mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 14:16:53 +07:00
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__
|
|
#define __ARCH_I386_PERCPU__
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm-generic/percpu.h>
|
|
#else
|
|
|
|
/*
|
|
* PER_CPU finds an address of a per-cpu variable.
|
|
*
|
|
* Args:
|
|
* var - variable name
|
|
* cpu - 32bit register containing the current CPU number
|
|
*
|
|
* The resulting address is stored in the "cpu" argument.
|
|
*
|
|
* Example:
|
|
* PER_CPU(cpu_gdt_descr, %ebx)
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define PER_CPU(var, cpu) \
|
|
movl __per_cpu_offset(,cpu,4), cpu; \
|
|
addl $per_cpu__/**/var, cpu;
|
|
#else /* ! SMP */
|
|
#define PER_CPU(var, cpu) \
|
|
movl $per_cpu__/**/var, cpu;
|
|
#endif /* SMP */
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* __ARCH_I386_PERCPU__ */
|