void *dos_getmaxlockedmem(int *size)
{
__dpmi_free_mem_info meminfo;
__dpmi_meminfo info;
int working_size;
void *working_memory;
int last_locked;
int extra, i, j, allocsize;
static char *msg = "Locking data...";
int m, n;
byte *x;
// first lock all the current executing image so the locked count will
// be accurate. It doesn't hurt to lock the memory multiple times
last_locked = __djgpp_selector_limit + 1;
info.size = last_locked - 4096;
info.address = __djgpp_base_address + 4096;
if (lockmem)
{
if(__dpmi_lock_linear_region(&info))
{
Sys_Error ("Lock of current memory at 0x%lx for %ldKb failed!\n",
info.address, info.size/1024);
}
}
__dpmi_get_free_memory_information(&meminfo);
if (!win95) /* Not windows or earlier than Win95 */
{
working_size = meminfo.maximum_locked_page_allocation_in_pages * 4096;
}
else
{
working_size = meminfo.largest_available_free_block_in_bytes -
LEAVE_FOR_CACHE;
}
working_size &= ~0xffff; /* Round down to 64K */
working_size += 0x10000;
do
{
working_size -= 0x10000; /* Decrease 64K and try again */
working_memory = sbrk(working_size);
} while (working_memory == (void *)-1);
extra = 0xfffc - ((unsigned)sbrk(0) & 0xffff);
if (extra > 0)
{
sbrk(extra);
working_size += extra;
}
// now grab the memory
info.address = last_locked + __djgpp_base_address;
if (!win95)
{
info.size = __djgpp_selector_limit + 1 - last_locked;
while (info.size > 0 && __dpmi_lock_linear_region(&info))
{
info.size -= 0x1000;
working_size -= 0x1000;
sbrk(-0x1000);
}
}
else
{ /* Win95 section */
j = COM_CheckParm("-winmem");
if (standard_quake)
minmem = MINIMUM_WIN_MEMORY;
else
minmem = MINIMUM_WIN_MEMORY_LEVELPAK;
if (j)
{
allocsize = ((int)(Q_atoi(com_argv[j+1]))) * 0x100000 +
LOCKED_FOR_MALLOC;
if (allocsize < (minmem + LOCKED_FOR_MALLOC))
allocsize = minmem + LOCKED_FOR_MALLOC;
}
else
{
allocsize = minmem + LOCKED_FOR_MALLOC;
}
if (!lockmem)
{
// we won't lock, just sbrk the memory
info.size = allocsize;
goto UpdateSbrk;
}
// lock the memory down
write (STDOUT, msg, strlen (msg));
for (j=allocsize ; j>(minmem + LOCKED_FOR_MALLOC) ;
j -= 0x100000)
{
info.size = j;
if (!__dpmi_lock_linear_region(&info))
goto Locked;
write (STDOUT, ".", 1);
}
// finally, try with the absolute minimum amount
for (i=0 ; i<10 ; i++)
{
info.size = minmem + LOCKED_FOR_MALLOC;
if (!__dpmi_lock_linear_region(&info))
goto Locked;
}
Sys_Error ("Can't lock memory; %d Mb lockable RAM required. "
"Try shrinking smartdrv.", info.size / 0x100000);
Locked:
UpdateSbrk:
info.address += info.size;
info.address -= __djgpp_base_address + 4; // ending point, malloc align
working_size = info.address - (int)working_memory;
sbrk(info.address-(int)sbrk(0)); // negative adjustment
}
if (lockunlockmem)
{
__dpmi_unlock_linear_region (&info);
printf ("Locked and unlocked %d Mb data\n", working_size / 0x100000);
}
else if (lockmem)
{
printf ("Locked %d Mb data\n", working_size / 0x100000);
}
else
{
printf ("Allocated %d Mb data\n", working_size / 0x100000);
}
// touch all the memory to make sure it's there. The 16-page skip is to
// keep Win 95 from thinking we're trying to page ourselves in (we are
// doing that, of course, but there's no reason we shouldn't)
x = (byte *)working_memory;
for (n=0 ; n<4 ; n++)
{
for (m=0 ; m<(working_size - 16 * 0x1000) ; m += 4)
{
sys_checksum += *(int *)&x[m];
sys_checksum += *(int *)&x[m + 16 * 0x1000];
}
}
// give some of what we locked back for malloc before returning. Done
// by cheating and passing a negative value to sbrk
working_size -= LOCKED_FOR_MALLOC;
sbrk( -(LOCKED_FOR_MALLOC));
*size = working_size;
return working_memory;
}
extern uint64_t
tuklib_physmem(void)
{
uint64_t ret = 0;
#if defined(_WIN32) || defined(__CYGWIN__)
if ((GetVersion() & 0xFF) >= 5) {
// Windows 2000 and later have GlobalMemoryStatusEx() which
// supports reporting values greater than 4 GiB. To keep the
// code working also on older Windows versions, use
// GlobalMemoryStatusEx() conditionally.
