2 * This file contains ioremap and related functions for 64-bit machines.
4 * Derived from arch/ppc64/mm/init.c
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
8 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
9 * Copyright (C) 1996 Paul Mackerras
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
14 * Dave Engebretsen <engebret@us.ibm.com>
15 * Rework for PPC64 port.
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
24 #include <linux/signal.h>
25 #include <linux/sched.h>
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
28 #include <linux/string.h>
29 #include <linux/export.h>
30 #include <linux/types.h>
31 #include <linux/mman.h>
33 #include <linux/swap.h>
34 #include <linux/stddef.h>
35 #include <linux/vmalloc.h>
36 #include <linux/memblock.h>
37 #include <linux/slab.h>
38 #include <linux/hugetlb.h>
40 #include <asm/pgalloc.h>
44 #include <asm/mmu_context.h>
45 #include <asm/pgtable.h>
48 #include <asm/machdep.h>
50 #include <asm/trace.h>
51 #include <asm/processor.h>
52 #include <asm/cputable.h>
53 #include <asm/sections.h>
54 #include <asm/firmware.h>
56 #include <asm/powernv.h>
60 #ifdef CONFIG_PPC_BOOK3S_64
61 #if TASK_SIZE_USER64 > (1UL << (ESID_BITS + SID_SHIFT))
62 #error TASK_SIZE_USER64 exceeds user VSID range
66 #ifdef CONFIG_PPC_BOOK3S_64
68 * partition table and process table for ISA 3.0
70 struct prtb_entry *process_tb;
71 struct patb_entry *partition_tb;
75 unsigned long __pte_index_size;
76 EXPORT_SYMBOL(__pte_index_size);
77 unsigned long __pmd_index_size;
78 EXPORT_SYMBOL(__pmd_index_size);
79 unsigned long __pud_index_size;
80 EXPORT_SYMBOL(__pud_index_size);
81 unsigned long __pgd_index_size;
82 EXPORT_SYMBOL(__pgd_index_size);
83 unsigned long __pmd_cache_index;
84 EXPORT_SYMBOL(__pmd_cache_index);
85 unsigned long __pud_cache_index;
86 EXPORT_SYMBOL(__pud_cache_index);
87 unsigned long __pte_table_size;
88 EXPORT_SYMBOL(__pte_table_size);
89 unsigned long __pmd_table_size;
90 EXPORT_SYMBOL(__pmd_table_size);
91 unsigned long __pud_table_size;
92 EXPORT_SYMBOL(__pud_table_size);
93 unsigned long __pgd_table_size;
94 EXPORT_SYMBOL(__pgd_table_size);
95 unsigned long __pmd_val_bits;
96 EXPORT_SYMBOL(__pmd_val_bits);
97 unsigned long __pud_val_bits;
98 EXPORT_SYMBOL(__pud_val_bits);
99 unsigned long __pgd_val_bits;
100 EXPORT_SYMBOL(__pgd_val_bits);
101 unsigned long __kernel_virt_start;
102 EXPORT_SYMBOL(__kernel_virt_start);
103 unsigned long __kernel_virt_size;
104 EXPORT_SYMBOL(__kernel_virt_size);
105 unsigned long __vmalloc_start;
106 EXPORT_SYMBOL(__vmalloc_start);
107 unsigned long __vmalloc_end;
108 EXPORT_SYMBOL(__vmalloc_end);
109 unsigned long __kernel_io_start;
110 EXPORT_SYMBOL(__kernel_io_start);
111 struct page *vmemmap;
112 EXPORT_SYMBOL(vmemmap);
113 unsigned long __pte_frag_nr;
114 EXPORT_SYMBOL(__pte_frag_nr);
115 unsigned long __pte_frag_size_shift;
116 EXPORT_SYMBOL(__pte_frag_size_shift);
117 unsigned long ioremap_bot;
118 #else /* !CONFIG_PPC_BOOK3S_64 */
119 unsigned long ioremap_bot = IOREMAP_BASE;
123 * __ioremap_at - Low level function to establish the page tables
126 void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
131 /* Make sure we have the base flags */
132 if ((flags & _PAGE_PRESENT) == 0)
133 flags |= pgprot_val(PAGE_KERNEL);
135 /* We don't support the 4K PFN hack with ioremap */
136 if (flags & H_PAGE_4K_PFN)
139 WARN_ON(pa & ~PAGE_MASK);
140 WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
141 WARN_ON(size & ~PAGE_MASK);
143 for (i = 0; i < size; i += PAGE_SIZE)
144 if (map_kernel_page((unsigned long)ea+i, pa+i, flags))
147 return (void __iomem *)ea;
151 * __iounmap_from - Low level function to tear down the page tables
152 * for an IO mapping. This is used for mappings that
153 * are manipulated manually, like partial unmapping of
154 * PCI IOs or ISA space.
