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Viewing changes to arch/x86/mm/setup_nx.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-04kado7d1u2er2rl
Tags: 3.2.0-16.25
Add new lowlatency kernel flavour

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arch/x86/mm/setup_nx.c
 
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <asm/pgtable.h>
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#include <asm/proto.h>
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static int disable_nx __cpuinitdata;
 
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int disable_nx __cpuinitdata;
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/*
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 * noexec = on|off
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void __init x86_report_nx(void)
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{
 
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        int nx_emulation = 0;
 
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        if (!cpu_has_nx) {
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                printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
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                       "missing in CPU!\n");
 
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                nx_emulation = 1;
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        } else {
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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
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                if (disable_nx) {
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#else
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                /* 32bit non-PAE kernel, NX cannot be used */
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                printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
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                       "cannot be enabled: non-PAE kernel!\n");
 
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                       "cannot be enabled in hardware: non-PAE kernel!\n");
 
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                nx_emulation = 1;
 
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#endif
 
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        }
 
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        if (nx_emulation) {
 
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#ifdef CONFIG_X86_32
 
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                if (!disable_nx)
 
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                        printk(KERN_INFO "NX (Execute Disable) protection: "
 
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                               "approximated by x86 segment limits\n");
 
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                else
 
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                        printk(KERN_INFO "NX (Execute Disable) protection: "
 
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                               "approximation disabled by kernel command "
 
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                               "line option\n");
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#endif
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        }
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}