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/slab.h>
37 #include <linux/hugetlb.h>
39 #include <asm/pgalloc.h>
43 #include <asm/mmu_context.h>
44 #include <asm/pgtable.h>
47 #include <asm/machdep.h>
49 #include <asm/processor.h>
50 #include <asm/cputable.h>
51 #include <asm/sections.h>
52 #include <asm/firmware.h>
55 #include <mm/mmu_decl.h>
58 #ifdef CONFIG_PPC_BOOK3S_64
60 * partition table and process table for ISA 3.0
62 struct prtb_entry *process_tb;
63 struct patb_entry *partition_tb;
67 unsigned long __pte_index_size;
68 EXPORT_SYMBOL(__pte_index_size);
69 unsigned long __pmd_index_size;
70 EXPORT_SYMBOL(__pmd_index_size);
71 unsigned long __pud_index_size;
72 EXPORT_SYMBOL(__pud_index_size);
73 unsigned long __pgd_index_size;
74 EXPORT_SYMBOL(__pgd_index_size);
75 unsigned long __pud_cache_index;
76 EXPORT_SYMBOL(__pud_cache_index);
77 unsigned long __pte_table_size;
78 EXPORT_SYMBOL(__pte_table_size);
79 unsigned long __pmd_table_size;
80 EXPORT_SYMBOL(__pmd_table_size);
81 unsigned long __pud_table_size;
82 EXPORT_SYMBOL(__pud_table_size);
83 unsigned long __pgd_table_size;
84 EXPORT_SYMBOL(__pgd_table_size);
85 unsigned long __pmd_val_bits;
86 EXPORT_SYMBOL(__pmd_val_bits);
87 unsigned long __pud_val_bits;
88 EXPORT_SYMBOL(__pud_val_bits);
89 unsigned long __pgd_val_bits;
90 EXPORT_SYMBOL(__pgd_val_bits);
91 unsigned long __kernel_virt_start;
92 EXPORT_SYMBOL(__kernel_virt_start);
93 unsigned long __vmalloc_start;
94 EXPORT_SYMBOL(__vmalloc_start);
95 unsigned long __vmalloc_end;
96 EXPORT_SYMBOL(__vmalloc_end);
97 unsigned long __kernel_io_start;
98 EXPORT_SYMBOL(__kernel_io_start);
99 unsigned long __kernel_io_end;
100 struct page *vmemmap;
101 EXPORT_SYMBOL(vmemmap);
102 unsigned long __pte_frag_nr;
103 EXPORT_SYMBOL(__pte_frag_nr);
104 unsigned long __pte_frag_size_shift;
105 EXPORT_SYMBOL(__pte_frag_size_shift);
106 unsigned long ioremap_bot;
107 #else /* !CONFIG_PPC_BOOK3S_64 */
108 unsigned long ioremap_bot = IOREMAP_BASE;
111 int __weak ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot, int nid)
115 for (i = 0; i < size; i += PAGE_SIZE) {
116 int err = map_kernel_page(ea + i, pa + i, prot);
118 if (slab_is_available())
119 unmap_kernel_range(ea, size);
121 WARN_ON_ONCE(1); /* Should clean up */
130 * __ioremap_at - Low level function to establish the page tables
133 void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot)
135 /* We don't support the 4K PFN hack with ioremap */
136 if (pgprot_val(prot) & H_PAGE_4K_PFN)
139 if ((ea + size) >= (void *)IOREMAP_END) {
140 pr_warn("Outside the supported range\n");
144 WARN_ON(pa & ~PAGE_MASK);
145 WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
146 WARN_ON(size & ~PAGE_MASK);
148 if (ioremap_range((unsigned long)ea, pa, size, prot, NUMA_NO_NODE))
151 return (void __iomem *)ea;
155 * __iounmap_from - Low level function to tear down the page tables
156 * for an IO mapping. This is used for mappings that
157 * are manipulated manually, like partial unmapping of
158 * PCI IOs or ISA space.
160 void __iounmap_at(void *ea, unsigned long size)
162 WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
163 WARN_ON(size & ~PAGE_MASK);
165 unmap_kernel_range((unsigned long)ea, size);
168 void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
169 pgprot_t prot, void *caller)
171 phys_addr_t paligned;
175 * Choose an address to map it to.
176 * Once the imalloc system is running, we use it.
