arch/alpha/kernel/sys_nautilus.c

Source file repositories/reference/linux-study-clean/arch/alpha/kernel/sys_nautilus.c

File Facts

System
Linux kernel
Corpus path
arch/alpha/kernel/sys_nautilus.c
Extension
.c
Size
7364 bytes
Lines
296
Domain
Architecture Layer
Bucket
arch/alpha
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (! alpha_using_srm) {
			u8 t8;
			pci_bus_read_config_byte(bus, 0x38, 0x43, &t8);
			pci_bus_write_config_byte(bus, 0x38, 0x43, t8 | 0x80);
			outb(1, 0x92);
			outb(0, 0x92);
			/* NOTREACHED */
		}
		break;

	case LINUX_REBOOT_CMD_POWER_OFF:
		/* Assume M1543C */
		off = 0x2000;		/* SLP_TYPE = 0, SLP_EN = 1 */
		pci_bus_read_config_dword(bus, 0x88, 0x10, &pmuport);
		if (!pmuport) {
			/* M1535D/D+ */
			off = 0x3400;	/* SLP_TYPE = 5, SLP_EN = 1 */
			pci_bus_read_config_dword(bus, 0x88, 0xe0, &pmuport);
		}
		pmuport &= 0xfffe;
		outw(0xffff, pmuport);	/* Clear pending events. */
		outw(off, pmuport + 4);
		/* NOTREACHED */
		break;
	}
}

/* Perform analysis of a machine check that arrived from the system (NMI) */

static void
naut_sys_machine_check(unsigned long vector, unsigned long la_ptr,
		       struct pt_regs *regs)
{
	printk("PC %lx RA %lx\n", regs->pc, regs->r26);
	irongate_pci_clr_err();
}

/* Machine checks can come from two sources - those on the CPU and those
   in the system.  They are analysed separately but all starts here.  */

static void
nautilus_machine_check(unsigned long vector, unsigned long la_ptr)
{
	char *mchk_class;

	/* Now for some analysis.  Machine checks fall into two classes --
	   those picked up by the system, and those picked up by the CPU.
	   Add to that the two levels of severity - correctable or not.  */

	if (vector == SCB_Q_SYSMCHK
	    && ((IRONGATE0->dramms & 0x300) == 0x300)) {
		unsigned long nmi_ctl;

		/* Clear ALI NMI */
		nmi_ctl = inb(0x61);
		nmi_ctl |= 0x0c;
		outb(nmi_ctl, 0x61);
		nmi_ctl &= ~0x0c;
		outb(nmi_ctl, 0x61);

		/* Write again clears error bits.  */
		IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100;
		mb();
		IRONGATE0->stat_cmd;

		/* Write again clears error bits.  */
		IRONGATE0->dramms = IRONGATE0->dramms;
		mb();
		IRONGATE0->dramms;

		draina();
		wrmces(0x7);
		mb();
		return;
	}

	if (vector == SCB_Q_SYSERR)
		mchk_class = "Correctable";
	else if (vector == SCB_Q_SYSMCHK)
		mchk_class = "Fatal";
	else {
		ev6_machine_check(vector, la_ptr);
		return;
	}

	printk(KERN_CRIT "NAUTILUS Machine check 0x%lx "
			 "[%s System Machine Check (NMI)]\n",
	       vector, mchk_class);

	naut_sys_machine_check(vector, la_ptr, get_irq_regs());

Annotation

Implementation Notes