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- /*
- * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
- * Copyright 2000 - 2001 Silicon Graphics, Inc.
- * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com)
- */
- #include <linux/init.h>
- #include <linux/mm.h>
- #include <linux/mmzone.h>
- #include <linux/kernel.h>
- #include <linux/nodemask.h>
- #include <linux/string.h>
- #include <asm/page.h>
- #include <asm/sections.h>
- #include <asm/sn/types.h>
- #include <asm/sn/arch.h>
- #include <asm/sn/gda.h>
- #include <asm/sn/hub.h>
- #include <asm/sn/mapped_kernel.h>
- #include <asm/sn/sn_private.h>
- static cpumask_t ktext_repmask;
- /*
- * XXX - This needs to be much smarter about where it puts copies of the
- * kernel. For example, we should never put a copy on a headless node,
- * and we should respect the topology of the machine.
- */
- void __init setup_replication_mask(void)
- {
- /* Set only the master cnode's bit. The master cnode is always 0. */
- cpumask_clear(&ktext_repmask);
- cpumask_set_cpu(0, &ktext_repmask);
- #ifdef CONFIG_REPLICATE_KTEXT
- #ifndef CONFIG_MAPPED_KERNEL
- #error Kernel replication works with mapped kernel support. No calias support.
- #endif
- {
- cnodeid_t cnode;
- for_each_online_node(cnode) {
- if (cnode == 0)
- continue;
- /* Advertise that we have a copy of the kernel */
- cpumask_set_cpu(cnode, &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()
- {
- cnodeid_t cnode;
- 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(cnode) {
- if (cnode == 0)
- continue;
- client_nasid = COMPACT_TO_NASID_NODEID(cnode);
- /* Check if this node should get a copy of the kernel */
- if (cpumask_test_cpu(cnode, &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(cnodeid_t cnode)
- {
- unsigned long loadbase = REP_BASE;
- nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
- unsigned long offset;
- #ifdef CONFIG_MAPPED_KERNEL
- loadbase += 16777216;
- #endif
- offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
- if ((cnode == 0) || (cpumask_test_cpu(cnode, &ktext_repmask)))
- return TO_NODE(nasid, offset) >> PAGE_SHIFT;
- else
- return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT;
- }
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