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Give DOS applications 638k of free conventional memory.

This commit is contained in:
Jukka Heinonen 2002-12-12 02:16:02 +00:00 committed by Alexandre Julliard
parent 5f9e3ffdb9
commit 872f945044
1 changed files with 39 additions and 5 deletions
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44
msdos/dosmem.c
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@ -85,6 +85,11 @@ static char *DOSMEM_dosmem;
* and only relocated to NULL when absolutely necessary */
static char *DOSMEM_sysmem;
/* Start of DOS conventional memory */
static char *DOSMEM_membase;
static void DOSMEM_InitMemory(void);
/***********************************************************************
* DOSMEM_MemoryTop
*
@ -102,7 +107,36 @@ static char *DOSMEM_MemoryTop(void)
*/
static dosmem_info *DOSMEM_InfoBlock(void)
{
return (dosmem_info*)(DOSMEM_dosmem+0x10000); /* 64K */
if (!DOSMEM_membase)
{
DWORD reserve;
/*
* Reserve either:
* - lowest 64k for NULL pointer catching (Win16)
* - lowest 1k for interrupt handlers and
* another 0.5k for BIOS, DOS and intra-application
* areas (DOS)
*/
if (DOSMEM_dosmem != DOSMEM_sysmem)
reserve = 0x10000; /* 64k */
else
reserve = 0x600; /* 1.5k */
/*
* Round to paragraph boundary in order to make
* sure the alignment is correct.
*/
reserve = ((reserve + 15) >> 4) << 4;
/*
* Set DOS memory base and initialize conventional memory.
*/
DOSMEM_membase = DOSMEM_dosmem + reserve;
DOSMEM_InitMemory();
}
return (dosmem_info*)DOSMEM_membase;
}
/***********************************************************************
@ -311,9 +345,6 @@ static void DOSMEM_FillBiosSegments(void)
*/
static void DOSMEM_InitMemory(void)
{
/* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
* 1000:0000 and ends at 9FFF:FFEF. */
dosmem_info* info_block = DOSMEM_InfoBlock();
dosmem_entry* root_block = DOSMEM_RootBlock();
dosmem_entry* dm;
@ -330,8 +361,12 @@ static void DOSMEM_InitMemory(void)
| DM_BLOCK_DEBUG
#endif
;
TRACE( "DOS conventional memory initialized, %d bytes free.\n",
DOSMEM_Available() );
}
/**********************************************************************
* setup_dos_mem
*
@ -403,7 +438,6 @@ BOOL DOSMEM_Init(BOOL dos_init)
0x10000, 0, WINE_LDT_FLAGS_DATA );
DOSMEM_FillBiosSegments();
DOSMEM_FillIsrTable();
DOSMEM_InitMemory();
already_done = 1;
}
else if (dos_init && !already_mapped)