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Diffstat (limited to '')
-rw-r--r-- | arch/c6x/include/asm/thread_info.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/c6x/include/asm/thread_info.h b/arch/c6x/include/asm/thread_info.h new file mode 100644 index 000000000..dd8913d57 --- /dev/null +++ b/arch/c6x/include/asm/thread_info.h @@ -0,0 +1,94 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Port on Texas Instruments TMS320C6x architecture + * + * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated + * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com) + * + * Updated for 2.6.3x: Mark Salter <msalter@redhat.com> + */ +#ifndef _ASM_C6X_THREAD_INFO_H +#define _ASM_C6X_THREAD_INFO_H + +#ifdef __KERNEL__ + +#include <asm/page.h> + +#ifdef CONFIG_4KSTACKS +#define THREAD_SIZE 4096 +#define THREAD_SHIFT 12 +#define THREAD_SIZE_ORDER 0 +#else +#define THREAD_SIZE 8192 +#define THREAD_SHIFT 13 +#define THREAD_SIZE_ORDER 1 +#endif + +#define THREAD_START_SP (THREAD_SIZE - 8) + +#ifndef __ASSEMBLY__ + +typedef struct { + unsigned long seg; +} mm_segment_t; + +/* + * low level task data. + */ +struct thread_info { + struct task_struct *task; /* main task structure */ + unsigned long flags; /* low level flags */ + int cpu; /* cpu we're on */ + int preempt_count; /* 0 = preemptable, <0 = BUG */ + mm_segment_t addr_limit; /* thread address space */ +}; + +/* + * macros/functions for gaining access to the thread information structure + * + * preempt_count needs to be 1 initially, until the scheduler is functional. + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .flags = 0, \ + .cpu = 0, \ + .preempt_count = INIT_PREEMPT_COUNT, \ + .addr_limit = KERNEL_DS, \ +} + +/* get the thread information struct of current task */ +static inline __attribute__((const)) +struct thread_info *current_thread_info(void) +{ + struct thread_info *ti; + asm volatile (" clr .s2 B15,0,%1,%0\n" + : "=b" (ti) + : "Iu5" (THREAD_SHIFT - 1)); + return ti; +} + +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) +#endif /* __ASSEMBLY__ */ + +/* + * thread information flag bit numbers + * - pending work-to-be-done flags are in LSW + * - other flags in MSW + */ +#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ +#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ +#define TIF_SIGPENDING 2 /* signal pending */ +#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ +#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ +#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ + +#define TIF_MEMDIE 17 /* OOM killer killed process */ + +#define TIF_WORK_MASK 0x00007FFE /* work on irq/exception return */ +#define TIF_ALLWORK_MASK 0x00007FFF /* work on any return to u-space */ + +#endif /* __KERNEL__ */ + +#endif /* _ASM_C6X_THREAD_INFO_H */ |