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IPC helpers

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This commit is contained in:
Lectem 2016-12-26 13:39:45 +01:00
parent 51dd13b8a0
commit 8f2b642415
3 changed files with 323 additions and 48 deletions
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111
src/core/hle/ipc.h
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@ -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