text: /*
   * Attach segment types
   */
  
  typedef struct Physseg Physseg;
  struct Physseg
  {
  	ulong	attr;			/* Segment attributes */
  	char	*name;			/* Attach name */
  	ulong	pa;			/* Physical address */
  	ulong	size;			/* Maximum segment size in pages */
  	Page	*(*pgalloc)(ulong);	/* Allocation if we need it */
  	void	(*pgfree)(Page*);
  }physseg[] = {
  	{ SG_PHYSICAL,	"lock",		0,	1024*BY2PG,	lkpage,		lkpgfree },
  	{ SG_SHARED,	"shared",	0,	SEGMAXSIZE,	snewpage, 	putpage },
  	{ SG_BSS,	"memory",	0,	SEGMAXSIZE,	snewpage,	putpage },
  	{ 0,		0,		0,	0,		0,		0 	},
  };
  