2 * $Id: xltcache.c,v 1.1 2007-08-23 12:33:27 nkeynes Exp $
4 * Translation cache management. This part is architecture independent.
6 * Copyright (c) 2005 Nathan Keynes.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include "sh4/xltcache.h"
20 #include "dreamcast.h"
24 #define XLAT_LUT_PAGE_BITS 12
25 #define XLAT_LUT_TOTAL_BITS 28
26 #define XLAT_LUT_PAGE(addr) (((addr)>>13) & 0xFFFF)
27 #define XLAT_LUT_ENTRY(addr) (((addr)&0x1FFE) >> 1)
29 #define XLAT_LUT_PAGES (1<<(XLAT_LUT_TOTAL_BITS-XLAT_LUT_PAGE_BITS))
30 #define XLAT_LUT_PAGE_ENTRIES (1<<XLAT_LUT_PAGE_BITS)
31 #define XLAT_LUT_PAGE_SIZE (XLAT_LUT_PAGE_ENTRIES * sizeof(void *))
33 #define XLAT_LUT_ENTRY_EMPTY (void *)0
34 #define XLAT_LUT_ENTRY_USED (void *)1
36 #define NEXT(block) ( (xlat_cache_block_t)&((block)->code[(block)->size]))
37 #define BLOCK_FOR_CODE(code) (((xlat_cache_block_t)code)-1)
38 #define IS_ENTRY_POINT(ent) (ent > XLAT_LUT_ENTRY_USED)
39 #define IS_ENTRY_USED(ent) (ent != XLAT_LUT_ENTRY_EMPTY)
41 #define MIN_BLOCK_SIZE 32
42 #define MIN_TOTAL_SIZE (sizeof(struct xlat_cache_block)+MIN_BLOCK_SIZE)
44 #define BLOCK_INACTIVE 0
45 #define BLOCK_ACTIVE 1
48 xlat_cache_block_t xlat_new_cache;
49 xlat_cache_block_t xlat_new_cache_ptr;
50 xlat_cache_block_t xlat_new_create_ptr;
51 xlat_cache_block_t xlat_temp_cache;
52 xlat_cache_block_t xlat_temp_cache_ptr;
53 xlat_cache_block_t xlat_old_cache;
54 xlat_cache_block_t xlat_old_cache_ptr;
55 static void ***xlat_lut;
56 static void **xlat_lut2; /* second-tier page info */
58 void xlat_cache_init()
60 xlat_new_cache = mmap( NULL, XLAT_NEW_CACHE_SIZE, PROT_EXEC|PROT_READ|PROT_WRITE,
61 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 );
62 xlat_temp_cache = mmap( NULL, XLAT_TEMP_CACHE_SIZE, PROT_EXEC|PROT_READ|PROT_WRITE,
63 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 );
64 xlat_old_cache = mmap( NULL, XLAT_OLD_CACHE_SIZE, PROT_EXEC|PROT_READ|PROT_WRITE,
65 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 );
66 xlat_new_cache_ptr = xlat_new_cache;
67 xlat_temp_cache_ptr = xlat_temp_cache;
68 xlat_old_cache_ptr = xlat_old_cache;
69 xlat_new_create_ptr = xlat_new_cache;
71 xlat_lut = mmap( NULL, XLAT_LUT_PAGES*sizeof(void *), PROT_READ|PROT_WRITE,
72 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
73 memset( xlat_lut, 0, XLAT_LUT_PAGES*sizeof(void *) );
79 * Reset the cache structure to its default state
81 void xlat_flush_cache()
83 xlat_cache_block_t tmp;
85 xlat_new_cache_ptr = xlat_new_cache;
86 xlat_new_cache_ptr->active = 0;
87 xlat_new_cache_ptr->size = XLAT_NEW_CACHE_SIZE - 2*sizeof(struct xlat_cache_block);
88 tmp = NEXT(xlat_new_cache_ptr);
91 xlat_temp_cache_ptr = xlat_temp_cache;
92 xlat_temp_cache_ptr->active = 0;
93 xlat_temp_cache_ptr->size = XLAT_TEMP_CACHE_SIZE - 2*sizeof(struct xlat_cache_block);
94 tmp = NEXT(xlat_temp_cache_ptr);
97 xlat_old_cache_ptr = xlat_old_cache;
98 xlat_old_cache_ptr->active = 0;
99 xlat_old_cache_ptr->size = XLAT_OLD_CACHE_SIZE - 2*sizeof(struct xlat_cache_block);
100 tmp = NEXT(xlat_old_cache_ptr);
103 for( i=0; i<XLAT_LUT_PAGES; i++ ) {
104 if( xlat_lut[i] != NULL ) {
105 memset( xlat_lut[i], 0, XLAT_LUT_PAGE_SIZE );
110 void xlat_flush_page( sh4addr_t address )
113 void **page = xlat_lut[XLAT_LUT_PAGE(address)];
114 for( i=0; i<XLAT_LUT_PAGE_ENTRIES; i++ ) {
115 if( IS_ENTRY_POINT(page[i]) ) {
116 BLOCK_FOR_CODE(page[i])->active = 0;
122 void *xlat_get_code( sh4addr_t address )
124 void **page = xlat_lut[XLAT_LUT_PAGE(address)];
128 return page[XLAT_LUT_ENTRY(address)];
132 * Cut the specified block so that it has the given size, with the remaining data
133 * forming a new free block. If the free block would be less than the minimum size,
134 * the cut is not performed.
