mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 23:40:53 +07:00
0500871f21
Construct the init thread stack in the linker script rather than doing it by means of a union so that ia64's init_task.c can be got rid of. The following symbols are then made available from INIT_TASK_DATA() linker script macro: init_thread_union init_stack INIT_TASK_DATA() also expands the region to THREAD_SIZE to accommodate the size of the init stack. init_thread_union is given its own section so that it can be placed into the stack space in the right order. I'm assuming that the ia64 ordering is correct and that the task_struct is first and the thread_info second. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com> Tested-by: Will Deacon <will.deacon@arm.com> (arm64) Tested-by: Palmer Dabbelt <palmer@sifive.com> Acked-by: Thomas Gleixner <tglx@linutronix.de>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#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_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 */
|