1 /* SPDX-License-Identifier: GPL-2.0 */ 2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. 3 4 #ifndef __ASM_CSKY_PROCESSOR_H 5 #define __ASM_CSKY_PROCESSOR_H 6 7 /* 8 * Default implementation of macro that returns current 9 * instruction pointer ("program counter"). 10 */ 11 #define current_text_addr() ({ __label__ _l; _l: &&_l; }) 12 13 #include <linux/bitops.h> 14 #include <asm/segment.h> 15 #include <asm/ptrace.h> 16 #include <asm/current.h> 17 #include <asm/cache.h> 18 #include <abi/reg_ops.h> 19 #include <abi/regdef.h> 20 #ifdef CONFIG_CPU_HAS_FPU 21 #include <abi/fpu.h> 22 #endif 23 24 struct cpuinfo_csky { 25 unsigned long udelay_val; 26 unsigned long asid_cache; 27 /* 28 * Capability and feature descriptor structure for CSKY CPU 29 */ 30 unsigned long options; 31 unsigned int processor_id[4]; 32 unsigned int fpu_id; 33 } __aligned(SMP_CACHE_BYTES); 34 35 extern struct cpuinfo_csky cpu_data[]; 36 37 /* 38 * User space process size: 2GB. This is hardcoded into a few places, 39 * so don't change it unless you know what you are doing. TASK_SIZE 40 * for a 64 bit kernel expandable to 8192EB, of which the current CSKY 41 * implementations will "only" be able to use 1TB ... 42 */ 43 #define TASK_SIZE 0x7fff8000UL 44 45 #ifdef __KERNEL__ 46 #define STACK_TOP TASK_SIZE 47 #define STACK_TOP_MAX STACK_TOP 48 #endif 49 50 /* This decides where the kernel will search for a free chunk of vm 51 * space during mmap's. 52 */ 53 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 54 55 struct thread_struct { 56 unsigned long ksp; /* kernel stack pointer */ 57 unsigned long sr; /* saved status register */ 58 unsigned long esp0; /* points to SR of stack frame */ 59 unsigned long hi; 60 unsigned long lo; 61 62 /* Other stuff associated with the thread. */ 63 unsigned long address; /* Last user fault */ 64 unsigned long error_code; 65 66 /* FPU regs */ 67 struct user_fp __aligned(16) user_fp; 68 }; 69 70 #define INIT_THREAD { \ 71 .ksp = (unsigned long) init_thread_union.stack + THREAD_SIZE, \ 72 .sr = DEFAULT_PSR_VALUE, \ 73 } 74 75 /* 76 * Do necessary setup to start up a newly executed thread. 77 * 78 * pass the data segment into user programs if it exists, 79 * it can't hurt anything as far as I can tell 80 */ 81 #define start_thread(_regs, _pc, _usp) \ 82 do { \ 83 set_fs(USER_DS); /* reads from user space */ \ 84 (_regs)->pc = (_pc); \ 85 (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \ 86 (_regs)->regs[2] = 0; \ 87 (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \ 88 (_regs)->sr &= ~PS_S; \ 89 (_regs)->usp = (_usp); \ 90 } while (0) 91 92 /* Forward declaration, a strange C thing */ 93 struct task_struct; 94 95 /* Free all resources held by a thread. */ 96 static inline void release_thread(struct task_struct *dead_task) 97 { 98 } 99 100 /* Prepare to copy thread state - unlazy all lazy status */ 101 #define prepare_to_copy(tsk) do { } while (0) 102 103 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 104 105 #define copy_segments(tsk, mm) do { } while (0) 106 #define release_segments(mm) do { } while (0) 107 #define forget_segments() do { } while (0) 108 109 extern unsigned long thread_saved_pc(struct task_struct *tsk); 110 111 unsigned long get_wchan(struct task_struct *p); 112 113 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 114 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp) 115 116 #define task_pt_regs(p) \ 117 ((struct pt_regs *)(THREAD_SIZE + p->stack) - 1) 118 119 #define cpu_relax() barrier() 120 121 #endif /* __ASM_CSKY_PROCESSOR_H */ 122