PR_CSTS
while ((mfpr(PR_CSTS) & 0x80) == 0)
#define WAIT while ((mfpr(PR_CSTS) & 0x80) == 0)
mtpr(0101, PR_CSTS); /* Enable transmit interrupt + send break */
mtpr(0101, PR_CSTS); /* Enable transmit interrupt + send break */
mtpr(0, PR_CSTS);
#define WAIT while ((mfpr(PR_CSTS) & 0x80) == 0)
while ((mfpr(PR_CSTS) & 0x80) == 0)