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/mmzone.h>
   8 #include <linux/kernel.h>
   9 #include <linux/nodemask.h>
  10 #include <linux/string.h>
  11
  12 #include <asm/page.h>
  13 #include <asm/sections.h>
  14 #include <asm/sn/types.h>
  15 #include <asm/sn/arch.h>
  16 #include <asm/sn/gda.h>
  17 #include <asm/sn/hub.h>
  18 #include <asm/sn/mapped_kernel.h>
  19 #include <asm/sn/sn_private.h>
  20
  21 static cpumask_t ktext_repmask;
  22
  23 /*
  24  * XXX - This needs to be much smarter about where it puts copies of the
  25  * kernel.  For example, we should never put a copy on a headless node,
  26  * and we should respect the topology of the machine.
  27  */
  28 void __init setup_replication_mask(void)
  29 {
  30         /* Set only the master cnode's bit.  The master cnode is always 0. */
  31         cpus_clear(ktext_repmask);
  32         cpu_set(0, ktext_repmask);
  33
  34 #ifdef CONFIG_REPLICATE_KTEXT
  35 #ifndef CONFIG_MAPPED_KERNEL
  36 #error Kernel replication works with mapped kernel support. No calias support.
  37 #endif
  38         {
  39                 cnodeid_t       cnode;
  40
  41                 for_each_online_node(cnode) {
  42                         if (cnode == 0)
  43                                 continue;
  44                         /* Advertise that we have a copy of the kernel */
  45                         cpu_set(cnode, ktext_repmask);
  46                 }
  47         }
  48 #endif
  49         /* Set up a GDA pointer to the replication mask. */
  50         GDA->g_ktext_repmask = &ktext_repmask;
  51 }
  52
  53
  54 static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
  55 {
  56         cnodeid_t client_cnode;
  57         kern_vars_t *kvp;
  58
  59         client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);
  60
  61         kvp = &hub_data(client_nasid)->kern_vars;
  62
  63         KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
  64
  65         kvp->kv_magic = KV_MAGIC;
  66         kvp->kv_ro_nasid = server_nasid;
  67         kvp->kv_rw_nasid = master_nasid;
  68         kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
  69         kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
  70         printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
  71 }
  72
  73 /* XXX - When the BTE works, we should use it instead of this. */
  74 static __init void copy_kernel(nasid_t dest_nasid)
  75 {
  76         unsigned long dest_kern_start, source_start, source_end, kern_size;
  77
  78         source_start = (unsigned long) _stext;
  79         source_end = (unsigned long) _etext;
  80         kern_size = source_end - source_start;
  81
  82         dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
  83                                             dest_nasid);
  84         memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
  85 }
  86
  87 void __init replicate_kernel_text()
  88 {
  89         cnodeid_t cnode;
  90         nasid_t client_nasid;
  91         nasid_t server_nasid;
  92
  93         server_nasid = master_nasid;
  94
  95         /* Record where the master node should get its kernel text */
  96         set_ktext_source(master_nasid, master_nasid);
  97
  98         for_each_online_node(cnode) {
  99                 if (cnode == 0)
 100                         continue;
 101                 client_nasid = COMPACT_TO_NASID_NODEID(cnode);
 102
 103                 /* Check if this node should get a copy of the kernel */
 104                 if (cpu_isset(cnode, ktext_repmask)) {
 105                         server_nasid = client_nasid;
 106                         copy_kernel(server_nasid);
 107                 }
 108
 109                 /* Record where this node should get its kernel text */
 110                 set_ktext_source(client_nasid, server_nasid);
 111         }
 112 }
 113
 114 /*
 115  * Return pfn of first free page of memory on a node. PROM may allocate
 116  * data structures on the first couple of pages of the first slot of each
 117  * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
 118  */
 119 pfn_t node_getfirstfree(cnodeid_t cnode)
 120 {
 121         unsigned long loadbase = REP_BASE;
 122         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
 123         unsigned long offset;
 124
 125 #ifdef CONFIG_MAPPED_KERNEL
 126         loadbase += 16777216;
 127 #endif
 128         offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
 129         if ((cnode == 0) || (cpu_isset(cnode, ktext_repmask)))
 130                 return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
 131         else
 132                 return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
 133                                                                 PAGE_SHIFT);
 134 }
 135