mirror of
https://github.com/reactos/wine.git
synced 2024-11-25 12:49:45 +00:00
winedos: Implement MCB.
This commit is contained in:
Markus Amsler
Alexandre Julliard
parent
ac459e7ea0
commit
19d60d3c5a
@ -51,38 +51,47 @@ WINE_DEFAULT_DEBUG_CHANNEL(dosmem);
|
||||
static char *DOSMEM_dosmem;
|
||||
static char *DOSMEM_sysmem;
|
||||
|
||||
/* use 2 low bits of 'size' for the housekeeping */
|
||||
#define DM_BLOCK_DEBUG 0xABE00000
|
||||
#define DM_BLOCK_TERMINAL 0x00000001
|
||||
#define DM_BLOCK_FREE 0x00000002
|
||||
#define DM_BLOCK_MASK 0x001FFFFC
|
||||
/*
|
||||
* Memory Control Block (MCB) definition
|
||||
* FIXME: implement Allocation Strategy
|
||||
*/
|
||||
|
||||
#define MCB_DUMP(mc) \
|
||||
TRACE ("MCB_DUMP base=%p type=%02xh psp=%04xh size=%04xh\n", mc, mc->type, mc->psp , mc->size )
|
||||
|
||||
#define MCB_NEXT(mc) \
|
||||
(MCB*) ((mc->type==MCB_TYPE_LAST) ? NULL : (char*)(mc) + ((mc->size + 1) << 4) )
|
||||
|
||||
/* FIXME: should we check more? */
|
||||
#define MCB_VALID(mc) \
|
||||
((mc->type==MCB_TYPE_NORMAL) || (mc->type==MCB_TYPE_LAST))
|
||||
|
||||
|
||||
#define MCB_TYPE_NORMAL 0x4d
|
||||
#define MCB_TYPE_LAST 0x5a
|
||||
|
||||
#define MCB_PSP_DOS 0x0060
|
||||
#define MCB_PSP_FREE 0
|
||||
|
||||
#include "pshpack1.h"
|
||||
typedef struct {
|
||||
BYTE type;
|
||||
WORD psp; /* segment of owner psp */
|
||||
WORD size; /* in paragraphs */
|
||||
BYTE pad[3];
|
||||
BYTE name[8];
|
||||
} MCB;
|
||||
#include "poppack.h"
|
||||
|
||||
/*
|
||||
#define __DOSMEM_DEBUG__
|
||||
*/
|
||||
|
||||
typedef struct {
|
||||
unsigned size;
|
||||
} dosmem_entry;
|
||||
|
||||
typedef struct {
|
||||
unsigned blocks;
|
||||
unsigned free;
|
||||
} dosmem_info;
|
||||
|
||||
static inline dosmem_entry* next_block(dosmem_entry* block)
|
||||
{
|
||||
return (dosmem_entry*)((char*)block +
|
||||
sizeof(dosmem_entry) + (block->size & DM_BLOCK_MASK));
|
||||
}
|
||||
|
||||
#define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
|
||||
#define VM_STUB_SEGMENT 0xf000 /* BIOS segment */
|
||||
|
||||
/* FIXME: this should be moved to the LOL, and the whole allocation strategy
|
||||
* should use real MCB
|
||||
*/
|
||||
static dosmem_info* DOSMEM_info_block;
|
||||
/* FIXME: this should be moved to the LOL */
|
||||
static MCB* DOSMEM_root_block;
|
||||
|
||||
/***********************************************************************
|
||||
* DOSMEM_MemoryTop
|
||||
@ -94,18 +103,6 @@ static char *DOSMEM_MemoryTop(void)
|
||||
return DOSMEM_dosmem+0x9FFFC; /* 640K */
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
* DOSMEM_RootBlock
|
||||
*
|
||||
* Gets the DOS memory root block.
