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/****************************************************************************
* arch/z80/src/z180/z180_mmu.h
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
#ifndef __ARCH_Z80_SRC_Z180_Z180_MMU_H
#define __ARCH_Z80_SRC_Z180_Z180_MMU_H
/* See arch/z80/src/z180/z180_mmu.txt for additional information */
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include "z180_iomap.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Virtual addresses */
#ifndef CONFIG_Z180_BANKAREA_VIRTBASE
# warning "Assuming Bank Area at virtual address 0x8000"
# define CONFIG_Z180_BANKAREA_VIRTBASE 0x8000
#endif
#ifndef CONFIG_Z180_COMMON1AREA_VIRTBASE
# warning "Assuming Common Area 1 at virtual address 0xc000"
# define CONFIG_Z180_COMMON1AREA_VIRTBASE 0xc000
#endif
#if CONFIG_Z180_BANKAREA_VIRTBASE > CONFIG_Z180_COMMON1AREA_VIRTBASE
# error "CONFIG_Z180_BANKAREA_VIRTBASE > CONFIG_Z180_COMMON1AREA_VIRTBASE"
#endif
/* Physical addresses */
#ifndef CONFIG_Z180_BANKAREA_PHYSBASE
# warning "Assuming Bank Area 1 at physical address 0x080000"
# define CONFIG_Z180_BANKAREA_PHYSBASE 0x08000
#endif
#ifndef CONFIG_Z180_PHYSHEAP_START
# warning "Assuming physical heap starts at physical address 0x0c000"
# define CONFIG_Z180_PHYSHEAP_START 0x0c000
#endif
#ifndef CONFIG_Z180_PHYSHEAP_END
# warning "Assuming physical heap ends at physical address 0x100000"
# define CONFIG_Z180_PHYSHEAP_END 0x100000
#endif
#if CONFIG_Z180_BANKAREA_PHYSBASE > CONFIG_Z180_PHYSHEAP_START
# error "CONFIG_Z180_BANKAREA_PHYSBASE > CONFIG_Z180_PHYSHEAP_START"
#endif
#if CONFIG_Z180_PHYSHEAP_START > CONFIG_Z180_PHYSHEAP_END
# error "CONFIG_Z180_PHYSHEAP_START > CONFIG_Z180_PHYSHEAP_END"
#endif
/* Each page is 4KB */
#define Z180_PAGESHIFT (12)
#define Z180_PAGESIZE (1 << Z180_PAGESHIFT)
#define Z180_PAGEMASK (Z180_PAGESIZE - 1)
#define PHYS_ALIGN(phys) ((phys) >> Z180_PAGESHIFT)
#define PHYS_ALIGNUP(phys) (((phys) + Z180_PAGEMASK) >> Z180_PAGESHIFT)
/* Physical pages */
#define Z180_BANKAREA_PHYSPAGE PHYS_ALIGN(CONFIG_Z180_BANKAREA_PHYSBASE)
#define Z180_PHYSHEAP_STARTPAGE PHYS_ALIGN(CONFIG_Z180_PHYSHEAP_START)
#define Z180_PHYSHEAP_ENDPAGE PHYS_ALIGN(CONFIG_Z180_PHYSHEAP_END)
#define Z180_PHYSHEAP_NPAGES (Z180_PHYSHEAP_ENDPAGE - Z180_PHYSHEAP_STARTPAGE + 1)
/* MMU register values */
#define Z180_CBAR_BA_VALUE (((CONFIG_Z180_BANKAREA_VIRTBASE >> 12) & 0x0f) << CBAR_BA_SHIFT)
#define Z180_CBAR_CA_VALUE (((CONFIG_Z180_COMMON1AREA_VIRTBASE >> 12) & 0x0f) << CBAR_CA_SHIFT)
#define Z180_CBAR_VALUE (Z180_CBAR_BA_VALUE | Z180_CBAR_CA_VALUE)
#define Z180_BBR_VALUE ((CONFIG_Z180_BANKAREA_PHYSBASE >> 12) & 0xff)
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: z180_mmu_lowinit
*
* Description:
* Low-level, power-up initialization of the z180 MMU. this must be
* called very early in the boot process to get the basic operating
* memory configuration correct. This function does *not* perform all
* necessray MMU initialization... only the basics needed at power-up.
* up_mmuinit() must be called later to complete the entire MMU
* initialization.
*
****************************************************************************/
void z180_mmu_lowinit(void) __naked;
/****************************************************************************
* Name: up_mmuinit
*
* Description:
* Perform higher level initialization of the MMU and physical memory
* memory management logic. More correctly prototypes in up_internal.h.
*
****************************************************************************/
int up_mmuinit(void);
#endif /* __ARCH_Z80_SRC_Z180_Z180_MMU_H */
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