AHCI_PREG_IS
is = ahci_pread(ap, AHCI_PREG_IS);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_PRCS);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_PCS | AHCI_PREG_IS_PRCS);
ahci_pwrite(ap, AHCI_PREG_IS, -1);
is = ahci_pread(ap, AHCI_PREG_IS);
ahci_pwrite(ap, AHCI_PREG_IS, is & AHCI_PREG_IS_DPS);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_TFES |
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_DHRS);
ahci_pwrite(ap, AHCI_PREG_IS,
ahci_pwrite(ap, AHCI_PREG_IS,
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_IFS);
ahci_pwrite(ap, AHCI_PREG_IS,
ahci_pwrite(ap, AHCI_PREG_IS,
ahci_pwrite(ap, AHCI_PREG_IS,
AHCI_PFMT_IS, ahci_pread(ap, AHCI_PREG_IS),
ahci_pwrite(ap, AHCI_PREG_IS, -1);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_PRCS);
ahci_pwrite(ap, AHCI_PREG_IS, ahci_pread(ap, AHCI_PREG_IS));
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_IFS);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_IFS);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_IFS);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_IFS);
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_IFS);