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author | Gregory Nutt <gnutt@nuttx.org> | 2015-03-28 14:46:35 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2015-03-28 14:46:35 -0600 |
commit | d4f239dfd3bb5c11c3bd214341cd5a3b09a33c76 (patch) | |
tree | bc3109617522ffcd848d9e3b1a8e03af47bf05c1 /nuttx | |
parent | 1f9e5b963597efa4f16a03632ee8a72f0bd4b187 (diff) | |
download | px4-nuttx-d4f239dfd3bb5c11c3bd214341cd5a3b09a33c76.tar.gz px4-nuttx-d4f239dfd3bb5c11c3bd214341cd5a3b09a33c76.tar.bz2 px4-nuttx-d4f239dfd3bb5c11c3bd214341cd5a3b09a33c76.zip |
Clean up pointer handling to make code more readability. This re-introduces the compiler optimization problem but this is the correct thing to do. I will have to drop back from -Os to -O2.
Diffstat (limited to 'nuttx')
-rw-r--r-- | nuttx/arch/arm/src/samv7/sam_emac.c | 241 |
1 files changed, 140 insertions, 101 deletions
diff --git a/nuttx/arch/arm/src/samv7/sam_emac.c b/nuttx/arch/arm/src/samv7/sam_emac.c index f093658f9..80792687a 100644 --- a/nuttx/arch/arm/src/samv7/sam_emac.c +++ b/nuttx/arch/arm/src/samv7/sam_emac.c @@ -1048,13 +1048,15 @@ static void sam_putreg(struct sam_emac_s *priv, uint16_t offset, static uint16_t sam_txinuse(struct sam_emac_s *priv, int qid) { - uint32_t txhead32 = (uint32_t)priv->xfrq[qid].txhead; - if ((uint32_t)priv->xfrq[qid].txtail > txhead32) + struct sam_queue_s *xfrq = &priv->xfrq[qid]; + + uint32_t txhead32 = (uint32_t)xfrq->txhead; + if ((uint32_t)xfrq->txtail > txhead32) { - txhead32 += priv->xfrq[qid].ntxbuffers; + txhead32 += xfrq->ntxbuffers; } - return (uint16_t)(txhead32 - (uint32_t)priv->xfrq[qid].txtail); + return (uint16_t)(txhead32 - (uint32_t)xfrq->txtail); } /**************************************************************************** @@ -1103,6 +1105,7 @@ static uint16_t sam_txfree(struct sam_emac_s *priv, int qid) static int sam_buffer_allocate(struct sam_emac_s *priv) { #ifdef CONFIG_SAMV7_EMAC_PREALLOCATE + struct sam_queue_s *xfrq; int qid; /* Use pre-allocated buffers */ @@ -1121,18 +1124,21 @@ static int sam_buffer_allocate(struct sam_emac_s *priv) for (qid = 1; qid < EMAC_NQUEUES; qid++) { - priv->xfrq[qid].txdesc = priv->attr->tx1desc; - priv->xfrq[qid].ntxbuffers = DUMMY_NBUFFERS; - priv->xfrq[qid].rxdesc = priv->attr->rx1desc; - priv->xfrq[qid].nrxbuffers = DUMMY_NBUFFERS; + xfrq = &priv->xfrq[qid]; + + xfrq->txdesc = priv->attr->tx1desc; + xfrq->ntxbuffers = DUMMY_NBUFFERS; + xfrq->rxdesc = priv->attr->rx1desc; + xfrq->nrxbuffers = DUMMY_NBUFFERS; - priv->xfrq[qid].txbuffer = priv->attr->tx1buffer; - priv->xfrq[qid].txbufsize = DUMMY_BUFSIZE; - priv->xfrq[qid].rxbuffer = priv->attr->rx1buffer; - priv->xfrq[qid].rxbufsize = DUMMY_BUFSIZE; + xfrq->txbuffer = priv->attr->tx1buffer; + xfrq->txbufsize = DUMMY_BUFSIZE; + xfrq->rxbuffer = priv->attr->rx1buffer; + xfrq->rxbufsize = DUMMY_BUFSIZE; } #else + struct sam_queue_s *xfrq; size_t allocsize; int qid; @@ -1234,17 +1240,19 @@ static int sam_buffer_allocate(struct sam_emac_s *priv) for (qid = 2; qid < EMAC_NQUEUES; qid++) { - priv->xfrq[qid].txdesc = priv->xfrq[1].txdesc; - priv->xfrq[qid].rxdesc = priv->xfrq[1].rxdesc; + xfrq = &priv->xfrq[qid]; - priv->xfrq[qid].txbuffer = priv->xfrq[1].txbuffer; - priv->xfrq[qid].rxbuffer = priv->xfrq[1].rxbuffer; + xfrq->txdesc = priv->xfrq[1].txdesc; + xfrq->rxdesc = priv->xfrq[1].rxdesc; - priv->xfrq[qid].ntxbuffers = DUMMY_NBUFFERS; - priv->xfrq[qid].nrxbuffers = DUMMY_NBUFFERS; + xfrq->txbuffer = priv->xfrq[1].txbuffer; + xfrq->rxbuffer = priv->xfrq[1].rxbuffer; - priv->xfrq[qid].txbufsize = DUMMY_BUFSIZE; - priv->xfrq[qid].rxbufsize = DUMMY_BUFSIZE; + xfrq->ntxbuffers = DUMMY_NBUFFERS; + xfrq->nrxbuffers = DUMMY_NBUFFERS; + + xfrq->txbufsize = DUMMY_BUFSIZE; + xfrq->rxbufsize = DUMMY_BUFSIZE; } #endif @@ -1281,43 +1289,45 @@ static int sam_buffer_allocate(struct sam_emac_s *priv) static void sam_buffer_free(struct sam_emac_s *priv) { #ifndef CONFIG_SAMV7_EMAC_PREALLOCATE + struct sam_queue_s *xfrq; int qid; /* Free allocated buffers */ for (qid = 0; qid < EMAC_NQUEUES; qid++) { + xfrq = &priv->xfrq[qid]; if (qid < 2) { - if (priv->xfrq[qid].txdesc) + if (xfrq->txdesc) { - kmm_free(priv->xfrq[qid].txdesc); - priv->xfrq[qid].txdesc = NULL; + kmm_free(xfrq->txdesc); + xfrq->txdesc = NULL; } - if (priv->xfrq[qid].rxdesc) + if (xfrq->rxdesc) { - kmm_free(priv->xfrq[qid].rxdesc); - priv->xfrq[qid].rxdesc = NULL; + kmm_free(xfrq->rxdesc); + xfrq->rxdesc = NULL; } - if (priv->xfrq[qid].txbuffer) + if (xfrq->txbuffer) { - kmm_free(priv->xfrq[qid].txbuffer); - priv->xfrq[qid].txbuffer = NULL; + kmm_free(xfrq->txbuffer); + xfrq->txbuffer = NULL; } - if (priv->xfrq[qid].rxbuffer) + if (xfrq->rxbuffer) { - kmm_free(priv->xfrq[qid].rxbuffer); - priv->xfrq[qid].rxbuffer = NULL; + kmm_free(xfrq->rxbuffer); + xfrq->rxbuffer = NULL; } } - priv->xfrq[qid].txdesc = NULL; - priv->xfrq[qid].rxdesc = NULL; - priv->xfrq[qid].txbuffer = NULL; - priv->xfrq[qid].rxbuffer = NULL; + xfrq->txdesc = NULL; + xfrq->rxdesc = NULL; + xfrq->txbuffer = NULL; + xfrq->rxbuffer = NULL; } #endif } @@ -1349,13 +1359,11 @@ static int sam_transmit(struct sam_emac_s *priv, int qid) { struct net_driver_s *dev = &priv->dev; volatile struct emac_txdesc_s *txdesc; + struct sam_queue_s *xfrq; uint32_t regval; uint32_t status; uint16_t txhead; - nllvdbg("d_len: %d txhead: %d\n", dev->d_len, priv->xfrq[qid].txhead); - sam_dumppacket("Transmit packet", dev->d_buf, dev->d_len); - /* Check parameter */ if (dev->d_len > EMAC_TX_UNITSIZE) @@ -1366,8 +1374,12 @@ static int sam_transmit(struct sam_emac_s *priv, int qid) /* Pointer to the current TX descriptor */ - txhead = priv->xfrq[qid].txhead; - txdesc = &priv->xfrq[qid].txdesc[txhead]; + xfrq = &priv->xfrq[qid]; + txhead = xfrq->txhead; + txdesc = &xfrq->txdesc[txhead]; + + nllvdbg("d_len: %d txhead[%d]: %d\n", dev->d_len, qid, xfrq->txhead); + sam_dumppacket("Transmit packet", dev->d_buf, dev->d_len); /* If no free TX descriptor, buffer can't be sent */ @@ -1381,17 +1393,20 @@ static int sam_transmit(struct sam_emac_s *priv, int qid) if (dev->d_len > 0) { - /* Driver managed the ring buffer */ + /* Copy the data into the driver managed the ring buffer. If we + * wanted to support zero copy transfers, we would need to make sure + * that dev->d_buf and txdesc->addr refer to the same memory. + */ memcpy((void *)txdesc->addr, dev->d_buf, dev->d_len); - arch_clean_dcache((uintptr_t)txdesc->addr, - (uintptr_t)txdesc->addr + dev->d_len); + arch_clean_dcache((uint32_t)txdesc->addr, + (uint32_t)txdesc->addr + dev->d_len); } /* Update TX descriptor status (with USED=0). */ status = dev->d_len | EMACTXD_STA_LAST; - if (txhead == priv->xfrq[qid].ntxbuffers - 1) + if (txhead == xfrq->ntxbuffers - 1) { status |= EMACTXD_STA_WRAP; } @@ -1404,12 +1419,12 @@ static int sam_transmit(struct sam_emac_s *priv, int qid) /* Increment the head index */ - if (++txhead >= priv->xfrq[qid].ntxbuffers) + if (++txhead >= xfrq->ntxbuffers) { txhead = 0; } - priv->xfrq[qid].txhead = txhead; + xfrq->txhead = txhead; /* Now start transmission (if it is not already done) */ @@ -1593,6 +1608,7 @@ static void sam_dopoll(struct sam_emac_s *priv, int qid) static int sam_recvframe(struct sam_emac_s *priv, int qid) { volatile struct emac_rxdesc_s *rxdesc; + struct sam_queue_s *xfrq; struct net_driver_s *dev; const uint8_t *src; uint8_t *dest; @@ -1611,8 +1627,9 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) dest = dev->d_buf; pktlen = 0; - rxndx = priv->xfrq[qid].rxndx; - rxdesc = &priv->xfrq[qid].rxdesc[rxndx]; + xfrq = &priv->xfrq[qid]; + rxndx = xfrq->rxndx; + rxdesc = &xfrq->rxdesc[rxndx]; isframe = false; /* Invalidate the RX descriptor to force re-fetching from RAM. */ @@ -1634,11 +1651,11 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) * start fragment until it is equal to the index with the SOF mark */ - while (rxndx != priv->xfrq[qid].rxndx) + while (rxndx != xfrq->rxndx) { /* Give ownership back to the EMAC */ - rxdesc = &priv->xfrq[qid].rxdesc[priv->xfrq[qid].rxndx]; + rxdesc = &xfrq->rxdesc[xfrq->rxndx]; rxdesc->addr &= ~(EMACRXD_ADDR_OWNER); /* Flush the modified RX descriptor to RAM */ @@ -1649,9 +1666,9 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) /* Increment the RX index to the start fragment */ - if (++priv->xfrq[qid].rxndx >= priv->xfrq[qid].nrxbuffers) + if (++xfrq->rxndx >= xfrq->nrxbuffers) { - priv->xfrq[qid].rxndx = 0; + xfrq->rxndx = 0; } } @@ -1670,7 +1687,7 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) * of the next frame). */ - if (++rxndx >= priv->xfrq[qid].nrxbuffers) + if (++rxndx >= xfrq->nrxbuffers) { rxndx = 0; } @@ -1679,14 +1696,14 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) if (isframe) { - if (rxndx == priv->xfrq[qid].rxndx) + if (rxndx == xfrq->rxndx) { nllvdbg("ERROR: No EOF (Invalid or buffers too small)\n"); do { /* Give ownership back to the EMAC */ - rxdesc = &priv->xfrq[qid].rxdesc[priv->xfrq[qid].rxndx]; + rxdesc = &xfrq->rxdesc[xfrq->rxndx]; rxdesc->addr &= ~(EMACRXD_ADDR_OWNER); /* Flush the modified RX descriptor to RAM */ @@ -1697,12 +1714,12 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) /* Increment the RX index */ - if (++priv->xfrq[qid].rxndx >= priv->xfrq[qid].nrxbuffers) + if (++xfrq->rxndx >= xfrq->nrxbuffers) { - priv->xfrq[qid].rxndx = 0; + xfrq->rxndx = 0; } } - while (rxndx != priv->xfrq[qid].rxndx); + while (rxndx != xfrq->rxndx); return -EIO; } @@ -1722,7 +1739,10 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) src = (const uint8_t *)(rxdesc->addr & EMACRXD_ADDR_MASK); arch_invalidate_dcache((uintptr_t)src, (uintptr_t)src + copylen); - /* And do the copy */ + /* Copy the data from the driver managed the ring buffer. If we + * wanted to support zero copy transfers, we would need to make + * sure that dev->d_buf and rxdesc->addr refer to the same memory. + */ memcpy(dest, src, copylen); dest += copylen; @@ -1735,19 +1755,18 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) /* Frame