bootinit.c

VxWorks BSP 下s3C44b0的源代码

/* bootInit.c - ROM initialization module */

/* Copyright 1989-2002 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
05h,26mar02,sbs  correcting data section relocation for ROM compressed images
                 (SPR 73785)
05g,19mar02,dat  Removing previous fix for MIPS, no longer needed (72825)
05f,18jan02,dat  Don't use loop unrolling for MIPS
05f,22jan02,scm  Xscale specific validation added to update cache (to match
                 updates...)
05e,19dec01,aeg  prevented pc-relative addressing on MC680X0.
05d,10dec01,sbs  Corrected conditions around call to copyLongs for ROM 
                 resident images.
05c,27nov01,sbs  Added new labels, wrs_kernel_data_start and wrs_kernel_data_end
                 for sdata and edata respectively. Added second copy for data 
		 section of compressed ROM images. Corrected definition for 
                 binArrayEnd. Corrected definition for RESIDENT_DATA.
05b,27nov01,tpw  Manually unroll copyLongs and fillLongs.
05a,25oct01,pad  Removed definitions of _binArrayStart and _binArrayEnd, now
                 unnecessary.
04z,03oct01,dee  Merge from ColdFire T2.1.0 release
04y,11jan01,scm  Xscale specific validation added to update cache, can not assume uncached area....
04x,10jun99,jpd  fix error when BOOTCODE_IN_RAM defined (SPR #27775).
04w,13nov98,cdp  make Thumb support for ARM CPUs dependent on ARM_THUMB.
04w,10feb99,db   Fix to ensure that default bootline gets copied for
		 standalone and rom-resident images(SPR #21763).
04v,05oct98,jmp  doc: cleanup.
04u,17apr98,cdp  backed out 04t and made absEntry volatile for ARM.
04t,16apr98,cdp  for ARM, make UNCOMPRESS entry point in RAM.
04s,20mar98,cdp  make ROM_COPY_SIZE subject to #ifndef.
04r,11nov97,cdp  ARM7TDMI_T: force romStart to call entry point in Thumb state.
		 (SPR# 9716)
04q,14jul97,tam  changed remaining references to bfillLong to fillLong. 
04p,12feb97,dat  Added USER_RESERVED_MEM, SYS_MEM_TOP, SYS_MEM_BOTTOM, SPR 8030
04o,04feb97,ms   fixed compiler warning about protoype for bcopyLongs.
04o,28nov96,cdp  added ARM support.
04n,03sep96,hdn  added the compression support for pc[34]86 BSP.
04m,19aug96,ms   added UNCMP_RTN macro to use inflate instead of uncompress
04l,21jun96,jmb  long modhist -- deleted entries prior to 1994.  SPR #6528
03k,10jun96,tam  added rom resident support for PPC architecture. 
03j,14may96,dat  fixed compiler warnings for copyLongs, fillLongs. SPR #6536
03i,06mar96,tpr  changed absEntry to be volatile for PowerPC.
03h,22aug95,hdn  added support for I80X86.
03g,14mar95,caf  restored mips resident rom support (SPR #3856).
03f,16feb95,jdi  doc format change.
03f,23may95,yao  define binArrayStart and binArrayEnd for PowerPC
		 because tools don't prepend "_".
03e,09dec94,caf  undid mod 03a, use sdata for resident roms (SPR #3856).
03d,22jun94,caf  undid 16-byte alignment portion of mod 03c, below.
03c,14jun94,cd   corrected definitions of etext, edata and end.
	   +caf  for R4000 resident ROMs: data starts on 16-byte boundary.
		 for R4000 uncompressed ROMs: added volatile to absEntry type.
*/

/*
DESCRIPTION
This module provides a generic boot ROM facility.  The target-specific
romInit.s module performs the minimal preliminary board initialization and
then jumps to the C routine romStart().  This routine, still executing out
of ROM, copies the first stage of the startup code to a RAM address and
jumps to it.  The next stage clears memory and then uncompresses the
remainder of ROM into the final VxWorks ROM image in RAM.

A modified version of the Public Domain \f3zlib\fP library is used to
uncompress the VxWorks boot ROM executable linked with it.  Compressing
object code typically achieves over 55% compression, permitting much
larger systems to be burned into ROM.  The only expense is the added few
seconds delay while the first two stages complete.

ROM AND RAM MEMORY LAYOUT
Example memory layout for a 1-megabyte board:
.CS
    --------------  0x00100000 = LOCAL_MEM_SIZE = sysMemTop()
    |            |
    |    RAM     |
    |  0 filled  |
    |            |
    |------------| = (romInit+ROM_COPY_SIZE) or binArrayStart
    | ROM image  |
    |----------- |  0x00090000  = RAM_HIGH_ADRS
    | STACK_SAVE |
    |------------|
    |            |  0x00080000  = 0.5 Megabytes
    |            |
    |            |
    | 0 filled   |
    |            |
    |            |  0x00001000  = RAM_ADRS & RAM_LOW_ADRS
    |            |
    |            |  exc vectors, bp anchor, exc msg, bootline
    |            |
    |            |
    --------------  0x00000000  = LOCAL_MEM_LOCAL_ADRS
.CE
.CS
    --------------
    |    ROM     |
    |            |  0xff8xxxxx  = binArrayStart
    |            |
    |            |  0xff800008  = ROM_TEXT_ADRS
    --------------  0xff800000  = ROM_BASE_ADRS
.CE

SEE ALSO:
inflate(), romInit(), and deflate

AUTHOR
The original compression software for zlib was written by Jean-loup Gailly
and Mark Adler. See the manual pages of inflate and deflate for
more information on their freely available compression software.
*/

#include "vxWorks.h"
#include "sysLib.h"
#include "config.h"
#include "errno.h"
#include "sioLib.h"

