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

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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21
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;
asm("mrs %[cntfrq_el0], cntfrq_el0" : [cntfrq_el0] "=r"(cntfrq_el0));
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;
}