dd17c8f729
Now that the return from alloc_percpu is compatible with the address
of per-cpu vars, it makes sense to hand around the address of per-cpu
variables. To make this sane, we remove the per_cpu__ prefix we used
created to stop people accidentally using these vars directly.
Now we have sparse, we can use that (next patch).
tj: * Updated to convert stuff which were missed by or added after the
original patch.
* Kill per_cpu_var() macro.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/*
|
|
* Definitions used by low-level trap handlers
|
|
*
|
|
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2007-2009 PetaLogix
|
|
* Copyright (C) 2007 John Williams <john.williams@petalogix.com>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*/
|
|
|
|
#ifndef _ASM_MICROBLAZE_ENTRY_H
|
|
#define _ASM_MICROBLAZE_ENTRY_H
|
|
|
|
#include <asm/percpu.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
/*
|
|
* These are per-cpu variables required in entry.S, among other
|
|
* places
|
|
*/
|
|
|
|
#define PER_CPU(var) var
|
|
|
|
# ifndef __ASSEMBLY__
|
|
DECLARE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
|
|
DECLARE_PER_CPU(unsigned int, KM); /* Kernel/user mode */
|
|
DECLARE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
|
|
DECLARE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
|
|
DECLARE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */
|
|
# endif /* __ASSEMBLY__ */
|
|
|
|
#ifndef CONFIG_MMU
|
|
|
|
/* noMMU hasn't any space for args */
|
|
# define STATE_SAVE_ARG_SPACE (0)
|
|
|
|
#else /* CONFIG_MMU */
|
|
|
|
/* If true, system calls save and restore all registers (except result
|
|
* registers, of course). If false, then `call clobbered' registers
|
|
* will not be preserved, on the theory that system calls are basically
|
|
* function calls anyway, and the caller should be able to deal with it.
|
|
* This is a security risk, of course, as `internal' values may leak out
|
|
* after a system call, but that certainly doesn't matter very much for
|
|
* a processor with no MMU protection! For a protected-mode kernel, it
|
|
* would be faster to just zero those registers before returning.
|
|
*
|
|
* I can not rely on the glibc implementation. If you turn it off make
|
|
* sure that r11/r12 is saved in user-space. --KAA
|
|
*
|
|
* These are special variables using by the kernel trap/interrupt code
|
|
* to save registers in, at a time when there are no spare registers we
|
|
* can use to do so, and we can't depend on the value of the stack
|
|
* pointer. This means that they must be within a signed 16-bit
|
|
* displacement of 0x00000000.
|
|
*/
|
|
|
|
/* A `state save frame' is a struct pt_regs preceded by some extra space
|
|
* suitable for a function call stack frame. */
|
|
|
|
/* Amount of room on the stack reserved for arguments and to satisfy the
|
|
* C calling conventions, in addition to the space used by the struct
|
|
* pt_regs that actually holds saved values. */
|
|
#define STATE_SAVE_ARG_SPACE (6*4) /* Up to six arguments */
|
|
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#endif /* _ASM_MICROBLAZE_ENTRY_H */
|