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/*
* arch/ubicom32/include/asm/processor.h
* Thread related definitions for Ubicom32 architecture.
*
* (C) Copyright 2009, Ubicom, Inc.
* Copyright (C) 1995 Hamish Macdonald
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#ifndef _ASM_UBICOM32_PROCESSOR_H
#define _ASM_UBICOM32_PROCESSOR_H
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
#include <linux/compiler.h>
#include <linux/threads.h>
#include <asm/types.h>
#include <asm/segment.h>
#include <asm/fpu.h>
#include <asm/ptrace.h>
#include <asm/current.h>
#include <asm/thread_info.h>
#if defined(CONFIG_UBICOM32_V3)
#define CPU "IP5K"
#endif
#if defined(CONFIG_UBICOM32_V4)
#define CPU "IP7K"
#endif
#ifndef CPU
#define CPU "UNKNOWN"
#endif
/*
* User space process size: 1st byte beyond user address space.
*/
extern unsigned long memory_end;
#define TASK_SIZE (memory_end)
/*
* 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
/*
* This is the structure where we are going to save callee-saved registers.
* A5 is the return address, A7 is the stack pointer, A6 is the frame
* pointer. This is the frame that is created because of switch_to. This
* is not the frame due to interrupt preemption or because of syscall entry.
*/
struct thread_struct {
unsigned long d10; /* D10 */
unsigned long d11; /* D11 */
unsigned long d12; /* D12 */
unsigned long d13; /* D13 */
unsigned long a1; /* A1 */
unsigned long a2; /* A2 */
unsigned long a5; /* A5 return address. */
unsigned long a6; /* A6 */
unsigned long sp; /* A7 kernel stack pointer. */
};
#define INIT_THREAD { \
0, 0, 0, 0, 0, 0, 0, 0, \
sizeof(init_stack) + (unsigned long) init_stack - 8, \
}
/*
* Do necessary setup to start up a newly executed thread.
*
* pass the data segment into user programs if it exists,
* it can't hurt anything as far as I can tell
*/
/*
* Do necessary setup to start up a newly executed thread.
*/
#define start_thread(regs, new_pc, new_sp) \
do { \
regs->pc = new_pc & ~3; \
regs->an[5] = new_pc & ~3; \
regs->an[7] = new_sp; \
regs->nesting_level = -1; \
regs->frame_type = UBICOM32_FRAME_TYPE_NEW_THREAD; \
regs->thread_type = NORMAL_THREAD; \
} while(0)
/* Forward declaration, a strange C thing */
struct task_struct;
/* 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);
/*
* Free current thread data structures etc..
*/
static inline void exit_thread(void)
{
}
unsigned long thread_saved_pc(struct task_struct *tsk);
unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) (tsk->thread.a5)
#define KSTK_ESP(tsk) (tsk->thread.sp)
#define cpu_relax() barrier()
extern void processor_init(void);
extern unsigned int processor_timers(void);
extern unsigned int processor_threads(void);
extern unsigned int processor_frequency(void);
extern int processor_interrupts(unsigned int *int0, unsigned int *int1);
extern void processor_ocm(unsigned long *socm, unsigned long *eocm);
extern void processor_dram(unsigned long *sdram, unsigned long *edram);
#define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long))
#define KSTK_TOP(info) \
({ \
unsigned long *__ptr = (unsigned long *)(info); \
(unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \
})
#define task_pt_regs(task) \
({ \
struct pt_regs *__regs__; \
__regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
__regs__ - 1; \
})
#endif /* _ASM_UBICOM32_PROCESSOR_H */
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