irq.h

讲述linux的初始化过程

	__u8  state2    :  2;   /* path state value 2 */
	__u8  state3    :  1;   /* path state value 3 */
	__u8  resvd     :  3;   /* reserved */
	} __attribute__ ((packed)) path_state_t;

typedef struct {
   union {
		__u8         fc;   /* SPID function code */
		path_state_t ps;   /* SNID path state */
	} inf;
	__u32 cpu_addr  : 16;   /* CPU address */
	__u32 cpu_id    : 24;   /* CPU identification */
	__u32 cpu_model : 16;   /* CPU model */
	__u32 tod_high;         /* high word TOD clock */
	} __attribute__ ((packed)) pgid_t;

#define SPID_FUNC_MULTI_PATH       0x80
#define SPID_FUNC_ESTABLISH        0x00
#define SPID_FUNC_RESIGN           0x40
#define SPID_FUNC_DISBAND          0x20

#define SNID_STATE1_RESET          0x0
#define SNID_STATE1_UNGROUPED      0x8
#define SNID_STATE1_GROUPED        0xC

#define SNID_STATE2_NOT_RESVD      0x0
#define SNID_STATE2_RESVD_ELSE     0x8
#define SNID_STATE2_RESVD_SELF     0xC

#define SNID_STATE3_MULTI_PATH     1

/*
 * Flags used as input parameters for do_IO()
 */
#define DOIO_EARLY_NOTIFICATION 0x01    /* allow for I/O completion ... */
                                        /* ... notification after ... */
                                        /* ... primary interrupt status */
#define DOIO_RETURN_CHAN_END       DOIO_EARLY_NOTIFICATION
#define DOIO_VALID_LPM          0x02    /* LPM input parameter is valid */
#define DOIO_WAIT_FOR_INTERRUPT 0x04    /* wait synchronously for interrupt */
#define DOIO_REPORT_ALL         0x08    /* report all interrupt conditions */
#define DOIO_ALLOW_SUSPEND      0x10    /* allow for channel prog. suspend */
#define DOIO_DENY_PREFETCH      0x20    /* don't allow for CCW prefetch */
#define DOIO_SUPPRESS_INTER     0x40    /* suppress intermediate inter. */
                                        /* ... for suspended CCWs */
#define DOIO_TIMEOUT            0x80    /* 3 secs. timeout for sync. I/O */

/*
 * do_IO()
 *
 * Start a S/390 channel program. When the interrupt arrives
 *  handle_IRQ_event() is called, which eventually calls the
 *  IRQ handler, either immediately, delayed (dev-end missing,
 *  or sense required) or never (no IRQ handler registered -
 *  should never occur, as the IRQ (subchannel ID) should be
 *  disabled if no handler is present. Depending on the action
 *  taken, do_IO() returns :  0      - Success
 *                           -EIO    - Status pending
 *                                        see : action->dev_id->cstat
 *                                              action->dev_id->dstat
 *                           -EBUSY  - Device busy
 *                           -ENODEV - Device not operational
 */
int do_IO( int            irq,          /* IRQ aka. subchannel number */
           ccw1_t        *cpa,          /* logical channel program address */
           unsigned long  intparm,      /* interruption parameter */
           __u8           lpm,          /* logical path mask */
           unsigned long  flag);        /* flags : see above */

int start_IO( int           irq,       /* IRQ aka. subchannel number */
              ccw1_t       *cpa,       /* logical channel program address */
              unsigned int  intparm,   /* interruption parameter */
              __u8          lpm,       /* logical path mask */
              unsigned int  flag);     /* flags : see above */

void do_crw_pending( void  );	         /* CRW handler */

int resume_IO( int irq);               /* IRQ aka. subchannel number */

int halt_IO( int           irq,         /* IRQ aka. subchannel number */
             unsigned long intparm,     /* dummy intparm */
             unsigned long flag);       /* possible DOIO_WAIT_FOR_INTERRUPT */

int clear_IO( int           irq,         /* IRQ aka. subchannel number */
              unsigned long intparm,     /* dummy intparm */
              unsigned long flag);       /* possible DOIO_WAIT_FOR_INTERRUPT */

int process_IRQ( struct pt_regs regs,
                 unsigned int   irq,
                 unsigned int   intparm);


int enable_cpu_sync_isc ( int irq );
int disable_cpu_sync_isc( int irq );

typedef struct {
     int          irq;                  /* irq, aka. subchannel */
     __u16        devno;                /* device number */
     unsigned int status;               /* device status */
     senseid_t    sid_data;             /* senseID data */
     } dev_info_t;

int get_dev_info( int irq, dev_info_t *);   /* to be eliminated - don't use */

int get_dev_info_by_irq  ( int irq, dev_info_t *pdi);
int get_dev_info_by_devno( __u16 devno, dev_info_t *pdi);

int          get_irq_by_devno( __u16 devno );
unsigned int get_devno_by_irq( int irq );

int get_irq_first( void );
int get_irq_next ( int irq );

int read_dev_chars( int irq, void **buffer, int length );
int read_conf_data( int irq, void **buffer, int *length );

extern int handle_IRQ_event( unsigned int irq, int cpu, struct pt_regs *);

extern int set_cons_dev(int irq);
extern int reset_cons_dev(int irq);
extern int wait_cons_dev(int irq);