size from the EMAC */ dev->d_len = (rxdesc->status & EMACRXD_STA_FRLEN_MASK); - nllvdbg("packet %d-%d (%d)\n", - priv->xfrq[qid].rxndx, rxndx, dev->d_len); + nllvdbg("packet %d-%d (%d)\n", xfrq->rxndx, rxndx, dev->d_len); /* All data have been copied in the application frame buffer, * release the RX descriptor(s). Loop until all descriptors * have been released up to the start of the next frame. */ - while (priv->xfrq[qid].rxndx != rxndx) + while (xfrq->rxndx != rxndx) { /* Give ownership back to the EMAC */ - rxdesc = &priv->xfrq[qid].rxdesc[priv->xfrq[qid].rxndx]; + rxdesc = &xfrq->rxdesc[xfrq->rxndx]; rxdesc->addr &= ~(EMACRXD_ADDR_OWNER); /* Flush the modified RX descriptor to RAM */ @@ -1760,9 +1779,9 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) * released. */ - if (++priv->xfrq[qid].rxndx >= priv->xfrq[qid].nrxbuffers) + if (++xfrq->rxndx >= xfrq->nrxbuffers) { - priv->xfrq[qid].rxndx = 0; + xfrq->rxndx = 0; } } @@ -1771,7 +1790,7 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) */ nllvdbg("rxndx: %d d_len: %d\n", - priv->xfrq[qid].rxndx, dev->d_len); + xfrq->rxndx, dev->d_len); if (pktlen < dev->d_len) { nlldbg("ERROR: Buffer size %d; frame size %d\n", @@ -1804,14 +1823,14 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) * Use it to update the candidate Start-of-Frame. */ - priv->xfrq[qid].rxndx = rxndx; + xfrq->rxndx = rxndx; } /* Set-up to process the next fragment. Get the RX descriptor * associated with the next fragment. */ - rxdesc = &priv->xfrq[qid].rxdesc[rxndx]; + rxdesc = &xfrq->rxdesc[rxndx]; /* Invalidate the RX descriptor to force re-fetching from RAM */ @@ -1821,8 +1840,8 @@ static int sam_recvframe(struct sam_emac_s *priv, int qid) /* No packet was found */ - priv->xfrq[qid].rxndx = rxndx; - nllvdbg("Exit rxndx[%d]: %d\n", qid, priv->xfrq[qid].rxndx); + xfrq->rxndx = rxndx; + nllvdbg("Exit rxndx[%d]: %d\n", qid, xfrq->rxndx); return -EAGAIN; } @@ -2000,6 +2019,7 @@ static void sam_receive(struct sam_emac_s *priv, int qid) static void sam_txdone(struct sam_emac_s *priv, int qid) { struct emac_txdesc_s *txdesc; + struct sam_queue_s *xfrq; uint16_t tail; /* Are there any outstanding transmissions? Loop until either (1) all of @@ -2007,12 +2027,14 @@ static void sam_txdone(struct sam_emac_s *priv, int qid) * first descriptor that is still in use by the hardware. */ - tail = priv->xfrq[qid].txtail; - while (tail != priv->xfrq[qid].txhead) + xfrq = &priv->xfrq[qid]; + tail = xfrq->txtail; + + while (tail != xfrq->txhead) { /* Yes.. check the next buffer at the tail of the list */ - txdesc = &priv->xfrq[qid].txdesc[tail]; + txdesc = &xfrq->txdesc[tail]; arch_invalidate_dcache((uintptr_t)txdesc, (uintptr_t)txdesc + sizeof(struct emac_txdesc_s)); @@ -2031,27 +2053,27 @@ static void sam_txdone(struct sam_emac_s *priv, int qid) /* Process all buffers of the current transmitted frame */ - while (tail != priv->xfrq[qid].txhead && + while (tail != xfrq->txhead && (txdesc->status & EMACTXD_STA_LAST) == 0) { /* Increment the tail index */ - if (++tail >= priv->xfrq[qid].ntxbuffers) + if (++tail >= xfrq->ntxbuffers) { tail = 0; } /* Get the next TX descriptor */ - txdesc = &priv->xfrq[qid].txdesc[tail]; + txdesc = &xfrq->txdesc[tail]; arch_invalidate_dcache((uintptr_t)txdesc, (uintptr_t)txdesc + sizeof(struct emac_txdesc_s)); } /* Go