kolibrios/drivers/video/drm/i915/hmm.c
Sergey Semyonov (Serge) 88dd19b554 i915 hw blitter: Back in the game
git-svn-id: svn://kolibrios.org@3033 a494cfbc-eb01-0410-851d-a64ba20cac60
2012-11-13 09:18:58 +00:00

72 lines
1.1 KiB
C

#include <linux/types.h>
#include <syscall.h>
#include "hmm.h"
int init_hmm(struct hmm *mm, u32 count)
{
u32* data;
if( mm == NULL)
return -EINVAL;
data = malloc(count*sizeof(u32*));
if( data )
{
int i;
for(i = 0; i < count-1; )
data[i] = ++i;
data[i] = 0;
mm->table = data;
mm->next = 0;
mm->avail = count;
mm->count = count;
return 0;
};
return -ENOMEM;
};
u32 alloc_handle(struct hmm *mm)
{
u32 handle = 0;
u32 ifl;
ifl = safe_cli();
if(mm->avail)
{
handle = mm->next;
mm->next = mm->table[handle];
mm->avail--;
handle++;
}
safe_sti(ifl);
return handle;
};
int free_handle(struct hmm *mm, u32 handle)
{
int ret = -1;
u32 ifl;
handle--;
ifl = safe_cli();
if(handle < mm->count)
{
mm->table[handle] = mm->next;
mm->next = handle;
mm->avail++;
ret = 0;
};
safe_sti(ifl);
return ret;
};