redboot_linux_exec.c

开放源码实时操作系统源码.

//==========================================================================
//
//      redboot_linux_boot.c
//
//      RedBoot command to boot Linux on ARM platforms
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
// Copyright (C) 2003, 2004 Gary Thomas
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//####OTHERCOPYRIGHTBEGIN####
//
//  The structure definitions below are taken from include/asm-arm/setup.h in
//  the Linux kernel, Copyright (C) 1997-1999 Russell King. Their presence
//  here is for the express purpose of communication with the Linux kernel
//  being booted and is considered 'fair use' by the original author and
//  are included with his permission.
//
//####OTHERCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas, jskov,
//               Russell King <[e-mail]>
// Date:         2001-02-20
// Purpose:      
// Description:  
//              
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/hal.h>
#include <redboot.h>

#ifdef CYGPKG_IO_ETH_DRIVERS
#include <cyg/io/eth/eth_drv.h>            // Logical driver interfaces
#endif

#include <cyg/hal/hal_intr.h>
#include <cyg/hal/hal_cache.h>
#include CYGHWR_MEMORY_LAYOUT_H

#include <cyg/hal/hal_io.h>

#ifndef CYGARC_PHYSICAL_ADDRESS
# error
# define CYGARC_PHYSICAL_ADDRESS(x) (x)
#endif

// FIXME: This should be a CDL variable, and CYGSEM_REDBOOT_ARM_LINUX_BOOT
//        active_if  CYGHWR_HAL_ARM_REDBOOT_MACHINE_TYPE>0
#ifdef HAL_PLATFORM_MACHINE_TYPE
#define CYGHWR_REDBOOT_ARM_MACHINE_TYPE HAL_PLATFORM_MACHINE_TYPE

// Exported CLI function(s)
static void do_exec(int argc, char *argv[]);
RedBoot_cmd("exec", 
            "Execute an image - with MMU off", 
            "[-w timeout] [-b <load addr> [-l <length>]]\n"
            "        [-r <ramdisk addr> [-s <ramdisk length>]]\n"
            "        [-c \"kernel command line\"] [-t <target> ] [<entry_point>]",
            do_exec
    );

// CYGARC_HAL_MMU_OFF inserts code to turn off MMU and jump to a physical
// address. Some ARM implementations may need special handling and define
// their own version.
#ifndef CYGARC_HAL_MMU_OFF

#define __CYGARC_GET_CTLREG \
              "   mrc p15,0,r0,c1,c0,0\n"

#define __CYGARC_CLR_MMU_BITS         \
  "   bic r0,r0,#0xd\n"               \
  "   bic r0,r0,#0x1000\n"            \

#ifdef CYGHWR_HAL_ARM_BIGENDIAN
#define __CYGARC_CLR_MMU_BITS_X       \
  "   bic r0,r0,#0x8d\n"              \
  "   bic r0,r0,#0x1000\n"
#else
#define __CYGARC_CLR_MMU_BITS_X       \
  "   bic r0,r0,#0xd\n"               \
  "   bic r0,r0,#0x1000\n"            \
  "   orr r0,r0,#0x80\n"
#endif

#define __CYGARC_SET_CTLREG(__paddr__) \
  "   mcr p15,0,r0,c1,c0,0\n"          \
  "   mov pc," #__paddr__ "\n"

#define CYGARC_HAL_MMU_OFF(__paddr__)  \
  "   mcr p15,0,r0,c7,c10,4\n"         \
  "   mcr p15,0,r0,c7,c7,0\n"          \
  __CYGARC_GET_CTLREG                  \
  __CYGARC_CLR_MMU_BITS                \
  __CYGARC_SET_CTLREG(__paddr__)

#define CYGARC_HAL_MMU_OFF_X(__paddr__)  \
  "   mcr p15,0,r0,c7,c10,4\n"           \
  "   mcr p15,0,r0,c7,c7,0\n"            \
  __CYGARC_GET_CTLREG                    \
  __CYGARC_CLR_MMU_BITS_X                \
  __CYGARC_SET_CTLREG(__paddr__)

#endif  // CYGARC_HAL_MMU_OFF

//
// Parameter info for Linux kernel
//   ** C A U T I O N **  This setup must match "asm-arm/setup.h"
//
// Info is passed at a fixed location, using a sequence of tagged
// data entries.
//

typedef unsigned long  u32;
typedef unsigned short u16;
typedef unsigned char  u8;

//=========================================================================
//  From Linux <asm-arm/setup.h>

#define ATAG_NONE	0x00000000
struct tag_header {
    u32 size;    // Size of tag (hdr+data) in *longwords*
    u32 tag;
};

#define ATAG_CORE	0x54410001
struct tag_core {
    u32 flags;		/* bit 0 = read-only */
    u32 pagesize;
    u32 rootdev;
};

#define ATAG_MEM		0x54410002
struct tag_mem32 {
    u32	size;
    u32	start;
};

#define ATAG_VIDEOTEXT	0x54410003
struct tag_videotext {
    u8	 x;
    u8	 y;
    u16	 video_page;
    u8	 video_mode;
    u8	 video_cols;
    u16	 video_ega_bx;
    u8	 video_lines;
    u8	 video_isvga;
    u16	 video_points;
};

#define ATAG_RAMDISK	0x54410004
struct tag_ramdisk {
    u32 flags;		/* b0 = load, b1 = prompt */
    u32 size;
    u32 start;
};

/*
 * this one accidentally used virtual addresses - as such,
 * its deprecated.
 */
#define ATAG_INITRD	0x54410005

/* describes where the compressed ramdisk image lives (physical address) */
#define ATAG_INITRD2	0x54420005
struct tag_initrd {
    u32 start;
    u32 size;
};

#define ATAG_SERIAL	0x54410006
struct tag_serialnr {
    u32 low;
    u32 high;
};

#define ATAG_REVISION	0x54410007
struct tag_revision {
    u32 rev;
};

#define ATAG_VIDEOLFB	0x54410008
struct tag_videolfb {
    u16	lfb_width;
    u16	lfb_height;
    u16	lfb_depth;
    u16	lfb_linelength;
    u32	lfb_base;
    u32	lfb_size;
    u8	red_size;
    u8	red_pos;
    u8	green_size;
    u8	green_pos;
    u8	blue_size;
    u8	blue_pos;
    u8	rsvd_size;
    u8	rsvd_pos;
};

#define ATAG_CMDLINE	0x54410009
struct tag_cmdline {
    char cmdline[1];
};

#define ATAG_ACORN	0x41000101
struct tag_acorn {
    u32 memc_control_reg;
    u32 vram_pages;
    u8 sounddefault;
    u8 adfsdrives;
};

#define ATAG_MEMCLK	0x41000402
struct tag_memclk {
    u32 fmemclk;
};

struct tag {
    struct tag_header hdr;
    union {
        struct tag_core		core;
        struct tag_mem32	mem;
        struct tag_videotext	videotext;
        struct tag_ramdisk	ramdisk;
        struct tag_initrd	initrd;
        struct tag_serialnr	serialnr;
        struct tag_revision	revision;
        struct tag_videolfb	videolfb;