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    Subject[RFC/PATCH] FUSYN 3/11: Support for i386
     arch/i386/kernel/entry.S  |    5 +++
    include/asm-i386/fulock.h | 70 ++++++++++++++++++++++++++++++++++++++++++++++
    include/asm-i386/unistd.h | 7 +++-
    3 files changed, 81 insertions(+), 1 deletion(-)

    --- arch/i386/kernel/entry.S:1.1.1.13 Tue Apr 6 01:51:19 2004
    +++ arch/i386/kernel/entry.S Tue Apr 6 02:15:23 2004
    @@ -882,5 +882,10 @@
    .long sys_utimes
    .long sys_fadvise64_64
    .long sys_ni_syscall /* sys_vserver */
    + .long sys_ufulock_lock
    + .long sys_ufulock_unlock /* 275 */
    + .long sys_ufulock_ctl
    + .long sys_ufuqueue_wait
    + .long sys_ufuqueue_wake /* 278 */

    syscall_table_size=(.-sys_call_table)
    --- /dev/null Thu Apr 15 00:58:25 2004
    +++ include/asm-i386/fulock.h Mon Feb 2 23:07:28 2004
    @@ -0,0 +1,70 @@
    +
    +/*
    + * Fast User real-time/pi/pp/robust/deadlock SYNchronization
    + * (C) 2002-2003 Intel Corp
    + * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>.
    + *
    + * Licensed under the FSF's GNU Public License v2 or later.
    + *
    + * Based on normal futexes (futex.c), (C) Rusty Russell.
    + * Please refer to Documentation/fusyn.txt for more info.
    + */
    +
    +#ifndef __asm_i386_fulock_h__
    +#define __asm_i386_fulock_h__
    +
    + /* fulock value / state; anything that is not this is a PID that
    + * currently owns the fulock. */
    +
    +enum vfulock {
    + VFULOCK_UNLOCKED = 0x00000000, /* Unlocked */
    + VFULOCK_HEALTHY = VFULOCK_UNLOCKED, /* KCO mode: the lock is healthy */
    + VFULOCK_WP = 0xfffffffd, /* Waiters blocked in the kernel */
    + VFULOCK_DEAD = 0xfffffffe, /* dead, kernel controls ownership */
    + VFULOCK_NR = 0xffffffff /* fulock is not-recoverable */
    +};
    +
    +
    +#ifdef __KERNEL__
    +
    +/**
    + * [User usable] Atomic compare and swap.
    + *
    + * Used for locking a vfulock.
    + *
    + * @value Pointer to the value to compare and swap.
    + * @old_value Value that *value has to have for the swap to occur.
    + * @new_value New value to set it *value == old_value.
    + * @return !0 if the swap succeeded. 0 if failed.
    + */
    +static inline
    +unsigned vfulock_acas (volatile unsigned *value,
    + unsigned old_value, unsigned new_value)
    +{
    + unsigned result;
    + asm __volatile__ (
    + "lock cmpxchg %3, %1"
    + : "=a" (result), "+m" ((*value))
    + : "a" (old_value), "r" (new_value)
    + : "memory");
    + return result == old_value;
    +}
    +
    +
    +/**
    + * Set an ufulock's associated value.
    + *
    + * @vfulock: Pointer to the address of the ufulock to contain for.
    + * @value: New value to assign.
    + *
    + * Wrapper for arch-specific idiosyncrasies when setting a value that
    + * is shared across different address mappings.
    + */
    +static inline
    +void vfulock_set (volatile unsigned *vfulock, unsigned value)
    +{
    + *vfulock = value;
    +}
    +
    +#endif /* #ifdef __KERNEL__ */
    +#endif /* #ifndef __asm_i386_fulock_h__ */
    --- include/asm-i386/unistd.h:1.1.1.8 Tue Apr 6 01:51:33 2004
    +++ include/asm-i386/unistd.h Tue Apr 6 02:16:24 2004
    @@ -279,8 +279,13 @@
    #define __NR_utimes 271
    #define __NR_fadvise64_64 272
    #define __NR_vserver 273
    +#define __NR_ufulock_lock 274
    +#define __NR_ufulock_unlock 275
    +#define __NR_ufulock_ctl 276
    +#define __NR_ufuqueue_wait 277
    +#define __NR_ufuqueue_wake 278

    -#define NR_syscalls 274
    +#define NR_syscalls 279

    /* user-visible error numbers are in the range -1 - -124: see <asm-i386/errno.h> */

    -
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