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arm: NativeClock: Special handling for bad system counter clock frequency reporting

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On some devices, checking the system counter clock frequency will return 0. Substitute in the correct values to prevent issues.
This commit is contained in:
Charles Lombardo 2023-11-03 16:21:54 -04:00
parent d6e6ab11b1
commit 4b321c003c
1 changed files with 20 additions and 1 deletions
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19
src/common/arm64/native_clock.cpp
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@ -1,6 +1,9 @@
// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#ifdef ANDROID
#include <sys/system_properties.h>
#endif
#include "common/arm64/native_clock.h"
namespace Common::Arm64 {
@ -65,7 +68,23 @@ bool NativeClock::IsNative() const {
u64 NativeClock::GetHostCNTFRQ() {
u64 cntfrq_el0 = 0;
std::string_view board{""};
#ifdef ANDROID
char buffer[PROP_VALUE_MAX];
int len{__system_property_get("ro.product.board", buffer)};
board = std::string_view(buffer, static_cast<size_t>(len));
#endif
if (board == "s5e9925") { // Exynos 2200
cntfrq_el0 = 25600000;
} else if (board == "exynos2100") { // Exynos 2100
cntfrq_el0 = 26000000;
} else if (board == "exynos9810") { // Exynos 9810
cntfrq_el0 = 26000000;
} else if (board == "s5e8825") { // Exynos 1280
cntfrq_el0 = 26000000;
} else {
asm("mrs %[cntfrq_el0], cntfrq_el0" : [cntfrq_el0] "=r"(cntfrq_el0));
}
return cntfrq_el0;
}