135 * @return the next block after the (possibly cut) block.
137 static inline xlat_cache_block_t xlat_cut_block( xlat_cache_block_t block, int cutsize )
139 if( block->size > cutsize + MIN_TOTAL_SIZE ) {
140 int oldsize = block->size;
141 block->size = cutsize;
142 xlat_cache_block_t next = NEXT(block);
144 next->size = oldsize - cutsize - sizeof(struct xlat_cache_block);
152 * Promote a block in temp space (or elsewhere for that matter) to old space.
154 * @param block to promote.
156 static void xlat_promote_to_old_space( xlat_cache_block_t block )
158 int allocation = -sizeof(struct xlat_cache_block);
159 int size = block->size;
160 xlat_cache_block_t curr = xlat_old_cache_ptr;
161 xlat_cache_block_t start_block = curr;
163 allocation += curr->size + sizeof(struct xlat_cache_block);
165 if( allocation > size ) {
168 if( curr->size == 0 ) { /* End-of-cache Sentinel */
169 /* Leave what we just released as free space and start again from the
172 start_block->active = 0;
173 start_block->size = allocation;
174 allocation = -sizeof(struct xlat_cache_block);
175 start_block = curr = xlat_old_cache;
178 start_block->active = 1;
179 start_block->size = allocation;
180 start_block->lut_entry = block->lut_entry;
181 *block->lut_entry = &start_block->code;
182 memcpy( start_block->code, block->code, block->size );
183 xlat_old_cache_ptr = xlat_cut_block(start_block, size );
184 if( xlat_old_cache_ptr->size == 0 ) {
185 xlat_old_cache_ptr = xlat_old_cache;
190 * Similarly to the above method, promotes a block to temp space.
191 * TODO: Try to combine these - they're nearly identical
193 void xlat_promote_to_temp_space( xlat_cache_block_t block )
195 int size = block->size;
196 int allocation = -sizeof(struct xlat_cache_block);
197 xlat_cache_block_t curr = xlat_temp_cache_ptr;
198 xlat_cache_block_t start_block = curr;
200 if( curr->active == BLOCK_USED ) {
201 xlat_promote_to_old_space( curr );
203 allocation += curr->size + sizeof(struct xlat_cache_block);
205 if( allocation > size ) {
208 if( curr->size == 0 ) { /* End-of-cache Sentinel */
209 /* Leave what we just released as free space and start again from the
212 start_block->active = 0;
213 start_block->size = allocation;
214 allocation = -sizeof(struct xlat_cache_block);
215 start_block = curr = xlat_temp_cache;
218 start_block->active = 1;
219 start_block->size = allocation;
220 start_block->lut_entry = block->lut_entry;
221 *block->lut_entry = &start_block->code;
222 memcpy( start_block->code, block->code, block->size );
223 xlat_temp_cache_ptr = xlat_cut_block(start_block, size );
224 if( xlat_temp_cache_ptr->size == 0 ) {
225 xlat_temp_cache_ptr = xlat_temp_cache;
231 * Returns the next block in the new cache list that can be written to by the
232 * translator. If the next block is active, it is evicted first.