|
||||
*/
|
||||
static dosmem_entry *DOSMEM_RootBlock(void)
|
||||
{
|
||||
/* first block has to be paragraph-aligned */
|
||||
return (dosmem_entry*)(((char*)DOSMEM_info_block) +
|
||||
((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry))));
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
* DOSMEM_FillIsrTable
|
||||
*
|
||||
@ -233,6 +230,24 @@ void BiosTick( WORD timer )
|
||||
if (pBiosData) pBiosData->Ticks++;
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
* DOSMEM_Collapse
|
||||
*
|
||||
* Helper function for internal use only.
|
||||
* Atach all following free blocks to this one, even if this one is not free.
|
||||
*/
|
||||
void DOSMEM_Collapse( MCB* mcb )
|
||||
{
|
||||
MCB* next = MCB_NEXT( mcb );
|
||||
|
||||
while (next && next->psp == MCB_PSP_FREE)
|
||||
{
|
||||
mcb->size = mcb->size + next->size + 1;
|
||||
mcb->type = next->type; /* make sure keeping MCB_TYPE_LAST */
|
||||
next = MCB_NEXT( next );
|
||||
}
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
* DOSMEM_AllocBlock
|
||||
*
|
||||
@ -240,72 +255,58 @@ void BiosTick( WORD timer )
|
||||
*/
|
||||
LPVOID DOSMEM_AllocBlock(UINT size, UINT16* pseg)
|
||||
{
|
||||
UINT blocksize;
|
||||
char *block = NULL;
|
||||
dosmem_info *info_block = DOSMEM_info_block;
|
||||
dosmem_entry *dm;
|
||||
#ifdef __DOSMEM_DEBUG_
|
||||
dosmem_entry *prev = NULL;
|
||||
#endif
|
||||
MCB *curr = DOSMEM_root_block;
|
||||
MCB *next = NULL;
|
||||
WORD psp = DOSVM_psp;
|
||||
|
||||
if (!psp)
|
||||
psp = MCB_PSP_DOS;
|
||||
|
||||
*pseg = 0;
|
||||
|
||||
TRACE( "(%04xh)\n", size );
|
||||
|
||||
/* round up to paragraph */
|
||||
size = (size + 15) >> 4;
|
||||
|
||||
if( size > info_block->free ) return NULL;
|
||||
dm = DOSMEM_RootBlock();
|
||||
|
||||
while (dm && dm->size != DM_BLOCK_TERMINAL)
|
||||
{
|
||||
#ifdef __DOSMEM_DEBUG__
|
||||
if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
|
||||
{
|
||||
WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
|
||||
return NULL;
|
||||
}
|
||||
prev = dm;
|
||||
DOSMEM_Available(); /* checks the whole MCB list */
|
||||
#endif
|
||||
if( dm->size & DM_BLOCK_FREE )
|
||||
{
|
||||
dosmem_entry *next = next_block(dm);
|
||||
|
||||
while ( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
|
||||
{
|
||||
dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
|
||||
next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
|
||||
next = next_block(dm);
|
||||
}
|
||||
|
||||
blocksize = dm->size & DM_BLOCK_MASK;
|
||||
if( blocksize >= size )
|
||||
{
|
||||
block = ((char*)dm) + sizeof(dosmem_entry);
|
||||
if( blocksize - size > 0x20 )
|
||||
{
|
||||
/* split dm so that the next one stays
|
||||
* paragraph-aligned (and dm loses free bit) */
|
||||
|
||||
dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
|
||||
sizeof(dosmem_entry));
|
||||
next = (dosmem_entry*)(((char*)dm) +
|
||||
sizeof(dosmem_entry) + dm->size);
|
||||
