hal_i386.cdl

eCos操作系统源码

# ====================================================================
#
#      hal_i386.cdl
#
#      i386 architectural HAL package 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:  jskov
# Contributors:
# Date:           1999-11-01
#
#####DESCRIPTIONEND####
#
# ====================================================================

cdl_package CYGPKG_HAL_I386 {
    display       "i386 architecture"
    parent        CYGPKG_HAL
    hardware
    include_dir   cyg/hal
    define_header hal_i386.h
    description   "
        The i386 architecture HAL package provides generic
        support for this processor architecture. It is also
        necessary to select a specific target platform HAL
        package."

    compile       hal_misc.c context.S i386_stub.c hal_syscall.c

    make {
        <PREFIX>/lib/vectors.o : <PACKAGE>/src/vectors.S
        $(CC) -Wp,-MD,vectors.tmp $(INCLUDE_PATH) $(CFLAGS) -c -o $@ $<
        @echo $@ ": \\" > $(notdir $@).deps
        @tail -n +2 vectors.tmp >> $(notdir $@).deps
        @echo >> $(notdir $@).deps
        @rm vectors.tmp
    }

    make {
        <PREFIX>/lib/target.ld: <PACKAGE>/src/i386.ld
        $(CC) -E -P -Wp,-MD,target.tmp -DEXTRAS=1 -xc $(INCLUDE_PATH) $(CFLAGS) -o $@ $<
        @echo $@ ": \\" > $(notdir $@).deps
        @tail -n +2 target.tmp >> $(notdir $@).deps
        @echo >> $(notdir $@).deps
        @rm target.tmp
    }

    cdl_component CYGPKG_HAL_SMP_SUPPORT {
	display       "SMP support"
	default_value 0
	requires { CYGHWR_HAL_I386_FPU_SWITCH_LAZY == 0 }
	
	cdl_option CYGPKG_HAL_SMP_CPU_MAX {
	    display       "Max number of CPUs supported"
	    flavor        data
	    default_value 2
	}
    }
        
    cdl_component CYGHWR_HAL_I386_FPU {
	display       "Enable I386 FPU support"
	default_value 1
	description   "This component enables support for the
	              I386 floating point unit."

	cdl_option CYGHWR_HAL_I386_FPU_SWITCH_LAZY {
	    display       "Use lazy FPU state switching"
	    flavor        bool
	    default_value 1

	    description "
	                This option enables lazy FPU state switching.
                        The default behaviour for eCos is to save and
                        restore FPU state on every thread switch, interrupt
	                and exception. While simple and deterministic, this
	                approach can be expensive if the FPU is not used by
	                all threads. The alternative, enabled by this option,
	                is to use hardware features that allow the FPU state
	                of a thread to be left in the FPU after it has been
	                descheduled, and to allow the state to be switched to
	                a new thread only if it actually uses the FPU. Where
	                only one or two threads use the FPU this can avoid a
	                lot of unnecessary state switching."
	}
    }
    
    cdl_component CYGHWR_HAL_I386_PENTIUM {
	display       "Enable Pentium class CPU features"
	default_value 0
	description   "This component enables support for various
	              features of Pentium class CPUs."

	cdl_option CYGHWR_HAL_I386_PENTIUM_SSE {
	    display       "Save/Restore SSE registers on context switch"
	    flavor        bool
	    default_value 0

	    description "
	                This option enables SSE state switching. The default
                        behaviour for eCos is to ignore the SSE registers.
                        Enabling this option adds SSE state information to
                        every thread context."
	}

	cdl_option CYGHWR_HAL_I386_PENTIUM_GDB_REGS {
	    display       "Support extra Pentium registers in GDB stub"
	    flavor        bool
	    default_value 0

	    description "
	                This option enables support for extra Pentium registers
			in the GDB stub. These are registers such as CR0-CR4, and
                        all MSRs. Not all GDBs support these registers, so the
                        default behaviour for eCos is to not include them in the
			GDB stub support code."
	}
    }
    
    cdl_option CYGBLD_LINKER_SCRIPT {
        display "Linker script"
        flavor data
	no_define
        calculated  { "src/i386.ld" }
    }

    cdl_interface CYGINT_HAL_I386_MEM_REAL_REGION_TOP {
        display  "Implementations of hal_i386_mem_real_region_top()"
    }
    
}