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