mirror of
https://github.com/joncampbell123/dosbox-x.git
synced 2025-05-08 19:32:39 +08:00
286 lines
10 KiB
C
286 lines
10 KiB
C
/*
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* Copyright (C) 2002-2021 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 along
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* with this program; 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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#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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#include "byteorder.h"
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#define MEM_PAGESIZE (4096U)
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typedef uint8_t const * ConstHostPt; /* host (virtual) memory address aka ptr */
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typedef uint8_t * HostPt; /* host (virtual) memory address aka ptr */
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typedef uint32_t PhysPt; /* guest physical memory pointer */
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typedef uint32_t LinearPt; /* guest linear memory address */
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typedef uint32_t RealPt; /* guest real-mode memory address (16:16 -> seg:offset) */
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typedef uint16_t SegmentVal; /* guest segment value */
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typedef int32_t MemHandle;
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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 enabled);
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/* Memory management / EMS mapping */
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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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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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static INLINE uint8_t host_readb(ConstHostPt const off) {
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return *off;
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}
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static INLINE void host_writeb(HostPt const off,const uint8_t val) {
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*off = val;
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}
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// use __builtin_bswap* for gcc >= 4.3
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#if defined(WORDS_BIGENDIAN) && defined(__GNUC__) && \
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(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
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static INLINE uint16_t host_readw(ConstHostPt off) {
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return __builtin_bswap16(*(uint16_t *)off);
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}
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static INLINE uint32_t host_readd(ConstHostPt off) {
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return __builtin_bswap32(*(uint32_t *)off);
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}
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static INLINE void host_writew(HostPt off, const uint16_t val) {
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*(uint16_t *)off = __builtin_bswap16(val);
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}
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static INLINE void host_writed(HostPt off, const uint32_t val) {
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*(uint32_t *)off = __builtin_bswap32(val);
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}
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#elif defined(WORDS_BIGENDIAN) || !defined(C_UNALIGNED_MEMORY)
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/* !defined(C_UNALIGNED_MEMORY) 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 uint16_t host_readw(ConstHostPt const off) {
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return (uint16_t)host_readb(off) + ((uint16_t)host_readb(off+(uintptr_t)1U) << (uint16_t)8U);
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}
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static INLINE uint32_t host_readd(ConstHostPt const off) {
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return (uint32_t)host_readw(off) + ((uint32_t)host_readw(off+(uintptr_t)2U) << (uint32_t)16U);
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}
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static INLINE uint64_t host_readq(ConstHostPt const off) {
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return (uint64_t)host_readd(off) + ((uint64_t)host_readd(off+(uintptr_t)4U) << (uint64_t)32U);
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}
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static INLINE void host_writew(HostPt const off,const uint16_t val) {
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host_writeb(off, (uint8_t)(val));
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host_writeb(off+1U,(uint8_t)(val >> (uint16_t)8U));
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}
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static INLINE void host_writed(HostPt const off,const uint32_t val) {
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host_writew(off, (uint16_t)(val));
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host_writew(off+2U,(uint16_t)(val >> (uint32_t)16U));
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}
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static INLINE void host_writeq(HostPt const off,const uint64_t val) {
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host_writed(off, (uint32_t)(val));
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host_writed(off+4U,(uint32_t)(val >> (uint64_t)32U));
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}
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#else
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static INLINE uint16_t host_readw(ConstHostPt const off) {
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return le16toh((*(const uint16_t *)off)); // BSD endian.h
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}
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static INLINE uint32_t host_readd(ConstHostPt const off) {
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return le32toh((*(const uint32_t *)off)); // BSD endian.h
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}
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static INLINE uint64_t host_readq(ConstHostPt const off) {
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return le64toh((*(const uint64_t *)off)); // BSD endian.h
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}
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static INLINE void host_writew(HostPt const off,const uint16_t val) {
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*(uint16_t *)(off) = htole16(val);
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}
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static INLINE void host_writed(HostPt const off,const uint32_t val) {
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*(uint32_t *)(off) = htole32(val);
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}
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static INLINE void host_writeq(HostPt const off,const uint64_t val) {
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*(uint64_t *)(off) = htole64(val);
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}
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#endif
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static INLINE void var_write(uint8_t * const var, const uint8_t val) {
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host_writeb((HostPt)var, val);
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}
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static INLINE void var_write(uint16_t * const var, const uint16_t val) {
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host_writew((HostPt)var, val);
