| /* 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 */ |
| |
| /* 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 */ |