IPC helpers

1 files changed, 63 insertions, 48 deletions

diff --git a/src/core/hle/ipc.h b/src/core/hle/ipc.h
index 4e094faa7..4f7e5d050 100644
--- a/src/core/hle/ipc.h
+++ b/src/core/hle/ipc.h
@@ -18,12 +18,26 @@ static const int kCommandHeaderOffset = 0x80; ///< Offset into command buffer of
  * the thread's TLS to an intermediate buffer in kernel memory, and then copied again to
  * the service handler process' memory.
  * @param offset Optional offset into command buffer
+ * @param offset Optional offset into command buffer (in bytes)
  * @return Pointer to command buffer
  */
 inline u32* GetCommandBuffer(const int offset = 0) {
     return (u32*)Memory::GetPointer(GetCurrentThread()->GetTLSAddress() + kCommandHeaderOffset +
                                     offset);
 }
+
+static const int kStaticBuffersOffset =
+    0x100; ///< Offset into static buffers, relative to command buffer header
+
+/**
+ * Returns a pointer to the static buffers area in the current thread's TLS
+ * TODO(Subv): cf. GetCommandBuffer
+ * @param offset Optional offset into static buffers area (in bytes)
+ * @return Pointer to static buffers area
+ */
+inline u32* GetStaticBuffers(const int offset = 0) {
+    return GetCommandBuffer(kStaticBuffersOffset + offset);
+}
 }
 
 namespace IPC {
@@ -40,35 +54,34 @@ enum DescriptorType : u32 {
     CallingPid = 0x20,
 };
 
-/**
- * @brief Creates a command header to be used for IPC
- * @param command_id            ID of the command to create a header for.
- * @param normal_params         Size of the normal parameters in words. Up to 63.
- * @param translate_params_size Size of the translate parameters in words. Up to 63.
- * @return The created IPC header.
- *
- * Normal parameters are sent directly to the process while the translate parameters might go
- * through modifications and checks by the kernel.
- * The translate parameters are described by headers generated with the IPC::*Desc functions.
- *
- * @note While #normal_params is equivalent to the number of normal parameters,
- * #translate_params_size includes the size occupied by the translate parameters headers.
- */
-constexpr u32 MakeHeader(u16 command_id, unsigned int normal_params,
-                         unsigned int translate_params_size) {
-    return (u32(command_id) << 16) | ((u32(normal_params) & 0x3F) << 6) |
-           (u32(translate_params_size) & 0x3F);
-}
-
 union Header {
     u32 raw;
     BitField<0, 6, u32> translate_params_size;
-    BitField<6, 6, u32> normal_params;
+    BitField<6, 6, u32> normal_params_size;
     BitField<16, 16, u32> command_id;
 };
 
-inline Header ParseHeader(u32 header) {
-    return {header};
+/**
+* @brief Creates a command header to be used for IPC
+* @param command_id            ID of the command to create a header for.
+* @param normal_params_size         Size of the normal parameters in words. Up to 63.
+* @param translate_params_size Size of the translate parameters in words. Up to 63.
+* @return The created IPC header.
+*
+* Normal parameters are sent directly to the process while the translate parameters might go
+* through modifications and checks by the kernel.
+* The translate parameters are described by headers generated with the IPC::*Desc functions.
+*
+* @note While #normal_params_size is equivalent to the number of normal parameters,
+* #translate_params_size includes the size occupied by the translate parameters headers.
+*/
+inline u32 MakeHeader(u16 command_id, unsigned int normal_params_size,
+                      unsigned int translate_params_size) {
+    Header header;
+    header.command_id.Assign(command_id);
+    header.normal_params_size.Assign(normal_params_size);
+    header.translate_params_size.Assign(translate_params_size);
+    return header.raw;
 }
 
 constexpr u32 MoveHandleDesc(u32 num_handles = 1) {
@@ -83,7 +96,7 @@ constexpr u32 CallingPidDesc() {
     return CallingPid;
 }
 
-constexpr bool isHandleDescriptor(u32 descriptor) {
+constexpr bool IsHandleDescriptor(u32 descriptor) {
     return (descriptor & 0xF) == 0x0;
 }
 
@@ -91,30 +104,31 @@ constexpr u32 HandleNumberFromDesc(u32 handle_descriptor) {
     return (handle_descriptor >> 26) + 1;
 }
 
-constexpr u32 StaticBufferDesc(u32 size, u8 buffer_id) {
-    return StaticBuffer | (size << 14) | ((buffer_id & 0xF) << 10);
-}
-
 union StaticBufferDescInfo {
     u32 raw;
+    BitField<0, 4, u32> descriptor_type;
     BitField<10, 4, u32> buffer_id;
     BitField<14, 18, u32> size;
 };
 
-inline StaticBufferDescInfo ParseStaticBufferDesc(const u32 desc) {
-    return {desc};
+inline u32 StaticBufferDesc(u32 size, u8 buffer_id) {
+    StaticBufferDescInfo info;
+    info.descriptor_type.Assign(StaticBuffer);
+    info.buffer_id.Assign(buffer_id);
+    info.size.Assign(size);
+    return info.raw;
 }
 
 /**
- * @brief Creates a header describing a buffer to be sent over PXI.
- * @param size         Size of the buffer. Max 0x00FFFFFF.
- * @param buffer_id    The Id of the buffer. Max 0xF.
- * @param is_read_only true if the buffer is read-only. If false, the buffer is considered to have
- * read-write access.
- * @return The created PXI buffer header.
- *
- * The next value is a phys-address of a table located in the BASE memregion.
- */
+* @brief Creates a header describing a buffer to be sent over PXI.
+* @param size         Size of the buffer. Max 0x00FFFFFF.
+* @param buffer_id    The Id of the buffer. Max 0xF.
+* @param is_read_only true if the buffer is read-only. If false, the buffer is considered to have
+* read-write access.
+* @return The created PXI buffer header.
+*
+* The next value is a phys-address of a table located in the BASE memregion.
+*/
 inline u32 PXIBufferDesc(u32 size, unsigned buffer_id, bool is_read_only) {
     u32 type = PXIBuffer;
     if (is_read_only)
@@ -122,29 +136,30 @@ inline u32 PXIBufferDesc(u32 size, unsigned buffer_id, bool is_read_only) {
     return type | (size << 8) | ((buffer_id & 0xF) << 4);
 }
 
-enum MappedBufferPermissions {
+enum MappedBufferPermissions : u32 {
     R = 1,
     W = 2,
     RW = R | W,
 };
 
-constexpr u32 MappedBufferDesc(u32 size, MappedBufferPermissions perms) {
-    return MappedBuffer | (size << 4) | (u32(perms) << 1);
-}
-
 union MappedBufferDescInfo {
     u32 raw;
-    BitField<4, 28, u32> size;
+    BitField<0, 4, u32> flags;
     BitField<1, 2, MappedBufferPermissions> perms;
+    BitField<4, 28, u32> size;
 };
 
-inline MappedBufferDescInfo ParseMappedBufferDesc(const u32 desc) {
-    return {desc};
+inline u32 MappedBufferDesc(u32 size, MappedBufferPermissions perms) {
+    MappedBufferDescInfo info;
+    info.flags.Assign(MappedBuffer);
+    info.perms.Assign(perms);
+    info.size.Assign(size);
+    return info.raw;
 }
 
 inline DescriptorType GetDescriptorType(u32 descriptor) {
     // Note: Those checks must be done in this order
-    if (isHandleDescriptor(descriptor))
+    if (IsHandleDescriptor(descriptor))
         return (DescriptorType)(descriptor & 0x30);
 
     // handle the fact that the following descriptors can have rights