| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | #include <linux/bitops.h> |
| 8 | #include <asm/segment.h> |
| 9 | #include <asm/ptrace.h> |
| 10 | #include <asm/current.h> |
| 11 | #include <asm/cache.h> |
| 12 | #include <abi/reg_ops.h> |
| 13 | #include <abi/regdef.h> |
| 14 | #include <abi/switch_context.h> |
| 15 | #ifdef CONFIG_CPU_HAS_FPU |
| 16 | #include <abi/fpu.h> |
| 17 | #endif |
| 18 | |
| 19 | struct cpuinfo_csky { |
| 20 | unsigned long asid_cache; |
| 21 | } __aligned(SMP_CACHE_BYTES); |
| 22 | |
| 23 | extern struct cpuinfo_csky cpu_data[]; |
| 24 | |
| 25 | /* |
| 26 | * User space process size: 2GB. This is hardcoded into a few places, |
| 27 | * so don't change it unless you know what you are doing. TASK_SIZE |
| 28 | * for a 64 bit kernel expandable to 8192EB, of which the current CSKY |
| 29 | * implementations will "only" be able to use 1TB ... |
| 30 | */ |
| 31 | #define TASK_SIZE 0x7fff8000UL |
| 32 | |
| 33 | #ifdef __KERNEL__ |
| 34 | #define STACK_TOP TASK_SIZE |
| 35 | #define STACK_TOP_MAX STACK_TOP |
| 36 | #endif |
| 37 | |
| 38 | /* This decides where the kernel will search for a free chunk of vm |
| 39 | * space during mmap's. |
| 40 | */ |
| 41 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) |
| 42 | |
| 43 | struct thread_struct { |
| 44 | unsigned long ksp; /* kernel stack pointer */ |
| 45 | unsigned long sr; /* saved status register */ |
| 46 | unsigned long trap_no; /* saved status register */ |
| 47 | |
| 48 | /* FPU regs */ |
| 49 | struct user_fp __aligned(16) user_fp; |
| 50 | }; |
| 51 | |
| 52 | #define INIT_THREAD { \ |
| 53 | .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ |
| 54 | .sr = DEFAULT_PSR_VALUE, \ |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Do necessary setup to start up a newly executed thread. |
| 59 | * |
| 60 | * pass the data segment into user programs if it exists, |
| 61 | * it can't hurt anything as far as I can tell |
| 62 | */ |
| 63 | #define start_thread(_regs, _pc, _usp) \ |
| 64 | do { \ |
| 65 | set_fs(USER_DS); /* reads from user space */ \ |
| 66 | (_regs)->pc = (_pc); \ |
| 67 | (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \ |
| 68 | (_regs)->regs[2] = 0; \ |
| 69 | (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \ |
| 70 | (_regs)->sr &= ~PS_S; \ |
| 71 | (_regs)->usp = (_usp); \ |
| 72 | } while (0) |
| 73 | |
| 74 | /* Forward declaration, a strange C thing */ |
| 75 | struct task_struct; |
| 76 | |
| 77 | /* Free all resources held by a thread. */ |
| 78 | static inline void release_thread(struct task_struct *dead_task) |
| 79 | { |
| 80 | } |
| 81 | |
| 82 | /* Prepare to copy thread state - unlazy all lazy status */ |
| 83 | #define prepare_to_copy(tsk) do { } while (0) |
| 84 | |
| 85 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
| 86 | |
| 87 | #define copy_segments(tsk, mm) do { } while (0) |
| 88 | #define release_segments(mm) do { } while (0) |
| 89 | #define forget_segments() do { } while (0) |
| 90 | |
| 91 | extern unsigned long thread_saved_pc(struct task_struct *tsk); |
| 92 | |
| 93 | unsigned long get_wchan(struct task_struct *p); |
| 94 | |
| 95 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) |
| 96 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp) |
| 97 | |
| 98 | #define task_pt_regs(p) \ |
| 99 | ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) |
| 100 | |
| 101 | #define cpu_relax() barrier() |
| 102 | |
| 103 | #endif /* __ASM_CSKY_PROCESSOR_H */ |