER); -} - -__init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) -{ - pte_t *pte; - extern int mem_init_done; - extern void *early_get_page(void); - - if (mem_init_done) { - pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); - } else { - pte = (pte_t *)early_get_page(); - if (pte) - clear_page(pte); - } - return pte; -} - -pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) -{ - struct page *ptepage; - -#ifdef CONFIG_HIGHPTE - gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT; -#else - gfp_t flags = GFP_KERNEL | __GFP_REPEAT; -#endif - - ptepage = alloc_pages(flags, 0); - if (ptepage) { - clear_highpage(ptepage); - pgtable_page_ctor(ptepage); - } - return ptepage; -} - -void pte_free_kernel(struct mm_struct *mm, pte_t *pte) -{ -#ifdef CONFIG_SMP - hash_page_sync(); -#endif - free_page((unsigned long)pte); -} - -void pte_free(struct mm_struct *mm, pgtable_t ptepage) -{ -#ifdef CONFIG_SMP - hash_page_sync(); -#endif - pgtable_page_dtor(ptepage); - __free_page(ptepage); -} - -#ifndef CONFIG_PHYS_64BIT -void __iomem * -ioremap(phys_addr_t addr, unsigned long size) -{ - return __ioremap(addr, size, _PAGE_NO_CACHE); -} -#else /* CONFIG_PHYS_64BIT */ -void __iomem * -ioremap64(unsigned long long addr, unsigned long size) -{ - return __ioremap(addr, size, _PAGE_NO_CACHE); -} - -void __iomem * -ioremap(phys_addr_t addr, unsigned long size) -{ - phys_addr_t addr64 = fixup_bigphys_addr(addr, size); - - return ioremap64(addr64, size); -} -#endif /* CONFIG_PHYS_64BIT */ - -void __iomem * -__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) -{ - unsigned long v, i; - phys_addr_t p; - int err; - - /* - * 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_base - * (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; - - /* - * 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 ( mem_init_done && (p < virt_to_phys(high_memory)) ) - { - printk("__ioremap(): phys addr "PHYS_FMT" is RAM lr %p\n", p, - __builtin_return_address(0)); - return NULL; - } - - if (size == 0) - return NULL; - - /* - * Is it already mapped? Perhaps overlapped by a previous - * BAT mapping. If the whole area is mapped then we're done, - * otherwise remap it since we want to keep the virt addrs for - * each request contiguous. - * - * We make the assumption here that if the bottom and top - * of the range we want are mapped then it's mapped to the - * same virt address (and this is contiguous). - * -- Cort - */ - if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ ) - goto out; - - if (mem_init_done) { - struct vm_struct *area; - area = get_vm_area(size, VM_IOREMAP); - if (area == 0) - return NULL; - v = (unsigned long) area->addr; - } else { - v = (ioremap_bot -= size); - } - - if ((flags & _PAGE_PRESENT) == 0) - flags |= _PAGE_KERNEL; - if (flags & _PAGE_NO_CACHE) - flags |= _PAGE_GUARDED; - - /* - * 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 (mem_init_done) - vunmap((void *)v); - return NULL; - } - -out: - return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); -} - -void iounmap(volatile void __iomem *addr) -{ - /* - * If mapped by BATs then there is nothing to do. - * Calling vfree() generates a benign warning. - */ - if (v_mapped_by_bats((unsigned long)addr)) return; - - if (addr > high_memory && (unsigned long) addr < ioremap_bot) - vunmap((void *) (PAGE_MASK & (unsigned long)addr)); -} - -void __iomem *ioport_map(unsigned long port, unsigned int len) -{ - return (void __iomem *) (port + _IO_BASE); -} - -void ioport_unmap(void __iomem *addr) -{ - /* Nothing to do */ -} -EXPORT_SYMBOL(ioport_map); -EXPORT_SYMBOL(ioport_unmap); - -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(pgd_offset_k(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; - set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags))); - if (mem_init_done) - flush_HPTE(0, va, pmd_val(*pd)); - } - return err; -} - -/* - * Map in all of physical memory starting at KERNELBASE. - */ -void __init mapin_ram(void) -{ - unsigned long v, p, s, f; - - s = mmu_mapin_ram(); - v = KERNELBASE + s; - p = PPC_MEMSTART + s; - for (; s < total_lowmem; s += PAGE_SIZE) { - if ((char *) v >= _stext && (char *) v < etext) - f = _PAGE_RAM_TEXT; - else - f = _PAGE_RAM; - map_page(v, p, f); - v += PAGE_SIZE; - p += PAGE_SIZE; - } -} - -/* is x a power of 4? */ -#define is_power_of_4(x) is_power_of_2(x) && (ffs(x) & 1) - -/* - * Set up a mapping for a block of I/O. - * virt, phys, size must all be page-aligned. - * This should only be called before ioremap is called. - */ -void __init io_block_mapping(unsigned long virt, phys_addr_t phys, - unsigned int size, int flags) -{ - int i; - - if (virt > KERNELBASE && virt < ioremap_bot) - ioremap_bot = ioremap_base = virt; - -#ifdef HAVE_BATS - /* - * Use a BAT for this if possible... - */ - if (io_bat_index < 2 && is_power_of_2(size) - && (virt & (size - 1)) == 0 && (phys & (size - 1)) == 0) { - setbat(io_bat_index, virt, phys, size, flags); - ++io_bat_index; - return; - } -#endif /* HAVE_BATS */ - - /* No BATs available, put it in the page tables. */ - for (i = 0; i < size; i += PAGE_SIZE) - map_page(virt + i, phys + i, flags); -} - -/* 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; - pmd_t *pmd; - pte_t *pte; - int retval = 0; - - pgd = pgd_offset(mm, addr & PAGE_MASK); - if (pgd) { - pmd = pmd_offset(pgd, 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); -} - -/* Find physical address for this virtual address. Normally used by - * I/O functions, but anyone can call it. - */ -unsigned long iopa(unsigned long addr) -{ - unsigned long pa; - - /* I don't know why this won't work on PMacs or CHRP. It - * appears there is some bug, or there is some implicit - * mapping done not properly represented by BATs or in page - * tables.......I am actively working on resolving this, but - * can't hold up other stuff. -- Dan - */ - pte_t *pte; - struct mm_struct *mm; - - /* Check the BATs */ - pa = v_mapped_by_bats(addr); - if (pa) - return pa; - - /* Allow mapping of user addresses (within the thread) - * for DMA if necessary. - */ - if (addr < TASK_SIZE) - mm = current->mm; - else - mm = &init_mm; - - pa = 0; - if (get_pteptr(mm, addr, &pte, NULL)) { - pa = (pte_val(*pte) & PAGE_MASK) | (addr & ~PAGE_MASK); - pte_unmap(pte); - } - - return(pa); -} - |