156 void __iounmap_at(void *ea, unsigned long size)
158 WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
159 WARN_ON(size & ~PAGE_MASK);
161 unmap_kernel_range((unsigned long)ea, size);
164 void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
165 unsigned long flags, void *caller)
167 phys_addr_t paligned;
171 * Choose an address to map it to.
172 * Once the imalloc system is running, we use it.
173 * Before that, we map using addresses going
174 * up from ioremap_bot. imalloc will use
175 * the addresses from ioremap_bot through
179 paligned = addr & PAGE_MASK;
180 size = PAGE_ALIGN(addr + size) - paligned;
182 if ((size == 0) || (paligned == 0))
185 if (slab_is_available()) {
186 struct vm_struct *area;
188 area = __get_vm_area_caller(size, VM_IOREMAP,
189 ioremap_bot, IOREMAP_END,
194 area->phys_addr = paligned;
195 ret = __ioremap_at(paligned, area->addr, size, flags);
199 ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags);
205 ret += addr & ~PAGE_MASK;
209 void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
212 return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
215 void __iomem * ioremap(phys_addr_t addr, unsigned long size)
217 unsigned long flags = pgprot_val(pgprot_noncached(__pgprot(0)));
218 void *caller = __builtin_return_address(0);
221 return ppc_md.ioremap(addr, size, flags, caller);
222 return __ioremap_caller(addr, size, flags, caller);
225 void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
227 unsigned long flags = pgprot_val(pgprot_noncached_wc(__pgprot(0)));
228 void *caller = __builtin_return_address(0);
231 return ppc_md.ioremap(addr, size, flags, caller);
232 return __ioremap_caller(addr, size, flags, caller);
235 void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
238 void *caller = __builtin_return_address(0);
240 /* writeable implies dirty for kernel addresses */
241 if (flags & _PAGE_WRITE)
242 flags |= _PAGE_DIRTY;
244 /* we don't want to let _PAGE_EXEC leak out */
245 flags &= ~_PAGE_EXEC;
247 * Force kernel mapping.
249 flags &= ~_PAGE_USER;
250 flags |= _PAGE_PRIVILEGED;
253 return ppc_md.ioremap(addr, size, flags, caller);
254 return __ioremap_caller(addr, size, flags, caller);
259 * Unmap an IO region and remove it from imalloc'd list.
260 * Access to IO memory should be serialized by driver.
262 void __iounmap(volatile void __iomem *token)
266 if (!slab_is_available())
269 addr = (void *) ((unsigned long __force)
270 PCI_FIX_ADDR(token) & PAGE_MASK);
271 if ((unsigned long)addr < ioremap_bot) {
272 printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
279 void iounmap(volatile void __iomem *token)
282 ppc_md.iounmap(token);
287 EXPORT_SYMBOL(ioremap);
288 EXPORT_SYMBOL(ioremap_wc);
289 EXPORT_SYMBOL(ioremap_prot);
290 EXPORT_SYMBOL(__ioremap);
291 EXPORT_SYMBOL(__ioremap_at);
292 EXPORT_SYMBOL(iounmap);
293 EXPORT_SYMBOL(__iounmap);
294 EXPORT_SYMBOL(__iounmap_at);
296 #ifndef __PAGETABLE_PUD_FOLDED
297 /* 4 level page table */
298 struct page *pgd_page(pgd_t pgd)
301 return pte_page(pgd_pte(pgd));
302 return virt_to_page(pgd_page_vaddr(pgd));
306 struct page *pud_page(pud_t pud)
309 return pte_page(pud_pte(pud));
310 return virt_to_page(pud_page_vaddr(pud));
314 * For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
315 * For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
317 struct page *pmd_page(pmd_t pmd)
319 if (pmd_trans_huge(pmd) || pmd_huge(pmd) || pmd_devmap(pmd))
320 return pte_page(pmd_pte(pmd));
321 return virt_to_page(pmd_page_vaddr(pmd));
324 #ifdef CONFIG_PPC_64K_PAGES
325 static pte_t *get_from_cache(struct mm_struct *mm)
327 void *pte_frag, *ret;
329 spin_lock(&mm->page_table_lock);
330 ret = mm->context.pte_frag;
332 pte_frag = ret + PTE_FRAG_SIZE;
334 * If we have taken up all the fragments mark PTE page NULL
