88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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/* flushcache.c
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* Copyright 1984-2017 Cisco Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "system.h"
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#ifdef FLUSHCACHE
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typedef struct {
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uptr start;
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uptr end;
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} mod_range;
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#define mod_range_start(x) (((mod_range *)&BVIT(x,0))->start)
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#define mod_range_end(x) (((mod_range *)&BVIT(x,0))->end)
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static uptr max_gap;
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static ptr make_mod_range(uptr start, uptr end) {
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ptr bv = S_bytevector(sizeof(mod_range));
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mod_range_start(bv) = start;
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mod_range_end(bv) = end;
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return bv;
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}
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/* we record info per thread so flush in one prematurely for another doesn't prevent
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the other from doing its own flush...and also since it's not clear that flushing in one
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actually syncs caches across cores & processors */
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void S_record_code_mod(ptr tc, uptr addr, uptr bytes) {
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uptr end = addr + bytes;
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ptr ls = CODERANGESTOFLUSH(tc);
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if (ls != Snil) {
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ptr last_mod = Scar(ls);
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uptr last_end = mod_range_end(last_mod);
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if (addr > last_end && addr - last_end < max_gap) {
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#ifdef DEBUG
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printf(" record_code_mod merging %x %x and %x %x\n", mod_range_start(last_mod), last_end, addr, end); fflush(stdout);
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#endif
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mod_range_end(last_mod) = end;
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return;
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}
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}
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#ifdef DEBUG
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printf(" record_code_mod new range %x to %x\n", addr, end); fflush(stdout);
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#endif
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CODERANGESTOFLUSH(tc) = S_cons_in(space_new, 0, make_mod_range(addr, end), ls);
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return;
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}
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extern void S_flush_instruction_cache(ptr tc) {
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ptr ls;
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for (ls = CODERANGESTOFLUSH(tc); ls != Snil; ls = Scdr(ls)) {
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S_doflush(mod_range_start(Scar(ls)), mod_range_end(Scar(ls)));
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}
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CODERANGESTOFLUSH(tc) = Snil;
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}
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extern void S_flushcache_init(void) {
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if (S_boot_time) {
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max_gap = S_flushcache_max_gap();
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if (max_gap < (uptr)(code_data_disp + byte_alignment)) {
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max_gap = (uptr)(code_data_disp + byte_alignment);
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}
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}
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}
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#else /* FLUSHCACHE */
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extern void S_record_code_mod(UNUSED ptr tc, UNUSED uptr addr, UNUSED uptr bytes) {}
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extern void S_flush_instruction_cache(UNUSED ptr tc) {}
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extern void S_flushcache_init(void) { return; }
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#endif /* FLUSHCACHE */
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