| /* |
| * 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/lmb.h> |
| |
| #include <asm/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/fixmap.h> |
| #include <asm/io.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 = (pgd_t *)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; |
| |
| #ifdef CONFIG_HIGHPTE |
| gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT | __GFP_ZERO; |
| #else |
| gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO; |
| #endif |
| |
| 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_flags(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); |
| |
| return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); |
| } |
| EXPORT_SYMBOL(ioremap_flags); |
| |
| 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 && lmb_is_region_reserved(p, size))) { |
| printk("__ioremap(): phys addr 0x%llx is RAM lr %p\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; |
| 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 = lmb_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)); |
| wmb(); |
| #ifdef CONFIG_PPC_STD_MMU |
| flush_hash_pages(0, address, pmd_val(*kpmd), 1); |
| #else |
| flush_tlb_page(NULL, address); |
| #endif |
| 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); |
| } |