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Hermès Bélusca-Maïto
56347a8b98
Reintroduce CSR support for kernel mode, based on code from Ge that was wiped out in revision 58770, and by ntdll CSR code. Is needed for kernel to user-mode CSR callbacks.
For readers, I remind you the big callback picture in the Win32 subsystem:
- In Windows NT 3.1 and 3.51, USER and GDI was modeled against client/server model (USER32.DLL and WINSRV.DLL, and GDI32.DLL and GDISRV.DLL), all running in user mode (using the CSR API).
- Starting Windows NT 4.0 (and up), some USER and GDI parts were moved into kernel mode (in the WIN32K.SYS driver) to speedup communication. We get:
* GDI32.DLL as the client, doing win32k system calls (kernel-mode system calls to win32k),
* and USER32.DLL, WINSRV.DLL and WIN32K.SYS working in tandem, USER32.DLL being the client and {WINSRV.DLL, WIN32K.SYS} being the server.
USER32.DLL can do win32k system calls or CSR calls to WINSRV.DLL (client to server calls). For server-to-server calls, we have WINSRV.DLL
doing win32k system calls, or WIN32K.SYS doing CSR calls back to WINSRV.DLL . Also, there is the possibility for WIN32K.SYS to make user-mode
callbacks to USER32.DLL.
svn path=/trunk/; revision=65817