HMODULE kernel32 = GetModuleHandle("kernel32.dll");
if (kernel32 != NULL) {
BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
kernel32, "GlobalMemoryStatusEx");
if (gmse != NULL) {
MEMORYSTATUSEX meminfo;
meminfo.dwLength = sizeof(meminfo);
if (gmse(&meminfo))
ret = meminfo.ullTotalPhys;
}
}
}
if (ret == 0) {
// GlobalMemoryStatus() is supported by Windows 95 and later,
// so it is fine to link against it unconditionally. Note that
// GlobalMemoryStatus() has no return value.
MEMORYSTATUS meminfo;
meminfo.dwLength = sizeof(meminfo);
GlobalMemoryStatus(&meminfo);
ret = meminfo.dwTotalPhys;
}
#elif defined(__OS2__)
unsigned long mem;
if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM,
&mem, sizeof(mem)) == 0)
ret = mem;
#elif defined(__DJGPP__)
__dpmi_free_mem_info meminfo;
if (__dpmi_get_free_memory_information(&meminfo) == 0
&& meminfo.total_number_of_physical_pages
!= (unsigned long)-1)
ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096;
#elif defined(__VMS)
int vms_mem;
int val = SYI$_MEMSIZE;
if (LIB$GETSYI(&val, &vms_mem, 0, 0, 0, 0) == SS$_NORMAL)
ret = (uint64_t)vms_mem * 8192;
#elif defined(AMIGA) || defined(__AROS__)
ret = AvailMem(MEMF_TOTAL);
#elif defined(TUKLIB_PHYSMEM_AIX)
ret = _system_configuration.physmem;
#elif defined(TUKLIB_PHYSMEM_SYSCONF)
const long pagesize = sysconf(_SC_PAGESIZE);
const long pages = sysconf(_SC_PHYS_PAGES);
if (pagesize != -1 && pages != -1)
// According to docs, pagesize * pages can overflow.
// Simple case is 32-bit box with 4 GiB or more RAM,
// which may report exactly 4 GiB of RAM, and "long"
// being 32-bit will overflow. Casting to uint64_t
// hopefully avoids overflows in the near future.
ret = (uint64_t)pagesize * (uint64_t)pages;
#elif defined(TUKLIB_PHYSMEM_SYSCTL)
int name[2] = {
CTL_HW,
#ifdef HW_PHYSMEM64
HW_PHYSMEM64
#else
HW_PHYSMEM
#endif
};
union {
uint32_t u32;
uint64_t u64;
} mem;
size_t mem_ptr_size = sizeof(mem.u64);
if (sysctl(name, 2, &mem.u64, &mem_ptr_size, NULL, 0) != -1) {
// IIRC, 64-bit "return value" is possible on some 64-bit
// BSD systems even with HW_PHYSMEM (instead of HW_PHYSMEM64),
// so support both.
if (mem_ptr_size == sizeof(mem.u64))
ret = mem.u64;
else if (mem_ptr_size == sizeof(mem.u32))
ret = mem.u32;
}
#elif defined(TUKLIB_PHYSMEM_GETSYSINFO)
// Docs are unclear if "start" is needed, but it doesn't hurt
// much to have it.
int memkb;
int start = 0;
if (getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start)
!= -1)
ret = (uint64_t)memkb * 1024;
#elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
struct pst_static pst;
if (pstat_getstatic(&pst, sizeof(pst), 1, 0) != -1)
ret = (uint64_t)pst.physical_memory * (uint64_t)pst.page_size;
#elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
inv_state_t *st = NULL;
if (setinvent_r(&st) != -1) {
inventory_t *i;
while ((i = getinvent_r(st)) != NULL) {
if (i->inv_class == INV_MEMORY
&& i->inv_type == INV_MAIN_MB) {
ret = (uint64_t)i->inv_state << 20;
break;
}
}
endinvent_r(st);
}
#elif defined(TUKLIB_PHYSMEM_SYSINFO)
struct sysinfo si;
if (sysinfo(&si) == 0)
ret = (uint64_t)si.totalram * si.mem_unit;
#endif
return ret;
}