177 * Before that, we map using addresses going
178 * up from ioremap_bot. imalloc will use
179 * the addresses from ioremap_bot through
183 paligned = addr & PAGE_MASK;
184 size = PAGE_ALIGN(addr + size) - paligned;
186 if ((size == 0) || (paligned == 0))
189 if (slab_is_available()) {
190 struct vm_struct *area;
192 area = __get_vm_area_caller(size, VM_IOREMAP,
193 ioremap_bot, IOREMAP_END,
198 area->phys_addr = paligned;
199 ret = __ioremap_at(paligned, area->addr, size, prot);
201 ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot);
207 ret += addr & ~PAGE_MASK;
211 void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
214 return __ioremap_caller(addr, size, __pgprot(flags), __builtin_return_address(0));
217 void __iomem * ioremap(phys_addr_t addr, unsigned long size)
219 pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
220 void *caller = __builtin_return_address(0);
223 return ppc_md.ioremap(addr, size, prot, caller);
224 return __ioremap_caller(addr, size, prot, caller);
227 void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
229 pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
230 void *caller = __builtin_return_address(0);
233 return ppc_md.ioremap(addr, size, prot, caller);
234 return __ioremap_caller(addr, size, prot, caller);
237 void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
239 pgprot_t prot = pgprot_cached(PAGE_KERNEL);
240 void *caller = __builtin_return_address(0);
243 return ppc_md.ioremap(addr, size, prot, caller);
244 return __ioremap_caller(addr, size, prot, caller);
247 void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
250 pte_t pte = __pte(flags);
251 void *caller = __builtin_return_address(0);
253 /* writeable implies dirty for kernel addresses */
255 pte = pte_mkdirty(pte);
257 /* we don't want to let _PAGE_EXEC leak out */
258 pte = pte_exprotect(pte);
260 * Force kernel mapping.
262 pte = pte_mkprivileged(pte);
265 return ppc_md.ioremap(addr, size, pte_pgprot(pte), caller);
266 return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
271 * Unmap an IO region and remove it from imalloc'd list.
272 * Access to IO memory should be serialized by driver.
274 void __iounmap(volatile void __iomem *token)
278 if (!slab_is_available())
281 addr = (void *) ((unsigned long __force)
282 PCI_FIX_ADDR(token) & PAGE_MASK);
283 if ((unsigned long)addr < ioremap_bot) {
284 printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
291 void iounmap(volatile void __iomem *token)
294 ppc_md.iounmap(token);
299 EXPORT_SYMBOL(ioremap);
300 EXPORT_SYMBOL(ioremap_wc);
301 EXPORT_SYMBOL(ioremap_prot);
302 EXPORT_SYMBOL(__ioremap);
303 EXPORT_SYMBOL(__ioremap_at);
304 EXPORT_SYMBOL(iounmap);
305 EXPORT_SYMBOL(__iounmap);
306 EXPORT_SYMBOL(__iounmap_at);
308 #ifndef __PAGETABLE_PUD_FOLDED
309 /* 4 level page table */
310 struct page *pgd_page(pgd_t pgd)
312 if (pgd_is_leaf(pgd)) {
313 VM_WARN_ON(!pgd_huge(pgd));
314 return pte_page(pgd_pte(pgd));
316 return virt_to_page(pgd_page_vaddr(pgd));
320 struct page *pud_page(pud_t pud)
322 if (pud_is_leaf(pud)) {
323 VM_WARN_ON(!pud_huge(pud));
324 return pte_page(pud_pte(pud));
326 return virt_to_page(pud_page_vaddr(pud));
330 * For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
331 * For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
333 struct page *pmd_page(pmd_t pmd)
335 if (pmd_is_leaf(pmd)) {
336 VM_WARN_ON(!(pmd_large(pmd) || pmd_huge(pmd) || pmd_devmap(pmd)));
337 return pte_page(pmd_pte(pmd));
339 return virt_to_page(pmd_page_vaddr(pmd));
342 #ifdef CONFIG_STRICT_KERNEL_RWX
343 void mark_rodata_ro(void)
345 if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) {
346 pr_warn("Warning: Unable to mark rodata read only on this CPU.\n");
351 radix__mark_rodata_ro();
353 hash__mark_rodata_ro();
355 // mark_initmem_nx() should have already run by now
359 void mark_initmem_nx(void)
362 radix__mark_initmem_nx();
364 hash__mark_initmem_nx();