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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 
 36 #include <asm/pgtable.h>
 37 #include <asm/pgalloc.h>
 38 #include <linux/io.h>
 39 #include <asm/mmu.h>
 40 #include <asm/sections.h>
 41 #include <asm/fixmap.h>
 42 
 43 unsigned long ioremap_base;
 44 unsigned long ioremap_bot;
 45 EXPORT_SYMBOL(ioremap_bot);
 46 
 47 #ifndef CONFIG_SMP
 48 struct pgtable_cache_struct quicklists;
 49 #endif
 50 
 51 static void __iomem *__ioremap(phys_addr_t addr, unsigned long size,
 52                 unsigned long flags)
 53 {
 54         unsigned long v, i;
 55         phys_addr_t p;
 56         int err;
 57 
 58         /*
 59          * Choose an address to map it to.
 60          * Once the vmalloc system is running, we use it.
 61          * Before then, we use space going down from ioremap_base
 62          * (ioremap_bot records where we're up to).
 63          */
 64         p = addr & PAGE_MASK;
 65         size = PAGE_ALIGN(addr + size) - p;
 66 
 67         /*
 68          * Don't allow anybody to remap normal RAM that we're using.
 69          * mem_init() sets high_memory so only do the check after that.
 70          *
 71          * However, allow remap of rootfs: TBD
 72          */
 73 
 74         if (mem_init_done &&
 75                 p >= memory_start && p < virt_to_phys(high_memory) &&
 76                 !(p >= __virt_to_phys((phys_addr_t)__bss_stop) &&
 77                 p < __virt_to_phys((phys_addr_t)__bss_stop))) {
 78                 pr_warn("__ioremap(): phys addr "PTE_FMT" is RAM lr %ps\n",
 79                         (unsigned long)p, __builtin_return_address(0));
 80                 return NULL;
 81         }
 82 
 83         if (size == 0)
 84                 return NULL;
 85 
 86         /*
 87          * Is it already mapped? If the whole area is mapped then we're
 88          * done, otherwise remap it since we want to keep the virt addrs for
 89          * each request contiguous.
 90          *
 91          * We make the assumption here that if the bottom and top
 92          * of the range we want are mapped then it's mapped to the
 93          * same virt address (and this is contiguous).
 94          *  -- Cort
 95          */
 96 
 97         if (mem_init_done) {
 98                 struct vm_struct *area;
 99                 area = get_vm_area(size, VM_IOREMAP);
100                 if (area == NULL)
101                         return NULL;
102                 v = (unsigned long) area->addr;
103         } else {
104                 v = (ioremap_bot -= size);
105         }
106 
107         if ((flags & _PAGE_PRESENT) == 0)
108                 flags |= _PAGE_KERNEL;
109         if (flags & _PAGE_NO_CACHE)
110                 flags |= _PAGE_GUARDED;
111 
112         err = 0;
113         for (i = 0; i < size && err == 0; i += PAGE_SIZE)
114                 err = map_page(v + i, p + i, flags);
115         if (err) {
116                 if (mem_init_done)
117                         vfree((void *)v);
118                 return NULL;
119         }
120 
121         return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
122 }
123 
124 void __iomem *ioremap(phys_addr_t addr, unsigned long size)
125 {
126         return __ioremap(addr, size, _PAGE_NO_CACHE);
127 }
128 EXPORT_SYMBOL(ioremap);
129 
130 void iounmap(volatile void __iomem *addr)
131 {
132         if ((__force void *)addr > high_memory &&
133                                         (unsigned long) addr < ioremap_bot)
134                 vfree((void *) (PAGE_MASK & (unsigned long) addr));
135 }
136 EXPORT_SYMBOL(iounmap);
137 
138 
139 int map_page(unsigned long va, phys_addr_t pa, int flags)
140 {
141         pmd_t *pd;
142         pte_t *pg;
143         int err = -ENOMEM;
144         /* Use upper 10 bits of VA to index the first level map */
145         pd = pmd_offset(pgd_offset_k(va), va);
146         /* Use middle 10 bits of VA to index the second-level map */
147         pg = pte_alloc_kernel(pd, va); /* from powerpc - pgtable.c */
148         /* pg = pte_alloc_kernel(&init_mm, pd, va); */
149 
150         if (pg != NULL) {
151                 err = 0;
152                 set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
153                                 __pgprot(flags)));
154                 if (unlikely(mem_init_done))
155                         _tlbie(va);
156         }
157         return err;
158 }
159 
160 /*
161  * Map in all of physical memory starting at CONFIG_KERNEL_START.
162  */
163 void __init mapin_ram(void)
164 {
165         unsigned long v, p, s, f;
166 
167         v = CONFIG_KERNEL_START;
168         p = memory_start;
169         for (s = 0; s < lowmem_size; s += PAGE_SIZE) {
170                 f = _PAGE_PRESENT | _PAGE_ACCESSED |
171                                 _PAGE_SHARED | _PAGE_HWEXEC;
172                 if ((char *) v < _stext || (char *) v >= _etext)
173                         f |= _PAGE_WRENABLE;
174                 else
175                         /* On the MicroBlaze, no user access
176                            forces R/W kernel access */
177                         f |= _PAGE_USER;
178                 map_page(v, p, f);
179                 v += PAGE_SIZE;
180                 p += PAGE_SIZE;
181         }
182 }
183 
184 /* is x a power of 2? */
185 #define is_power_of_2(x)        ((x) != 0 && (((x) & ((x) - 1)) == 0))
186 
187 /* Scan the real Linux page tables and return a PTE pointer for
188  * a virtual address in a context.
189  * Returns true (1) if PTE was found, zero otherwise.  The pointer to
190  * the PTE pointer is unmodified if PTE is not found.
191  */
192 static int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep)
193 {
194         pgd_t   *pgd;
195         pmd_t   *pmd;
196         pte_t   *pte;
197         int     retval = 0;
198 
199         pgd = pgd_offset(mm, addr & PAGE_MASK);
200         if (pgd) {
201                 pmd = pmd_offset(pgd, addr & PAGE_MASK);
202                 if (pmd_present(*pmd)) {
203                         pte = pte_offset_kernel(pmd, addr & PAGE_MASK);
204                         if (pte) {
205                                 retval = 1;
206                                 *ptep = pte;
207                         }
208                 }
209         }
210         return retval;
211 }
212 
213 /* Find physical address for this virtual address.  Normally used by
214  * I/O functions, but anyone can call it.
215  */
216 unsigned long iopa(unsigned long addr)
217 {
218         unsigned long pa;
219 
220         pte_t *pte;
221         struct mm_struct *mm;
222 
223         /* Allow mapping of user addresses (within the thread)
224          * for DMA if necessary.
225          */
226         if (addr < TASK_SIZE)
227                 mm = current->mm;
228         else
229                 mm = &init_mm;
230 
231         pa = 0;
232         if (get_pteptr(mm, addr, &pte))
233                 pa = (pte_val(*pte) & PAGE_MASK) | (addr & ~PAGE_MASK);
234 
235         return pa;
236 }
237 
238 __ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
239 {
240         pte_t *pte;
241         if (mem_init_done) {
242                 pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
243         } else {
244                 pte = (pte_t *)early_get_page();
245                 if (pte)
246                         clear_page(pte);
247         }
248         return pte;
249 }
250 
251 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
252 {
253         unsigned long address = __fix_to_virt(idx);
254 
255         if (idx >= __end_of_fixed_addresses)
256                 BUG();
257 
258         map_page(address, phys, pgprot_val(flags));
259 }
260 

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