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exo/meso/fusee: support dynamic control of log port/baud rate

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This commit is contained in:
Michael Scire 2020-12-07 19:25:06 -08:00
parent 121c981bb4
commit 2de85c633a
17 changed files with 183 additions and 99 deletions
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70
libraries/libmesosphere/source/kern_debug_log_impl.board.nintendo_nx.cpp
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@ -18,10 +18,12 @@
namespace ams::kern {
#if defined(MESOSPHERE_DEBUG_LOG_USE_UART_A) || defined(MESOSPHERE_DEBUG_LOG_USE_UART_B) || defined(MESOSPHERE_DEBUG_LOG_USE_UART_C) || defined(MESOSPHERE_DEBUG_LOG_USE_UART_D)
#if defined(MESOSPHERE_DEBUG_LOG_USE_UART)
namespace {
constexpr bool DoSaveAndRestore = false;
enum UartRegister {
UartRegister_THR = 0,
UartRegister_IER = 1,
@ -38,13 +40,13 @@ namespace ams::kern {
KVirtualAddress g_uart_address = 0;
constinit u32 g_saved_registers[5];
[[maybe_unused]] constinit u32 g_saved_registers[5];
NOINLINE u32 ReadUartRegister(UartRegister which) {
ALWAYS_INLINE u32 ReadUartRegister(UartRegister which) {
return GetPointer<volatile u32>(g_uart_address)[which];
}
NOINLINE void WriteUartRegister(UartRegister which, u32 value) {
ALWAYS_INLINE void WriteUartRegister(UartRegister which, u32 value) {
GetPointer<volatile u32>(g_uart_address)[which] = value;
}
@ -86,43 +88,47 @@ namespace ams::kern {
}
void KDebugLogImpl::Save() {
/* 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);
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);
/* 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);
/* 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);
/* Restore Divisor Latch Access bit. */
WriteUartRegister(UartRegister_LCR, g_saved_registers[0]);
ReadUartRegister(UartRegister_LCR);
}
}
void KDebugLogImpl::Restore() {
/* Set Divisor Latch Access bit, to allow access to DLL/DLH */
WriteUartRegister(UartRegister_LCR, 0x80);
ReadUartRegister(UartRegister_LCR);
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 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 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);
/* 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);
}
}
#elif defined(MESOSPHERE_DEBUG_LOG_USE_IRAM_RINGBUFFER)