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C6X: process management
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Original port to early 2.6 kernel using TI COFF toolchain.
Brought up to date by Mark Salter <msalter@redhat.com>

Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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Aurelien Jacquiot authored and Mark Salter committed Oct 6, 2011
1 parent 14aa7e8 commit 687b12b
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132 changes: 132 additions & 0 deletions arch/c6x/include/asm/processor.h
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/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*
* Updated for 2.6.34: 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_PROCESSOR_H
#define _ASM_C6X_PROCESSOR_H

#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/current.h>

/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() \
({ \
void *__pc; \
asm("mvc .S2 pce1,%0\n" : "=b"(__pc)); \
__pc; \
})

/*
* User space process size. This is mostly meaningless for NOMMU
* but some C6X processors may have RAM addresses up to 0xFFFFFFFF.
* Since calls like mmap() can return an address or an error, we
* have to allow room for error returns when code does something
* like:
*
* addr = do_mmap(...)
* if ((unsigned long)addr >= TASK_SIZE)
* ... its an error code, not an address ...
*
* Here, we allow for 4096 error codes which means we really can't
* use the last 4K page on systems with RAM extending all the way
* to the end of the 32-bit address space.
*/
#define TASK_SIZE 0xFFFFF000

/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's. We won't be using it
*/
#define TASK_UNMAPPED_BASE 0

struct thread_struct {
unsigned long long b15_14;
unsigned long long a15_14;
unsigned long long b13_12;
unsigned long long a13_12;
unsigned long long b11_10;
unsigned long long a11_10;
unsigned long long ricl_icl;
unsigned long usp; /* user stack pointer */
unsigned long pc; /* kernel pc */
unsigned long wchan;
};

#define INIT_THREAD \
{ \
.usp = 0, \
.wchan = 0, \
}

#define INIT_MMAP { \
&init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
NULL, NULL }

#define task_pt_regs(task) \
((struct pt_regs *)(THREAD_START_SP + task_stack_page(task)) - 1)

#define alloc_kernel_stack() __get_free_page(GFP_KERNEL)
#define free_kernel_stack(page) free_page((page))


/* Forward declaration, a strange C thing */
struct task_struct;

extern void start_thread(struct pt_regs *regs, unsigned int pc,
unsigned long usp);

/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}

/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)

extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

#define copy_segments(tsk, mm) do { } while (0)
#define release_segments(mm) do { } while (0)

/*
* saved PC of a blocked thread.
*/
#define thread_saved_pc(tsk) (task_pt_regs(tsk)->pc)

/*
* saved kernel SP and DP of a blocked thread.
*/
#ifdef _BIG_ENDIAN
#define thread_saved_ksp(tsk) \
(*(unsigned long *)&(tsk)->thread.b15_14)
#define thread_saved_dp(tsk) \
(*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
#else
#define thread_saved_ksp(tsk) \
(*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
#define thread_saved_dp(tsk) \
(*(unsigned long *)&(tsk)->thread.b15_14)
#endif

extern unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk) (task_pt_regs(task)->pc)
#define KSTK_ESP(tsk) (task_pt_regs(task)->sp)

#define cpu_relax() do { } while (0)

extern const struct seq_operations cpuinfo_op;

#endif /* ASM_C6X_PROCESSOR_H */
121 changes: 121 additions & 0 deletions arch/c6x/include/asm/thread_info.h
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/*
* 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_ORDER 0
#else
#define THREAD_SIZE 8192
#define THREAD_SHIFT 13
#define THREAD_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 */
struct exec_domain *exec_domain; /* execution domain */
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 */
struct restart_block restart_block;
};

/*
* 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, \
.exec_domain = &default_exec_domain, \
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
.addr_limit = KERNEL_DS, \
.restart_block = { \
.fn = do_no_restart_syscall, \
}, \
}

#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)

/* 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 __HAVE_ARCH_THREAD_INFO_ALLOCATOR

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
#else
#define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK)
#endif

#define alloc_thread_info_node(tsk, node) \
((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))

#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)
#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE 0x10000000

/*
* 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_POLLING_NRFLAG 16 /* true if polling TIF_NEED_RESCHED */
#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 */
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