234 xlat_cache_block_t xlat_start_block( sh4addr_t address )
236 if( xlat_new_cache_ptr->size == 0 ) {
237 xlat_new_cache_ptr = xlat_new_cache;
240 if( xlat_new_cache_ptr->active ) {
241 xlat_promote_to_temp_space( xlat_new_cache_ptr );
243 xlat_new_create_ptr = xlat_new_cache_ptr;
244 xlat_new_create_ptr->active = 1;
245 xlat_new_cache_ptr = NEXT(xlat_new_cache_ptr);
247 /* Add the LUT entry for the block */
248 if( xlat_lut[XLAT_LUT_PAGE(address)] == NULL ) {
249 xlat_lut[XLAT_LUT_PAGE(address)] =
250 mmap( NULL, XLAT_LUT_PAGE_SIZE, PROT_READ|PROT_WRITE,
251 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 );
252 memset( xlat_lut[XLAT_LUT_PAGE(address)], 0, XLAT_LUT_PAGE_SIZE );
255 if( IS_ENTRY_POINT(xlat_lut[XLAT_LUT_PAGE(address)][XLAT_LUT_ENTRY(address)]) ) {
256 xlat_cache_block_t oldblock = BLOCK_FOR_CODE(xlat_lut[XLAT_LUT_PAGE(address)][XLAT_LUT_ENTRY(address)]);
257 oldblock->active = 0;
260 xlat_lut[XLAT_LUT_PAGE(address)][XLAT_LUT_ENTRY(address)] =
261 &xlat_new_create_ptr->code;
262 xlat_new_create_ptr->lut_entry = xlat_lut[XLAT_LUT_PAGE(address)] + XLAT_LUT_ENTRY(address);
264 return xlat_new_create_ptr;
267 xlat_cache_block_t xlat_extend_block()
269 if( xlat_new_cache_ptr->size == 0 ) {
270 /* Migrate to the front of the cache to keep it contiguous */
271 xlat_new_create_ptr->active = 0;
272 char *olddata = xlat_new_create_ptr->code;
273 int oldsize = xlat_new_create_ptr->size;
274 int size = oldsize + MIN_BLOCK_SIZE; /* minimum expansion */
275 void **lut_entry = xlat_new_create_ptr->lut_entry;
276 int allocation = -sizeof(struct xlat_cache_block);
277 xlat_new_cache_ptr = xlat_new_cache;
279 if( xlat_new_cache_ptr->active ) {
280 xlat_promote_to_temp_space( xlat_new_cache_ptr );
282 allocation += xlat_new_cache_ptr->size + sizeof(struct xlat_cache_block);
283 xlat_new_cache_ptr = NEXT(xlat_new_cache_ptr);
284 } while( allocation < size );
285 xlat_new_create_ptr = xlat_new_cache;
286 xlat_new_create_ptr->active = 1;
287 xlat_new_create_ptr->size = allocation;
288 xlat_new_create_ptr->lut_entry = lut_entry;
289 *lut_entry = &xlat_new_create_ptr->code;
290 memmove( xlat_new_create_ptr->code, olddata, oldsize );
292 if( xlat_new_cache_ptr->active ) {
293 xlat_promote_to_temp_space( xlat_new_cache_ptr );
295 xlat_new_create_ptr->size += xlat_new_cache_ptr->size + sizeof(struct xlat_cache_block);
296 xlat_new_cache_ptr = NEXT(xlat_new_cache_ptr);
298 return xlat_new_create_ptr;
302 void xlat_commit_block( uint32_t destsize, uint32_t srcsize )
304 void **ptr = xlat_new_create_ptr->lut_entry;
305 void **endptr = ptr + (srcsize>>2);
306 while( ptr < endptr ) {
308 *ptr = XLAT_LUT_ENTRY_USED;
313 xlat_new_cache_ptr = xlat_cut_block( xlat_new_create_ptr, destsize );
316 void xlat_delete_block( xlat_cache_block_t block )
319 *block->lut_entry = NULL;
322 void xlat_check_cache_integrity( xlat_cache_block_t cache, xlat_cache_block_t ptr, int size )
325 xlat_cache_block_t tail =
326 (xlat_cache_block_t)(((char *)cache) + size - sizeof(struct xlat_cache_block));
328 assert( tail->active == 1 );
329 assert( tail->size == 0 );
330 while( cache < tail ) {
331 assert( cache->active >= 0 && cache->active <= 2 );
332 assert( cache->size >= 0 && cache->size < size );
338 assert( cache == tail );
339 assert( foundptr == 1 );
342 void xlat_check_integrity( )
344 xlat_check_cache_integrity( xlat_new_cache, xlat_new_cache_ptr, XLAT_NEW_CACHE_SIZE );
345 xlat_check_cache_integrity( xlat_temp_cache, xlat_temp_cache_ptr, XLAT_TEMP_CACHE_SIZE );
346 xlat_check_cache_integrity( xlat_old_cache, xlat_old_cache_ptr, XLAT_OLD_CACHE_SIZE );
.