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//==========================================================================

//

//      var_misc.c

//

//      HAL implementation miscellaneous functions

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

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

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

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

// Copyright (C) 2002 Gary Thomas

//

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// the terms of the GNU General Public License as published by the Free

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//

// 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

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//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    jskov

// Contributors: jskov

// Date:         2000-02-04

// Purpose:      HAL miscellaneous functions

// Description:  This file contains miscellaneous functions provided by the

//               HAL.

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/hal.h>

#define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS

#include <cyg/hal/ppc_regs.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/hal/hal_mem.h>

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

void hal_variant_init(void)

{

}

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

// Variant specific idle thread action.

bool

hal_variant_idle_thread_action( cyg_uint32 count )

{

    // Let architecture idle thread action run

    return true;

}

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

// Use MMU resources to map memory regions.  

// Takes and returns an int used to ID the MMU resource to use. This ID

// is increased as resources are used and should be used for subsequent

// invocations.

int

cyg_hal_map_memory (int id,CYG_ADDRESS virt, CYG_ADDRESS phys,

                    cyg_int32 size, cyg_uint8 flags)

{

    // Use BATs to map the memory.

    cyg_uint32 ubat, lbat;

    ubat = (virt & UBAT_BEPIMASK) | UBAT_VS | UBAT_VP;

    lbat = (phys & LBAT_BRPNMASK) | LBAT_PP_RW;

    if (flags & CYGARC_MEMDESC_CI)

        lbat |= LBAT_I;

    if (flags & CYGARC_MEMDESC_GUARDED)

        lbat |= LBAT_G;

    // There are 4 BATs, size is programmable.

    while (id < 4 && size > 0) {

        cyg_uint32 blk_size = 128*1024;

        cyg_uint32 bl = 0;

        while (blk_size < 256*1024*1024 && blk_size < size) {

            blk_size *= 2;

            bl = (bl << 1) | 1;

        }

        ubat = (ubat & ~UBAT_BLMASK) | (bl << 2);

        switch (id) {

        case 0:

            CYGARC_MTSPR (IBAT0U, ubat);

            CYGARC_MTSPR (IBAT0L, lbat);

            CYGARC_MTSPR (DBAT0U, ubat);

            CYGARC_MTSPR (DBAT0L, lbat);

            break;

        case 1:

            CYGARC_MTSPR (IBAT1U, ubat);

            CYGARC_MTSPR (IBAT1L, lbat);

            CYGARC_MTSPR (DBAT1U, ubat);

            CYGARC_MTSPR (DBAT1L, lbat);

            break;

        case 2:

            CYGARC_MTSPR (IBAT2U, ubat);

            CYGARC_MTSPR (IBAT2L, lbat);

            CYGARC_MTSPR (DBAT2U, ubat);

            CYGARC_MTSPR (DBAT2L, lbat);

            break;

        case 3:

            CYGARC_MTSPR (IBAT3U, ubat);

            CYGARC_MTSPR (IBAT3L, lbat);

            CYGARC_MTSPR (DBAT3U, ubat);

            CYGARC_MTSPR (DBAT3L, lbat);

            break;

        }

        size -= blk_size;

        id++;

    }

    return id;

}

// Initialize MMU to a sane (NOP) state.

void

cyg_hal_clear_MMU (void)

{

    cyg_uint32 ubat, lbat;

    // Initialize BATs with 0 -- VS&VP are unset, making all matches fail

    ubat = 0;

    lbat = 0;

    CYGARC_MTSPR (IBAT0U, ubat);

    CYGARC_MTSPR (IBAT0L, lbat);

    CYGARC_MTSPR (DBAT0U, ubat);

    CYGARC_MTSPR (DBAT0L, lbat);

    CYGARC_MTSPR (IBAT1U, ubat);

    CYGARC_MTSPR (IBAT1L, lbat);

    CYGARC_MTSPR (DBAT1U, ubat);

    CYGARC_MTSPR (DBAT1L, lbat);

    CYGARC_MTSPR (IBAT2U, ubat);

    CYGARC_MTSPR (IBAT2L, lbat);

    CYGARC_MTSPR (DBAT2U, ubat);

    CYGARC_MTSPR (DBAT2L, lbat);

    CYGARC_MTSPR (IBAT3U, ubat);

    CYGARC_MTSPR (IBAT3L, lbat);

    CYGARC_MTSPR (DBAT3U, ubat);

    CYGARC_MTSPR (DBAT3L, lbat);

}

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

// End of var_misc.c