next->size = (blocksize - (dm->size +
|
||||
sizeof(dosmem_entry))) | DM_BLOCK_FREE
|
||||
#ifdef __DOSMEM_DEBUG__
|
||||
| DM_BLOCK_DEBUG
|
||||
#endif
|
||||
;
|
||||
} else dm->size &= DM_BLOCK_MASK;
|
||||
|
||||
info_block->blocks++;
|
||||
info_block->free -= dm->size;
|
||||
if( pseg ) *pseg = (block - DOSMEM_dosmem) >> 4;
|
||||
#ifdef __DOSMEM_DEBUG__
|
||||
dm->size |= DM_BLOCK_DEBUG;
|
||||
#endif
|
||||
break;
|
||||
}
|
||||
dm = next;
|
||||
}
|
||||
else dm = next_block(dm);
|
||||
}
|
||||
return (LPVOID)block;
|
||||
|
||||
/* loop over all MCB and search the next large enough MCB */
|
||||
while (curr)
|
||||
{
|
||||
if (!MCB_VALID (curr))
|
||||
{
|
||||
ERR( "MCB List Corrupt\n" );
|
||||
MCB_DUMP( curr );
|
||||
return NULL;
|
||||
}
|
||||
if (curr->psp == MCB_PSP_FREE)
|
||||
{
|
||||
DOSMEM_Collapse( curr );
|
||||
/* is it large enough (one paragaph for the MCB)? */
|
||||
if (curr->size >= size)
|
||||
{
|
||||
if (curr->size > size)
|
||||
{
|
||||
/* split curr */
|
||||
next = (MCB *) ((char*) curr + ((size+1) << 4));
|
||||
next->psp = MCB_PSP_FREE;
|
||||
next->size = curr->size - (size+1);
|
||||
next->type = curr->type;
|
||||
curr->type = MCB_TYPE_NORMAL;
|
||||
curr->size = size;
|
||||
}
|
||||
/* curr is the found block */
|
||||
curr->psp = psp;
|
||||
if( pseg ) *pseg = (((char*)curr) + 16 - (char*)DOSMEM_dosmem) >> 4;
|
||||
return (LPVOID) ((char*)curr + 16);
|
||||
}
|
||||
}
|
||||
curr = MCB_NEXT(curr);
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
@ -313,28 +314,24 @@ LPVOID DOSMEM_AllocBlock(UINT size, UINT16* pseg)
|
||||
*/
|
||||
BOOL DOSMEM_FreeBlock(void* ptr)
|
||||
{
|
||||
dosmem_info *info_block = DOSMEM_info_block;
|
||||
MCB* mcb = (MCB*) ((char*)ptr - 16);
|
||||
|
||||
TRACE( "(%p)\n", ptr );
|
||||
|
||||
if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) &&
|
||||
ptr < (void*)DOSMEM_MemoryTop() && !((((char*)ptr)
|
||||
- DOSMEM_dosmem) & 0xf) )
|
||||
{
|
||||
dosmem_entry *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
|
||||
|
||||
if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
|
||||
#ifdef __DOSMEM_DEBUG__
|
||||
&& ((dm->size & DM_BLOCK_DEBUG) == DM_BLOCK_DEBUG )
|
||||
DOSMEM_Available();
|
||||
#endif
|
||||
)
|
||||
{
|
||||
info_block->blocks--;
|
||||
info_block->free += dm->size;
|
||||
|
||||
dm->size |= DM_BLOCK_FREE;
|
||||
return TRUE;
|
||||
}
|
||||
}
|
||||
return FALSE;
|
||||
|
||||
if (!MCB_VALID (mcb))
|
||||
{
|
||||
ERR( "MCB invalid\n" );
|
||||
MCB_DUMP( mcb );
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
mcb->psp = MCB_PSP_FREE;
|
||||
DOSMEM_Collapse( mcb );
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
@ -345,72 +342,55 @@ BOOL DOSMEM_FreeBlock(void* ptr)
|
||||
* If exact is TRUE, returned value is either old or requested block
|
||||
* size. If exact is FALSE, block is expanded even if there is not
|
||||
* enough space for full requested block size.
