static int open_mapping_f(int cap)
{
int mapsize, estsize, padsize;
if (cap) Q_printf("MAPPING: open, cap=%s\n",
decode_mapping_cap(cap));
padsize = 4*1024;
/* first estimate the needed size of the mapfile */
mapsize = HMASIZE >> 10; /* HMA */
/* VGAEMU */
mapsize += config.vgaemu_memsize ? config.vgaemu_memsize : 1024;
mapsize += config.ems_size; /* EMS */
mapsize += LOWMEM_SIZE >> 10; /* Low Mem */
estsize = mapsize;
/* keep heap fragmentation in mind */
mapsize += (mapsize/4 < padsize ? padsize : mapsize/4);
mpool_numpages = mapsize / 4;
mapsize = mpool_numpages * PAGE_SIZE; /* make sure we are page aligned */
ftruncate(tmpfile_fd, 0);
if (ftruncate(tmpfile_fd, mapsize) == -1) {
if (!cap)
error("MAPPING: cannot size temp file pool, %s\n",strerror(errno));
discardtempfile();
if (!cap)return 0;
leavedos(2);
}
/* /dev/shm may be mounted noexec, and then mounting PROT_EXEC fails.
However mprotect may work around this (maybe not in future kernels)
*/
mpool = mmap(0, mapsize, PROT_READ|PROT_WRITE,
MAP_SHARED, tmpfile_fd, 0);
if (mpool == MAP_FAILED ||
mprotect(mpool, mapsize, PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
char *err = strerror(errno);
char s[] = "MAPPING: cannot size temp file pool, %s\n";
discardtempfile();
if (!cap) {
Q_printf(s,err);
return 0;
}
leavedos(2);
}
/* the memory pool itself can just be rw though */
mprotect(mpool, mapsize, PROT_READ|PROT_WRITE);
Q_printf("MAPPING: open, mpool (min %dK) is %d Kbytes at %p-%p\n",
estsize, mapsize/1024, mpool, mpool+mapsize-1);
sminit(&pgmpool, mpool, mapsize);
/*
* Now handle individual cases.
* Don't forget that each of the below code pieces should only
* be executed once !
*/
#if 0
if (cap & MAPPING_OTHER) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_EMS) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_DPMI) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_VIDEO) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_VGAEMU) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_HGC) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_HMA) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_SHARED) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_INIT_HWRAM) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_INIT_LOWRAM) {
/* none for now */
}
#endif
return 1;
}
static int open_mapping_shm(int cap)
{
static int first =1;
if (cap) Q_printf("MAPPING: open, cap=%s\n",
decode_mapping_cap(cap));
if (first) {
void *ptr1, *ptr2 = MAP_FAILED;
first = 0;
/* do a test alias mapping. kernel 2.6.1 doesn't support our mremap trick */
ptr1 = mmap(0, PAGE_SIZE, PROT_NONE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (ptr1 != MAP_FAILED) {
ptr2 = mremap(ptr1, 0, PAGE_SIZE, MREMAP_MAYMOVE);
munmap(ptr1, PAGE_SIZE);
if (ptr2 != MAP_FAILED)
munmap(ptr2, PAGE_SIZE);
}
if (ptr2 == MAP_FAILED) {
Q_printf("MAPPING: not using mapshm because alias mapping does not work\n");
if (!cap)return 0;
leavedos(2);
}
}
/*
* Now handle individual cases.
* Don't forget that each of the below code pieces should only
* be executed once !
*/
#if 0
if (cap & MAPPING_OTHER) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_EMS) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_DPMI) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_VIDEO) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_VGAEMU) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_HGC) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_HMA) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_SHARED) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_INIT_HWRAM) {
/* none for now */
}
#endif
#if 0
if (cap & MAPPING_INIT_LOWRAM) {
/* none for now */
}
#endif
return 1;
}
static void close_mapping_file(int cap)
{
Q_printf("MAPPING: close, cap=%s\n", decode_mapping_cap(cap));
if (cap == MAPPING_ALL && tmpfile_fd != -1) discardtempfile();
}
static void close_mapping_shm(int cap)
{
Q_printf("MAPPING: close, cap=%s\n", decode_mapping_cap(cap));
}
