void deallocate_starting_address(puint_t address, size_t size) {
if (size < 0x10000)
return; // ignore section and just leave it as dead memory
section_info_t* se = frame_pool;
while (se->next_section != NULL)
se = se->next_section;
make_pool(size, address, se, NULL);
}
int main(void)
{
char word[100];
Pool wordpool;
dict = Dict_open(NULL);
while (printf("word> "), fflush(stdout),
fgets(word, sizeof(word), stdin),
(lenall = make_pool(word, &wordpool)) != 0) {
for (len1=lenall; len1>=(lenall+2)/3; len1--) {
find_subwords(&wordpool, len1, find_second_and_third);
}
}
Dict_close(dict);
return 0;
}
void test(void)
{
char *x1, *x2, *x3, *x4, *x5;
pool *p = make_pool();
push(p);
x1 = allocate(p, 10);
x2 = allocate(p, 20);
push(p);
x3 = allocate(p, 10);
x4 = allocate(p, 20);
*x1 = 'a';
*x2 = 'b';
x1[-1] = 'h';
x1[10] = 'i';
pop(p);
*x3 = 'c';
*x4 = 'd';
*x1 = 'e';
*x2 = 'f';
x5 = allocate(p, 10);
*x5 = 'g';
}
void test(void)
{
char *x1, *x2, *x3, *x4, *x5;
pool *p = make_pool();
push(p);
x1 = allocate(p, 10);
x2 = allocate(p, 20);
push(p);
x3 = allocate(p, 10);
x4 = allocate(p, 20);
*x1 = 'a'; // valid
*x2 = 'b'; // valid
x1[-1] = 'h'; // invalid
x1[10] = 'i'; // invalid
pop(p);
*x3 = 'c'; // invalid
*x4 = 'd'; // invalid
*x1 = 'e'; // valid
*x2 = 'f'; // valid
x5 = allocate(p, 10);
*x5 = 'g'; // valid
// pop(p);
// *x5 = 'g'; // invalid
// destroy_pool(p);
}
int main(int argc, char **argv)
{
Pool wordpool;
int len, i;
int found1st;
if (argc != 2) {
fprintf(stderr, "Usage: %s letters\n", argv[0]);
exit(2);
}
dict = Dict_open(NULL);
len = make_pool(argv[1], &wordpool);
found = found1st = FALSE;
for (i=len; i>=0 && !(found && found1st); i--) {
if (found) {found1st=TRUE; found=FALSE;}
find_subwords(&wordpool, i, print_word_and_remainder);
}
Dict_close(dict);
return 0;
}
/**
* Creates frame map from multiboot structure.
*
* Fills bitmaps for frame_map_usage, phys_map and returns bitmap for frame_map
* from available ram entries.
*/
static void create_frame_pool(struct multiboot_info* mboot_addr) {
section_info_t* firstfp = NULL;
section_info_t* lastfp = NULL;
if ((mboot_addr->flags & 0b100000) == 0b100000) {
uint32_t mem = mboot_addr->mmap_addr + 4;
while (mem < (mboot_addr->mmap_addr + mboot_addr->mmap_length)) {
mboot_mem_t data = *((mboot_mem_t*) (uint64_t) mem);
uint32_t size = *((uint32_t*) (uint64_t) (mem - 4));
mem += size + 4;
puint_t ba = data.address;
size_t len = data.size;
if (data.type != 1) // not a ram
continue;
if (len < 0x10000)
continue; // waste of a section
puint_t base_addr = ba;
size_t length = len;
while (true) {
// if we fail to find any useful starting address but there is more to search
// restart the search here
start_search_again:;
// search from current base_addr up to maximum in the block
if (base_addr >= len+ba)
break; // end of search
for (puint_t test = base_addr; test<len; test+=0x1000) {
if (check_if_used(mboot_addr, test)) {
// memory address is used by some internal structure
// write up how much size we have for this pool and then
// decide upon it
length = test - base_addr;
if (length == 0) {
// first 0x1000 already used
// check if there is more, if so, continue from 0x1000 onwards
// if not, this section is garbage
if (base_addr+0x1000<ba+len) {
base_addr += 0x1000;
goto start_search_again;
} else {
goto finish_this_section;
}
} else if (length < 0x10000) {
// pool with size <0x10000, same as above
// but add length, skipping good but too small pool
if (base_addr+length<ba+len) {
base_addr += length;
goto start_search_again;
} else {
goto finish_this_section;
}
}
// found a barrier, can only use this much in a block
goto use_length_found;
}
}
// no used address up to len, awesome, use this as a pool
length = len;
use_length_found:;
section_info_t* section = make_pool(length, base_addr, lastfp, &firstfp);
lastfp = section;
// increment base address by length
base_addr += length;
}
finish_this_section:;
}
}
// we have our pool, so we set it and thus disable temp. heap allocation for page structures
frame_pool = firstfp;
}
