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