libctru v2.5.0
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ipc.h
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1/**
2 * @file ipc.h
3 * @brief Inter Process Communication helpers
4 */
5#pragma once
6
7#include <3ds/types.h>
8
9/// IPC buffer access rights.
10typedef enum
11{
12 IPC_BUFFER_R = BIT(1), ///< Readable
13 IPC_BUFFER_W = BIT(2), ///< Writable
14 IPC_BUFFER_RW = IPC_BUFFER_R | IPC_BUFFER_W ///< Readable and Writable
16
17/**
18 * @brief Creates a command header to be used for IPC
19 * @param command_id ID of the command to create a header for.
20 * @param normal_params Size of the normal parameters in words. Up to 63.
21 * @param translate_params Size of the translate parameters in words. Up to 63.
22 * @return The created IPC header.
23 *
24 * Normal parameters are sent directly to the process while the translate parameters might go through modifications and checks by the kernel.
25 * The translate parameters are described by headers generated with the IPC_Desc_* functions.
26 *
27 * @note While #normal_params is equivalent to the number of normal parameters, #translate_params includes the size occupied by the translate parameters headers.
28 */
29static inline u32 IPC_MakeHeader(u16 command_id, unsigned normal_params, unsigned translate_params)
30{
31 return ((u32) command_id << 16) | (((u32) normal_params & 0x3F) << 6) | (((u32) translate_params & 0x3F) << 0);
32}
33
34/**
35 * @brief Creates a header to share handles
36 * @param number The number of handles following this header. Max 64.
37 * @return The created shared handles header.
38 *
39 * The #number next values are handles that will be shared between the two processes.
40 *
41 * @note Zero values will have no effect.
42 */
43static inline u32 IPC_Desc_SharedHandles(unsigned number)
44{
45 return ((u32)(number - 1) << 26);
46}
47
48/**
49 * @brief Creates the header to transfer handle ownership
50 * @param number The number of handles following this header. Max 64.
51 * @return The created handle transfer header.
52 *
53 * The #number next values are handles that will be duplicated and closed by the other process.
54 *
55 * @note Zero values will have no effect.
56 */
57static inline u32 IPC_Desc_MoveHandles(unsigned number)
58{
59 return ((u32)(number - 1) << 26) | 0x10;
60}
61
62/**
63 * @brief Returns the code to ask the kernel to fill the handle with the current process ID.
64 * @return The code to request the current process ID.
65 *
66 * The next value is a placeholder that will be replaced by the current process ID by the kernel.
67 */
68static inline u32 IPC_Desc_CurProcessId(void)
69{
70 return 0x20;
71}
72
73static inline CTR_DEPRECATED u32 IPC_Desc_CurProcessHandle(void)
74{
75 return IPC_Desc_CurProcessId();
76}
77
78/**
79 * @brief Creates a header describing a static buffer.
80 * @param size Size of the buffer. Max ?0x03FFFF?.
81 * @param buffer_id The Id of the buffer. Max 0xF.
82 * @return The created static buffer header.
83 *
84 * The next value is a pointer to the buffer. It will be copied to TLS offset 0x180 + static_buffer_id*8.
85 */
86static inline u32 IPC_Desc_StaticBuffer(size_t size, unsigned buffer_id)
87{
88 return (size << 14) | ((buffer_id & 0xF) << 10) | 0x2;
89}
90
91/**
92 * @brief Creates a header describing a buffer to be sent over PXI.
93 * @param size Size of the buffer. Max 0x00FFFFFF.
94 * @param buffer_id The Id of the buffer. Max 0xF.
95 * @param is_read_only true if the buffer is read-only. If false, the buffer is considered to have read-write access.
96 * @return The created PXI buffer header.
97 *
98 * The next value is a phys-address of a table located in the BASE memregion.
99 */
100static inline u32 IPC_Desc_PXIBuffer(size_t size, unsigned buffer_id, bool is_read_only)
101{
102 u8 type = 0x4;
103 if(is_read_only)type = 0x6;
104 return (size << 8) | ((buffer_id & 0xF) << 4) | type;
105}
106
107/**
108 * @brief Creates a header describing a buffer from the main memory.
109 * @param size Size of the buffer. Max 0x0FFFFFFF.
110 * @param rights The rights of the buffer for the destination process.
111 * @return The created buffer header.
112 *
113 * The next value is a pointer to the buffer.
114 */
115static inline u32 IPC_Desc_Buffer(size_t size, IPC_BufferRights rights)
116{
117 return (size << 4) | 0x8 | rights;
118}
static u32 IPC_Desc_SharedHandles(unsigned number)
Creates a header to share handles.
Definition ipc.h:43
static u32 IPC_Desc_StaticBuffer(size_t size, unsigned buffer_id)
Creates a header describing a static buffer.
Definition ipc.h:86
static u32 IPC_Desc_MoveHandles(unsigned number)
Creates the header to transfer handle ownership.
Definition ipc.h:57
static u32 IPC_Desc_CurProcessId(void)
Returns the code to ask the kernel to fill the handle with the current process ID.
Definition ipc.h:68
static u32 IPC_MakeHeader(u16 command_id, unsigned normal_params, unsigned translate_params)
Creates a command header to be used for IPC.
Definition ipc.h:29
static u32 IPC_Desc_Buffer(size_t size, IPC_BufferRights rights)
Creates a header describing a buffer from the main memory.
Definition ipc.h:115
IPC_BufferRights
IPC buffer access rights.
Definition ipc.h:11
@ IPC_BUFFER_W
Writable.
Definition ipc.h:13
@ IPC_BUFFER_RW
Readable and Writable.
Definition ipc.h:14
@ IPC_BUFFER_R
Readable.
Definition ipc.h:12
static u32 IPC_Desc_PXIBuffer(size_t size, unsigned buffer_id, bool is_read_only)
Creates a header describing a buffer to be sent over PXI.
Definition ipc.h:100
Various system types.
#define CTR_DEPRECATED
Flags a function as deprecated.
Definition types.h:56
#define BIT(n)
Creates a bitmask from a bit number.
Definition types.h:47
uint8_t u8
would be nice if newlib had this already
Definition types.h:21
uint16_t u16
16-bit unsigned integer
Definition types.h:22
uint32_t u32
32-bit unsigned integer
Definition types.h:23