diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/mm/pgtable_32.c')
-rw-r--r-- | ANDROID_3.4.5/arch/powerpc/mm/pgtable_32.c | 456 |
1 files changed, 0 insertions, 456 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/mm/pgtable_32.c b/ANDROID_3.4.5/arch/powerpc/mm/pgtable_32.c deleted file mode 100644 index 6c856fb8..00000000 --- a/ANDROID_3.4.5/arch/powerpc/mm/pgtable_32.c +++ /dev/null @@ -1,456 +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 - * - * 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_base; -unsigned long ioremap_bot; -EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ - -#if defined(CONFIG_6xx) || defined(CONFIG_POWER3) -#define HAVE_BATS 1 -#endif - -#if defined(CONFIG_FSL_BOOKE) -#define HAVE_TLBCAM 1 -#endif - -extern char etext[], _stext[]; - -#ifdef HAVE_BATS -extern phys_addr_t v_mapped_by_bats(unsigned long va); -extern unsigned long p_mapped_by_bats(phys_addr_t pa); -void setbat(int index, unsigned long virt, phys_addr_t 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 HAVE_TLBCAM -extern unsigned int tlbcam_index; -extern phys_addr_t v_mapped_by_tlbcam(unsigned long va); -extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa); -#else /* !HAVE_TLBCAM */ -#define v_mapped_by_tlbcam(x) (0UL) -#define p_mapped_by_tlbcam(x) (0UL) -#endif /* HAVE_TLBCAM */ - -#define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT) - -pgd_t *pgd_alloc(struct mm_struct *mm) -{ - pgd_t *ret; - - /* pgdir take page or two with 4K pages and a page fraction otherwise */ -#ifndef CONFIG_PPC_4K_PAGES - ret = kzalloc(1 << PGDIR_ORDER, GFP_KERNEL); -#else - ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, - PGDIR_ORDER - PAGE_SHIFT); -#endif - return ret; -} - -void pgd_free(struct mm_struct *mm, pgd_t *pgd) -{ -#ifndef CONFIG_PPC_4K_PAGES - kfree((void *)pgd); -#else - free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT); -#endif -} - -__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; - - gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO; - - ptepage = alloc_pages(flags, 0); - if (!ptepage) - return NULL; - pgtable_page_ctor(ptepage); - return ptepage; -} - -void __iomem * -ioremap(phys_addr_t addr, unsigned long size) -{ - return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED, - __builtin_return_address(0)); -} -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)); -} -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) - 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)); -} -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)); -} - -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 |= 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_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; - -#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 (mem_init_done && (p < virt_to_phys(high_memory)) && - !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) { - printk("__ioremap(): phys addr 0x%llx is RAM lr %pf\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 - * 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 ((v = p_mapped_by_tlbcam(p))) - goto out; - - if (mem_init_done) { - 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 (mem_init_done) - vunmap((void *)v); - return NULL; - } - -out: - return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); -} -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_mapped_by_bats((unsigned long)addr)) return; - - if (addr > high_memory && (unsigned long) addr < ioremap_bot) - vunmap((void *) (PAGE_MASK & (unsigned long)addr)); -} -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))); - } - return err; -} - -/* - * 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); - f = ktext ? PAGE_KERNEL_TEXT : 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; - } -} - -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 -} - -/* 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); -} - -#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_mapped_by_bats(address) || v_mapped_by_tlbcam(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; -} - -/* - * 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; -} - - -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)); -} -#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++; -} - -void __this_fixmap_does_not_exist(void) -{ - WARN_ON(1); -} |