336 if (((unsigned long)pte_frag & ~PAGE_MASK) == 0)
338 mm->context.pte_frag = pte_frag;
340 spin_unlock(&mm->page_table_lock);
344 static pte_t *__alloc_for_cache(struct mm_struct *mm, int kernel)
350 page = alloc_page(PGALLOC_GFP | __GFP_ACCOUNT);
353 if (!pgtable_page_ctor(page)) {
358 page = alloc_page(PGALLOC_GFP);
363 ret = page_address(page);
364 spin_lock(&mm->page_table_lock);
366 * If we find pgtable_page set, we return
367 * the allocated page with single fragement
370 if (likely(!mm->context.pte_frag)) {
371 set_page_count(page, PTE_FRAG_NR);
372 mm->context.pte_frag = ret + PTE_FRAG_SIZE;
374 spin_unlock(&mm->page_table_lock);
379 pte_t *pte_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr, int kernel)
383 pte = get_from_cache(mm);
387 return __alloc_for_cache(mm, kernel);
389 #endif /* CONFIG_PPC_64K_PAGES */
391 void pte_fragment_free(unsigned long *table, int kernel)
393 struct page *page = virt_to_page(table);
394 if (put_page_testzero(page)) {
396 pgtable_page_dtor(page);
397 free_unref_page(page);
402 void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
404 unsigned long pgf = (unsigned long)table;
406 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
408 tlb_remove_table(tlb, (void *)pgf);
411 void __tlb_remove_table(void *_table)
413 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
414 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
417 /* PTE page needs special handling */
418 pte_fragment_free(table, 0);
420 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
421 kmem_cache_free(PGT_CACHE(shift), table);
425 void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
428 /* PTE page needs special handling */
429 pte_fragment_free(table, 0);
431 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
432 kmem_cache_free(PGT_CACHE(shift), table);
437 #ifdef CONFIG_PPC_BOOK3S_64
438 void __init mmu_partition_table_init(void)
440 unsigned long patb_size = 1UL << PATB_SIZE_SHIFT;
443 BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 36), "Partition table size too large.");
444 partition_tb = __va(memblock_alloc_base(patb_size, patb_size,
445 MEMBLOCK_ALLOC_ANYWHERE));
447 /* Initialize the Partition Table with no entries */
448 memset((void *)partition_tb, 0, patb_size);
451 * update partition table control register,
454 ptcr = __pa(partition_tb) | (PATB_SIZE_SHIFT - 12);
455 mtspr(SPRN_PTCR, ptcr);
456 powernv_set_nmmu_ptcr(ptcr);
459 void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
462 unsigned long old = be64_to_cpu(partition_tb[lpid].patb0);
464 partition_tb[lpid].patb0 = cpu_to_be64(dw0);
465 partition_tb[lpid].patb1 = cpu_to_be64(dw1);
468 * Global flush of TLBs and partition table caches for this lpid.
469 * The type of flush (hash or radix) depends on what the previous
470 * use of this partition ID was, not the new use.
472 asm volatile("ptesync" : : : "memory");
474 asm volatile(PPC_TLBIE_5(%0,%1,2,0,1) : :
475 "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
476 asm volatile(PPC_TLBIE_5(%0,%1,2,1,1) : :
477 "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
478 trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 1);
480 asm volatile(PPC_TLBIE_5(%0,%1,2,0,0) : :
481 "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
482 trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 0);
484 asm volatile("eieio; tlbsync; ptesync" : : : "memory");
486 EXPORT_SYMBOL_GPL(mmu_partition_table_set_entry);
487 #endif /* CONFIG_PPC_BOOK3S_64 */
489 #ifdef CONFIG_STRICT_KERNEL_RWX
490 void mark_rodata_ro(void)
492 if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) {
493 pr_warn("Warning: Unable to mark rodata read only on this CPU.\n");
498 radix__mark_rodata_ro();
500 hash__mark_rodata_ro();
503 void mark_initmem_nx(void)
506 radix__mark_initmem_nx();
508 hash__mark_initmem_nx();