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Atmosphere/libraries/libmesosphere/source/kern_debug_log_impl.board.nintendo_nx.cpp

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/*
* Copyright (c) Atmosphère-NX
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*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
#include "kern_debug_log_impl.hpp"
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namespace ams::kern {
#if defined(MESOSPHERE_DEBUG_LOG_USE_UART)
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namespace {
constexpr bool DoSaveAndRestore = false;
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enum UartRegister {
UartRegister_THR = 0,
UartRegister_IER = 1,
UartRegister_FCR = 2,
UartRegister_LCR = 3,
UartRegister_LSR = 5,
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UartRegister_IRDA_CSR = 8,
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UartRegister_DLL = 0,
UartRegister_DLH = 1,
};
KVirtualAddress g_uart_address = 0;
[[maybe_unused]] constinit u32 g_saved_registers[5];
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ALWAYS_INLINE u32 ReadUartRegister(UartRegister which) {
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return GetPointer<volatile u32>(g_uart_address)[which];
}
ALWAYS_INLINE void WriteUartRegister(UartRegister which, u32 value) {
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GetPointer<volatile u32>(g_uart_address)[which] = value;
}
}
bool KDebugLogImpl::Initialize() {
/* Get the uart memory region. */
const KMemoryRegion *uart_region = KMemoryLayout::GetPhysicalMemoryRegionTree().FindFirstDerived(KMemoryRegionType_Uart);
if (uart_region == nullptr) {
return false;
}
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/* Set the uart register base address. */
g_uart_address = uart_region->GetPairAddress();
if (g_uart_address == Null<KVirtualAddress>) {
return false;
}
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/* NOTE: We assume here that UART init/config has been done by the Secure Monitor. */
/* As such, we only need to disable interrupts. */
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WriteUartRegister(UartRegister_IER, 0x00);
return true;
}
void KDebugLogImpl::PutChar(char c) {
while (ReadUartRegister(UartRegister_LSR) & 0x100) {
/* While the FIFO is full, yield. */
cpu::Yield();
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}
WriteUartRegister(UartRegister_THR, c);
cpu::DataSynchronizationBarrier();
}
void KDebugLogImpl::Flush() {
while ((ReadUartRegister(UartRegister_LSR) & 0x40) == 0) {
/* Wait for the TMTY bit to be one (transmit empty). */
}
}
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void KDebugLogImpl::Save() {
if constexpr (DoSaveAndRestore) {
/* Save LCR, IER, FCR. */
g_saved_registers[0] = ReadUartRegister(UartRegister_LCR);
g_saved_registers[1] = ReadUartRegister(UartRegister_IER);
g_saved_registers[2] = ReadUartRegister(UartRegister_FCR);
/* Set Divisor Latch Access bit, to allow access to DLL/DLH */
WriteUartRegister(UartRegister_LCR, 0x80);
ReadUartRegister(UartRegister_LCR);
/* Save DLL/DLH. */
g_saved_registers[3] = ReadUartRegister(UartRegister_DLL);
g_saved_registers[4] = ReadUartRegister(UartRegister_DLH);
/* Restore Divisor Latch Access bit. */
WriteUartRegister(UartRegister_LCR, g_saved_registers[0]);
ReadUartRegister(UartRegister_LCR);
}
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}
void KDebugLogImpl::Restore() {
if constexpr (DoSaveAndRestore) {
/* Set Divisor Latch Access bit, to allow access to DLL/DLH */
WriteUartRegister(UartRegister_LCR, 0x80);
ReadUartRegister(UartRegister_LCR);
/* Restore DLL/DLH. */
WriteUartRegister(UartRegister_DLL, g_saved_registers[3]);
WriteUartRegister(UartRegister_DLH, g_saved_registers[4]);
ReadUartRegister(UartRegister_DLH);
/* Restore Divisor Latch Access bit. */
WriteUartRegister(UartRegister_LCR, g_saved_registers[0]);
ReadUartRegister(UartRegister_LCR);
/* Restore IER and FCR. */
WriteUartRegister(UartRegister_IER, g_saved_registers[1]);
WriteUartRegister(UartRegister_FCR, g_saved_registers[2] | 2);
WriteUartRegister(UartRegister_IRDA_CSR, 0x02);
ReadUartRegister(UartRegister_FCR);
}
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}
#elif defined(MESOSPHERE_DEBUG_LOG_USE_IRAM_RINGBUFFER)
namespace {
constinit KVirtualAddress g_debug_iram_address = 0;
constexpr size_t RingBufferSize = 0x5000;
constinit uintptr_t g_offset = 0;
constinit u8 g_saved_buffer[RingBufferSize];
}
bool KDebugLogImpl::Initialize() {
/* Set the base address. */
g_debug_iram_address = KMemoryLayout::GetDeviceVirtualAddress(KMemoryRegionType_LegacyLpsIram) + 0x38000;
std::memset(GetVoidPointer(g_debug_iram_address), 0xFF, RingBufferSize);
return true;
}
void KDebugLogImpl::PutChar(char c) {
GetPointer<char>(g_debug_iram_address)[g_offset++] = c;
if (g_offset == RingBufferSize) {
g_offset = 0;
}
}
void KDebugLogImpl::Flush() {
/* ... */
}
void KDebugLogImpl::Save() {
std::memcpy(g_saved_buffer, GetVoidPointer(g_debug_iram_address), RingBufferSize);
}
void KDebugLogImpl::Restore() {
std::memcpy(GetVoidPointer(g_debug_iram_address), g_saved_buffer, RingBufferSize);
}
#else
#error "Unknown Debug UART device!"
#endif
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}