mirror of
https://github.com/joncampbell123/dosbox-x.git
synced 2025-05-09 20:01:19 +08:00
a0cf85e536
Cygwin does not implement endian.h features for MinGW targets, but defines both of the __CYGWIN__ and __MINGW32__ identifiers and some MSVC idioms.
378 lines
10 KiB
C
378 lines
10 KiB
C
/*
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* Copyright (C) 2002-2015 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef DOSBOX_MEM_H
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#define DOSBOX_MEM_H
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#ifndef DOSBOX_DOSBOX_H
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#include "dosbox.h"
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#endif
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/* MinGW implements some MSVC idioms, so always test for MinGW first. */
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#if defined(__MINGW32__)
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# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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# define htobe16(x) htons(x)
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# define htole16(x) (x)
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# define be16toh(x) ntohs(x)
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# define le16toh(x) (x)
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# define htobe32(x) htonl(x)
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# define htole32(x) (x)
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# define be32toh(x) ntohl(x)
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# define le32toh(x) (x)
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# define htobe64(x) htonll(x)
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# define htole64(x) (x)
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# define be64toh(x) ntohll(x)
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# define le64toh(x) (x)
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# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define htobe16(x) (x)
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# define htole16(x) __builtin_bswap16(x)
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# define be16toh(x) (x)
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# define le16toh(x) __builtin_bswap16(x)
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# define htobe32(x) (x)
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# define htole32(x) __builtin_bswap32(x)
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# define be32toh(x) (x)
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# define le32toh(x) __builtin_bswap32(x)
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# define htobe64(x) (x)
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# define htole64(x) __builtin_bswap64(x)
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# define be64toh(x) (x)
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# define le64toh(x) __builtin_bswap64(x)
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# else
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# error Unexpected __BYTE_ORDER__
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# endif /* __MINGW__ __BYTE_ORDER__ */
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#elif defined(_MSC_VER)
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# if BYTE_ORDER == LITTLE_ENDIAN
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# define htobe16(x) htons(x)
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# define htole16(x) (x)
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# define be16toh(x) ntohs(x)
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# define le16toh(x) (x)
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# define htobe32(x) htonl(x)
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# define htole32(x) (x)
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# define be32toh(x) ntohl(x)
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# define le32toh(x) (x)
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# define htobe64(x) htonll(x)
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# define htole64(x) (x)
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# define be64toh(x) ntohll(x)
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# define le64toh(x) (x)
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# elif BYTE_ORDER == BIG_ENDIAN
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# define htobe16(x) (x)
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# define htole16(x) __builtin_bswap16(x)
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# define be16toh(x) (x)
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# define le16toh(x) __builtin_bswap16(x)
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# define htobe32(x) (x)
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# define htole32(x) __builtin_bswap32(x)
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# define be32toh(x) (x)
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# define le32toh(x) __builtin_bswap32(x)
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# define htobe64(x) (x)
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# define htole64(x) __builtin_bswap64(x)
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# define be64toh(x) (x)
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# define le64toh(x) __builtin_bswap64(x)
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# else
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# error Unexpected BYTE_ORDER.
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# endif /* _MSC_VER BYTE_ORDER */
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#elif defined(__APPLE__)
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/* This is a simple compatibility shim to convert
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* BSD/Linux endian macros to the Mac OS X equivalents. */
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#include <libkern/OSByteOrder.h>
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#define htobe16(x) OSSwapHostToBigInt16(x)
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#define htole16(x) OSSwapHostToLittleInt16(x)
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#define be16toh(x) OSSwapBigToHostInt16(x)
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#define le16toh(x) OSSwapLittleToHostInt16(x)
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#define htobe32(x) OSSwapHostToBigInt32(x)
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#define htole32(x) OSSwapHostToLittleInt32(x)
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#define be32toh(x) OSSwapBigToHostInt32(x)
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#define le32toh(x) OSSwapLittleToHostInt32(x)
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#define htobe64(x) OSSwapHostToBigInt64(x)
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#define htole64(x) OSSwapHostToLittleInt64(x)
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#define be64toh(x) OSSwapBigToHostInt64(x)
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#define le64toh(x) OSSwapLittleToHostInt64(x)
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#elif defined(__linux__) || defined(__CYGWIN__)
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#include <endian.h>
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#elif defined(__OpenBSD__)
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#include <sys/endian.h>
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#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
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#include <sys/endian.h>
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#define be16toh(x) betoh16(x)
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#define le16toh(x) letoh16(x)
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#define be32toh(x) betoh32(x)
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#define le32toh(x) letoh32(x)
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#define be64toh(x) betoh64(x)
