From cb773a5558be7c797367b377728153032541e324 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 19 Oct 1998 19:39:49 +0000 Subject: Renamed bsp.texi to bsp.t. --- doc/supplements/sparc/bsp.texi | 106 ----------------------------------------- 1 file changed, 106 deletions(-) delete mode 100644 doc/supplements/sparc/bsp.texi (limited to 'doc/supplements/sparc') diff --git a/doc/supplements/sparc/bsp.texi b/doc/supplements/sparc/bsp.texi deleted file mode 100644 index 6930065cab..0000000000 --- a/doc/supplements/sparc/bsp.texi +++ /dev/null @@ -1,106 +0,0 @@ -@c -@c COPYRIGHT (c) 1988-1998. -@c On-Line Applications Research Corporation (OAR). -@c All rights reserved. -@c -@c $Id$ -@c - -@ifinfo -@node Board Support Packages, Board Support Packages Introduction, Default Fatal Error Processing Default Fatal Error Handler Operations, Top -@end ifinfo -@chapter Board Support Packages -@ifinfo -@menu -* Board Support Packages Introduction:: -* Board Support Packages System Reset:: -* Board Support Packages Processor Initialization:: -@end menu -@end ifinfo - -@ifinfo -@node Board Support Packages Introduction, Board Support Packages System Reset, Board Support Packages, Board Support Packages -@end ifinfo -@section Introduction - -An RTEMS Board Support Package (BSP) must be designed -to support a particular processor and target board combination. -This chapter presents a discussion of SPARC specific BSP issues. -For more information on developing a BSP, refer to the chapter -titled Board Support Packages in the RTEMS -Applications User's Guide. - -@ifinfo -@node Board Support Packages System Reset, Board Support Packages Processor Initialization, Board Support Packages Introduction, Board Support Packages -@end ifinfo -@section System Reset - -An RTEMS based application is initiated or -re-initiated when the SPARC processor is reset. When the SPARC -is reset, the processor performs the following actions: - -@itemize @bullet -@item the enable trap (ET) of the psr is set to 0 to disable -traps, - -@item the supervisor bit (S) of the psr is set to 1 to enter -supervisor mode, and - -@item the PC is set 0 and the nPC is set to 4. -@end itemize - -The processor then begins to execute the code at -location 0. It is important to note that all fields in the psr -are not explicitly set by the above steps and all other -registers retain their value from the previous execution mode. -This is true even of the Trap Base Register (TBR) whose contents -reflect the last trap which occurred before the reset. - -@ifinfo -@node Board Support Packages Processor Initialization, Processor Dependent Information Table, Board Support Packages System Reset, Board Support Packages -@end ifinfo -@section Processor Initialization - -It is the responsibility of the application's -initialization code to initialize the TBR and install trap -handlers for at least the register window overflow and register -window underflow conditions. Traps should be enabled before -invoking any subroutines to allow for register window -management. However, interrupts should be disabled by setting -the Processor Interrupt Level (pil) field of the psr to 15. -RTEMS installs it's own Trap Table as part of initialization -which is initialized with the contents of the Trap Table in -place when the @code{rtems_initialize_executive} directive was invoked. -Upon completion of executive initialization, interrupts are -enabled. - -If this SPARC implementation supports on-chip caching -and this is to be utilized, then it should be enabled during the -reset application initialization code. - -In addition to the requirements described in the -Board Support Packages chapter of the @value{LANGUAGE} -Applications User's Manual for the reset code -which is executed before the call to -@code{rtems_initialize_executive}, the SPARC version has the following -specific requirements: - -@itemize @bullet -@item Must leave the S bit of the status register set so that -the SPARC remains in the supervisor state. - -@item Must set stack pointer (sp) such that a minimum stack -size of MINIMUM_STACK_SIZE bytes is provided for the -@code{rtems_initialize_executive} directive. - -@item Must disable all external interrupts (i.e. set the pil -to 15). - -@item Must enable traps so window overflow and underflow -conditions can be properly handled. - -@item Must initialize the SPARC's initial trap table with at -least trap handlers for register window overflow and register -window underflow. -@end itemize - -- cgit v1.2.3