arch/mips/sgi-ip27/ip27-klnuma.c

Source file repositories/reference/linux-study-clean/arch/mips/sgi-ip27/ip27-klnuma.c

File Facts

System
Linux kernel
Corpus path
arch/mips/sgi-ip27/ip27-klnuma.c
Extension
.c
Size
3611 bytes
Lines
130
Domain
Architecture Layer
Bucket
arch/mips
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

for_each_online_node(nasid) {
			if (nasid == 0)
				continue;
			/* Advertise that we have a copy of the kernel */
			node_set(nasid, ktext_repmask);
		}
	}
#endif
	/* Set up a GDA pointer to the replication mask. */
	GDA->g_ktext_repmask = &ktext_repmask;
}


static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
{
	kern_vars_t *kvp;

	kvp = &hub_data(client_nasid)->kern_vars;

	KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;

	kvp->kv_magic = KV_MAGIC;
	kvp->kv_ro_nasid = server_nasid;
	kvp->kv_rw_nasid = master_nasid;
	kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
	kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
	printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
}

/* XXX - When the BTE works, we should use it instead of this. */
static __init void copy_kernel(nasid_t dest_nasid)
{
	unsigned long dest_kern_start, source_start, source_end, kern_size;

	source_start = (unsigned long) _stext;
	source_end = (unsigned long) _etext;
	kern_size = source_end - source_start;

	dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
					    dest_nasid);
	memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
}

void __init replicate_kernel_text(void)
{
	nasid_t client_nasid;
	nasid_t server_nasid;

	server_nasid = master_nasid;

	/* Record where the master node should get its kernel text */
	set_ktext_source(master_nasid, master_nasid);

	for_each_online_node(client_nasid) {
		if (client_nasid == 0)
			continue;

		/* Check if this node should get a copy of the kernel */
		if (node_isset(client_nasid, ktext_repmask)) {
			server_nasid = client_nasid;
			copy_kernel(server_nasid);
		}

		/* Record where this node should get its kernel text */
		set_ktext_source(client_nasid, server_nasid);
	}
}

/*
 * Return pfn of first free page of memory on a node. PROM may allocate
 * data structures on the first couple of pages of the first slot of each
 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
 */
unsigned long node_getfirstfree(nasid_t nasid)
{
	unsigned long loadbase = REP_BASE;
	unsigned long offset;

#ifdef CONFIG_MAPPED_KERNEL
	loadbase += 16777216;
#endif
	offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
	if ((nasid == 0) || (node_isset(nasid, ktext_repmask)))
		return TO_NODE(nasid, offset) >> PAGE_SHIFT;
	else
		return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT;
}

Annotation

Implementation Notes