1 files changed, 71 insertions, 5 deletions

diff --git a/src/core/hle/service/gsp.cpp b/src/core/hle/service/gsp.cpp
index 88c1f1a0f..58df970c4 100644
--- a/src/core/hle/service/gsp.cpp
+++ b/src/core/hle/service/gsp.cpp
@@ -4,6 +4,7 @@
 
 
 #include "common/log.h"
+#include "common/bit_field.h"
 
 #include "core/mem_map.h"
 #include "core/hle/hle.h"
@@ -12,10 +13,56 @@
 #include "core/hw/lcd.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
+
+/// GSP shared memory GX command buffer header
+union GX_CmdBufferHeader {
+    u32 hex;
+
+    // Current command index. This index is updated by GSP module after loading the command data, 
+    // right before the command is processed. When this index is updated by GSP module, the total 
+    // commands field is decreased by one as well.
+    BitField<0,8,u32>   index;
+    
+    // Total commands to process, must not be value 0 when GSP module handles commands. This must be
+    // <=15 when writing a command to shared memory. This is incremented by the application when 
+    // writing a command to shared memory, after increasing this value TriggerCmdReqQueue is only 
+    // used if this field is value 1.
+    BitField<8,8,u32>  number_commands;
+    
+    // Must not be value 1. When the error-code u32 is set, this u8 is set to value 0x80.
+    BitField<16,8,u32> unk_0;
+
+    // Bit 0 must not be set
+    BitField<24,8,u32> unk_1;
+};
+
+/// Gets the address of the start (header) of a command buffer in GSP shared memory
+static inline u32 GX_GetCmdBufferAddress(u32 thread_id) {
+    return (0x10002000 + 0x800 + (thread_id * 0x200));
+}
+
+/// Gets a pointer to the start (header) of a command buffer in GSP shared memory
+static inline u8* GX_GetCmdBufferPointer(u32 thread_id, u32 offset=0) {
+    return Memory::GetPointer(GX_GetCmdBufferAddress(thread_id) + offset);
+}
+
+/// Finishes execution of a GSP command
+void GX_FinishCommand(u32 thread_id) {
+    GX_CmdBufferHeader* header = (GX_CmdBufferHeader*)GX_GetCmdBufferPointer(thread_id);
+    header->number_commands = header->number_commands - 1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
 // Namespace GSP_GPU
 
 namespace GSP_GPU {
 
+u32 g_thread_id = 0;
+
+enum {
+    CMD_GX_REQUEST_DMA  = 0x00000000,
+};
+
 enum {
     REG_FRAMEBUFFER_1   = 0x00400468,
     REG_FRAMEBUFFER_2   = 0x00400494,
@@ -26,7 +73,7 @@ void ReadHWRegs(Service::Interface* self) {
     static const u32 framebuffer_1[] = {LCD::PADDR_VRAM_TOP_LEFT_FRAME1, LCD::PADDR_VRAM_TOP_RIGHT_FRAME1};
     static const u32 framebuffer_2[] = {LCD::PADDR_VRAM_TOP_LEFT_FRAME2, LCD::PADDR_VRAM_TOP_RIGHT_FRAME2};
 
-    u32* cmd_buff = (u32*)HLE::GetPointer(HLE::CMD_BUFFER_ADDR + Service::kCommandHeaderOffset);
+    u32* cmd_buff = Service::GetCommandBuffer();
     u32 reg_addr = cmd_buff[1];
     u32 size = cmd_buff[2];
     u32* dst = (u32*)Memory::GetPointer(cmd_buff[0x41]);
@@ -50,18 +97,37 @@ void ReadHWRegs(Service::Interface* self) {
         break;
 
     default:
-        ERROR_LOG(OSHLE, "GSP_GPU::ReadHWRegs unknown register read at address %08X", reg_addr);
+        ERROR_LOG(GSP, "ReadHWRegs unknown register read at address %08X", reg_addr);
     }
 
 }
 
 void RegisterInterruptRelayQueue(Service::Interface* self) {
-    u32* cmd_buff = (u32*)HLE::GetPointer(HLE::CMD_BUFFER_ADDR + Service::kCommandHeaderOffset);
+    u32* cmd_buff = Service::GetCommandBuffer();
     u32 flags = cmd_buff[1];
     u32 event_handle = cmd_buff[3]; // TODO(bunnei): Implement event handling
+    
+    cmd_buff[2] = g_thread_id;          // ThreadID
     cmd_buff[4] = self->NewHandle();
+}
+
+/// This triggers handling of the GX command written to the command buffer in shared memory.
+void TriggerCmdReqQueue(Service::Interface* self) {
+    GX_CmdBufferHeader* header = (GX_CmdBufferHeader*)GX_GetCmdBufferPointer(g_thread_id);
+    u32* cmd_buff = (u32*)GX_GetCmdBufferPointer(g_thread_id, 0x20 + (header->index * 0x20));
 
-    return;
+    switch (cmd_buff[0]) {
+
+    // GX request DMA - typically used for copying memory from GSP heap to VRAM
+    case CMD_GX_REQUEST_DMA:
+        memcpy(Memory::GetPointer(cmd_buff[2]), Memory::GetPointer(cmd_buff[1]), cmd_buff[3]);
+        break;
+
+    default:
+        ERROR_LOG(GSP, "TriggerCmdReqQueue unknown command 0x%08X", cmd_buff[0]);
+    }
+    
+    GX_FinishCommand(g_thread_id);
 }
 
 const Interface::FunctionInfo FunctionTable[] = {
@@ -76,7 +142,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x00090082, NULL,                          "InvalidateDataCache"},
     {0x000A0044, NULL,                          "RegisterInterruptEvents"},
     {0x000B0040, NULL,                          "SetLcdForceBlack"},
-    {0x000C0000, NULL,                          "TriggerCmdReqQueue"},
+    {0x000C0000, TriggerCmdReqQueue,            "TriggerCmdReqQueue"},
     {0x000D0140, NULL,                          "SetDisplayTransfer"},
     {0x000E0180, NULL,                          "SetTextureCopy"},
     {0x000F0200, NULL,                          "SetMemoryFill"},