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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 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 ksp; /* kernel stack pointer */ unsigned long sr; /* saved status register */ unsigned long trap_no; /* saved status register */ /* FPU regs */ struct user_fp __aligned(16) user_fp; }; #define INIT_THREAD { \ .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ .sr = DEFAULT_PSR_VALUE, \ } /* * 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); #define copy_segments(tsk, mm) do { } while (0) #define release_segments(mm) do { } while (0) #define forget_segments() do { } while (0) extern unsigned long thread_saved_pc(struct task_struct *tsk); 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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