linux/include/asm-blackfin/processor.h
Roman Zippel f7e4217b00 rename thread_info to stack
This finally renames the thread_info field in task structure to stack, so that
the assumptions about this field are gone and archs have more freedom about
placing the thread_info structure.

Nonbroken archs which have a proper thread pointer can do the access to both
current thread and task structure via a single pointer.

It'll allow for a few more cleanups of the fork code, from which e.g.  ia64
could benefit.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
[akpm@linux-foundation.org: build fix]
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Andi Kleen <ak@muc.de>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-09 12:30:56 -07:00

131 lines
3.1 KiB
C

#ifndef __ASM_BFIN_PROCESSOR_H
#define __ASM_BFIN_PROCESSOR_H
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
#include <asm/blackfin.h>
#include <asm/segment.h>
#include <linux/compiler.h>
static inline unsigned long rdusp(void)
{
unsigned long usp;
__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
return usp;
}
static inline void wrusp(unsigned long usp)
{
__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
}
/*
* User space process size: 1st byte beyond user address space.
*/
extern unsigned long memory_end;
#define TASK_SIZE (memory_end)
#define TASK_UNMAPPED_BASE 0
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
unsigned long usp; /* user stack pointer */
unsigned short seqstat; /* saved status register */
unsigned long esp0; /* points to SR of stack frame pt_regs */
unsigned long pc; /* instruction pointer */
void * debuggerinfo;
};
#define INIT_THREAD { \
sizeof(init_stack) + (unsigned long) init_stack, 0, \
PS_S, 0, 0 \
}
/*
* Do necessary setup to start up a newly executed thread.
*
* pass the data segment into user programs if it exists,
* it can't hurt anything as far as I can tell
*/
#define start_thread(_regs, _pc, _usp) \
do { \
set_fs(USER_DS); \
(_regs)->pc = (_pc); \
if (current->mm) \
(_regs)->p5 = current->mm->start_data; \
task_thread_info(current)->l1_task_info.stack_start \
= (void *)current->mm->context.stack_start; \
task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
sizeof(*L1_SCRATCH_TASK_INFO)); \
wrusp(_usp); \
} while(0)
/* Forward declaration, a strange C thing */
struct task_struct;
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}
#define prepare_to_copy(tsk) do { } while (0)
extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
/*
* Free current thread data structures etc..
*/
static inline void exit_thread(void)
{
}
/*
* Return saved PC of a blocked thread.
*/
#define thread_saved_pc(tsk) (tsk->thread.pc)
unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) \
({ \
unsigned long eip = 0; \
if ((tsk)->thread.esp0 > PAGE_SIZE && \
MAP_NR((tsk)->thread.esp0) < max_mapnr) \
eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
eip; })
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
#define cpu_relax() barrier()
/* Get the Silicon Revision of the chip */
static inline uint32_t bfin_revid(void)
{
/* stored in the upper 4 bits */
return bfin_read_CHIPID() >> 28;
}
static inline uint32_t bfin_compiled_revid(void)
{
#if defined(CONFIG_BF_REV_0_0)
return 0;
#elif defined(CONFIG_BF_REV_0_1)
return 1;
#elif defined(CONFIG_BF_REV_0_2)
return 2;
#elif defined(CONFIG_BF_REV_0_3)
return 3;
#elif defined(CONFIG_BF_REV_0_4)
return 4;
#elif defined(CONFIG_BF_REV_0_5)
return 5;
#endif
}
#endif