var_arch.s

eCos操作系统源码

##=============================================================================
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## -------------------------------------------
## This file is part of eCos, the Embedded Configurable Operating System.
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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##=============================================================================
/*****************************************************************************
var_arch.S -- mcf52xx variant code
*****************************************************************************/

#include <pkgconf/hal.h>

/*****************************************************************************
FUNC_START -- Function declaration macro
*****************************************************************************/
#define FUNC_START(name)                        \
        .text;                                  \
        .even;                                  \
        .globl name;                            \
name:

/* ************************************************************************ */
/* These routines write to  the special purpose  registers in the  ColdFire */
/* core.  Since these registers are write-only in the supervisor model,  no */
/* corresponding read routines exist.                                       */

FUNC_START(mcf52xx_wr_vbr)
    move.l  4(%sp),%d0
    andi.l  #0xFFF00000,%d0 /* align to 1M boundary  */
    movec   %d0,%vbr
    nop
    rts

FUNC_START(mcf52xx_wr_cacr)
    move.l  4(%sp),%d0
    movec   %d0,%cacr
    nop
    rts

FUNC_START(mcf52xx_wr_acr0)
    move.l  4(%sp),%d0
    movec   %d0,%acr0
    nop
    rts

FUNC_START(mcf52xx_wr_acr1)
    move.l  4(%sp),%d0
    movec   %d0,%acr1
    nop
    rts

FUNC_START(mcf52xx_wr_rambar)
    move.l  4(%sp),%d0
    .equ    rambar,0xc04    /* Rc for movec */
    movec   %d0,#rambar
    nop
    rts