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Linux/arch/microblaze/mm/pgtable.c

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  1 /*
  2  *  This file contains the routines setting up the linux page tables.
  3  *
  4  * Copyright (C) 2008 Michal Simek
  5  * Copyright (C) 2008 PetaLogix
  6  *
  7  *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
  8  *
  9  *  Derived from arch/ppc/mm/pgtable.c:
 10  *    -- paulus
 11  *
 12  *  Derived from arch/ppc/mm/init.c:
 13  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 14  *
 15  *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
 16  *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
 17  *    Copyright (C) 1996 Paul Mackerras
 18  *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
 19  *
 20  *  Derived from "arch/i386/mm/init.c"
 21  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 22  *
 23  *  This file is subject to the terms and conditions of the GNU General
 24  *  Public License.  See the file COPYING in the main directory of this
 25  *  archive for more details.
 26  *
 27  */
 28 
 29 #include <linux/export.h>
 30 #include <linux/kernel.h>
 31 #include <linux/types.h>
 32 #include <linux/vmalloc.h>
 33 #include <linux/init.h>
 34 #include <linux/mm_types.h>
 35 #include <linux/pgtable.h>
 36 #include <linux/memblock.h>
 37 #include <linux/kallsyms.h>
 38 
 39 #include <asm/pgalloc.h>
 40 #include <linux/io.h>
 41 #include <asm/mmu.h>
 42 #include <asm/sections.h>
 43 #include <asm/fixmap.h>
 44 
 45 unsigned long ioremap_base;
 46 unsigned long ioremap_bot;
 47 EXPORT_SYMBOL(ioremap_bot);
 48 
 49 static void __iomem *__ioremap(phys_addr_t addr, unsigned long size,
 50                 unsigned long flags)
 51 {
 52         unsigned long v, i;
 53         phys_addr_t p;
 54         int err;
 55 
 56         /*
 57          * Choose an address to map it to.
 58          * Once the vmalloc system is running, we use it.
 59          * Before then, we use space going down from ioremap_base
 60          * (ioremap_bot records where we're up to).
 61          */
 62         p = addr & PAGE_MASK;
 63         size = PAGE_ALIGN(addr + size) - p;
 64 
 65         /*
 66          * Don't allow anybody to remap normal RAM that we're using.
 67          * mem_init() sets high_memory so only do the check after that.
 68          *
 69          * However, allow remap of rootfs: TBD
 70          */
 71 
 72         if (mem_init_done &&
 73                 p >= memory_start && p < virt_to_phys(high_memory) &&
 74                 !(p >= __virt_to_phys((phys_addr_t)__bss_stop) &&
 75                 p < __virt_to_phys((phys_addr_t)__bss_stop))) {
 76                 pr_warn("__ioremap(): phys addr "PTE_FMT" is RAM lr %ps\n",
 77                         (unsigned long)p, __builtin_return_address(0));
 78                 return NULL;
 79         }
 80 
 81         if (size == 0)
 82                 return NULL;
 83 
 84         /*
 85          * Is it already mapped? If the whole area is mapped then we're
 86          * done, otherwise remap it since we want to keep the virt addrs for
 87          * each request contiguous.
 88          *
 89          * We make the assumption here that if the bottom and top
 90          * of the range we want are mapped then it's mapped to the
 91          * same virt address (and this is contiguous).
 92          *  -- Cort
 93          */
 94 
 95         if (mem_init_done) {
 96                 struct vm_struct *area;
 97                 area = get_vm_area(size, VM_IOREMAP);
 98                 if (area == NULL)
 99                         return NULL;
100                 v = (unsigned long) area->addr;
101         } else {
102                 v = (ioremap_bot -= size);
103         }
104 
105         if ((flags & _PAGE_PRESENT) == 0)
106                 flags |= _PAGE_KERNEL;
107         if (flags & _PAGE_NO_CACHE)
108                 flags |= _PAGE_GUARDED;
109 
110         err = 0;
111         for (i = 0; i < size && err == 0; i += PAGE_SIZE)
112                 err = map_page(v + i, p + i, flags);
113         if (err) {
114                 if (mem_init_done)
115                         vfree((void *)v);
116                 return NULL;
117         }
118 
119         return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
120 }
121 
122 void __iomem *ioremap(phys_addr_t addr, unsigned long size)
123 {
124         return __ioremap(addr, size, _PAGE_NO_CACHE);
125 }
126 EXPORT_SYMBOL(ioremap);
127 
128 void iounmap(volatile void __iomem *addr)
129 {
130         if ((__force void *)addr > high_memory &&
131                                         (unsigned long) addr < ioremap_bot)
132                 vfree((void *) (PAGE_MASK & (unsigned long) addr));
133 }
134 EXPORT_SYMBOL(iounmap);
135 
136 
137 int map_page(unsigned long va, phys_addr_t pa, int flags)
138 {
139         p4d_t *p4d;
140         pud_t *pud;
141         pmd_t *pd;
142         pte_t *pg;
143         int err = -ENOMEM;
144 
145         /* Use upper 10 bits of VA to index the first level map */
146         p4d = p4d_offset(pgd_offset_k(va), va);
147         pud = pud_offset(p4d, va);
148         pd = pmd_offset(pud, va);
149         /* Use middle 10 bits of VA to index the second-level map */
150         pg = pte_alloc_kernel(pd, va); /* from powerpc - pgtable.c */
151         /* pg = pte_alloc_kernel(&init_mm, pd, va); */
152 
153         if (pg != NULL) {
154                 err = 0;
155                 set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
156                                 __pgprot(flags)));
157                 if (unlikely(mem_init_done))
158                         _tlbie(va);
159         }
160         return err;
161 }
162 
163 /*
164  * Map in all of physical memory starting at CONFIG_KERNEL_START.
