linux/arch/sh/include/asm/processor_32.h
Kefeng Wang 2be9880dc8 kernel: exit: cleanup release_thread()
Only x86 has own release_thread(), introduce a new weak release_thread()
function to clean empty definitions in other ARCHs.

Link: https://lkml.kernel.org/r/20220819014406.32266-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Guo Ren <guoren@kernel.org>				[csky]
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Brian Cain <bcain@quicinc.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>			[powerpc]
Acked-by: Stafford Horne <shorne@gmail.com>			[openrisc]
Acked-by: Catalin Marinas <catalin.marinas@arm.com>		[arm64]
Acked-by: Huacai Chen <chenhuacai@kernel.org>			[LoongArch]
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Chris Zankel <chris@zankel.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Guo Ren <guoren@kernel.org> [csky]
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Xuerui Wang <kernel@xen0n.name>
Cc: Yoshinori Sato <ysato@users.osdn.me>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-09-11 21:55:07 -07:00

203 lines
4.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* include/asm-sh/processor.h
*
* Copyright (C) 1999, 2000 Niibe Yutaka
* Copyright (C) 2002, 2003 Paul Mundt
*/
#ifndef __ASM_SH_PROCESSOR_32_H
#define __ASM_SH_PROCESSOR_32_H
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/types.h>
#include <asm/hw_breakpoint.h>
/* Core Processor Version Register */
#define CCN_PVR 0xff000030
#define CCN_CVR 0xff000040
#define CCN_PRR 0xff000044
/*
* User space process size: 2GB.
*
* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
*/
#define TASK_SIZE 0x7c000000UL
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX STACK_TOP
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
/*
* Bit of SR register
*
* FD-bit:
* When it's set, it means the processor doesn't have right to use FPU,
* and it results exception when the floating operation is executed.
*
* IMASK-bit:
* Interrupt level mask
*/
#define SR_DSP 0x00001000
#define SR_IMASK 0x000000f0
#define SR_FD 0x00008000
#define SR_MD 0x40000000
/*
* DSP structure and data
*/
struct sh_dsp_struct {
unsigned long dsp_regs[14];
long status;
};
/*
* FPU structure and data
*/
struct sh_fpu_hard_struct {
unsigned long fp_regs[16];
unsigned long xfp_regs[16];
unsigned long fpscr;
unsigned long fpul;
long status; /* software status information */
};
/* Dummy fpu emulator */
struct sh_fpu_soft_struct {
unsigned long fp_regs[16];
unsigned long xfp_regs[16];
unsigned long fpscr;
unsigned long fpul;
unsigned char lookahead;
unsigned long entry_pc;
};
union thread_xstate {
struct sh_fpu_hard_struct hardfpu;
struct sh_fpu_soft_struct softfpu;
};
struct thread_struct {
/* Saved registers when thread is descheduled */
unsigned long sp;
unsigned long pc;
/* Various thread flags, see SH_THREAD_xxx */
unsigned long flags;
/* Save middle states of ptrace breakpoints */
struct perf_event *ptrace_bps[HBP_NUM];
#ifdef CONFIG_SH_DSP
/* Dsp status information */
struct sh_dsp_struct dsp_status;
#endif
/* Extended processor state */
union thread_xstate *xstate;
/*
* fpu_counter contains the number of consecutive context switches
* that the FPU is used. If this is over a threshold, the lazy fpu
* saving becomes unlazy to save the trap. This is an unsigned char
* so that after 256 times the counter wraps and the behavior turns
* lazy again; this to deal with bursty apps that only use FPU for
* a short time
*/
unsigned char fpu_counter;
};
#define INIT_THREAD { \
.sp = sizeof(init_stack) + (long) &init_stack, \
.flags = 0, \
}
/* Forward declaration, a strange C thing */
struct task_struct;
extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
/*
* FPU lazy state save handling.
*/
static __inline__ void disable_fpu(void)
{
unsigned long __dummy;
/* Set FD flag in SR */
__asm__ __volatile__("stc sr, %0\n\t"
"or %1, %0\n\t"
"ldc %0, sr"
: "=&r" (__dummy)
: "r" (SR_FD));
}
static __inline__ void enable_fpu(void)
{
unsigned long __dummy;
/* Clear out FD flag in SR */
__asm__ __volatile__("stc sr, %0\n\t"
"and %1, %0\n\t"
"ldc %0, sr"
: "=&r" (__dummy)
: "r" (~SR_FD));
}
/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
#define FPSCR_INIT 0x00080000
#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
/*
* Return saved PC of a blocked thread.
*/
#define thread_saved_pc(tsk) (tsk->thread.pc)
void show_trace(struct task_struct *tsk, unsigned long *sp,
struct pt_regs *regs, const char *loglvl);
#ifdef CONFIG_DUMP_CODE
void show_code(struct pt_regs *regs);
#else
static inline void show_code(struct pt_regs *regs)
{
}
#endif
extern unsigned long __get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
#define PREFETCH_STRIDE L1_CACHE_BYTES
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
static inline void prefetch(const void *x)
{
__builtin_prefetch(x, 0, 3);
}
static inline void prefetchw(const void *x)
{
__builtin_prefetch(x, 1, 3);
}
#endif
#endif /* __ASM_SH_PROCESSOR_32_H */