1/* SPDX-License-Identifier: GPL-2.0 */ 2 3#ifndef __ASM_CSKY_PROCESSOR_H 4#define __ASM_CSKY_PROCESSOR_H 5 6#include <linux/bitops.h> 7#include <asm/segment.h> 8#include <asm/ptrace.h> 9#include <asm/current.h> 10#include <asm/cache.h> 11#include <abi/reg_ops.h> 12#include <abi/regdef.h> 13#include <abi/switch_context.h> 14#ifdef CONFIG_CPU_HAS_FPU 15#include <abi/fpu.h> 16#endif 17 18struct cpuinfo_csky { 19 unsigned long asid_cache; 20} __aligned(SMP_CACHE_BYTES); 21 22extern struct cpuinfo_csky cpu_data[]; 23 24/* 25 * User space process size: 2GB. This is hardcoded into a few places, 26 * so don't change it unless you know what you are doing. TASK_SIZE 27 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY 28 * implementations will "only" be able to use 1TB ... 29 */ 30#define TASK_SIZE (PAGE_OFFSET - (PAGE_SIZE * 8)) 31 32#ifdef __KERNEL__ 33#define STACK_TOP TASK_SIZE 34#define STACK_TOP_MAX STACK_TOP 35#endif 36 37/* This decides where the kernel will search for a free chunk of vm 38 * space during mmap's. 39 */ 40#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 41 42struct thread_struct { 43 unsigned long sp; /* kernel stack pointer */ 44 unsigned long trap_no; /* saved status register */ 45 46 /* FPU regs */ 47 struct user_fp __aligned(16) user_fp; 48}; 49 50#define INIT_THREAD { \ 51 .sp = sizeof(init_stack) + (unsigned long) &init_stack, \ 52} 53 54/* 55 * Do necessary setup to start up a newly executed thread. 56 * 57 * pass the data segment into user programs if it exists, 58 * it can't hurt anything as far as I can tell 59 */ 60#define start_thread(_regs, _pc, _usp) \ 61do { \ 62 set_fs(USER_DS); /* reads from user space */ \ 63 (_regs)->pc = (_pc); \ 64 (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \ 65 (_regs)->regs[2] = 0; \ 66 (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \ 67 (_regs)->sr &= ~PS_S; \ 68 (_regs)->usp = (_usp); \ 69} while (0) 70 71/* Forward declaration, a strange C thing */ 72struct task_struct; 73 74/* Free all resources held by a thread. */ 75static inline void release_thread(struct task_struct *dead_task) 76{ 77} 78 79/* Prepare to copy thread state - unlazy all lazy status */ 80#define prepare_to_copy(tsk) do { } while (0) 81 82extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 83 84unsigned long get_wchan(struct task_struct *p); 85 86#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 87#define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp) 88 89#define task_pt_regs(p) \ 90 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) 91 92#define cpu_relax() barrier() 93 94#endif /* __ASM_CSKY_PROCESSOR_H */ 95