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# ====================================================================

#

#      hal_i386.cdl

#

#      i386 architectural HAL package configuration data

#

# ====================================================================

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## -------------------------------------------

## This file is part of eCos, the Embedded Configurable Operating System.

## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

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# ====================================================================

######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."

    implements    CYGINT_PROFILE_HAL_MCOUNT

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

    make {

        /lib/vectors.o : /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 {

        /lib/target.ld: /src/i386.ld

        $(CC) -E -P -Wp,-MD,target.tmp -DEXTRAS=1 -xc $(INCLUDE_PATH) $(ACTUAL_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()"

    }

    cdl_component CYGPKG_REDBOOT_I386_LINUX_EXEC {

        display        "Provide the exec command in RedBoot"

        flavor         none

        active_if      CYGBLD_BUILD_REDBOOT_WITH_EXEC

        description    "

            This option contains requirements for booting linux

            from RedBoot. The component is enabled/disabled from

            RedBoots CDL."

        compile -library=libextras.a redboot_linux_exec.c

        cdl_option CYGHWR_REDBOOT_I386_TRAMPOLINE_ADDRESS {

            display       "Address for the trampoline code"

            flavor        data

            default_value 0x7C000

            description   "This is the address to where the trampoline code is

                           copied.  The trampoline copies the image to its

                           final location and jumps to its entry point."

        }

    }

}