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
  22 static 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  */
  29 void __init setup_replication_mask(void)
  30 {
  31         /* Set only the master cnode's bit.  The master cnode is always 0. */
  32         cpumask_clear(&ktext_repmask);
  33         cpumask_set_cpu(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                         cpumask_set_cpu(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
  55 static __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. */
  72 static __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
  85 void __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 (cpumask_test_cpu(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  */
 117 unsigned 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) || (cpumask_test_cpu(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))) >> PAGE_SHIFT;
 131 }