hal_diag.c

移植到WLIT项目的redboot源代码

/*=============================================================================
//
//      hal_diag.c
//
//      HAL diagnostic output code
//
//=============================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    hmt
// Contributors: hmt
// Date:         2000-02-14
// Purpose:      HAL diagnostic output
// Description:  Implementations of HAL diagnostic output support.
//
//####DESCRIPTIONEND####
//
//===========================================================================*/

#include <pkgconf/hal.h>
#include <pkgconf/system.h>
#include CYGBLD_HAL_PLATFORM_H

#include <cyg/infra/cyg_type.h>         // base types
#include <cyg/infra/cyg_trac.h>         // tracing macros
#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/hal_arch.h>           // basic machine info
#include <cyg/hal/hal_intr.h>           // interrupt macros
#include <cyg/hal/hal_io.h>             // IO macros
#include <cyg/hal/hal_diag.h>

void hal_diag_init(void)
{
    // All done
}

// these are misnamed, of course, but fit in with the usual structure of
// eCos diag channel packages:
static bool hal_diag_read_serial(char *c)
{
    char cc;
    asm volatile (
        "mov    r0, #0x06;" /* SYS_READC */
        ".word 0xE7DEAD1A;"  /* magic op to "do" SWI emulation in CoySim */
        /* "swi    0x123456;" */
        "nop;"
        "mov    %0, r0;"    /* char returned in r0, move to output reg */
        : "=r"(cc)
        :
        : "r0"
        );
    *c = cc;
    return true;
}

static void hal_diag_write_char_serial(char c)
{
    asm volatile (
        "mov    r0, #0x03;" /* SYS_WRITEC */
        "mov    r1, %0;"    /* address of char */
        ".word 0xE7DEAD1A;"  /* magic op to "do" SWI emulation in CoySim */
        /* "swi    0x123456;" */
        "nop;"
        :
        : "r"(&c)
        : "r0","r1"
        );
}

// ------------------------------------------------------------------------

void hal_diag_read_char(char *c)
{
    while (!hal_diag_read_serial(c)) ;
}

void 
hal_diag_write_char(char c)
{
    static char line[100];
    static int pos = 0;

    // No need to send CRs
    if( c == '\r' ) return;

    line[pos++] = c;

    if( c == '\n' || pos == sizeof(line) )
    {
        CYG_INTERRUPT_STATE old;
        int i;

        // Disable interrupts. This ensures a whole diagnostic line escapes
        // thus giving more useful information:
        HAL_DISABLE_INTERRUPTS(old);

        for( i = 0; i < pos; i++ ) {
            char ch = line[i];
            hal_diag_write_char_serial(ch);
        }
        pos = 0;
        
        // And re-enable interrupts
        HAL_RESTORE_INTERRUPTS(old);
    }
}

/*---------------------------------------------------------------------------*/
/* End of hal_diag.c */