be44d2aabc
Clean up the espfix code: - Introduced PER_CPU() macro to be used from asm - Introduced GET_DESC_BASE() macro to be used from asm - Rewrote the fixup code in asm, as calling a C code with the altered %ss appeared to be unsafe - No longer altering the stack from a .fixup section - 16bit per-cpu stack is no longer used, instead the stack segment base is patched the way so that the high word of the kernel and user %esp are the same. - Added the limit-patching for the espfix segment. (Chuck Ebbert) [jeremy@goop.org: use the x86 scaling addressing mode rather than shifting] Signed-off-by: Stas Sergeev <stsp@aknet.ru> Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: Zachary Amsden <zach@vmware.com> Acked-by: Chuck Ebbert <76306.1226@compuserve.com> Acked-by: Jan Beulich <jbeulich@novell.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@osdl.org>
32 lines
658 B
C
32 lines
658 B
C
#ifndef __ARCH_I386_PERCPU__
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#define __ARCH_I386_PERCPU__
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#ifndef __ASSEMBLY__
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#include <asm-generic/percpu.h>
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#else
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/*
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* PER_CPU finds an address of a per-cpu variable.
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*
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* Args:
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* var - variable name
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* cpu - 32bit register containing the current CPU number
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*
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* The resulting address is stored in the "cpu" argument.
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*
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* Example:
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* PER_CPU(cpu_gdt_descr, %ebx)
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*/
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#ifdef CONFIG_SMP
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#define PER_CPU(var, cpu) \
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movl __per_cpu_offset(,cpu,4), cpu; \
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addl $per_cpu__/**/var, cpu;
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#else /* ! SMP */
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#define PER_CPU(var, cpu) \
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movl $per_cpu__/**/var, cpu;
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#endif /* SMP */
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#endif /* !__ASSEMBLY__ */
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#endif /* __ARCH_I386_PERCPU__ */
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