#define	UNCMP_RTN	inflate

#ifndef USER_RESERVED_MEM
#   define USER_RESERVED_MEM 0
#endif

/*
 * If memory is to be cleared, it will be cleared from SYS_MEM_BOTTOM
 * up to (but not including) SYS_MEM_TOP, except for text and data segments.
 * The user reserved area is not cleared.
 */

#define	SYS_MEM_TOP \
	(LOCAL_MEM_LOCAL_ADRS + LOCAL_MEM_SIZE - USER_RESERVED_MEM)

#define SYS_MEM_BOTTOM \
	(LOCAL_MEM_LOCAL_ADRS + RESERVED)

#define BINARRAYEND_ROUNDOFF	(ROUND_DOWN(binArrayEnd, sizeof(long))) 

IMPORT void	romInit ();
IMPORT STATUS	UNCMP_RTN ();
IMPORT void	usrInit ();
IMPORT void	sysInitAlt ();
IMPORT void	start ();

IMPORT UCHAR	binArrayStart [];	/* compressed binary image */
IMPORT UCHAR	binArrayEnd [];		/* end of compressed binary image */
IMPORT char	etext [];		/* defined by the loader */
IMPORT char	end [];			/* defined by the loader */
IMPORT UCHAR	wrs_kernel_data_start [];  /* defined by the loader */
IMPORT UCHAR	wrs_kernel_data_end [];    /* defined by the loader */

#if	((CPU_FAMILY == MIPS) || (CPU_FAMILY==PPC) || \
	 (CPU_FAMILY==COLDFIRE))
#define	RESIDENT_DATA	RAM_DST_ADRS
#else
#define	RESIDENT_DATA 	wrs_kernel_data_start	
#endif

#ifndef RAM_DST_ADRS                	/* default uncompress dest. */
#define RAM_DST_ADRS        RAM_HIGH_ADRS
#endif

/* If the boot code is in RAM and the RAM is already initialized,
 * clearing the RAM is not necessary.  Macro BOOTCODE_IN_RAM is
 * used not to clear the RAM.
 */
#ifdef	BOOTCODE_IN_RAM			/* not to clear RAM */
#undef	ROM_TEXT_ADRS
#undef	ROM_BASE_ADRS
#define	ROM_TEXT_ADRS	((UINT)romInit)
#define	ROM_BASE_ADRS	((UINT)romInit)
#endif	/* BOOTCODE_IN_RAM */

/* #if	defined (UNCOMPRESS) || defined (ROM_RESIDENT) */
#ifndef ROM_COPY_SIZE
#define	ROM_COPY_SIZE	(ROM_SIZE - (ROM_TEXT_ADRS - ROM_BASE_ADRS))
#endif
/* #endif*/	/* UNCOMPRESS */

#define ROM_OFFSET(adr)	(((UINT)adr - (UINT)romInit) + ROM_TEXT_ADRS)

/* forward declarations */

LOCAL void copyLongs (FAST UINT *source, FAST UINT *destination, UINT nlongs);
#ifndef	BOOTCODE_IN_RAM
LOCAL void fillLongs (FAST UINT *buf, UINT nlongs, FAST UINT val);
#endif	/* BOOTCODE_IN_RAM */
#if (CPU==XSCALE)
int checkLongs (FAST UINT *source, FAST UINT *destination, UINT nlongs);
#endif

/*******************************************************************************
*
* romStart - generic ROM initialization
*
* This is the first C code executed after reset.
*
* This routine is called by the assembly start-up code in romInit().
* It clears memory, copies ROM to RAM, and possibly invokes the uncompressor.
* It then jumps to the entry point of the uncompressed object code.
*
* RETURNS: N/A
*/

void romStart
    (
    FAST int startType		/* start type */
    )

    {
#if ((CPU_FAMILY==SPARC) || (CPU_FAMILY==MIPS) || (CPU_FAMILY==I80X86) || \
     (CPU_FAMILY==PPC) || (CPU_FAMILY==ARM))
    volatile			/* to force absolute adressing */
#endif /* (CPU_FAMILY==SPARC) */
    FUNCPTR absEntry;		/* to avoid PC Relative Jump Subroutine */
#if (CPU_FAMILY==ARM) && (!defined(ROM_RESIDENT)) && !defined(BOOTCODE_IN_RAM)
    VOIDFUNCPTR ramfillLongs = fillLongs;     /* force call to RAM */
#define fillLongs(a,b,c) ramfillLongs(a,b,c)
#endif  /* (CPU_FAMILY==ARM) */
#if (CPU_FAMILY==MC680X0) && !defined(ROM_RESIDENT) && !defined(BOOTCODE_IN_RAM)
    volatile VOIDFUNCPTR romcopyLongs = &copyLongs;  /* force call to ROM */
#define copyLongs romcopyLongs
#endif /* (CPU_FAMILY==MC680X0) */
    /*
     * Copy from ROM to RAM, minus the compressed image
     * if compressed boot ROM which relies on binArray
     * appearing last in DATA segment.
     */

#ifdef ROM_RESIDENT
    /* If ROM resident code, then copy only data segment
     * from ROM to RAM, initialize memory and jump
     * to usrInit.
     */

    
#if  (CPU_FAMILY == SPARC)
    copyLongs ((UINT *)(etext + 8), (UINT *) RESIDENT_DATA,
#else
    copyLongs ((UINT *)etext, (UINT *) RESIDENT_DATA,
#endif
        ((UINT) wrs_kernel_data_end - (UINT) RESIDENT_DATA) / sizeof (long));

#else	/* ROM_RESIDENT */

#ifdef UNCOMPRESS

#if	(CPU_FAMILY == MIPS)
    /*
     * copy text to uncached locations to avoid problems with
     * copy back caches