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}
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static INLINE void var_write(uint32_t * const var, const uint32_t val) {
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host_writed((HostPt)var, val);
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}
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static INLINE void var_write(uint64_t * const var, const uint64_t val) {
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host_writeq((HostPt)var, val);
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}
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static INLINE uint16_t var_read(uint16_t * var) {
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return host_readw((ConstHostPt)var);
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}
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static INLINE uint32_t var_read(uint32_t * var) {
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return host_readd((ConstHostPt)var);
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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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uint8_t mem_readb(const PhysPt address);
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uint16_t mem_readw(const PhysPt address);
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uint32_t mem_readd(const PhysPt address);
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void mem_writeb(const PhysPt address,const uint8_t val);
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void mem_writew(const PhysPt address,const uint16_t val);
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void mem_writed(const PhysPt address,const uint32_t val);
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void phys_writes(PhysPt addr, const char* string, Bitu length);
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/* WARNING: These will cause a segfault or out of bounds access IF
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* addr is beyond the end of memory */
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static INLINE void phys_writeb(const PhysPt addr,const uint8_t val) {
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host_writeb(MemBase+addr,val);
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}
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static INLINE void phys_writew(const PhysPt addr,const uint16_t val) {
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host_writew(MemBase+addr,val);
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}
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static INLINE void phys_writed(const PhysPt addr,const uint32_t val) {
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host_writed(MemBase+addr,val);
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}
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static INLINE uint8_t phys_readb(const PhysPt addr) {
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return host_readb(MemBase+addr);
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}
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static INLINE uint16_t phys_readw(const PhysPt addr) {
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return host_readw(MemBase+addr);
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}
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static INLINE uint32_t phys_readd(const 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 constexpr PhysPt PhysMake(const uint16_t seg,const uint16_t off) {
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return ((PhysPt)seg << (PhysPt)4U) + (PhysPt)off;
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}
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static inline constexpr uint16_t RealSeg(const RealPt pt) {
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return (uint16_t)((RealPt)pt >> (RealPt)16U);
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}
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static inline constexpr uint16_t RealOff(const RealPt pt) {
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return (uint16_t)((RealPt)pt & (RealPt)0xffffu);
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}
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static inline constexpr PhysPt Real2Phys(const RealPt pt) {
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return (PhysPt)(((PhysPt)RealSeg(pt) << (PhysPt)4U) + (PhysPt)RealOff(pt));
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}
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static inline constexpr RealPt RealMake(const uint16_t seg,const uint16_t off) {
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return (RealPt)(((RealPt)seg << (RealPt)16U) + (RealPt)off);
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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 constexpr RealPt PhysToReal416(const PhysPt phys) {
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return RealMake((uint16_t)(((PhysPt)phys >> (PhysPt)4U) & (PhysPt)0xF000U),(uint16_t)((PhysPt)phys & (PhysPt)0xFFFFU));
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}
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static inline constexpr PhysPt RealVecAddress(const uint8_t vec) {
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return (PhysPt)((unsigned int)vec << 2U);
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}
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static INLINE uint8_t real_readb(const uint16_t seg,const uint16_t off) {
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return mem_readb(PhysMake(seg,off));
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}
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static INLINE uint16_t real_readw(const uint16_t seg,const uint16_t off) {
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return mem_readw(PhysMake(seg,off));
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}
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static INLINE uint32_t real_readd(const uint16_t seg,const uint16_t off) {
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return mem_readd(PhysMake(seg,off));
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}
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static INLINE void real_writeb(const uint16_t seg,const uint16_t off,const uint8_t val) {
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mem_writeb(PhysMake(seg,off),val);
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}
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static INLINE void real_writew(const uint16_t seg,const uint16_t off,const uint16_t val) {
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mem_writew(PhysMake(seg,off),val);
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}
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static INLINE void real_writed(const uint16_t seg,const uint16_t off,const uint32_t val) {
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mem_writed(PhysMake(seg,off),val);
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}
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static INLINE RealPt RealGetVec(const uint8_t vec) {
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return mem_readd(RealVecAddress(vec));
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}
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static INLINE void RealSetVec(const uint8_t vec,const RealPt pt) {
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mem_writed(RealVecAddress(vec),(uint32_t)pt);
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}
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static INLINE void RealSetVec(const uint8_t vec,const RealPt pt,RealPt &old) {
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const PhysPt addr = RealVecAddress(vec);
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old = mem_readd(addr);
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mem_writed(addr,pt);
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}
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#endif
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