1 /*
 2  * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
 3  * Copyright (c) 2020, 2022, Huawei Technologies Co., Ltd. All rights reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  *
24  */
25 
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.hpp"
28 #include "runtime/icache.hpp"
29 
30 #define __ _masm->
31 
32 static int icache_flush(address addr, int lines, int magic) {
33   // To make a store to instruction memory visible to all RISC-V harts,
34   // the writing hart has to execute a data FENCE before requesting that
35   // all remote RISC-V harts execute a FENCE.I.
36   //
37   // No sush assurance is defined at the interface level of the builtin
38   // method, and so we should make sure it works.
39   __asm__ volatile("fence rw, rw" : : : "memory");
40 
41   __builtin___clear_cache(addr, addr + (lines << ICache::log2_line_size));
42   return magic;
43 }
44 
45 void ICacheStubGenerator::generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub) {
46   address start = (address)icache_flush;
47   *flush_icache_stub = (ICache::flush_icache_stub_t)start;
48 
49   // ICache::invalidate_range() contains explicit condition that the first
50   // call is invoked on the generated icache flush stub code range.
51   ICache::invalidate_range(start, 0);
52 
53   {
54     StubCodeMark mark(this, "ICache", "fake_stub_for_inlined_icache_flush");
55     __ ret();
56   }
57 }
58 
59 #undef __