FreeBSD/Linux Kernel Cross Reference
sys/arm/include/platform.h

     /*-
      * Copyright (c) 2014 Andrew Turner
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_PLATFORM_H_
    #define _MACHINE_PLATFORM_H_
    
    /*
     * Initialization functions called by the common initarm() function in
     * arm/machdep.c (but not necessarily from the custom initarm() functions of
     * older code).
     *
     *  - platform_probe_and_attach() is called very early, after parsing the boot
     *    params and after physical memory has been located and sized.
     *
     *  - platform_devmap_init() is called as one of the last steps of early virtual
     *    memory initialization, shortly before the new page tables are installed.
     *
     *  - platform_lastaddr() is called after platform_devmap_init(), and must return
     *    the address of the first byte of unusable KVA space.  This allows a
     *    platform to carve out of the top of the KVA space whatever reserves it
     *    needs for things like static device mapping, and this is called to get the
     *    value before calling pmap_bootstrap() which uses the value to size the
     *    available KVA.
     *
     *  - platform_gpio_init() is called after the static device mappings are
     *    established and just before cninit().  The intention is that the routine
     *    can do any hardware setup (such as gpio or pinmux) necessary to make the
     *    console functional.
     *
     *  - platform_late_init() is called just after cninit().  This is the first of
     *    the init routines that can use printf() and expect the output to appear on
     *    a standard console.
     *
     */
    void platform_probe_and_attach(void);
    int platform_devmap_init(void);
    vm_offset_t platform_lastaddr(void);
    void platform_gpio_init(void);
    void platform_late_init(void);
    
    #endif  /* _MACHINE_PLATFORM_H_ */

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