| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_M68K_THREAD_INFO_H |
| 3 | #define _ASM_M68K_THREAD_INFO_H |
| 4 | |
| 5 | #include <asm/types.h> |
| 6 | #include <asm/page.h> |
| 7 | #include <asm/segment.h> |
| 8 | |
| 9 | /* |
| 10 | * On machines with 4k pages we default to an 8k thread size, though we |
| 11 | * allow a 4k with config option. Any other machine page size then |
| 12 | * the thread size must match the page size (which is 8k and larger here). |
| 13 | */ |
| 14 | #if PAGE_SHIFT < 13 |
| 15 | #ifdef CONFIG_4KSTACKS |
| 16 | #define THREAD_SIZE 4096 |
| 17 | #else |
| 18 | #define THREAD_SIZE 8192 |
| 19 | #endif |
| 20 | #else |
| 21 | #define THREAD_SIZE PAGE_SIZE |
| 22 | #endif |
| 23 | #define THREAD_SIZE_ORDER ((THREAD_SIZE / PAGE_SIZE) - 1) |
| 24 | |
| 25 | #ifndef __ASSEMBLY__ |
| 26 | |
| 27 | struct thread_info { |
| 28 | struct task_struct *task; /* main task structure */ |
| 29 | unsigned long flags; |
| 30 | mm_segment_t addr_limit; /* thread address space */ |
| 31 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
| 32 | __u32 cpu; /* should always be 0 on m68k */ |
| 33 | unsigned long tp_value; /* thread pointer */ |
| 34 | }; |
| 35 | #endif /* __ASSEMBLY__ */ |
| 36 | |
| 37 | #define INIT_THREAD_INFO(tsk) \ |
| 38 | { \ |
| 39 | .task = &tsk, \ |
| 40 | .addr_limit = KERNEL_DS, \ |
| 41 | .preempt_count = INIT_PREEMPT_COUNT, \ |
| 42 | } |
| 43 | |
| 44 | #ifndef __ASSEMBLY__ |
| 45 | /* how to get the thread information struct from C */ |
| 46 | static inline struct thread_info *current_thread_info(void) |
| 47 | { |
| 48 | struct thread_info *ti; |
| 49 | __asm__( |
| 50 | "move.l %%sp, %0 \n\t" |
| 51 | "and.l %1, %0" |
| 52 | : "=&d"(ti) |
| 53 | : "di" (~(THREAD_SIZE-1)) |
| 54 | ); |
| 55 | return ti; |
| 56 | } |
| 57 | #endif |
| 58 | |
| 59 | /* entry.S relies on these definitions! |
| 60 | * bits 0-7 are tested at every exception exit |
| 61 | * bits 8-15 are also tested at syscall exit |
| 62 | */ |
| 63 | #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ |
| 64 | #define TIF_SIGPENDING 6 /* signal pending */ |
| 65 | #define TIF_NEED_RESCHED 7 /* rescheduling necessary */ |
| 66 | #define TIF_DELAYED_TRACE 14 /* single step a syscall */ |
| 67 | #define TIF_SYSCALL_TRACE 15 /* syscall trace active */ |
| 68 | #define TIF_MEMDIE 16 /* is terminating due to OOM killer */ |
| 69 | #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal */ |
| 70 | |
| 71 | #endif /* _ASM_M68K_THREAD_INFO_H */ |