processor.h

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#ifndef _ASM_M32R_PROCESSOR_H
#define _ASM_M32R_PROCESSOR_H

/*
 * include/asm-m32r/processor.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994  Linus Torvalds
 * Copyright (C) 2001  Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
 * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
 */

#include <linux/kernel.h>
#include <asm/cache.h>
#include <asm/ptrace.h>  /* pt_regs */

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l; })

/*
 *  CPU type and hardware bug flags. Kept separately for each CPU.
 *  Members of this structure are referenced in head.S, so think twice
 *  before touching them. [mj]
 */

struct cpuinfo_m32r {
    unsigned long pgtable_cache_sz;
    unsigned long cpu_clock;
    unsigned long bus_clock;
    unsigned long timer_divide;
    unsigned long loops_per_jiffy;
};

/*
 * capabilities of CPUs
 */

extern struct cpuinfo_m32r boot_cpu_data;

#ifdef CONFIG_SMP
extern struct cpuinfo_m32r cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else
#define cpu_data (&boot_cpu_data)
#define current_cpu_data boot_cpu_data
#endif

/*
 * User space process size: 2GB (default).
 */
#ifdef CONFIG_MMU
#define TASK_SIZE  (0x80000000UL)
#else
#define TASK_SIZE  (0x00400000UL)
#endif

#ifdef __KERNEL__
#define STACK_TOP   TASK_SIZE
#define STACK_TOP_MAX   STACK_TOP
#endif

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE  PAGE_ALIGN(TASK_SIZE / 3)

typedef struct {
    unsigned long seg;
} mm_segment_t;

#define MAX_TRAPS 10

struct debug_trap {
    int nr_trap;
    unsigned long   addr[MAX_TRAPS];
    unsigned long   insn[MAX_TRAPS];
};

struct thread_struct {
    unsigned long address;
    unsigned long trap_no;      /* Trap number  */
    unsigned long error_code;   /* Error code of trap */
    unsigned long lr;       /* saved pc */
    unsigned long sp;       /* user stack pointer */
    struct debug_trap debug_trap;
};

#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)

#define INIT_THREAD {   \
    .sp = INIT_SP,      \
}

/*
 * Do necessary setup to start up a newly executed thread.
 */

/* User process Backup PSW */
#define USERPS_BPSW (M32R_PSW_BSM|M32R_PSW_BIE|M32R_PSW_BPM)

#define start_thread(regs, new_pc, new_spu)                 \
    do {                                \
        regs->psw = (regs->psw | USERPS_BPSW) & 0x0000FFFFUL;   \
        regs->bpc = new_pc;                 \
        regs->spu = new_spu;                    \
    } while (0)

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

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

/*
 * create a kernel thread without removing it from tasklists
 */
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

/* Copy and release all segment info associated with a VM */
extern void copy_segments(struct task_struct *p, struct mm_struct * mm);
extern void release_segments(struct mm_struct * mm);

extern unsigned long thread_saved_pc(struct task_struct *);

/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm)  do { } while (0)
#define release_segments(mm)  do { } while (0)

unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk)  ((tsk)->thread.lr)
#define KSTK_ESP(tsk)  ((tsk)->thread.sp)

#define cpu_relax() barrier()

#endif /* _ASM_M32R_PROCESSOR_H */