/* * This file contains ioremap and related functions for 64-bit machines. * * Derived from arch/ppc64/mm/init.c * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Modifications by Paul Mackerras (PowerMac) (paulus@samba.org) * 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 * * Dave Engebretsen * Rework for PPC64 port. * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_PPC_BOOK3S_64 /* * partition table and process table for ISA 3.0 */ struct prtb_entry *process_tb; struct patb_entry *partition_tb; /* * page table size */ unsigned long __pte_index_size; EXPORT_SYMBOL(__pte_index_size); unsigned long __pmd_index_size; EXPORT_SYMBOL(__pmd_index_size); unsigned long __pud_index_size; EXPORT_SYMBOL(__pud_index_size); unsigned long __pgd_index_size; EXPORT_SYMBOL(__pgd_index_size); unsigned long __pud_cache_index; EXPORT_SYMBOL(__pud_cache_index); unsigned long __pte_table_size; EXPORT_SYMBOL(__pte_table_size); unsigned long __pmd_table_size; EXPORT_SYMBOL(__pmd_table_size); unsigned long __pud_table_size; EXPORT_SYMBOL(__pud_table_size); unsigned long __pgd_table_size; EXPORT_SYMBOL(__pgd_table_size); unsigned long __pmd_val_bits; EXPORT_SYMBOL(__pmd_val_bits); unsigned long __pud_val_bits; EXPORT_SYMBOL(__pud_val_bits); unsigned long __pgd_val_bits; EXPORT_SYMBOL(__pgd_val_bits); unsigned long __kernel_virt_start; EXPORT_SYMBOL(__kernel_virt_start); unsigned long __vmalloc_start; EXPORT_SYMBOL(__vmalloc_start); unsigned long __vmalloc_end; EXPORT_SYMBOL(__vmalloc_end); unsigned long __kernel_io_start; EXPORT_SYMBOL(__kernel_io_start); unsigned long __kernel_io_end; struct page *vmemmap; EXPORT_SYMBOL(vmemmap); unsigned long __pte_frag_nr; EXPORT_SYMBOL(__pte_frag_nr); unsigned long __pte_frag_size_shift; EXPORT_SYMBOL(__pte_frag_size_shift); unsigned long ioremap_bot; #else /* !CONFIG_PPC_BOOK3S_64 */ unsigned long ioremap_bot = IOREMAP_BASE; #endif /** * __ioremap_at - Low level function to establish the page tables * for an IO mapping */ void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot) { unsigned long i; /* We don't support the 4K PFN hack with ioremap */ if (pgprot_val(prot) & H_PAGE_4K_PFN) return NULL; if ((ea + size) >= (void *)IOREMAP_END) { pr_warn("Outside the supported range\n"); return NULL; } WARN_ON(pa & ~PAGE_MASK); WARN_ON(((unsigned long)ea) & ~PAGE_MASK); WARN_ON(size & ~PAGE_MASK); for (i = 0; i < size; i += PAGE_SIZE) if (map_kernel_page((unsigned long)ea + i, pa + i, prot)) return NULL; return (void __iomem *)ea; } /** * __iounmap_from - Low level function to tear down the page tables * for an IO mapping. This is used for mappings that * are manipulated manually, like partial unmapping of * PCI IOs or ISA space. */ void __iounmap_at(void *ea, unsigned long size) { WARN_ON(((unsigned long)ea) & ~PAGE_MASK); WARN_ON(size & ~PAGE_MASK); unmap_kernel_range((unsigned long)ea, size); } void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *caller) { phys_addr_t paligned; void __iomem *ret; /* * Choose an address to map it to. * Once the imalloc system is running, we use it. * Before that, we map using addresses going * up from ioremap_bot. imalloc will use * the addresses from ioremap_bot through * IMALLOC_END * */ paligned = addr & PAGE_MASK; size = PAGE_ALIGN(addr + size) - paligned; if ((size == 0) || (paligned == 0)) return NULL; if (slab_is_available()) { struct vm_struct *area; area = __get_vm_area_caller(size, VM_IOREMAP, ioremap_bot, IOREMAP_END, caller); if (area == NULL) return NULL; area->phys_addr = paligned; ret = __ioremap_at(paligned, area->addr, size, prot); if (!ret) vunmap(area->addr); } else { ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot); if (ret) ioremap_bot += size; } if (ret) ret += addr & ~PAGE_MASK; return ret; } void __iomem * __ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) { return __ioremap_caller(addr, size, __pgprot(flags), __builtin_return_address(0)); } void __iomem * ioremap(phys_addr_t addr, unsigned long size) { pgprot_t prot = pgprot_noncached(PAGE_KERNEL); void *caller = __builtin_return_address(0); if (ppc_md.ioremap) return ppc_md.ioremap(addr, size, prot, caller); return __ioremap_caller(addr, size, prot, caller); } void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size) { pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL); void *caller = __builtin_return_address(0); if (ppc_md.ioremap) return ppc_md.ioremap(addr, size, prot, caller); return __ioremap_caller(addr, size, prot, caller); } void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size) { pgprot_t prot = pgprot_cached(PAGE_KERNEL); void *caller = __builtin_return_address(0); if (ppc_md.ioremap) return ppc_md.ioremap(addr, size, prot, caller); return __ioremap_caller(addr, size, prot, caller); } void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags) { pte_t pte = __pte(flags); void *caller = __builtin_return_address(0); /* writeable implies dirty for kernel addresses */ if (pte_write(pte)) pte = pte_mkdirty(pte); /* we don't want to let _PAGE_EXEC leak out */ pte = pte_exprotect(pte); /* * Force kernel mapping. */ pte = pte_mkprivileged(pte); if (ppc_md.ioremap) return ppc_md.ioremap(addr, size, pte_pgprot(pte), caller); return __ioremap_caller(addr, size, pte_pgprot(pte), caller); } /* * Unmap an IO region and remove it from imalloc'd list. * Access to IO memory should be serialized by driver. */ void __iounmap(volatile void __iomem *token) { void *addr; if (!slab_is_available()) return; addr = (void *) ((unsigned long __force) PCI_FIX_ADDR(token) & PAGE_MASK); if ((unsigned long)addr < ioremap_bot) { printk(KERN_WARNING "Attempt to iounmap early bolted mapping" " at 0x%p\n", addr); return; } vunmap(addr); } void iounmap(volatile void __iomem *token) { if (ppc_md.iounmap) ppc_md.iounmap(token); else __iounmap(token); } EXPORT_SYMBOL(ioremap); EXPORT_SYMBOL(ioremap_wc); EXPORT_SYMBOL(ioremap_prot); EXPORT_SYMBOL(__ioremap); EXPORT_SYMBOL(__ioremap_at); EXPORT_SYMBOL(iounmap); EXPORT_SYMBOL(__iounmap); EXPORT_SYMBOL(__iounmap_at); #ifndef __PAGETABLE_PUD_FOLDED /* 4 level page table */ struct page *pgd_page(pgd_t pgd) { if (pgd_huge(pgd)) return pte_page(pgd_pte(pgd)); return virt_to_page(pgd_page_vaddr(pgd)); } #endif struct page *pud_page(pud_t pud) { if (pud_huge(pud)) return pte_page(pud_pte(pud)); return virt_to_page(pud_page_vaddr(pud)); } /* * For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags * For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address. */ struct page *pmd_page(pmd_t pmd) { if (pmd_large(pmd) || pmd_huge(pmd) || pmd_devmap(pmd)) return pte_page(pmd_pte(pmd)); return virt_to_page(pmd_page_vaddr(pmd)); } #ifdef CONFIG_STRICT_KERNEL_RWX void mark_rodata_ro(void) { if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) { pr_warn("Warning: Unable to mark rodata read only on this CPU.\n"); return; } if (radix_enabled()) radix__mark_rodata_ro(); else hash__mark_rodata_ro(); // mark_initmem_nx() should have already run by now ptdump_check_wx(); } void mark_initmem_nx(void) { if (radix_enabled()) radix__mark_initmem_nx(); else hash__mark_initmem_nx(); } #endif