static void __init get_srmmu_type()

in mm/srmmu.c [1543:1633]

• 69 lines of code
• 29 McCabe index (conditional complexity)

static void __init get_srmmu_type(void)
{
	unsigned long mreg, psr;
	unsigned long mod_typ, mod_rev, psr_typ, psr_vers;

	srmmu_modtype = SRMMU_INVAL_MOD;
	hwbug_bitmask = 0;

	mreg = srmmu_get_mmureg(); psr = get_psr();
	mod_typ = (mreg & 0xf0000000) >> 28;
	mod_rev = (mreg & 0x0f000000) >> 24;
	psr_typ = (psr >> 28) & 0xf;
	psr_vers = (psr >> 24) & 0xf;

	/* First, check for sparc-leon. */
	if (sparc_cpu_model == sparc_leon) {
		init_leon();
		return;
	}

	/* Second, check for HyperSparc or Cypress. */
	if (mod_typ == 1) {
		switch (mod_rev) {
		case 7:
			/* UP or MP Hypersparc */
			init_hypersparc();
			break;
		case 0:
		case 2:
		case 10:
		case 11:
		case 12:
		case 13:
		case 14:
		case 15:
		default:
			prom_printf("Sparc-Linux Cypress support does not longer exit.\n");
			prom_halt();
			break;
		}
		return;
	}

	/* Now Fujitsu TurboSparc. It might happen that it is
	 * in Swift emulation mode, so we will check later...
	 */
	if (psr_typ == 0 && psr_vers == 5) {
		init_turbosparc();
		return;
	}

	/* Next check for Fujitsu Swift. */
	if (psr_typ == 0 && psr_vers == 4) {
		phandle cpunode;
		char node_str[128];

		/* Look if it is not a TurboSparc emulating Swift... */
		cpunode = prom_getchild(prom_root_node);
		while ((cpunode = prom_getsibling(cpunode)) != 0) {
			prom_getstring(cpunode, "device_type", node_str, sizeof(node_str));
			if (!strcmp(node_str, "cpu")) {
				if (!prom_getintdefault(cpunode, "psr-implementation", 1) &&
				    prom_getintdefault(cpunode, "psr-version", 1) == 5) {
					init_turbosparc();
					return;
				}
				break;
			}
		}

		init_swift();
		return;
	}

	/* Now the Viking family of srmmu. */
	if (psr_typ == 4 &&
	   ((psr_vers == 0) ||
	    ((psr_vers == 1) && (mod_typ == 0) && (mod_rev == 0)))) {
		init_viking();
		return;
	}

	/* Finally the Tsunami. */
	if (psr_typ == 4 && psr_vers == 1 && (mod_typ || mod_rev)) {
		init_tsunami();
		return;
	}

	/* Oh well */
	srmmu_is_bad();
}