ref: 41e27b2d10c6a60c49931332e8677438736a1e36
dir: /os/boot/puma/rmap.c/
#include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h" void mapinit(RMap *rmap, Map *map, int size) { lock(rmap); rmap->map = map; rmap->mapend = map+(size/sizeof(Map)); unlock(rmap); } void mapfree(RMap* rmap, ulong addr, int size) { Map *mp; ulong t; if(size <= 0) return; lock(rmap); for(mp = rmap->map; mp->addr <= addr && mp->size; mp++) ; if(mp > rmap->map && (mp-1)->addr+(mp-1)->size == addr){ (mp-1)->size += size; if(addr+size == mp->addr){ (mp-1)->size += mp->size; while(mp->size){ mp++; (mp-1)->addr = mp->addr; (mp-1)->size = mp->size; } } } else{ if(addr+size == mp->addr && mp->size){ mp->addr -= size; mp->size += size; } else do{ if(mp >= rmap->mapend){ print("mapfree: %s: losing 0x%uX, %d\n", rmap->name, addr, size); break; } t = mp->addr; mp->addr = addr; addr = t; t = mp->size; mp->size = size; mp++; }while(size = t); } unlock(rmap); } ulong mapalloc(RMap* rmap, ulong addr, int size, int align) { Map *mp; ulong maddr, oaddr; lock(rmap); for(mp = rmap->map; mp->size; mp++){ maddr = mp->addr; if(addr){ if(maddr > addr) continue; if(addr+size > maddr+mp->size) break; maddr = addr; } if(align > 0) maddr = ((maddr+align-1)/align)*align; if(mp->addr+mp->size-maddr < size) continue; oaddr = mp->addr; mp->addr = maddr+size; mp->size -= maddr-oaddr+size; if(mp->size == 0){ do{ mp++; (mp-1)->addr = mp->addr; }while((mp-1)->size = mp->size); } unlock(rmap); if(oaddr != maddr) mapfree(rmap, oaddr, maddr-oaddr); return maddr; } unlock(rmap); return 0; }