|
||||
*
|
||||
* TODO: return also biggest block size
|
||||
*/
|
||||
UINT DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact)
|
||||
{
|
||||
char *block = NULL;
|
||||
dosmem_info *info_block = DOSMEM_info_block;
|
||||
dosmem_entry *dm;
|
||||
dosmem_entry *next;
|
||||
UINT blocksize;
|
||||
UINT orgsize;
|
||||
MCB* mcb = (MCB*) ((char*)ptr - 16);
|
||||
MCB* next;
|
||||
|
||||
TRACE( "(%p,%04xh,%s)\n", ptr, size, exact ? "TRUE" : "FALSE" );
|
||||
|
||||
/* round up to paragraph */
|
||||
size = (size + 15) >> 4;
|
||||
|
||||
if( (ptr < (void*)(sizeof(dosmem_entry) + (char*)DOSMEM_RootBlock())) ||
|
||||
(ptr >= (void*)DOSMEM_MemoryTop()) ||
|
||||
(((((char*)ptr) - DOSMEM_dosmem) & 0xf) != 0) )
|
||||
return (UINT)-1;
|
||||
#ifdef __DOSMEM_DEBUG__
|
||||
DOSMEM_Available();
|
||||
#endif
|
||||
|
||||
if (!MCB_VALID (mcb))
|
||||
{
|
||||
ERR( "MCB invalid\n" );
|
||||
MCB_DUMP( mcb );
|
||||
return -1;
|
||||
}
|
||||
|
||||
dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
|
||||
if( dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL) )
|
||||
return (UINT)-1;
|
||||
/* resize needed? */
|
||||
if (mcb->size == size)
|
||||
return size;
|
||||
|
||||
next = next_block(dm);
|
||||
orgsize = dm->size & DM_BLOCK_MASK;
|
||||
|
||||
/* collapse free blocks */
|
||||
while ( next->size & DM_BLOCK_FREE )
|
||||
{
|
||||
dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
|
||||
next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
|
||||
next = next_block(dm);
|
||||
}
|
||||
|
||||
blocksize = dm->size & DM_BLOCK_MASK;
|
||||
|
||||
/*
|
||||
* If collapse didn't help we either expand block to maximum
|
||||
* available size (exact == FALSE) or give collapsed blocks
|
||||
* back to free storage (exact == TRUE).
|
||||
*/
|
||||
if (blocksize < size)
|
||||
size = exact ? orgsize : blocksize;
|
||||
|
||||
block = ((char*)dm) + sizeof(dosmem_entry);
|
||||
if( blocksize - size > 0x20 )
|
||||
{
|
||||
/*
|
||||
* split dm so that the next one stays
|
||||
* paragraph-aligned (and next gains free bit)
|
||||
*/
|
||||
|
||||
dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
|
||||
sizeof(dosmem_entry));
|
||||
next = (dosmem_entry*)(((char*)dm) +
|
||||
sizeof(dosmem_entry) + dm->size);
|
||||
next->size = (blocksize - (dm->size +
|
||||
sizeof(dosmem_entry))) | DM_BLOCK_FREE;
|
||||
}
|
||||
else
|
||||
{
|
||||
dm->size &= DM_BLOCK_MASK;
|
||||
}
|
||||
|
||||
/*
|
||||
* Adjust available memory if block size changes.
