Difference between revisions of "IPC"
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(Created page with "Every RPC command sent to services starts with a u32 header code: {| class="wikitable" border="1" |- ! Bits ! Description |- | 0-5 | Number of translate parameters (=x) |- | 6...") |
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Translate parameters are modified/translated transparently by the kernel. They are used to transfer handles/buffers between the different processes. | Translate parameters are modified/translated transparently by the kernel. They are used to transfer handles/buffers between the different processes. | ||
| − | + | The type of parameter is described by the bits 1-3 in the translation descriptor. Parameter types accepted by the kernel are: 0, 1, (2?), 5, 6, 7. | |
| + | |||
| + | The number of parameters covered by a descriptor is type-dependent: | ||
| + | Type 0: | ||
| + | length = (desc >> 26) + 1 | ||
| + | Type 1, (2?), 5, 6, 7: | ||
| + | length = 1 | ||
| + | |||
| + | Type 0 does the following: | ||
| + | if desc & 0x30 == 0x20: | ||
| + | write process id to value | ||
| + | else: | ||
| + | translate handle | ||
| + | if desc & 0x30 == 0x10: | ||
| + | close handle for caller | ||
| + | |||
| + | -- | ||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
Revision as of 00:48, 27 April 2014
Every RPC command sent to services starts with a u32 header code:
| Bits | Description |
|---|---|
| 0-5 | Number of translate parameters (=x) |
| 6-15 | Number of normal parameters (=y) |
| 16-23 | Command ID |
| 24-31 | Unknown |
The entire command has the following structure:
| Word | Size | Description |
|---|---|---|
| 0 | 1 | Header code |
| 1 | x | Normal parameters |
| x | y | Translate parameters |
Translate parameters are modified/translated transparently by the kernel. They are used to transfer handles/buffers between the different processes.
The type of parameter is described by the bits 1-3 in the translation descriptor. Parameter types accepted by the kernel are: 0, 1, (2?), 5, 6, 7.
The number of parameters covered by a descriptor is type-dependent:
Type 0:
length = (desc >> 26) + 1
Type 1, (2?), 5, 6, 7:
length = 1
Type 0 does the following:
if desc & 0x30 == 0x20:
write process id to value
else:
translate handle
if desc & 0x30 == 0x10:
close handle for caller
--
| Descriptor | Description |
|---|---|
| 0x00000000 | The corresponding value is a KHandle |
| 0x00000010 | The corresponding value is a KHandle, that should not be closed locally? |
| 0x00000020 | Let kernel set value to local ProcessID |
| 0x0000???2 | (size<<14) | The corresponding value contains a ptr to a buffer of said size. |
| 0x0000000A | (size<<4) | The corresponding value contains a ptr to a buffer of said size. |
| 0x0000000C | (size<<4) | The corresponding value contains a ptr to a buffer of said size. |