165  */
166 void __init mapin_ram(void)
167 {
168         unsigned long v, p, s, f;
169 
170         v = CONFIG_KERNEL_START;
171         p = memory_start;
172         for (s = 0; s < lowmem_size; s += PAGE_SIZE) {
173                 f = _PAGE_PRESENT | _PAGE_ACCESSED |
174                                 _PAGE_SHARED | _PAGE_HWEXEC;
175                 if (!is_kernel_text(v))
176                         f |= _PAGE_WRENABLE;
177                 else
178                         /* On the MicroBlaze, no user access
179                            forces R/W kernel access */
180                         f |= _PAGE_USER;
181                 map_page(v, p, f);
182                 v += PAGE_SIZE;
183                 p += PAGE_SIZE;
184         }
185 }
186 
187 /* is x a power of 2? */
188 #define is_power_of_2(x)        ((x) != 0 && (((x) & ((x) - 1)) == 0))
189 
190 /* Scan the real Linux page tables and return a PTE pointer for
191  * a virtual address in a context.
192  * Returns true (1) if PTE was found, zero otherwise.  The pointer to
193  * the PTE pointer is unmodified if PTE is not found.
194  */
195 static int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep)
196 {
197         pgd_t   *pgd;
198         p4d_t   *p4d;
199         pud_t   *pud;
200         pmd_t   *pmd;
201         pte_t   *pte;
202         int     retval = 0;
203 
204         pgd = pgd_offset(mm, addr & PAGE_MASK);
205         if (pgd) {
206                 p4d = p4d_offset(pgd, addr & PAGE_MASK);
207                 pud = pud_offset(p4d, addr & PAGE_MASK);
208                 pmd = pmd_offset(pud, addr & PAGE_MASK);
209                 if (pmd_present(*pmd)) {
210                         pte = pte_offset_kernel(pmd, addr & PAGE_MASK);
211                         if (pte) {
212                                 retval = 1;
213                                 *ptep = pte;
214                         }
215                 }
216         }
217         return retval;
218 }
219 
220 /* Find physical address for this virtual address.  Normally used by
221  * I/O functions, but anyone can call it.
222  */
223 unsigned long iopa(unsigned long addr)
224 {
225         unsigned long pa;
226 
227         pte_t *pte;
228         struct mm_struct *mm;
229 
230         /* Allow mapping of user addresses (within the thread)
231          * for DMA if necessary.
232          */
233         if (addr < TASK_SIZE)
234                 mm = current->mm;
235         else
236                 mm = &init_mm;
237 
238         pa = 0;
239         if (get_pteptr(mm, addr, &pte))
240                 pa = (pte_val(*pte) & PAGE_MASK) | (addr & ~PAGE_MASK);
241 
242         return pa;
243 }
244 
245 __ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
246 {
247         if (mem_init_done)
248                 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
249         else
250                 return memblock_alloc_try_nid(PAGE_SIZE, PAGE_SIZE,
251                                               MEMBLOCK_LOW_LIMIT,
252                                               memory_start + kernel_tlb,
253                                               NUMA_NO_NODE);
254 }
255 
256 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
257 {
258         unsigned long address = __fix_to_virt(idx);
259 
260         if (idx >= __end_of_fixed_addresses)
261                 BUG();
262 
263         map_page(address, phys, pgprot_val(flags));
264 }
265 

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