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 18 struct cpuinfo_csky { 19 unsigned long asid_cache; 20 } __aligned(SMP_CACHE_BYTES); 21 22 extern 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 42 struct 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) \ 61 do { \ 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 */ 72 struct task_struct; 73 74 /* Free all resources held by a thread. */ 75 static 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 82 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 83 84 unsigned 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