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16#include <linux/export.h>
17#include <linux/signal.h>
18#include <linux/sched.h>
19#include <linux/kernel.h>
20#include <linux/errno.h>
21#include <linux/string.h>
22#include <linux/types.h>
23#include <linux/ptrace.h>
24#include <linux/mman.h>
25#include <linux/mm.h>
26#include <linux/swap.h>
27#include <linux/stddef.h>
28#include <linux/vmalloc.h>
29#include <linux/init.h>
30#include <linux/delay.h>
31#include <linux/bootmem.h>
32#include <linux/highmem.h>
33#include <linux/pci.h>
34#include <linux/interrupt.h>
35#include <linux/gfp.h>
36
37#include <asm/pgalloc.h>
38#include <linux/io.h>
39#include <linux/hardirq.h>
40#include <linux/mmu_context.h>
41#include <asm/mmu.h>
42#include <linux/uaccess.h>
43#include <asm/pgtable.h>
44#include <asm/cpuinfo.h>
45#include <asm/tlbflush.h>
46
47#ifndef CONFIG_MMU
48
49# define UNCACHED_SHADOW_MASK (cpuinfo.dcache_high - cpuinfo.dcache_base + 1)
50#endif
51
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60
61
62void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *dma_handle)
63{
64 unsigned long order, vaddr;
65 void *ret;
66 unsigned int i, err = 0;
67 struct page *page, *end;
68
69#ifdef CONFIG_MMU
70 phys_addr_t pa;
71 struct vm_struct *area;
72 unsigned long va;
73#endif
74
75 if (in_interrupt())
76 BUG();
77
78
79 size = PAGE_ALIGN(size);
80 order = get_order(size);
81
82 vaddr = __get_free_pages(gfp, order);
83 if (!vaddr)
84 return NULL;
85
86
87
88
89
90 flush_dcache_range(virt_to_phys((void *)vaddr),
91 virt_to_phys((void *)vaddr) + size);
92
93#ifndef CONFIG_MMU
94 ret = (void *)vaddr;
95
96
97
98
99
100# ifdef CONFIG_XILINX_UNCACHED_SHADOW
101 ret = (void *)((unsigned) ret | UNCACHED_SHADOW_MASK);
102# endif
103 if ((unsigned int)ret > cpuinfo.dcache_base &&
104 (unsigned int)ret < cpuinfo.dcache_high)
105 pr_warn("ERROR: Your cache coherent area is CACHED!!!\n");
106
107
108 *dma_handle = (dma_addr_t)ret;
109#else
110
111 area = get_vm_area(size, VM_ALLOC);
112 if (!area) {
113 free_pages(vaddr, order);
114 return NULL;
115 }
116 va = (unsigned long) area->addr;
117 ret = (void *)va;
118
119
120 *dma_handle = pa = __virt_to_phys(vaddr);
121#endif
122
123
124
125
126
127
128
129 page = virt_to_page(vaddr);
130 end = page + (1 << order);
131
132 split_page(page, order);
133
134 for (i = 0; i < size && err == 0; i += PAGE_SIZE) {
135#ifdef CONFIG_MMU
136
137 err = map_page(va + i, pa + i, _PAGE_KERNEL | _PAGE_NO_CACHE);
138#endif
139
140 SetPageReserved(page);
141 page++;
142 }
143
144
145 while (page < end) {
146 __free_page(page);
147 page++;
148 }
149
150 if (err) {
151 free_pages(vaddr, order);
152 return NULL;
153 }
154
155 return ret;
156}
157EXPORT_SYMBOL(consistent_alloc);
158
159
160
161
162void consistent_free(size_t size, void *vaddr)
163{
164 struct page *page;
165
166 if (in_interrupt())
167 BUG();
168
169 size = PAGE_ALIGN(size);
170
171#ifndef CONFIG_MMU
172
173# ifdef CONFIG_XILINX_UNCACHED_SHADOW
174 vaddr = (void *)((unsigned)vaddr & ~UNCACHED_SHADOW_MASK);
175# endif
176 page = virt_to_page(vaddr);
177
178 do {
179 __free_reserved_page(page);
180 page++;
181 } while (size -= PAGE_SIZE);
182#else
183 do {
184 pte_t *ptep;
185 unsigned long pfn;
186
187 ptep = pte_offset_kernel(pmd_offset(pgd_offset_k(
188 (unsigned int)vaddr),
189 (unsigned int)vaddr),
190 (unsigned int)vaddr);
191 if (!pte_none(*ptep) && pte_present(*ptep)) {
192 pfn = pte_pfn(*ptep);
193 pte_clear(&init_mm, (unsigned int)vaddr, ptep);
194 if (pfn_valid(pfn)) {
195 page = pfn_to_page(pfn);
196 __free_reserved_page(page);
197 }
198 }
199 vaddr += PAGE_SIZE;
200 } while (size -= PAGE_SIZE);
201
202
203 flush_tlb_all();
204#endif
205}
206EXPORT_SYMBOL(consistent_free);
207
208
209
210
211void consistent_sync(void *vaddr, size_t size, int direction)
212{
213 unsigned long start;
214 unsigned long end;
215
216 start = (unsigned long)vaddr;
217
218
219#ifdef CONFIG_XILINX_UNCACHED_SHADOW
220 start &= ~UNCACHED_SHADOW_MASK;
221#endif
222 end = start + size;
223
224 switch (direction) {
225 case PCI_DMA_NONE:
226 BUG();
227 case PCI_DMA_FROMDEVICE:
228 invalidate_dcache_range(start, end);
229 break;
230 case PCI_DMA_TODEVICE:
231 flush_dcache_range(start, end);
232 break;
233 case PCI_DMA_BIDIRECTIONAL:
234 flush_dcache_range(start, end);
235 break;
236 }
237}
238EXPORT_SYMBOL(consistent_sync);
239
240
241
242
243
244
245void consistent_sync_page(struct page *page, unsigned long offset,
246 size_t size, int direction)
247{
248 unsigned long start = (unsigned long)page_address(page) + offset;
249 consistent_sync((void *)start, size, direction);
250}
251EXPORT_SYMBOL(consistent_sync_page);
252