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/*
* Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
* Copyright 2000 Silicon Graphics, Inc.
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/mmzone.h>
#include <linux/kernel.h>
#include <asm/sn/types.h>
#include <asm/sn/arch.h>
#include <asm/sn/gda.h>
#include <asm/mmzone.h>
#include <asm/sn/klkernvars.h>
#include <asm/sn/mapped_kernel.h>
#include <asm/sn/sn_private.h>
#define CPUMASK_CLRALL(p) (p) = 0
#define CPUMASK_SETB(p, bit) (p) |= 1 << (bit)
#define CPUMASK_TSTB(p, bit) ((p) & (1ULL << (bit)))
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(int maxnodes)
{
static int numa_kernel_replication_ratio;
cnodeid_t cnode;
/* Set only the master cnode's bit. The master cnode is always 0. */
CPUMASK_CLRALL(ktext_repmask);
CPUMASK_SETB(ktext_repmask, 0);
numa_kernel_replication_ratio = 0;
#ifdef CONFIG_REPLICATE_KTEXT
#ifndef CONFIG_MAPPED_KERNEL
#error Kernel replication works with mapped kernel support. No calias support.
#endif
numa_kernel_replication_ratio = 1;
#endif
for (cnode = 1; cnode < numnodes; cnode++) {
/* See if this node should get a copy of the kernel */
if (numa_kernel_replication_ratio &&
!(cnode % numa_kernel_replication_ratio)) {
/* Advertise that we have a copy of the kernel */
CPUMASK_SETB(ktext_repmask, cnode);
}
}
/* 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;
cnodeid_t client_cnode;
client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);
kvp = &(PLAT_NODE_DATA(client_cnode)->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)
{
extern char _stext, _etext;
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(int maxnodes)
{
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 (cnode = 1; cnode < maxnodes; cnode++) {
client_nasid = COMPACT_TO_NASID_NODEID(cnode);
/* Check if this node should get a copy of the kernel */
if (CPUMASK_TSTB(ktext_repmask, cnode)) {
server_nasid = client_nasid;
copy_kernel(server_nasid);
}
/* Record where this node should get its kernel text */
set_ktext_source(client_nasid, server_nasid);
}
}
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