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skrzyp |
//==========================================================================
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//
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// var_misc.c
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//
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// HAL implementation miscellaneous functions
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): pfine
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// Contributors: jskov
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// Date: 2001-12-12
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// Purpose: HAL miscellaneous functions
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// Description: This file contains miscellaneous functions provided by the
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// HAL.
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include <pkgconf/hal.h>
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#define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS
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#include <cyg/hal/ppc_regs.h>
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#include <cyg/infra/cyg_type.h>
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#include <cyg/hal/hal_mem.h>
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//--------------------------------------------------------------------------
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void hal_variant_init(void)
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{
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}
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//--------------------------------------------------------------------------
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// Variant specific idle thread action.
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bool
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hal_variant_idle_thread_action( cyg_uint32 count )
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{
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// Let architecture idle thread action run
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return true;
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}
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//---------------------------------------------------------------------------
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// Use MMU resources to map memory regions.
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// Takes and returns an int used to ID the MMU resource to use. This ID
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// is increased as resources are used and should be used for subsequent
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// invocations.
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int
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cyg_hal_map_memory (int id,CYG_ADDRESS virt, CYG_ADDRESS phys,
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cyg_int32 size, cyg_uint8 flags)
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{
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// Use BATs to map the memory.
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cyg_uint32 ubat, lbat;
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ubat = (virt & UBAT_BEPIMASK) | UBAT_VS | UBAT_VP;
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lbat = (phys & LBAT_BRPNMASK);
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if (flags & CYGARC_MEMDESC_CI)
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lbat |= LBAT_I;
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if (flags & CYGARC_MEMDESC_GUARDED)
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lbat |= LBAT_G;
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#define IWASPATRICK
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#ifdef IWASPATRICK
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lbat |= LBAT_PP_RW; // Always enable for Read-Write
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#else
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if (flags & CYGARC_MEMDESC_RO) // Memory is Read Only
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lbat |= LBAT_PP_RO;
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if (flags & CYGARC_MEMDESC_RW) // Memory is RW
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lbat |= LBAT_PP_RW;
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#endif
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// There are 4 BATs, size is programmable.
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while (id < 4 && size > 0) {
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cyg_uint32 blk_size = 128*1024;
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cyg_uint32 bl = 0;
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while (blk_size < 256*1024*1024 && blk_size < size) {
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blk_size *= 2;
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bl = (bl << 1) | 1;
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}
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ubat = (ubat & ~UBAT_BLMASK) | (bl << 2);
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switch (id) {
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case 0:
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CYGARC_MTSPR (IBAT0U, ubat);
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CYGARC_MTSPR (IBAT0L, lbat);
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CYGARC_MTSPR (DBAT0U, ubat);
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CYGARC_MTSPR (DBAT0L, lbat);
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break;
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case 1:
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CYGARC_MTSPR (IBAT1U, ubat);
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CYGARC_MTSPR (IBAT1L, lbat);
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CYGARC_MTSPR (DBAT1U, ubat);
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CYGARC_MTSPR (DBAT1L, lbat);
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break;
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case 2:
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CYGARC_MTSPR (IBAT2U, ubat);
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CYGARC_MTSPR (IBAT2L, lbat);
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CYGARC_MTSPR (DBAT2U, ubat);
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CYGARC_MTSPR (DBAT2L, lbat);
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break;
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case 3:
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CYGARC_MTSPR (IBAT3U, ubat);
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CYGARC_MTSPR (IBAT3L, lbat);
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CYGARC_MTSPR (DBAT3U, ubat);
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CYGARC_MTSPR (DBAT3L, lbat);
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break;
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}
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size -= blk_size;
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id++;
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}
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return id;
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}
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// Initialize MMU to a sane (NOP) state.
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void
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cyg_hal_clear_MMU (void)
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{
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cyg_uint32 ubat, lbat;
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// Initialize BATs with 0 -- VS&VP are unset, making all matches fail
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ubat = 0;
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lbat = 0;
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CYGARC_MTSPR (IBAT0U, ubat);
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CYGARC_MTSPR (IBAT0L, lbat);
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CYGARC_MTSPR (DBAT0U, ubat);
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CYGARC_MTSPR (DBAT0L, lbat);
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CYGARC_MTSPR (IBAT1U, ubat);
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CYGARC_MTSPR (IBAT1L, lbat);
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CYGARC_MTSPR (DBAT1U, ubat);
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CYGARC_MTSPR (DBAT1L, lbat);
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CYGARC_MTSPR (IBAT2U, ubat);
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CYGARC_MTSPR (IBAT2L, lbat);
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CYGARC_MTSPR (DBAT2U, ubat);
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CYGARC_MTSPR (DBAT2L, lbat);
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CYGARC_MTSPR (IBAT3U, ubat);
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CYGARC_MTSPR (IBAT3L, lbat);
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CYGARC_MTSPR (DBAT3U, ubat);
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CYGARC_MTSPR (DBAT3L, lbat);
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}
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//--------------------------------------------------------------------------
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// End of var_misc.c
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