tlb.c revision dc36abf34e13aabbe06cdd060c434b3cdd80e7da 
1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/mm.h"
7#include "asm/page.h"
8#include "asm/pgalloc.h"
9#include "asm/tlbflush.h"
10#include "choose-mode.h"
11#include "mode_kern.h"
12#include "user_util.h"
13#include "tlb.h"
14#include "mem.h"
15#include "mem_user.h"
16#include "os.h"
17
18static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
19 		    int r, int w, int x, struct host_vm_op *ops, int *index,
20		    int last_filled, union mm_context *mmu, void **flush,
21		    int (*do_ops)(union mm_context *, struct host_vm_op *,
22				  int, int, void **))
23{
24        __u64 offset;
25	struct host_vm_op *last;
26	int fd, ret = 0;
27
28	fd = phys_mapping(phys, &offset);
29	if(*index != -1){
30		last = &ops[*index];
31		if((last->type == MMAP) &&
32		   (last->u.mmap.addr + last->u.mmap.len == virt) &&
33		   (last->u.mmap.r == r) && (last->u.mmap.w == w) &&
34		   (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
35		   (last->u.mmap.offset + last->u.mmap.len == offset)){
36			last->u.mmap.len += len;
37			return 0;
38		}
39	}
40
41	if(*index == last_filled){
42		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
43		*index = -1;
44	}
45
46	ops[++*index] = ((struct host_vm_op) { .type	= MMAP,
47			     			.u = { .mmap = {
48						       .addr	= virt,
49						       .len	= len,
50						       .r	= r,
51						       .w	= w,
52						       .x	= x,
53						       .fd	= fd,
54						       .offset	= offset }
55			   } });
56	return ret;
57}
58
59static int add_munmap(unsigned long addr, unsigned long len,
60		      struct host_vm_op *ops, int *index, int last_filled,
61		      union mm_context *mmu, void **flush,
62		      int (*do_ops)(union mm_context *, struct host_vm_op *,
63				    int, int, void **))
64{
65	struct host_vm_op *last;
66	int ret = 0;
67
68	if(*index != -1){
69		last = &ops[*index];
70		if((last->type == MUNMAP) &&
71		   (last->u.munmap.addr + last->u.mmap.len == addr)){
72			last->u.munmap.len += len;
73			return 0;
74		}
75	}
76
77	if(*index == last_filled){
78		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
79		*index = -1;
80	}
81
82	ops[++*index] = ((struct host_vm_op) { .type	= MUNMAP,
83			     		       .u = { .munmap = {
84						        .addr	= addr,
85							.len	= len } } });
86	return ret;
87}
88
89static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
90			int x, struct host_vm_op *ops, int *index,
91			int last_filled, union mm_context *mmu, void **flush,
92 			int (*do_ops)(union mm_context *, struct host_vm_op *,
93				      int, int, void **))
94{
95	struct host_vm_op *last;
96	int ret = 0;
97
98	if(*index != -1){
99		last = &ops[*index];
100		if((last->type == MPROTECT) &&
101		   (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
102		   (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
103		   (last->u.mprotect.x == x)){
104			last->u.mprotect.len += len;
105			return 0;
106		}
107	}
108
109	if(*index == last_filled){
110		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
111		*index = -1;
112	}
113
114	ops[++*index] = ((struct host_vm_op) { .type	= MPROTECT,
115			     		       .u = { .mprotect = {
116						       .addr	= addr,
117						       .len	= len,
118						       .r	= r,
119						       .w	= w,
120						       .x	= x } } });
121	return ret;
122}
123
124#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
125
126void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
127                      unsigned long end_addr, int force,
128		      int (*do_ops)(union mm_context *, struct host_vm_op *,
129				    int, int, void **))
130{
131        pgd_t *npgd;
132        pud_t *npud;
133        pmd_t *npmd;
134        pte_t *npte;
135        union mm_context *mmu = &mm->context;
136        unsigned long addr, end;
137        int r, w, x;
138        struct host_vm_op ops[1];
139        void *flush = NULL;
140        int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;
141        int ret = 0;
142
143        if(mm == NULL) return;
144
145        ops[0].type = NONE;
146        for(addr = start_addr; addr < end_addr && !ret;){
147                npgd = pgd_offset(mm, addr);
148                if(!pgd_present(*npgd)){
149                        end = ADD_ROUND(addr, PGDIR_SIZE);
150                        if(end > end_addr)
151                                end = end_addr;
152                        if(force || pgd_newpage(*npgd)){
153                                ret = add_munmap(addr, end - addr, ops,
154                                                 &op_index, last_op, mmu,
155                                                 &flush, do_ops);
156                                pgd_mkuptodate(*npgd);
157                        }
158                        addr = end;
159                        continue;
160                }
161
162                npud = pud_offset(npgd, addr);
163                if(!pud_present(*npud)){
164                        end = ADD_ROUND(addr, PUD_SIZE);
165                        if(end > end_addr)
166                                end = end_addr;
167                        if(force || pud_newpage(*npud)){
168                                ret = add_munmap(addr, end - addr, ops,
169                                                 &op_index, last_op, mmu,
170                                                 &flush, do_ops);
171                                pud_mkuptodate(*npud);
172                        }
173                        addr = end;
174                        continue;
175                }
176
177                npmd = pmd_offset(npud, addr);
178                if(!pmd_present(*npmd)){
179                        end = ADD_ROUND(addr, PMD_SIZE);
180                        if(end > end_addr)
181                                end = end_addr;
182                        if(force || pmd_newpage(*npmd)){
183                                ret = add_munmap(addr, end - addr, ops,
184                                                 &op_index, last_op, mmu,
185                                                 &flush, do_ops);
186                                pmd_mkuptodate(*npmd);
187                        }
188                        addr = end;
189                        continue;
190                }
191
192                npte = pte_offset_kernel(npmd, addr);
193                r = pte_read(*npte);
194                w = pte_write(*npte);
195                x = pte_exec(*npte);
196		if (!pte_young(*npte)) {
197			r = 0;
198			w = 0;
199		} else if (!pte_dirty(*npte)) {
200			w = 0;
201		}
