133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/*
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* libtilemcore - Graphing calculator emulation library
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*
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* Copyright (C) 2001 Solignac Julien
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* Copyright (C) 2004-2011 Benjamin Moody
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <tilem.h>
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#include "x7.h"
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void x7_z80_wrmem(TilemCalc* calc, dword A, byte v)
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{
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unsigned long pa;
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pa = (A & 0x3FFF) + 0x4000*calc->mempagemap[(A)>>14];
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if (pa<0x80000)
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tilem_flash_write_byte(calc, pa, v);
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else if (pa < 0x88000)
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*(calc->mem+pa) = v;
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}
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static inline byte readbyte(TilemCalc* calc, dword pa)
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{
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static const byte protectbytes[6] = {0x00,0x00,0xed,0x56,0xf3,0xd3};
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int state = calc->hwregs[PROTECTSTATE];
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byte value;
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if (pa < 0x80000 && (calc->flash.state || calc->flash.busy))
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value = tilem_flash_read_byte(calc, pa);
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else
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value = *(calc->mem + pa);
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if (pa < 0x70000 || pa >= 0x80000)
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calc->hwregs[PROTECTSTATE] = 0;
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else if (state == 6)
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calc->hwregs[PROTECTSTATE] = 7;
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else if (state < 6 && value == protectbytes[state])
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calc->hwregs[PROTECTSTATE] = state + 1;
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else
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calc->hwregs[PROTECTSTATE] = 0;
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return (value);
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}
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byte x7_z80_rdmem(TilemCalc* calc, dword A)
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{
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byte page;
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unsigned long pa;
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byte value;
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page = calc->mempagemap[A>>14];
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pa = 0x4000 * page + (A & 0x3FFF);
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if (TILEM_UNLIKELY(page == 0x1E && !calc->flash.unlock)) {
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tilem_warning(calc, "Reading from read-protected sector");
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return (0xff);
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}
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value = readbyte(calc, pa);
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return(value);
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}
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byte x7_z80_rdmem_m1(TilemCalc* calc, dword A)
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{
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byte page;
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unsigned long pa;
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byte value;
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page = calc->mempagemap[A>>14];
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pa = 0x4000 * page + (A & 0x3FFF);
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if (TILEM_UNLIKELY(calc->hwregs[NOEXEC] & (1 << (page % 4)))) {
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tilem_warning(calc, "Executing in restricted Flash area");
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tilem_z80_exception(calc, TILEM_EXC_FLASH_EXEC);
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}
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if (TILEM_UNLIKELY(page == 0x1E && !calc->flash.unlock)) {
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tilem_warning(calc, "Reading from read-protected sector");
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tilem_z80_exception(calc, TILEM_EXC_RAM_EXEC);
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}
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value = readbyte(calc, pa);
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if (TILEM_UNLIKELY(value == 0xff && A == 0x0038)) {
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tilem_warning(calc, "No OS installed");
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tilem_z80_exception(calc, TILEM_EXC_FLASH_EXEC);
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}
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return (value);
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}
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dword x7_mem_ltop(TilemCalc* calc, dword A)
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{
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byte page = calc->mempagemap[A >> 14];
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return ((page << 14) | (A & 0x3fff));
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}
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dword x7_mem_ptol(TilemCalc* calc, dword A)
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{
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byte page = A >> 14;
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int i;
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for (i = 0; i < 4; i++) {
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if (calc->mempagemap[i] == page) {
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return ((i << 14) | (A & 0x3fff));
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}
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}
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return (0xffffffff);
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}
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