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f7e4217b00
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>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
#ifndef __ASM_BFIN_PROCESSOR_H
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#define __ASM_BFIN_PROCESSOR_H
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#include <asm/blackfin.h>
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#include <asm/segment.h>
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#include <linux/compiler.h>
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static inline unsigned long rdusp(void)
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{
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unsigned long usp;
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__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
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return usp;
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}
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static inline void wrusp(unsigned long usp)
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{
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__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
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}
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/*
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* User space process size: 1st byte beyond user address space.
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*/
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extern unsigned long memory_end;
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#define TASK_SIZE (memory_end)
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#define TASK_UNMAPPED_BASE 0
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struct thread_struct {
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unsigned long ksp; /* kernel stack pointer */
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unsigned long usp; /* user stack pointer */
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unsigned short seqstat; /* saved status register */
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unsigned long esp0; /* points to SR of stack frame pt_regs */
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unsigned long pc; /* instruction pointer */
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void * debuggerinfo;
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};
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#define INIT_THREAD { \
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sizeof(init_stack) + (unsigned long) init_stack, 0, \
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PS_S, 0, 0 \
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}
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/*
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* Do necessary setup to start up a newly executed thread.
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*
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* pass the data segment into user programs if it exists,
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* it can't hurt anything as far as I can tell
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*/
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#define start_thread(_regs, _pc, _usp) \
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do { \
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set_fs(USER_DS); \
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(_regs)->pc = (_pc); \
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if (current->mm) \
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(_regs)->p5 = current->mm->start_data; \
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task_thread_info(current)->l1_task_info.stack_start \
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= (void *)current->mm->context.stack_start; \
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task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
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memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
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sizeof(*L1_SCRATCH_TASK_INFO)); \
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wrusp(_usp); \
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} while(0)
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/* Forward declaration, a strange C thing */
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struct task_struct;
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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#define prepare_to_copy(tsk) do { } while (0)
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extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
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/*
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* Free current thread data structures etc..
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*/
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static inline void exit_thread(void)
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{
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}
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/*
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* Return saved PC of a blocked thread.
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*/
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#define thread_saved_pc(tsk) (tsk->thread.pc)
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) \
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({ \
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unsigned long eip = 0; \
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if ((tsk)->thread.esp0 > PAGE_SIZE && \
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MAP_NR((tsk)->thread.esp0) < max_mapnr) \
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eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
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eip; })
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
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#define cpu_relax() barrier()
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/* Get the Silicon Revision of the chip */
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static inline uint32_t bfin_revid(void)
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{
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/* stored in the upper 4 bits */
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return bfin_read_CHIPID() >> 28;
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}
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static inline uint32_t bfin_compiled_revid(void)
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{
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#if defined(CONFIG_BF_REV_0_0)
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return 0;
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#elif defined(CONFIG_BF_REV_0_1)
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return 1;
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#elif defined(CONFIG_BF_REV_0_2)
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return 2;
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#elif defined(CONFIG_BF_REV_0_3)
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return 3;
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#elif defined(CONFIG_BF_REV_0_4)
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return 4;
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#elif defined(CONFIG_BF_REV_0_5)
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return 5;
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#endif
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}
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#endif
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