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/* 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 (PAGE_OFFSET - (PAGE_SIZE * 8))
#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 */
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