/*
 * Some S390 specific IO instructions as inline
 */

extern __inline__ int stsch(int irq, volatile schib_t *addr)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                "STSCH 0(%2)\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "r" (irq | 0x10000L), "a" (addr)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int msch(int irq, volatile schib_t *addr)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                "MSCH 0(%2)\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "r" (irq | 0x10000L), "a" (addr)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int msch_err(int irq, volatile schib_t *addr)
{
        int ccode;

        __asm__ __volatile__(
                "    lr   1,%1\n"
                "    msch 0(%2)\n"
                "0:  ipm  %0\n"
                "    srl  %0,28\n"
                "1:\n"
                ".section .fixup,\"ax\"\n"
                "2:  l    %0,%3\n"
                "    bras 1,3f\n"
                "    .long 1b\n"
                "3:  l    1,0(1)\n"
                "    br   1\n"
                ".previous\n"
                ".section __ex_table,\"a\"\n"
                "   .align 4\n"
                "   .long 0b,2b\n"
                ".previous"
                : "=d" (ccode)
                : "r" (irq | 0x10000L), "a" (addr), "i" (__LC_PGM_ILC)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int tsch(int irq, volatile irb_t *addr)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                "TSCH 0(%2)\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "r" (irq | 0x10000L), "a" (addr)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int tpi( volatile tpi_info_t *addr)
{
        int ccode;

        __asm__ __volatile__(
                "TPI 0(%1)\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "a" (addr)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int ssch(int irq, volatile orb_t *addr)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                "SSCH 0(%2)\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "r" (irq | 0x10000L), "a" (addr)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int rsch(int irq)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                "RSCH\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "r" (irq | 0x10000L)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int csch(int irq)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                "CSCH\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "r" (irq | 0x10000L)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int hsch(int irq)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                "HSCH\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "r" (irq | 0x10000L)
                : "cc", "1" );
        return ccode;
}

extern __inline__ int iac( void)
{
        int ccode;

        __asm__ __volatile__(
                "IAC 1\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : : "cc", "1" );
        return ccode;
}

typedef struct {
     __u16 vrdcdvno : 16;   /* device number (input) */
     __u16 vrdclen  : 16;   /* data block length (input) */
     __u32 vrdcvcla : 8;    /* virtual device class (output) */
     __u32 vrdcvtyp : 8;    /* virtual device type (output) */
     __u32 vrdcvsta : 8;    /* virtual device status (output) */
     __u32 vrdcvfla : 8;    /* virtual device flags (output) */
     __u32 vrdcrccl : 8;    /* real device class (output) */
     __u32 vrdccrty : 8;    /* real device type (output) */
     __u32 vrdccrmd : 8;    /* real device model (output) */
     __u32 vrdccrft : 8;    /* real device feature (output) */
     } __attribute__ ((packed,aligned(4))) diag210_t;

void VM_virtual_device_info( __u16      devno,   /* device number */
                             senseid_t *ps );    /* ptr to senseID data */

extern __inline__ int diag210( diag210_t * addr)
{
        int ccode;

        __asm__ __volatile__(
                "LR 1,%1\n\t"
                ".long 0x83110210\n\t"
                "IPM %0\n\t"
                "SRL %0,28\n\t"
                : "=d" (ccode) : "a" (addr)
                : "cc", "1" );
        return ccode;
}

/*
 * Various low-level irq details needed by irq.c, process.c,
 * time.c, io_apic.c and smp.c
 *
 * Interrupt entry/exit code at both C and assembly level
 */

void mask_irq(unsigned int irq);
void unmask_irq(unsigned int irq);

#define MAX_IRQ_SOURCES 128

extern spinlock_t irq_controller_lock;

#ifdef CONFIG_SMP

#include <asm/atomic.h>

static inline void irq_enter(int cpu, unsigned int irq)
{
        hardirq_enter(cpu);
        while (test_bit(0,&global_irq_lock)) {
                eieio();
        }
}

static inline void irq_exit(int cpu, unsigned int irq)
{
        hardirq_exit(cpu);
        release_irqlock(cpu);
}


#else

#define irq_enter(cpu, irq)     (++local_irq_count(cpu))
#define irq_exit(cpu, irq)      (--local_irq_count(cpu))

#endif

#define __STR(x) #x
#define STR(x) __STR(x)

#ifdef CONFIG_SMP

/*
 *      SMP has a few special interrupts for IPI messages
 */

#endif /* CONFIG_SMP */

/*
 * x86 profiling function, SMP safe. We might want to do this in
 * assembly totally?
 */
static inline void s390_do_profile (unsigned long addr)
{
#if 0
        if (prof_buffer && current->pid) {
                addr -= (unsigned long) &_stext;
                addr >>= prof_shift;
                /*
                 * Don't ignore out-of-bounds EIP values silently,
                 * put them into the last histogram slot, so if
                 * present, they will show up as a sharp peak.
                 */
                if (addr > prof_len-1)
                        addr = prof_len-1;
                atomic_inc((atomic_t *)&prof_buffer[addr]);
        }
#endif
}

#include <asm/s390io.h>

#define s390irq_spin_lock(irq) \
        spin_lock(&(ioinfo[irq]->irq_lock))

#define s390irq_spin_unlock(irq) \
        spin_unlock(&(ioinfo[irq]->irq_lock))

#define s390irq_spin_lock_irqsave(irq,flags) \
        spin_lock_irqsave(&(ioinfo[irq]->irq_lock), flags)
#define s390irq_spin_unlock_irqrestore(irq,flags) \
        spin_unlock_irqrestore(&(ioinfo[irq]->irq_lock), flags)
#endif