arch/sparc/kernel/starfire.c

Source file repositories/reference/linux-study-clean/arch/sparc/kernel/starfire.c

File Facts

System
Linux kernel
Corpus path
arch/sparc/kernel/starfire.c
Extension
.c
Size
2620 bytes
Lines
113
Domain
Architecture Layer
Bucket
arch/sparc
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

struct starfire_irqinfo {
	unsigned long imap_slots[32];
	unsigned long tregs[32];
	struct starfire_irqinfo *next;
	int upaid, hwmid;
};

static struct starfire_irqinfo *sflist = NULL;

/* Beam me up Scott(McNeil)y... */
void starfire_hookup(int upaid)
{
	struct starfire_irqinfo *p;
	unsigned long treg_base, hwmid, i;

	p = kmalloc_obj(*p);
	if (!p) {
		prom_printf("starfire_hookup: No memory, this is insane.\n");
		prom_halt();
	}
	treg_base = 0x100fc000000UL;
	hwmid = ((upaid & 0x3c) << 1) |
		((upaid & 0x40) >> 4) |
		(upaid & 0x3);
	p->hwmid = hwmid;
	treg_base += (hwmid << 33UL);
	treg_base += 0x200UL;
	for (i = 0; i < 32; i++) {
		p->imap_slots[i] = 0UL;
		p->tregs[i] = treg_base + (i * 0x10UL);
		/* Lets play it safe and not overwrite existing mappings */
		if (upa_readl(p->tregs[i]) != 0)
			p->imap_slots[i] = 0xdeadbeaf;
	}
	p->upaid = upaid;
	p->next = sflist;
	sflist = p;
}

unsigned int starfire_translate(unsigned long imap,
				unsigned int upaid)
{
	struct starfire_irqinfo *p;
	unsigned int bus_hwmid;
	unsigned int i;

	bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f;
	for (p = sflist; p != NULL; p = p->next)
		if (p->hwmid == bus_hwmid)
			break;
	if (p == NULL) {
		prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n",
			    ((unsigned long)imap));
		prom_halt();
	}
	for (i = 0; i < 32; i++) {
		if (p->imap_slots[i] == imap ||
		    p->imap_slots[i] == 0UL)
			break;
	}
	if (i == 32) {
		printk("starfire_translate: Are you kidding me?\n");
		panic("Lucy in the sky....");
	}
	p->imap_slots[i] = imap;

	/* map to real upaid */
	upaid = (((upaid & 0x3c) << 1) |
		 ((upaid & 0x40) >> 4) |
		 (upaid & 0x3));

	upa_writel(upaid, p->tregs[i]);

	return i;
}

Annotation

Implementation Notes