From e4bd0bddeaaec31a13484bc791e181052211d9ad Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Mon, 23 Apr 2018 11:06:07 -0500
Subject: [PATCH] Nvdrv/nvhost-as-gpu: Implemented the ioctl REMAP command.

It takes a previously-reserved (AllocateSpace) GPU memory address and maps it to the address of the nvmap object passed to Remap.
---
 .../service/nvdrv/devices/nvhost_as_gpu.cpp   | 35 +++++++++++++++++++
 .../hle/service/nvdrv/devices/nvhost_as_gpu.h | 12 +++++++
 2 files changed, 47 insertions(+)

diff --git a/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.cpp b/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.cpp
index 71e8449598..8c56fa1506 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.cpp
+++ b/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.cpp
@@ -27,6 +27,11 @@ u32 nvhost_as_gpu::ioctl(Ioctl command, const std::vector<u8>& input, std::vecto
     case IoctlCommand::IocGetVaRegionsCommand:
         return GetVARegions(input, output);
     }
+
+    if (static_cast<IoctlCommand>(command.cmd.Value()) == IoctlCommand::IocRemapCommand)
+        return Remap(input, output);
+
+    UNIMPLEMENTED_MSG("Unimplemented ioctl command");
     return 0;
 }
 
@@ -56,6 +61,36 @@ u32 nvhost_as_gpu::AllocateSpace(const std::vector<u8>& input, std::vector<u8>&
     return 0;
 }
 
+u32 nvhost_as_gpu::Remap(const std::vector<u8>& input, std::vector<u8>& output) {
+    size_t num_entries = input.size() / sizeof(IoctlRemapEntry);
+
+    NGLOG_WARNING(Service_NVDRV, "(STUBBED) called, num_entries=0x{:X}", num_entries);
+
+    std::vector<IoctlRemapEntry> entries(num_entries);
+    std::memcpy(entries.data(), input.data(), input.size());
+
+    auto& gpu = Core::System::GetInstance().GPU();
+
+    for (const auto& entry : entries) {
+        NGLOG_WARNING(Service_NVDRV, "remap entry, offset=0x{:X} handle=0x{:X} pages=0x{:X}",
+                      entry.offset, entry.nvmap_handle, entry.pages);
+        Tegra::GPUVAddr offset = static_cast<Tegra::GPUVAddr>(entry.offset) << 0x10;
+
+        auto object = nvmap_dev->GetObject(entry.nvmap_handle);
+        ASSERT(object);
+
+        ASSERT(object->status == nvmap::Object::Status::Allocated);
+
+        u64 size = static_cast<u64>(entry.pages) << 0x10;
+        ASSERT(size <= object->size);
+
+        Tegra::GPUVAddr returned = gpu.memory_manager->MapBufferEx(object->addr, offset, size);
+        ASSERT(returned == offset);
+    }
+    std::memcpy(output.data(), entries.data(), output.size());
+    return 0;
+}
+
 u32 nvhost_as_gpu::MapBufferEx(const std::vector<u8>& input, std::vector<u8>& output) {
     IoctlMapBufferEx params{};
     std::memcpy(&params, input.data(), input.size());
diff --git a/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h b/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h
index d86c3ebd92..f2dd0c3b33 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h
+++ b/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h
@@ -26,6 +26,7 @@ private:
     enum class IoctlCommand : u32_le {
         IocInitalizeExCommand = 0x40284109,
         IocAllocateSpaceCommand = 0xC0184102,
+        IocRemapCommand = 0x00000014,
         IocMapBufferExCommand = 0xC0284106,
         IocBindChannelCommand = 0x40044101,
         IocGetVaRegionsCommand = 0xC0404108,
@@ -54,6 +55,16 @@ private:
     };
     static_assert(sizeof(IoctlAllocSpace) == 24, "IoctlInitalizeEx is incorrect size");
 
+    struct IoctlRemapEntry {
+        u16_le flags;
+        u16_le kind;
+        u32_le nvmap_handle;
+        INSERT_PADDING_WORDS(1);
+        u32_le offset;
+        u32_le pages;
+    };
+    static_assert(sizeof(IoctlRemapEntry) == 20, "IoctlRemapEntry is incorrect size");
+
     struct IoctlMapBufferEx {
         u32_le flags; // bit0: fixed_offset, bit2: cacheable
         u32_le kind;  // -1 is default
@@ -91,6 +102,7 @@ private:
 
     u32 InitalizeEx(const std::vector<u8>& input, std::vector<u8>& output);
     u32 AllocateSpace(const std::vector<u8>& input, std::vector<u8>& output);
+    u32 Remap(const std::vector<u8>& input, std::vector<u8>& output);
     u32 MapBufferEx(const std::vector<u8>& input, std::vector<u8>& output);
     u32 BindChannel(const std::vector<u8>& input, std::vector<u8>& output);
     u32 GetVARegions(const std::vector<u8>& input, std::vector<u8>& output);