111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
#ifndef _LWK_FUTEX_H
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#define _LWK_FUTEX_H
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/** \name Futex Commands
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* @{
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*/
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_CMP_REQUEUE 4
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#define FUTEX_WAKE_OP 5
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#define FUTEX_WAIT_BITSET 9
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#define FUTEX_WAKE_BITSET 10
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// @}
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#define FUTEX_PRIVATE_FLAG 128
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#define FUTEX_CLOCK_REALTIME 256
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#define FUTEX_CMD_MASK ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME)
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/** \name Futex Operations, used for FUTEX_WAKE_OP
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* @{
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*/
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#define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */
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#define FUTEX_OP_ADD 1 /* *(int *)UADDR2 += OPARG; */
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#define FUTEX_OP_OR 2 /* *(int *)UADDR2 |= OPARG; */
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#define FUTEX_OP_ANDN 3 /* *(int *)UADDR2 &= ~OPARG; */
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#define FUTEX_OP_XOR 4 /* *(int *)UADDR2 ^= OPARG; */
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#define FUTEX_OP_OPARG_SHIFT 8 /* Use (1 << OPARG) instead of OPARG. */
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#define FUTEX_OP_CMP_EQ 0 /* if (oldval == CMPARG) wake */
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#define FUTEX_OP_CMP_NE 1 /* if (oldval != CMPARG) wake */
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#define FUTEX_OP_CMP_LT 2 /* if (oldval < CMPARG) wake */
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#define FUTEX_OP_CMP_LE 3 /* if (oldval <= CMPARG) wake */
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#define FUTEX_OP_CMP_GT 4 /* if (oldval > CMPARG) wake */
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#define FUTEX_OP_CMP_GE 5 /* if (oldval >= CMPARG) wake */
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// @}
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/* FUTEX_WAKE_OP will perform atomically
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int oldval = *(int *)UADDR2;
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*(int *)UADDR2 = oldval OP OPARG;
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if (oldval CMP CMPARG)
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wake UADDR2; */
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#define FUTEX_OP(op, oparg, cmp, cmparg) \
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(((op & 0xf) << 28) | ((cmp & 0xf) << 24) \
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| ((oparg & 0xfff) << 12) | (cmparg & 0xfff))
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/*
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* bitset with all bits set for the FUTEX_xxx_BITSET OPs to request a
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* match of any bit.
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*/
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#define FUTEX_BITSET_MATCH_ANY 0xffffffff
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#ifdef __KERNEL__
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#include <lwk/spinlock.h>
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#include <lwk/list.h>
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#include <lwk/waitq.h>
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#include <arch/futex.h>
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#define FUTEX_HASHBITS 8 /* 256 entries in each futex hash tbl */
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/** Futex tracking structure.
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*
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* A futex has a woken state, just like tasks have TASK_RUNNING.
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* It is considered woken when list_empty(&futex->link) || futex->lock_ptr == 0.
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* The order of wakup is always to make the first condition true, then
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* wake up futex->waitq, then make the second condition true.
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*/
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struct futex {
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struct list_head link;
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struct waitq waitq;
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spinlock_t * lock_ptr;
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uint32_t __user * uaddr;
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uint32_t bitset;
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};
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struct futex_queue {
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spinlock_t lock;
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struct list_head futex_list;
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};
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extern void
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futex_queue_init(
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struct futex_queue * queue
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);
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extern int
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futex(
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uint32_t __user * uaddr,
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int op,
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uint32_t val,
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uint64_t timeout,
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uint32_t __user * uaddr2,
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uint32_t val2,
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uint32_t val3,
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int fshared
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);
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extern long
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sys_futex(
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uint32_t __user * uaddr,
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int op,
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uint32_t val,
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struct timespec __user * utime,
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uint32_t __user * uaddr2,
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uint32_t val3
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);
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#endif
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#endif
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