processor.h

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#ifndef _ASM_SCORE_PROCESSOR_H
#define _ASM_SCORE_PROCESSOR_H

#include <linux/cpumask.h>
#include <linux/threads.h>

#include <asm/segment.h>

struct task_struct;

/*
 * System setup and hardware flags..
 */
extern void (*cpu_wait)(void);

extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *tsk);
extern void start_thread(struct pt_regs *regs,
            unsigned long pc, unsigned long sp);
extern unsigned long get_wchan(struct task_struct *p);

/*
 * Return current * instruction pointer ("program counter").
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l; })

#define cpu_relax()     barrier()
#define release_thread(thread)  do {} while (0)

/*
 * User space process size: 2GB. This is hardcoded into a few places,
 * so don't change it unless you know what you are doing.
 */
#define TASK_SIZE   0x7fff8000UL

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

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

/*
 * If you change thread_struct remember to change the #defines below too!
 */
struct thread_struct {
    unsigned long reg0, reg2, reg3;
    unsigned long reg12, reg13, reg14, reg15, reg16;
    unsigned long reg17, reg18, reg19, reg20, reg21;

    unsigned long cp0_psr;
    unsigned long cp0_ema;      /* Last user fault */
    unsigned long cp0_badvaddr; /* Last user fault */
    unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
    unsigned long error_code;
    unsigned long trap_no;

    unsigned long mflags;
    unsigned long reg29;

    unsigned long single_step;
    unsigned long ss_nextcnt;

    unsigned long insn1_type;
    unsigned long addr1;
    unsigned long insn1;

    unsigned long insn2_type;
    unsigned long addr2;
    unsigned long insn2;

    mm_segment_t current_ds;
};

#define INIT_THREAD {                       \
    .reg0           = 0,                \
    .reg2           = 0,                \
    .reg3           = 0,                \
    .reg12          = 0,                \
    .reg13          = 0,                \
    .reg14          = 0,                \
    .reg15          = 0,                \
    .reg16          = 0,                \
    .reg17          = 0,                \
    .reg18          = 0,                \
    .reg19          = 0,                \
    .reg20          = 0,                \
    .reg21          = 0,                \
    .cp0_psr        = 0,                \
    .error_code     = 0,                \
    .trap_no        = 0,                \
}

#define kstk_tos(tsk)       \
    ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)
#define task_pt_regs(tsk)   ((struct pt_regs *)kstk_tos(tsk) - 1)

#define KSTK_EIP(tsk)       (task_pt_regs(tsk)->cp0_epc)
#define KSTK_ESP(tsk)       (task_pt_regs(tsk)->regs[29])

#endif /* _ASM_SCORE_PROCESSOR_H */