mirror of
https://github.com/xcat2/xNBA.git
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314 lines
8.2 KiB
C
314 lines
8.2 KiB
C
#ifndef COMPILER_H
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#define COMPILER_H
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/*
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* Doxygen can't cope with some of the more esoteric areas of C, so we
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* make its life simpler.
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*
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*/
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#ifdef DOXYGEN
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#define __attribute__(x)
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#endif
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/** @file
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*
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* Global compiler definitions.
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*
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* This file is implicitly included by every @c .c file in Etherboot.
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* It defines global macros such as DBG().
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*
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* We arrange for each object to export the symbol @c obj_OBJECT
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* (where @c OBJECT is the object name, e.g. @c rtl8139) as a global
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* symbol, so that the linker can drag in selected object files from
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* the library using <tt> -u obj_OBJECT </tt>.
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*
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*/
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/* Not quite sure why cpp requires two levels of macro call in order
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* to actually expand OBJECT...
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*/
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#undef _H1
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#define _H1( x, y ) x ## y
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#undef _H2
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#define _H2( x, y ) _H1 ( x, y )
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#define PREFIX_OBJECT(prefix) _H2 ( prefix, OBJECT )
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#define OBJECT_SYMBOL PREFIX_OBJECT(obj_)
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#undef _STR
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#define _STR(s) #s
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#undef _XSTR
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#define _XSTR(s) _STR(s)
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#define OBJECT_SYMBOL_STR _XSTR ( OBJECT_SYMBOL )
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#ifdef ASSEMBLY
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.globl OBJECT_SYMBOL
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.equ OBJECT_SYMBOL, 0
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#else /* ASSEMBLY */
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__asm__ ( ".globl\t" OBJECT_SYMBOL_STR );
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__asm__ ( ".equ\t" OBJECT_SYMBOL_STR ", 0" );
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/**
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* Drag in an object by object name.
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*
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* Macro to allow objects to explicitly drag in other objects by
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* object name. Used by config.c.
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*
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*/
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#define REQUIRE_OBJECT(object) \
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__asm__ ( ".equ\tneed_" #object ", obj_" #object );
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/** @def DBG
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*
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* Print a debugging message.
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*
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* The debug level is set at build time by specifying the @c DEBUG=
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* parameter on the @c make command line. For example, to enable
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* debugging for the PCI bus functions (in pci.c) in a @c .dsk image
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* for the @c rtl8139 card, you could use the command line
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*
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* @code
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*
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* make bin/rtl8139.dsk DEBUG=pci
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*
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* @endcode
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*
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* This will enable the debugging statements (DBG()) in pci.c. If
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* debugging is not enabled, DBG() statements will be ignored.
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*
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* You can enable debugging in several objects simultaneously by
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* separating them with commas, as in
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*
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* @code
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*
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* make bin/rtl8139.dsk DEBUG=pci,buffer,heap
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*
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* @endcode
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*
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* You can increase the debugging level for an object by specifying it
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* with @c :N, where @c N is the level, as in
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*
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* @code
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*
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* make bin/rtl8139.dsk DEBUG=pci,buffer:2,heap
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*
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* @endcode
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*
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* which would enable debugging for the PCI, buffer-handling and
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* heap-allocation code, with the buffer-handling code at level 2.
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*
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*/
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/*
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* If debug_OBJECT is set to a true value, the macro DBG(...) will
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* expand to printf(...) when compiling OBJECT, and the symbol
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* DEBUG_LEVEL will be inserted into the object file.
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*
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*/
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#define DEBUG_SYMBOL PREFIX_OBJECT(debug_)
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#if DEBUG_SYMBOL
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#define DEBUG_SYMBOL_STR _XSTR ( DEBUG_SYMBOL )
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__asm__ ( ".equ\tDBGLVL, " DEBUG_SYMBOL_STR );
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#endif
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/** printf() for debugging
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*
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* This function exists so that the DBG() macros can expand to
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* printf() calls without dragging the printf() prototype into scope.
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*
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* As far as the compiler is concerned, dbg_printf() and printf() are
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* completely unrelated calls; it's only at the assembly stage that
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* references to the dbg_printf symbol are collapsed into references
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* to the printf symbol.
