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diff --git a/doc/cpu_supplement/v850.t b/doc/cpu_supplement/v850.t deleted file mode 100644 index ab844614f5..0000000000 --- a/doc/cpu_supplement/v850.t +++ /dev/null @@ -1,112 +0,0 @@ -@c -@c COPYRIGHT (c) 1988-2002. -@c On-Line Applications Research Corporation (OAR). -@c All rights reserved. - -@ifinfo -@end ifinfo -@chapter V850 Specific Information - -This chapter discusses the -@uref{http://en.wikipedia.org/wiki/V850,V850 architecture} -dependencies in this port of RTEMS. The V850 was originally manufactured -by NEC but is now part of the Renesas Electronics product line. - -@subheading Architecture Documents - -For information on the V850 architecture refer to the -@uref{http://am.renesas.com/products/mpumcu/v850/index.jsp,Renesas v850 product page}. - -@section CPU Model Dependent Features - -This section presents the set of features which vary across V850 implementations and are of importance to RTEMS. The set of CPU model feature macros are defined in the file @file{cpukit/score/cpu/v850/rtems/score/v850.h} based upon the particular CPU -model flags specified on the compilation command line. - -@subsection CPU Model Name - -The macro @code{CPU_MODEL_NAME} is a string which designates -the architectural level of this CPU model. See in -@file{cpukit/score/cpu/v850/rtems/score/v850.h} for the values. - -@subsection Count Leading Zeroes Instruction - -The V850v5 and later has the count leading zeroes @code{clz} instruction which -could be used to speed up the find first bit operation. The use of this -instruction should significantly speed up the scheduling associated with a -thread blocking. This is currently not used. - -@subsection Floating Point Unit - -A floating point unit is currently not supported. - -@section Calling Conventions - -Please refer to the -@uref{http://www.filibeto.org/unix/tru64/lib/ossc/doc/cygnus_doc-99r1/html/6_embed/embV850.html, -Procedure Call Standard for the V850 Architecture} or the GCC source -code for detailed information on the calling conventions. - -@subsection Register Usage - -Fixed registers are never available for register allocation in the -compiler. By default the following registers are fixed in GCC: - -@itemize @bullet -@item r0 (zero) -@item r3 (sp) -@item r4 (gp) -@item r30 (ep) -@end itemize - -@c r1 is mentioned as special purpose but I do not see a purpose - -Caller saved registers can be used by the compiler to hold values that -do not live across function calls. The caller saved registers are r2, -r5 through r19, and r31. - -Callee saved registers retain their value across function calls. The -callee saved registers are r20 through r29. - -r6 through r9 are parameter registers while r10 and r11 are function return registers. r31 is the return pointer. - -r29 is used as the frame pointer in some functions. - -@section Memory Model - -A flat 32-bit memory model is supported. - -@section Interrupt Processing - -The V850 architecture has ... - -@subsection Interrupt Levels - -The RTEMS interrupt level mapping scheme for the V850 is very simple. If -the requested interrupt level is 1, then interrupts are disabled in the -PSW register using the @code{di} instruction. If the requested interrupt -level is 0, then interrupts are enabled in the PSW register using the -@code{ei} instruction or restoring the previous value of the PSW register. - -@subsection Interrupt Stack - -The board support package must initialize the interrupt stack. The memory for -the stacks is usually reserved in the linker script. - -@section Default Fatal Error Processing - -The default fatal error handler for this architecture performs the -following actions: - -@itemize @bullet -@item disables operating system supported interrupts (IRQ), -@item places the error code in @code{r10}, and -@item executes a halt processor instruction. -@end itemize - -@section Symmetric Multiprocessing - -SMP is not supported. - -@section Thread-Local Storage - -Thread-local storage is not implemented. |