72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include "common/scummsys.h"
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#if defined(DYNAMIC_MODULES) && defined(RISCOS)
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#include "backends/plugins/riscos/riscos-provider.h"
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#include "backends/plugins/elf/arm-loader.h"
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#include "common/debug.h"
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#include <kernel.h>
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#include <swis.h>
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typedef void (*Cache_CleanInvalidateRangePtr)(void *start, void *end);
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// This function enters in supervisor mode, call the ARMop and leaves the supervisor mode
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static void call_Cache_CleanInvalidateRange(void *start, void *end, Cache_CleanInvalidateRangePtr f) __asm__(".call_Cache_CleanInvalidateRange");
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__asm__(
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".call_Cache_CleanInvalidateRange:\n"
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"PUSH {r4, lr}\n" // Backup r4 and lr
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"MRS r4, cpsr\n" // Backup CPSR in R4
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"SWI 0x16\n" // OS_EnterOS
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"MOV lr, pc\n" //
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"MOV pc, r2\n" // Call 3rd argument (function pointer)
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"MSR cpsr_c, r4\n" // Restore CPSR (leave SVC mode)
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"POP {r4, pc}\n" // Restore R4 and return
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);
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class RiscOSDLObject : public ARMDLObject {
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protected:
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void flushDataCache(void *ptr, uint32 len) const override {
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Cache_CleanInvalidateRangePtr Cache_CleanInvalidateRange;
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if (!_swix(OS_MMUControl, _IN(0)|_OUT(0), 2 | 21 << 8, &Cache_CleanInvalidateRange)) {
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call_Cache_CleanInvalidateRange(ptr, (char *)ptr + len, Cache_CleanInvalidateRange);
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return;
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}
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// OS_MMUControl 2 or Cache_CleanInvalidateRange are not supported: fallback to old inefficient OS_MMUControl 1
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_swix(OS_MMUControl, _IN(0), 1 | 1 << 28 | 1 << 30 | 1 << 31);
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}
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};
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Plugin *RiscOSPluginProvider::createPlugin(const Common::FSNode &node) const {
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return new TemplatedELFPlugin<RiscOSDLObject>(node.getPath());
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}
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#endif // defined(DYNAMIC_MODULES) && defined(RISCOS)
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