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*/
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extern int __attribute__ (( format ( printf, 1, 2 ) ))
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dbg_printf ( const char *fmt, ... ) asm ( "printf" );
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extern void dbg_autocolourise ( unsigned long id );
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extern void dbg_decolourise ( void );
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extern void dbg_hex_dump_da ( unsigned long dispaddr,
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const void *data, unsigned long len );
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/* Compatibility with existing Makefile */
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#if DEBUG_SYMBOL
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#define DBGLVL DEBUG_SYMBOL
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#else
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#define DBGLVL 0
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#endif
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#define DBGLVL_LOG 1
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#define DBG_LOG ( DBGLVL & DBGLVL_LOG )
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#define DBGLVL_EXTRA 2
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#define DBG_EXTRA ( DBGLVL & DBGLVL_EXTRA )
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#define DBGLVL_PROFILE 4
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#define DBG_PROFILE ( DBGLVL & DBGLVL_PROFILE )
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/**
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* Print debugging message if we are at a certain debug level
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*
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* @v level Debug level
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* @v ... printf() argument list
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*/
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#define DBG_IF( level, ... ) do { \
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if ( DBG_ ## level ) { \
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dbg_printf ( __VA_ARGS__ ); \
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} \
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} while ( 0 )
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/**
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* Print a hex dump if we are at a certain debug level
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*
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* @v level Debug level
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* @v dispaddr Display address
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* @v data Data to print
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* @v len Length of data
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*/
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#define DBG_HDA_IF( level, dispaddr, data, len ) do { \
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if ( DBG_ ## level ) { \
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union { \
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unsigned long ul; \
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typeof ( dispaddr ) raw; \
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} da; \
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da.raw = dispaddr; \
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dbg_hex_dump_da ( da.ul, data, len ); \
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} \
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} while ( 0 )
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/**
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* Print a hex dump if we are at a certain debug level
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*
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* @v level Debug level
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* @v data Data to print
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* @v len Length of data
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*/
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#define DBG_HD_IF( level, data, len ) do { \
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DBG_HDA_IF ( level, data, data, len ); \
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} while ( 0 )
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/**
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* Select colour for debug messages if we are at a certain debug level
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*
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* @v level Debug level
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* @v id Message stream ID
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*/
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#define DBG_AC_IF( level, id ) do { \
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if ( DBG_ ## level ) { \
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union { \
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unsigned long ul; \
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typeof ( id ) raw; \
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} dbg_stream; \
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dbg_stream.raw = id; \
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dbg_autocolourise ( dbg_stream.ul ); \
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} \
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} while ( 0 )
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/**
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* Revert colour for debug messages if we are at a certain debug level
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*
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* @v level Debug level
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*/
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#define DBG_DC_IF( level ) do { \
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if ( DBG_ ## level ) { \
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dbg_decolourise(); \
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} \
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} while ( 0 )
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/* Autocolourising versions of the DBGxxx_IF() macros */
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#define DBGC_IF( level, id, ... ) do { \
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DBG_AC_IF ( level, id ); \
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DBG_IF ( level, __VA_ARGS__ ); \
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DBG_DC_IF ( level ); \
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} while ( 0 )
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#define DBGC_HDA_IF( level, id, ... ) do { \
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DBG_AC_IF ( level, id ); \
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DBG_HDA_IF ( level, __VA_ARGS__ ); \
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DBG_DC_IF ( level ); \
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} while ( 0 )
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#define DBGC_HD_IF( level, id, ... ) do { \
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DBG_AC_IF ( level, id ); \
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DBG_HD_IF ( level, __VA_ARGS__ ); \
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DBG_DC_IF ( level ); \
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} while ( 0 )
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/* Versions of the DBGxxx_IF() macros that imply DBGxxx_IF( LOG, ... )*/
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#define DBG( ... ) DBG_IF ( LOG, __VA_ARGS__ )
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#define DBG_HDA( ... ) DBG_HDA_IF ( LOG, __VA_ARGS__ )
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#define DBG_HD( ... ) DBG_HD_IF ( LOG, __VA_ARGS__ )
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#define DBGC( ... ) DBGC_IF ( LOG, __VA_ARGS__ )
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#define DBGC_HDA( ... ) DBGC_HDA_IF ( LOG, __VA_ARGS__ )
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#define DBGC_HD( ... ) DBGC_HD_IF ( LOG, __VA_ARGS__ )
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/* Versions of the DBGxxx_IF() macros that imply DBGxxx_IF( EXTRA, ... )*/
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#define DBG2( ... ) DBG_IF ( EXTRA, __VA_ARGS__ )
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#define DBG2_HDA( ... ) DBG_HDA_IF ( EXTRA, __VA_ARGS__ )
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#define DBG2_HD( ... ) DBG_HD_IF ( EXTRA, __VA_ARGS__ )
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#define DBGC2( ... ) DBGC_IF ( EXTRA, __VA_ARGS__ )
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#define DBGC2_HDA( ... ) DBGC_HDA_IF ( EXTRA, __VA_ARGS__ )
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#define DBGC2_HD( ... ) DBGC_HD_IF ( EXTRA, __VA_ARGS__ )
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/* Versions of the DBGxxx_IF() macros that imply DBGxxx_IF( PROFILE, ... )*/
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#define DBGP( ... ) DBG_IF ( PROFILE, __VA_ARGS__ )
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#define DBGP_HDA( ... ) DBG_HDA_IF ( PROFILE, __VA_ARGS__ )
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#define DBGP_HD( ... ) DBG_HD_IF ( PROFILE, __VA_ARGS__ )
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#define DBGCP( ... ) DBGC_IF ( PROFILE, __VA_ARGS__ )
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#define DBGCP_HDA( ... ) DBGC_HDA_IF ( PROFILE, __VA_ARGS__ )
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#define DBGCP_HD( ... ) DBGC_HD_IF ( PROFILE, __VA_ARGS__ )
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#if DEBUG_SYMBOL == 0
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#define NDEBUG
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#endif
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/** Select file identifier for errno.h (if used) */
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#define ERRFILE PREFIX_OBJECT ( ERRFILE_ )
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/** Declare a data structure as packed. */
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#define PACKED __attribute__ (( packed ))
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/** Declare a variable or data structure as unused. */
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#define __unused __attribute__ (( unused ))
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/**
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* Declare a function as used.
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*
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* Necessary only if the function is called only from assembler code.
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*/
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#define __used __attribute__ (( used ))
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/** Declare a data structure to be aligned with 16-byte alignment */
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#define __aligned __attribute__ (( aligned ( 16 ) ))
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/**
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* Shared data.
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*
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* To save space in the binary when multiple-driver images are
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* compiled, uninitialised data areas can be shared between drivers.
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* This will typically be used to share statically-allocated receive
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* and transmit buffers between drivers.
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*
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* Use as e.g.
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*
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* @code
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*
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* struct {
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* char rx_buf[NUM_RX_BUF][RX_BUF_SIZE];
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* char tx_buf[TX_BUF_SIZE];
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* } my_static_data __shared;
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*
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* @endcode
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*
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*/
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#define __shared __asm__ ( "_shared_bss" )
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#endif /* ASSEMBLY */
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#endif /* COMPILER_H */
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