projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e9564df7 GR |
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 | ||
| e9564df7 GR |
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> | |
| 789154c2 | 14 | #include <abi/switch_context.h> |
| e9564df7 GR |
15 | #ifdef CONFIG_CPU_HAS_FPU |
| 16 | #include <abi/fpu.h> | |
| 17 | #endif | |
| 18 | ||
| 19 | struct cpuinfo_csky { | |
| e9564df7 | 20 | unsigned long asid_cache; |
| e9564df7 GR |
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 { | |
| 67002814 | 44 | unsigned long sp; /* kernel stack pointer */ |
| 9c0e343d | 45 | unsigned long trap_no; /* saved status register */ |
| e9564df7 GR |
46 | |
| 47 | /* FPU regs */ | |
| 48 | struct user_fp __aligned(16) user_fp; | |
| 49 | }; | |
| 50 | ||
| 51 | #define INIT_THREAD { \ | |
| 67002814 | 52 | .sp = sizeof(init_stack) + (unsigned long) &init_stack, \ |
| e9564df7 GR |
53 | } |
| 54 | ||
| 55 | /* | |
| 56 | * Do necessary setup to start up a newly executed thread. | |
| 57 | * | |
| 58 | * pass the data segment into user programs if it exists, | |
| 59 | * it can't hurt anything as far as I can tell | |
| 60 | */ | |
| 61 | #define start_thread(_regs, _pc, _usp) \ | |
| 62 | do { \ | |
| 63 | set_fs(USER_DS); /* reads from user space */ \ | |
| 64 | (_regs)->pc = (_pc); \ | |
| 65 | (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \ | |
| 66 | (_regs)->regs[2] = 0; \ | |
| 67 | (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \ | |
| 68 | (_regs)->sr &= ~PS_S; \ | |
| 69 | (_regs)->usp = (_usp); \ | |
| 70 | } while (0) | |
| 71 | ||
| 72 | /* Forward declaration, a strange C thing */ | |
| 73 | struct task_struct; | |
| 74 | ||
| 75 | /* Free all resources held by a thread. */ | |
| 76 | static inline void release_thread(struct task_struct *dead_task) | |
| 77 | { | |
| 78 | } | |
| 79 | ||
| 80 | /* Prepare to copy thread state - unlazy all lazy status */ | |
| 81 | #define prepare_to_copy(tsk) do { } while (0) | |
| 82 | ||
| 83 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
| 84 | ||
| 85 | #define copy_segments(tsk, mm) do { } while (0) | |
| 86 | #define release_segments(mm) do { } while (0) | |
| 87 | #define forget_segments() do { } while (0) | |
| 88 | ||
| 89 | extern unsigned long thread_saved_pc(struct task_struct *tsk); | |
| 90 | ||
| 91 | unsigned long get_wchan(struct task_struct *p); | |
| 92 | ||
| 93 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) | |
| 94 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp) | |
| 95 | ||
| 96 | #define task_pt_regs(p) \ | |
| 0f231dcf | 97 | ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) |
| e9564df7 GR |
98 | |
| 99 | #define cpu_relax() barrier() | |
| 100 | ||
| 101 | #endif /* __ASM_CSKY_PROCESSOR_H */ |