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

   1/*
   2 * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
   3 * Copyright 2000 - 2001 Silicon Graphics, Inc.
   4 * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com)
   5 */
   6#include <linux/init.h>
   7#include <linux/mm.h>
   8#include <linux/mmzone.h>
   9#include <linux/kernel.h>
  10#include <linux/nodemask.h>
  11#include <linux/string.h>
  12
  13#include <asm/page.h>
  14#include <asm/sections.h>
  15#include <asm/sn/types.h>
  16#include <asm/sn/arch.h>
  17#include <asm/sn/gda.h>
  18#include <asm/sn/hub.h>
  19#include <asm/sn/mapped_kernel.h>
  20#include <asm/sn/sn_private.h>
  21
  22static cpumask_t ktext_repmask;
  23
  24/*
  25 * XXX - This needs to be much smarter about where it puts copies of the
  26 * kernel.  For example, we should never put a copy on a headless node,
  27 * and we should respect the topology of the machine.
  28 */
  29void __init setup_replication_mask(void)
  30{
  31        /* Set only the master cnode's bit.  The master cnode is always 0. */
  32        cpus_clear(ktext_repmask);
  33        cpu_set(0, ktext_repmask);
  34
  35#ifdef CONFIG_REPLICATE_KTEXT
  36#ifndef CONFIG_MAPPED_KERNEL
  37#error Kernel replication works with mapped kernel support. No calias support.
  38#endif
  39        {
  40                cnodeid_t       cnode;
  41
  42                for_each_online_node(cnode) {
  43                        if (cnode == 0)
  44                                continue;
  45                        /* Advertise that we have a copy of the kernel */
  46                        cpu_set(cnode, ktext_repmask);
  47                }
  48        }
  49#endif
  50        /* Set up a GDA pointer to the replication mask. */
  51        GDA->g_ktext_repmask = &ktext_repmask;
  52}
  53
  54
  55static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
  56{
  57        kern_vars_t *kvp;
  58
  59        kvp = &hub_data(client_nasid)->kern_vars;
  60
  61        KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
  62
  63        kvp->kv_magic = KV_MAGIC;
  64        kvp->kv_ro_nasid = server_nasid;
  65        kvp->kv_rw_nasid = master_nasid;
  66        kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
  67        kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
  68        printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
  69}
  70
  71/* XXX - When the BTE works, we should use it instead of this. */
  72static __init void copy_kernel(nasid_t dest_nasid)
  73{
  74        unsigned long dest_kern_start, source_start, source_end, kern_size;
  75
  76        source_start = (unsigned long) _stext;
  77        source_end = (unsigned long) _etext;
  78        kern_size = source_end - source_start;
  79
  80        dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
  81                                            dest_nasid);
  82        memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
  83}
  84
  85void __init replicate_kernel_text()
  86{
  87        cnodeid_t cnode;
  88        nasid_t client_nasid;
  89        nasid_t server_nasid;
  90
  91        server_nasid = master_nasid;
  92
  93        /* Record where the master node should get its kernel text */
  94        set_ktext_source(master_nasid, master_nasid);
  95
  96        for_each_online_node(cnode) {
  97                if (cnode == 0)
  98                        continue;
  99                client_nasid = COMPACT_TO_NASID_NODEID(cnode);
 100
 101                /* Check if this node should get a copy of the kernel */
 102                if (cpu_isset(cnode, ktext_repmask)) {
 103                        server_nasid = client_nasid;
 104                        copy_kernel(server_nasid);
 105                }
 106
 107                /* Record where this node should get its kernel text */
 108                set_ktext_source(client_nasid, server_nasid);
 109        }
 110}
 111
 112/*
 113 * Return pfn of first free page of memory on a node. PROM may allocate
 114 * data structures on the first couple of pages of the first slot of each
 115 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
 116 */
 117unsigned long node_getfirstfree(cnodeid_t cnode)
 118{
 119        unsigned long loadbase = REP_BASE;
 120        nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 121        unsigned long offset;
 122
 123#ifdef CONFIG_MAPPED_KERNEL
 124        loadbase += 16777216;
 125#endif
 126        offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
 127        if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask)))
 128                return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
 129        else
 130                return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
 131                                                                PAGE_SHIFT);
 132}
 133