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https://github.com/torvalds/linux
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4b0f3b81eb
It is possible for x86_64 systems to lack the NX bit either due to the hardware lacking support or the BIOS having turned off the CPU capability, so NX status should be reported. Additionally, anyone booting NX-capable CPUs in 32bit mode without PAE will lack NX functionality, so this change provides feedback for that case as well. Signed-off-by: Kees Cook <kees.cook@canonical.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> LKML-Reference: <1258154897-6770-6-git-send-email-hpa@zytor.com>
37 lines
952 B
C
37 lines
952 B
C
#ifndef _ASM_X86_PROTO_H
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#define _ASM_X86_PROTO_H
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#include <asm/ldt.h>
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/* misc architecture specific prototypes */
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extern void early_idt_handler(void);
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extern void system_call(void);
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extern void syscall_init(void);
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extern void ia32_syscall(void);
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extern void ia32_cstar_target(void);
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extern void ia32_sysenter_target(void);
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extern void syscall32_cpu_init(void);
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extern void x86_configure_nx(void);
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extern void x86_report_nx(void);
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extern int reboot_force;
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long do_arch_prctl(struct task_struct *task, int code, unsigned long addr);
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/*
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* This looks more complex than it should be. But we need to
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* get the type for the ~ right in round_down (it needs to be
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* as wide as the result!), and we want to evaluate the macro
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* arguments just once each.
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*/
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#define __round_mask(x,y) ((__typeof__(x))((y)-1))
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#define round_up(x,y) ((((x)-1) | __round_mask(x,y))+1)
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#define round_down(x,y) ((x) & ~__round_mask(x,y))
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#endif /* _ASM_X86_PROTO_H */
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