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#define le64toh(x) letoh64(x)
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#endif
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typedef Bit8u *HostPt; /* host (virtual) memory address aka ptr */
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typedef Bit32u PhysPt; /* guest physical memory pointer */
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typedef Bit32u LinearPt; /* guest linear memory address */
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typedef Bit32u RealPt; /* guest real-mode memory address (16:16 -> seg:offset) */
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typedef Bit16u SegmentVal; /* guest segment value */
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typedef Bit32s MemHandle;
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#define MEM_PAGESIZE 4096
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extern HostPt MemBase;
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HostPt GetMemBase(void);
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bool MEM_A20_Enabled(void);
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void MEM_A20_Enable(bool enable);
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/* Memory management / EMS mapping */
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HostPt MEM_GetBlockPage(void);
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Bitu MEM_FreeTotal(void); //Free 4 kb pages
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Bitu MEM_FreeLargest(void); //Largest free 4 kb pages block
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Bitu MEM_TotalPages(void); //Total amount of 4 kb pages
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Bitu MEM_AllocatedPages(MemHandle handle); // amount of allocated pages of handle
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MemHandle MEM_AllocatePages(Bitu pages,bool sequence);
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MemHandle MEM_AllocatePages_A20_friendly(Bitu pages,bool sequence);
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MemHandle MEM_GetNextFreePage(void);
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PhysPt MEM_AllocatePage(void);
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void MEM_ReleasePages(MemHandle handle);
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bool MEM_ReAllocatePages(MemHandle & handle,Bitu pages,bool sequence);
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MemHandle MEM_NextHandle(MemHandle handle);
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MemHandle MEM_NextHandleAt(MemHandle handle,Bitu where);
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/*
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The folowing six functions are used everywhere in the end so these should be changed for
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Working on big or little endian machines
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*/
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#if !defined(C_UNALIGNED_MEMORY)
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/* meaning: we're probably being compiled for a processor that doesn't like unaligned WORD access,
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on such processors typecasting memory as uint16_t and higher can cause a fault if the
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address is not aligned to that datatype when we read/write through it. */
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static INLINE Bit8u host_readb(HostPt off) {
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return *off;
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}
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static INLINE Bit16u host_readw(HostPt off) {
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return (Bit16u)host_readb(off) + ((Bit16u)host_readb(off+1) << (Bit16u)8);
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}
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static INLINE Bit32u host_readd(HostPt off) {
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return (Bit32u)host_readw(off) + ((Bit32u)host_readw(off+2) << (Bit32u)16);
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}
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static INLINE Bit64u host_readq(HostPt off) {
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return (Bit64u)host_readd(off) + ((Bit64u)host_readd(off+4) << (Bit64u)32);
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}
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static INLINE void host_writeb(HostPt off,Bit8u val) {
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*off = val;
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}
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static INLINE void host_writew(HostPt off,Bit16u val) {
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host_writeb(off,(Bit8u)(val));
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host_writeb(off+1,(Bit8u)(val >> (Bit16u)8));
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}
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static INLINE void host_writed(HostPt off,Bit32u val) {
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host_writew(off,(Bit16u)(val));
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host_writew(off+2,(Bit16u)(val >> (Bit32u)16));
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}
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static INLINE void host_writeq(HostPt off,Bit64u val) {
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host_writed(off,(Bit32u)(val));
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host_writed(off+4,(Bit32u)(val >> (Bit64u)32));
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}
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#else
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static INLINE Bit8u host_readb(HostPt off) {
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return *(Bit8u *)off;
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}
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static INLINE Bit16u host_readw(HostPt off) {
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return le16toh((*(Bit16u *)off)); // BSD endian.h
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}
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static INLINE Bit32u host_readd(HostPt off) {
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return le32toh((*(Bit32u *)off)); // BSD endian.h
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}
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static INLINE Bit64u host_readq(HostPt off) {
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return le64toh((*(Bit64u *)off)); // BSD endian.h
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}
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static INLINE void host_writeb(HostPt off,Bit8u val) {
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*(Bit8u *)(off) = val;
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}
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static INLINE void host_writew(HostPt off,Bit16u val) {
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*(Bit16u *)(off) = htole16(val);
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}
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static INLINE void host_writed(HostPt off,Bit32u val) {
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*(Bit32u *)(off) = htole32(val);
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}
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static INLINE void host_writeq(HostPt off,Bit64u val) {
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*(Bit64u *)(off) = htole64(val);
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}
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#endif
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static INLINE void var_write(Bit8u * var, Bit8u val) {
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host_writeb((HostPt)var, val);
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}
