/* SPDX-License-Identifier: GPL-2.0 */// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #ifndef __ASM_CSKY_PROCESSOR_H#define __ASM_CSKY_PROCESSOR_H #include <linux/bitops.h>#include <asm/segment.h>#include <asm/ptrace.h>#include <asm/current.h>#include <asm/cache.h>#include <abi/reg_ops.h>#include <abi/regdef.h>#include <abi/switch_context.h>#ifdef CONFIG_CPU_HAS_FPU#include <abi/fpu.h>#endif struct cpuinfo_csky {	unsigned long asid_cache;} __aligned(SMP_CACHE_BYTES); extern struct cpuinfo_csky cpu_data[]; /* * User space process size: 2GB. This is hardcoded into a few places, * so don't change it unless you know what you are doing.  TASK_SIZE * for a 64 bit kernel expandable to 8192EB, of which the current CSKY * implementations will "only" be able to use 1TB ... */#define TASK_SIZE       0x7fff8000UL #ifdef __KERNEL__#define STACK_TOP       TASK_SIZE#define STACK_TOP_MAX   STACK_TOP#endif /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3) struct thread_struct {	unsigned long  sp;        /* kernel stack pointer */	unsigned long  trap_no;   /* saved status register */ 	/* FPU regs */	struct user_fp __aligned(16) user_fp;}; #define INIT_THREAD  { \	.sp = sizeof(init_stack) + (unsigned long) &init_stack, \} /* * 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); /* reads from user space */			\	(_regs)->pc = (_pc);						\	(_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */	\	(_regs)->regs[2] = 0;						\	(_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */		\	(_regs)->sr &= ~PS_S;						\	(_regs)->usp = (_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){} /* Prepare to copy thread state - unlazy all lazy status */#define prepare_to_copy(tsk)    do { } while (0) extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 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)->usp) #define task_pt_regs(p) \	((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) #define cpu_relax() barrier() #endif /* __ASM_CSKY_PROCESSOR_H */