Vhex is a kernel which provide development and retro ingenierie platform for the Casio's OS
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#include <kernel/memory.h>
#include <kernel/util/atomic.h>
#include <kernel/devices/earlyterm.h>
static int pm_block_free(struct pm_heap_page *page, void *ptr)
{
struct pm_heap_block *block_parent;
struct pm_heap_block *block;
block_parent = NULL;
block = &page->heap;
while ((void*)&block[1] < page->brk)
{
// check block validity
if ((void*)&block[1] != ptr)
{
block_parent = block;
block = (void*)&block[1] + block->size;
continue;
}
// Try back-merge / front merge
pm_block_backmerge(&block, block_parent);
pm_block_frontmerge(block, page->brk);
// Update block status
block->status = 0;
return (0);
}
return (-1);
}
void pm_heap_free(struct pm_heap_page *page, void *ptr)
{
// Start atomic operations
atomic_start();
// Try to find the page
while (page != NULL)
{
// If is the page is found
if (ptr > (void*)page && ptr < page->brk)
{
// Check if the block is not found
if (pm_block_free(page, ptr) != 0)
break;
// Stop atomic operations and return
atomic_stop();
return;
}
// Get the next page
page = page->next;
}
// No block found, display error.
earlyterm_write(
"pm_free: Warning, you try to free unused"
" or allocated memory (%p)\n", ptr
);
DBG_WAIT;
// Stop atomic operations
atomic_stop();
}