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ip27-klnuma.c

/*
 * 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/mmzone.h>
#include <linux/kernel.h>
#include <linux/nodemask.h>
#include <linux/string.h>

#include <asm/page.h>
#include <asm/sections.h>
#include <asm/smp.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. */
      cpus_clear(ktext_repmask);
      cpu_set(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 */
                  cpu_set(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)
{
      cnodeid_t client_cnode;
      kern_vars_t *kvp;

      client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);

      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 (cpu_isset(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).
 */
pfn_t 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) || (cpu_isset(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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