common.cdl

eCos操作系统源码

# ====================================================================
#
#      common.cdl
#
#      HAL common configuration data
#
# ====================================================================
#####ECOSGPLCOPYRIGHTBEGIN####
## -------------------------------------------
## This file is part of eCos, the Embedded Configurable Operating System.
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
##
## 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####
# ====================================================================
######DESCRIPTIONBEGIN####
#
# Author(s):      jskov
# Original data:  nickg,jskov,jlarmour
# Contributors:
# Date:           1999-07-02
#
#####DESCRIPTIONEND####
#
# ====================================================================

cdl_option CYGFUN_HAL_COMMON_KERNEL_SUPPORT {
    display       "Provide eCos kernel support"
    requires      CYGPKG_KERNEL
    default_value CYGPKG_KERNEL
    description   "
        The HAL can be configured to either support the full eCos
        kernel, or to support only very simple applications which do
        not require a full kernel. If kernel support is not required
        then some of the startup, exception, and interrupt handling
        code can be eliminated."
}

# NOTE: The requirement for kernel exception support is bogus in that
# the user can supply a deliver_exception function herself. In that
# case, however, it is easy to force the kernel option off while leaving
# this one on.  Having the requirement prevents accidental invalid
# configurations of the kernel.
cdl_option CYGPKG_HAL_EXCEPTIONS {
    display       "HAL exception support"
    requires      CYGPKG_KERNEL_EXCEPTIONS
    default_value CYGPKG_KERNEL_EXCEPTIONS
    description   "
        When a processor exception occurs, for example an attempt to
        execute an illegal instruction or to perform a divide by
        zero, this exception may be handled in a number of different
        ways. If the target system has gdb support then typically
        the exception will be handled by gdb code. Otherwise if the
        HAL exception support is enabled then the HAL will invoke a
        routine deliver_exception(). Typically this routine will be
        provided by the eCos kernel, but it is possible for
        application code to provide its own implementation. If the
        HAL exception support is not enabled and a processor
        exception occurs then the behaviour of the system is
        undefined."
}

cdl_option CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG {
    display       "Stop calling constructors early"
    requires      CYGSEM_LIBC_INVOKE_DEFAULT_STATIC_CONSTRUCTORS
    default_value 0
    description   "
        This option supports environments where some constructors
        must be run in the context of a thread rather than at
        simple system startup time. A boolean flag named
        cyg_hal_stop_constructors is set to 1 when constructors
        should no longer be invoked. It is up to some other
        package to deal with the rest of the constructors.
        In the current version this is only possible with the
        C library."
}

cdl_interface CYGINT_HAL_SUPPORTS_MMU_TABLES {
    display   "HAL uses the MMU and allows for CDL manipulation of it's use"
}

cdl_option CYGSEM_HAL_INSTALL_MMU_TABLES {
    display        "Install MMU tables."
    default_value  { CYG_HAL_STARTUP != "RAM" }
    active_if      CYGINT_HAL_SUPPORTS_MMU_TABLES
    description    "This option controls whether this application installs
       its own Memory Management Unit (MMU) tables, or relies on the
       existing environment to run."
}

cdl_option CYGSEM_HAL_STATIC_MMU_TABLES {
    display        "Use static MMU tables."
    default_value  0
    requires       CYGSEM_HAL_INSTALL_MMU_TABLES
    description "This option defines an environment where any Memory
       Management Unit (MMU) tables are constant.  Normally used by ROM
       based environments, this provides a way to save RAM usage which
       would otherwise be required for these tables."
}

cdl_component CYGDBG_HAL_DIAG_TO_DEBUG_CHAN {
    display       "Route diagnostic output to debug channel"
    default_value { (CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS \
                     || CYG_HAL_STARTUP == "RAM") ? 1 : 0}
    active_if     !CYGSEM_HAL_VIRTUAL_VECTOR_INHERIT_CONSOLE
    active_if     { CYGPKG_HAL_ARM || CYGPKG_HAL_POWERPC_MPC8xx \
                    || CYGPKG_HAL_V85X_V850 || CYGSEM_HAL_VIRTUAL_VECTOR_DIAG }
    description   "
        If not inheriting the console setup from the ROM monitor,
        it is possible to redirect diagnostic output to the debug
        channel by enabling this option. Depending on the debugger
        used it may also be necessary to select a mangler for the
        output to be displayed by the debugger."

    cdl_option CYGSEM_HAL_DIAG_MANGLER {
        display       "Mangler used on diag output"
        flavor        data
        legal_values  {"GDB" "None"}
        default_value { "GDB" }
        description   "
            It is sometimes necessary to mangle (encode) the
            diag ASCII text output in order for it to show up at the
            other end. In particular, GDB may silently ignore raw
            ASCII text."
    }
}