text: 
  #define NO_MEM ((phys_clicks) 0)  /* returned by alloc_mem() with mem is up */
  
  /* Memory flags to pt_allocmap() and alloc_mem(). */
  #define PAF_CLEAR	0x01	/* Clear physical memory. */
  #define PAF_CONTIG	0x02	/* Physically contiguous. */
  #define PAF_ALIGN64K	0x04	/* Aligned to 64k boundary. */
  #define PAF_LOWER16MB	0x08
  #define PAF_LOWER1MB	0x10
  #define PAF_FIRSTBLOCK	0x20	/* alloc_mem: return first block */
  
  #define MARK do { if(mark) { printf("%d\n", __LINE__); } } while(0)
  
  /* special value for v in pt_allocmap */
  #define AM_AUTO         ((u32_t) -1)
  
  #define CLICK2ABS(v) ((v) << CLICK_SHIFT)
  #define ABS2CLICK(a) ((a) >> CLICK_SHIFT)
  
  /* Compile in asserts and custom sanity checks at all? */
  #define SANITYCHECKS	0
  #define VMSTATS		0
  
  /* How noisy are we supposed to be? */
  #define VERBOSE		0
  
  /* Minimum stack region size - 64MB. */
  #define MINSTACKREGION	(64*1024*1024)
  
  /* If so, this level: */
  #define SCL_NONE	0	/* No sanity checks - assert()s only. */
  #define SCL_TOP		1	/* Main loop and other high-level places. */
  #define SCL_FUNCTIONS	2	/* Function entry/exit. */
  #define SCL_DETAIL	3	/* Detailled steps. */
  #define SCL_MAX		3	/* Highest value. */
  
  /* Type of page allocations. */
  #define VMP_SPARE	0
  #define VMP_PAGETABLE	1
  #define VMP_PAGEDIR	2
  #define VMP_SLAB	3
  #define VMP_CATEGORIES	4
  
  /* Flags to pt_writemap(). */
  #define WMF_OVERWRITE		0x01	/* Caller knows map may overwrite. */
  #define WMF_WRITEFLAGSONLY	0x02	/* Copy physaddr and update flags. */
  #define WMF_FREE		0x04	/* Free pages overwritten. */
  #define WMF_VERIFY		0x08	/* Check pagetable contents. */
  
  #define MAP_NONE	0xFFFFFFFE
  
  