202                if(force || pte_newpage(*npte)){
203                        if(pte_present(*npte))
204			  ret = add_mmap(addr,
205					 pte_val(*npte) & PAGE_MASK,
206					 PAGE_SIZE, r, w, x, ops,
207					 &op_index, last_op, mmu,
208					 &flush, do_ops);
209			else ret = add_munmap(addr, PAGE_SIZE, ops,
210					      &op_index, last_op, mmu,
211					      &flush, do_ops);
212                }
213                else if(pte_newprot(*npte))
214			ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
215					   &op_index, last_op, mmu,
216					   &flush, do_ops);
217
218                *npte = pte_mkuptodate(*npte);
219                addr += PAGE_SIZE;
220        }
221
222	if(!ret)
223		ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
224
225	/* This is not an else because ret is modified above */
226	if(ret) {
227		printk("fix_range_common: failed, killing current process\n");
228		force_sig(SIGKILL, current);
229	}
230}
231
232int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
233{
234        struct mm_struct *mm;
235        pgd_t *pgd;
236        pud_t *pud;
237        pmd_t *pmd;
238        pte_t *pte;
239        unsigned long addr, last;
240        int updated = 0, err;
241
242        mm = &init_mm;
243        for(addr = start; addr < end;){
244                pgd = pgd_offset(mm, addr);
245                if(!pgd_present(*pgd)){
246                        last = ADD_ROUND(addr, PGDIR_SIZE);
247                        if(last > end)
248                                last = end;
249                        if(pgd_newpage(*pgd)){
250                                updated = 1;
251                                err = os_unmap_memory((void *) addr,
252                                                      last - addr);
253                                if(err < 0)
254                                        panic("munmap failed, errno = %d\n",
255                                              -err);
256                        }
257                        addr = last;
258                        continue;
259                }
260
261                pud = pud_offset(pgd, addr);
262                if(!pud_present(*pud)){
263                        last = ADD_ROUND(addr, PUD_SIZE);
264                        if(last > end)
265                                last = end;
266                        if(pud_newpage(*pud)){
267                                updated = 1;
268                                err = os_unmap_memory((void *) addr,
269                                                      last - addr);
270                                if(err < 0)
271                                        panic("munmap failed, errno = %d\n",
272                                              -err);
273                        }
274                        addr = last;
275                        continue;
276                }
277
278                pmd = pmd_offset(pud, addr);
279                if(!pmd_present(*pmd)){
280                        last = ADD_ROUND(addr, PMD_SIZE);
281                        if(last > end)
282                                last = end;
283                        if(pmd_newpage(*pmd)){
284                                updated = 1;
285                                err = os_unmap_memory((void *) addr,
286                                                      last - addr);
287                                if(err < 0)
288                                        panic("munmap failed, errno = %d\n",
289                                              -err);
290                        }
291                        addr = last;
292                        continue;
293                }
294
295                pte = pte_offset_kernel(pmd, addr);
296                if(!pte_present(*pte) || pte_newpage(*pte)){
297                        updated = 1;
298                        err = os_unmap_memory((void *) addr,
299                                              PAGE_SIZE);
300                        if(err < 0)
301                                panic("munmap failed, errno = %d\n",
302                                      -err);
303                        if(pte_present(*pte))
304                                map_memory(addr,
305                                           pte_val(*pte) & PAGE_MASK,
306                                           PAGE_SIZE, 1, 1, 1);
307                }
308                else if(pte_newprot(*pte)){
309                        updated = 1;
310                        os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
311                }
312                addr += PAGE_SIZE;
313        }
314        return(updated);
315}
316
317pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
318{
319        return(pgd_offset(mm, address));
320}
321
322pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
323{
324        return(pud_offset(pgd, address));
325}
326
327pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
328{
329        return(pmd_offset(pud, address));
330}
331
332pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
333{
334        return(pte_offset_kernel(pmd, address));
335}
336
337pte_t *addr_pte(struct task_struct *task, unsigned long addr)
338{
339        pgd_t *pgd = pgd_offset(task->mm, addr);
340        pud_t *pud = pud_offset(pgd, addr);
341        pmd_t *pmd = pmd_offset(pud, addr);
342
343        return(pte_offset_map(pmd, addr));
344}
345
346void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
347{
348        address &= PAGE_MASK;
349        flush_tlb_range(vma, address, address + PAGE_SIZE);
350}
351
352void flush_tlb_all(void)
353{
354        flush_tlb_mm(current->mm);
355}
356
357void flush_tlb_kernel_range(unsigned long start, unsigned long end)
358{
359        CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt,
360                         flush_tlb_kernel_range_common, start, end);
361}
362
363void flush_tlb_kernel_vm(void)
364{
365        CHOOSE_MODE(flush_tlb_kernel_vm_tt(),
366                    flush_tlb_kernel_range_common(start_vm, end_vm));
367}
368
369void __flush_tlb_one(unsigned long addr)
370{
371        CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr);
372}
373
374void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
375		     unsigned long end)
376{
377        CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start,
378                         end);
379}
380
381void flush_tlb_mm(struct mm_struct *mm)
382{
383        CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm);
384}
385
386void force_flush_all(void)
387{
388        CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas());
389}
390
391