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static INLINE void var_write(Bit16u * var, Bit16u val) {
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host_writew((HostPt)var, val);
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}
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static INLINE void var_write(Bit32u * var, Bit32u val) {
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host_writed((HostPt)var, val);
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}
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static INLINE void var_write(Bit64u * var, Bit64u val) {
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host_writeq((HostPt)var, val);
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}
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/* The Folowing six functions are slower but they recognize the paged memory system */
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Bit8u mem_readb(PhysPt pt);
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Bit16u mem_readw(PhysPt pt);
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Bit32u mem_readd(PhysPt pt);
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void mem_writeb(PhysPt pt,Bit8u val);
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void mem_writew(PhysPt pt,Bit16u val);
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void mem_writed(PhysPt pt,Bit32u val);
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void phys_writes(PhysPt addr, const char* string, Bitu length);
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static INLINE void phys_writeb(PhysPt addr,Bit8u val) {
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host_writeb(MemBase+addr,val);
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}
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static INLINE void phys_writew(PhysPt addr,Bit16u val){
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host_writew(MemBase+addr,val);
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}
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static INLINE void phys_writed(PhysPt addr,Bit32u val){
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host_writed(MemBase+addr,val);
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}
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static INLINE Bit8u phys_readb(PhysPt addr) {
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return host_readb(MemBase+addr);
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}
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static INLINE Bit16u phys_readw(PhysPt addr){
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return host_readw(MemBase+addr);
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}
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static INLINE Bit32u phys_readd(PhysPt addr){
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return host_readd(MemBase+addr);
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}
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/* These don't check for alignment, better be sure it's correct */
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void MEM_BlockWrite(PhysPt pt,void const * const data,Bitu size);
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void MEM_BlockRead(PhysPt pt,void * data,Bitu size);
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void MEM_BlockWrite32(PhysPt pt,void * data,Bitu size);
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void MEM_BlockRead32(PhysPt pt,void * data,Bitu size);
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void MEM_BlockCopy(PhysPt dest,PhysPt src,Bitu size);
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void MEM_StrCopy(PhysPt pt,char * data,Bitu size);
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void mem_memcpy(PhysPt dest,PhysPt src,Bitu size);
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Bitu mem_strlen(PhysPt pt);
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void mem_strcpy(PhysPt dest,PhysPt src);
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/* The folowing functions are all shortcuts to the above functions using physical addressing */
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static INLINE Bit8u real_readb(Bit16u seg,Bit16u off) {
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return mem_readb((seg<<4)+off);
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}
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static INLINE Bit16u real_readw(Bit16u seg,Bit16u off) {
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return mem_readw((seg<<4)+off);
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}
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static INLINE Bit32u real_readd(Bit16u seg,Bit16u off) {
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return mem_readd((seg<<4)+off);
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}
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static INLINE void real_writeb(Bit16u seg,Bit16u off,Bit8u val) {
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mem_writeb(((seg<<4)+off),val);
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}
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static INLINE void real_writew(Bit16u seg,Bit16u off,Bit16u val) {
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mem_writew(((seg<<4)+off),val);
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}
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static INLINE void real_writed(Bit16u seg,Bit16u off,Bit32u val) {
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mem_writed(((seg<<4)+off),val);
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}
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static INLINE Bit16u RealSeg(RealPt pt) {
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return (Bit16u)(pt>>16);
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}
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static INLINE Bit16u RealOff(RealPt pt) {
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return (Bit16u)(pt&0xffff);
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}
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static INLINE PhysPt Real2Phys(RealPt pt) {
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return (RealSeg(pt)<<4) +RealOff(pt);
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}
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static INLINE PhysPt PhysMake(Bit16u seg,Bit16u off) {
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return (seg<<4)+off;
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}
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static INLINE RealPt RealMake(Bit16u seg,Bit16u off) {
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return (seg<<16)+off;
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}
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static INLINE void RealSetVec(Bit8u vec,RealPt pt) {
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mem_writed(vec<<2,pt);
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}
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static INLINE void RealSetVec(Bit8u vec,RealPt pt,RealPt &old) {
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old = mem_readd(vec<<2);
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mem_writed(vec<<2,pt);
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}
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/* convert physical address to 4:16 real pointer (example: 0xABCDE -> 0xA000:0xBCDE) */
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static INLINE RealPt PhysToReal416(PhysPt phys) {
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return RealMake((phys>>4)&0xF000,phys&0xFFFF);
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}
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static INLINE RealPt RealGetVec(Bit8u vec) {
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return mem_readd(vec<<2);
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}
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#endif
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