|
||||
*/
|
||||
info_block->free += orgsize - dm->size;
|
||||
|
||||
return size;
|
||||
/* collapse free blocks */
|
||||
DOSMEM_Collapse( mcb );
|
||||
|
||||
/* shrink mcb ? */
|
||||
if (mcb->size > size)
|
||||
{
|
||||
next = (MCB *) ((char*)mcb + ((size+1) << 4));
|
||||
next->type = mcb->type;
|
||||
next->psp = MCB_PSP_FREE;
|
||||
next->size = mcb->size - (size+1);
|
||||
mcb->type = MCB_TYPE_NORMAL;
|
||||
mcb->size = size;
|
||||
return size << 4;
|
||||
}
|
||||
|
||||
if (!exact)
|
||||
{
|
||||
return mcb->size << 4;
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
@ -418,39 +398,30 @@ UINT DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact)
|
||||
*/
|
||||
UINT DOSMEM_Available(void)
|
||||
{
|
||||
UINT blocksize, available = 0;
|
||||
dosmem_entry *dm;
|
||||
|
||||
dm = DOSMEM_RootBlock();
|
||||
|
||||
while (dm && dm->size != DM_BLOCK_TERMINAL)
|
||||
{
|
||||
UINT available = 0;
|
||||
UINT total = 0;
|
||||
MCB *curr = DOSMEM_root_block;
|
||||
/* loop over all MCB and search the largest free MCB */
|
||||
while (curr)
|
||||
{
|
||||
#ifdef __DOSMEM_DEBUG__
|
||||
if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
|
||||
{
|
||||
WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)prev);
|
||||
return NULL;
|
||||
}
|
||||
prev = dm;
|
||||
MCB_DUMP( curr );
|
||||
#endif
|
||||
if( dm->size & DM_BLOCK_FREE )
|
||||
{
|
||||
dosmem_entry *next = next_block(dm);
|
||||
|
||||
while ( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
|
||||
{
|
||||
dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
|
||||
next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
|
||||
next = next_block(dm);
|
||||
}
|
||||
|
||||
blocksize = dm->size & DM_BLOCK_MASK;
|
||||
if ( blocksize > available ) available = blocksize;
|
||||
dm = next;
|
||||
}
|
||||
else dm = next_block(dm);
|
||||
}
|
||||
return available;
|
||||
if (!MCB_VALID (curr))
|
||||
{
|
||||
ERR( "MCB List Corrupt\n" );
|
||||
MCB_DUMP( curr );
|
||||
return 0;
|
||||
}
|
||||
if (curr->psp == MCB_PSP_FREE &&
|
||||
curr->size > available )
|
||||
available = curr->size;
|
||||
|
||||
total += curr->size + 1;
|
||||
curr = MCB_NEXT( curr );
|
||||
}
|
||||
TRACE( " %04xh of %04xh paragraphs available\n", available, total );
|
||||
return available << 4;
|
||||
}
|
||||
|
||||
/***********************************************************************
|
||||
@ -460,26 +431,14 @@ UINT DOSMEM_Available(void)
|
||||
*/
|
||||
static void DOSMEM_InitMemory(char* addr)
|
||||
{
|
||||
dosmem_entry* root_block;
|
||||
dosmem_entry* dm;
|
||||
|
||||
DOSMEM_FillBiosSegments();
|
||||
DOSMEM_FillIsrTable();
|
||||
|
||||
DOSMEM_info_block = (dosmem_info*)addr;
|
||||
root_block = DOSMEM_RootBlock();
|
||||
root_block->size = DOSMEM_MemoryTop() - (((char*)root_block) + sizeof(dosmem_entry));
|
||||
|
||||
DOSMEM_info_block->blocks = 0;
|
||||
DOSMEM_info_block->free = root_block->size;
|
||||
|
||||
dm = next_block(root_block);
|
||||
dm->size = DM_BLOCK_TERMINAL;
|
||||
root_block->size |= DM_BLOCK_FREE
|
||||
#ifdef __DOSMEM_DEBUG__
|
||||
| DM_BLOCK_DEBUG
|
||||
#endif
|
||||
;
|
||||
/* align root block to paragraph */
|
||||
DOSMEM_root_block = (MCB*) (( (DWORD_PTR)(addr+0xf) >> 4) << 4);
|
||||
DOSMEM_root_block->type = MCB_TYPE_LAST;
|
||||
DOSMEM_root_block->psp = MCB_PSP_FREE;
|
||||
DOSMEM_root_block->size = (DOSMEM_MemoryTop() - ((char*)DOSMEM_root_block)) >> 4;
|
||||
|
||||
TRACE("DOS conventional memory initialized, %d bytes free.\n",
|
||||
DOSMEM_Available());
|
||||
|
||||
Loading…
Reference in New Issue
Block a user