cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ip27-klnuma.c (3611B)


      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
      4 * Copyright 2000 - 2001 Silicon Graphics, Inc.
      5 * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com)
      6 */
      7#include <linux/init.h>
      8#include <linux/mm.h>
      9#include <linux/mmzone.h>
     10#include <linux/kernel.h>
     11#include <linux/nodemask.h>
     12#include <linux/string.h>
     13
     14#include <asm/page.h>
     15#include <asm/sections.h>
     16#include <asm/sn/types.h>
     17#include <asm/sn/arch.h>
     18#include <asm/sn/gda.h>
     19#include <asm/sn/mapped_kernel.h>
     20
     21#include "ip27-common.h"
     22
     23static nodemask_t ktext_repmask;
     24
     25/*
     26 * XXX - This needs to be much smarter about where it puts copies of the
     27 * kernel.  For example, we should never put a copy on a headless node,
     28 * and we should respect the topology of the machine.
     29 */
     30void __init setup_replication_mask(void)
     31{
     32	/* Set only the master cnode's bit.  The master cnode is always 0. */
     33	nodes_clear(ktext_repmask);
     34	node_set(0, ktext_repmask);
     35
     36#ifdef CONFIG_REPLICATE_KTEXT
     37#ifndef CONFIG_MAPPED_KERNEL
     38#error Kernel replication works with mapped kernel support. No calias support.
     39#endif
     40	{
     41		nasid_t nasid;
     42
     43		for_each_online_node(nasid) {
     44			if (nasid == 0)
     45				continue;
     46			/* Advertise that we have a copy of the kernel */
     47			node_set(nasid, ktext_repmask);
     48		}
     49	}
     50#endif
     51	/* Set up a GDA pointer to the replication mask. */
     52	GDA->g_ktext_repmask = &ktext_repmask;
     53}
     54
     55
     56static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
     57{
     58	kern_vars_t *kvp;
     59
     60	kvp = &hub_data(client_nasid)->kern_vars;
     61
     62	KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
     63
     64	kvp->kv_magic = KV_MAGIC;
     65	kvp->kv_ro_nasid = server_nasid;
     66	kvp->kv_rw_nasid = master_nasid;
     67	kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
     68	kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
     69	printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
     70}
     71
     72/* XXX - When the BTE works, we should use it instead of this. */
     73static __init void copy_kernel(nasid_t dest_nasid)
     74{
     75	unsigned long dest_kern_start, source_start, source_end, kern_size;
     76
     77	source_start = (unsigned long) _stext;
     78	source_end = (unsigned long) _etext;
     79	kern_size = source_end - source_start;
     80
     81	dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
     82					    dest_nasid);
     83	memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
     84}
     85
     86void __init replicate_kernel_text(void)
     87{
     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(client_nasid) {
     97		if (client_nasid == 0)
     98			continue;
     99
    100		/* Check if this node should get a copy of the kernel */
    101		if (node_isset(client_nasid, ktext_repmask)) {
    102			server_nasid = client_nasid;
    103			copy_kernel(server_nasid);
    104		}
    105
    106		/* Record where this node should get its kernel text */
    107		set_ktext_source(client_nasid, server_nasid);
    108	}
    109}
    110
    111/*
    112 * Return pfn of first free page of memory on a node. PROM may allocate
    113 * data structures on the first couple of pages of the first slot of each
    114 * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
    115 */
    116unsigned long node_getfirstfree(nasid_t nasid)
    117{
    118	unsigned long loadbase = REP_BASE;
    119	unsigned long offset;
    120
    121#ifdef CONFIG_MAPPED_KERNEL
    122	loadbase += 16777216;
    123#endif
    124	offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
    125	if ((nasid == 0) || (node_isset(nasid, ktext_repmask)))
    126		return TO_NODE(nasid, offset) >> PAGE_SHIFT;
    127	else
    128		return KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT;
    129}