to first buffer of the next frame */ - if (tail != priv->xfrq[qid].txhead && - ++tail >= priv->xfrq[qid].ntxbuffers) + if (tail != xfrq->txhead && + ++tail >= xfrq->ntxbuffers) { tail = 0; } @@ -2066,7 +2088,7 @@ static void sam_txdone(struct sam_emac_s *priv, int qid) /* Save the new tail index */ - priv->xfrq[qid].txtail = tail; + xfrq->txtail = tail; /* Then poll uIP for new XMIT data */ @@ -2094,6 +2116,7 @@ static void sam_txdone(struct sam_emac_s *priv, int qid) static void sam_txerr_interrupt(FAR struct sam_emac_s *priv, int qid) { struct emac_txdesc_s *txdesc; + struct sam_queue_s *xfrq; uint32_t regval; uint16_t tail; @@ -2127,10 +2150,12 @@ static void sam_txerr_interrupt(FAR struct sam_emac_s *priv, int qid) /* Treat frames in TX queue including the ones that caused the error. */ - tail = priv->xfrq[qid].txtail; - while (tail != priv->xfrq[qid].txhead) + xfrq = &priv->xfrq[qid]; + tail = xfrq->txtail; + + while (tail != xfrq->txhead) { - txdesc = &priv->xfrq[qid].txdesc[tail]; + txdesc = &xfrq->txdesc[tail]; /* Make H/W updates to the TX descriptor visible to the CPU. */ @@ -2139,27 +2164,27 @@ static void sam_txerr_interrupt(FAR struct sam_emac_s *priv, int qid) /* Go to the last buffer descriptor of the frame */ - while (tail != priv->xfrq[qid].txhead && + while (tail != xfrq->txhead && (txdesc->status & EMACTXD_STA_LAST) == 0) { /* Increment the tail index */ - if (++tail >= priv->xfrq[qid].ntxbuffers) + if (++tail >= xfrq->ntxbuffers) { tail = 0; } /* Get the next TX descriptor */ - txdesc = &priv->xfrq[qid].txdesc[tail]; + txdesc = &xfrq->txdesc[tail]; arch_invalidate_dcache((uintptr_t)txdesc, (uintptr_t)txdesc + sizeof(struct emac_txdesc_s)); } /* Go to first buffer of the next frame */ - if (tail != priv->xfrq[qid].txhead && - ++tail >= priv->xfrq[qid].ntxbuffers) + if (tail != xfrq->txhead && + ++tail >= xfrq->ntxbuffers) { tail = 0; } @@ -2167,7 +2192,7 @@ static void sam_txerr_interrupt(FAR struct sam_emac_s *priv, int qid) /* Save the new tail index */ - priv->xfrq[qid].txtail = tail; + xfrq->txtail = tail; /* Reset TX queue */ @@ -4444,13 +4469,20 @@ static inline void sam_ethgpioconfig(struct sam_emac_s *priv) static void sam_txreset(struct sam_emac_s *priv, int qid) { - uint8_t *txbuffer = priv->xfrq[qid].txbuffer; - struct emac_txdesc_s *txdesc = priv->xfrq[qid].txdesc; + struct emac_txdesc_s *txdesc; + struct sam_queue_s *xfrq; + uint8_t *txbuffer; uintptr_t bufaddr; uintptr_t regaddr; uint32_t regval; int ndx; + /* Get some convenience pointers */ + + xfrq = &priv->xfrq[qid]; + txdesc = xfrq->txdesc; + txbuffer = xfrq->txbuffer; + /* Disable TX */ regval = sam_getreg(priv, SAM_EMAC_NCR_OFFSET); @@ -4459,12 +4491,12 @@ static void sam_txreset(struct sam_emac_s *priv, int qid) /* Configure the TX descriptors. */ - priv->xfrq[qid].txhead = 0; - priv->xfrq[qid].txtail = 0; + xfrq->txhead = 0; + xfrq->txtail = 0; - for (ndx = 0; ndx < priv->xfrq[qid].ntxbuffers; ndx++) + for (ndx = 0; ndx < xfrq->ntxbuffers; ndx++) { - bufaddr = (uintptr_t)&txbuffer[ndx * priv->xfrq[qid].txbufsize]; + bufaddr = (uintptr_t)&txbuffer[ndx * xfrq->txbufsize]; /* Set the buffer address and mark the descriptor as in used by firmware */ @@ -4474,14 +4506,14 @@ static void sam_txreset(struct sam_emac_s *priv, int qid) /* Mark the final descriptor in the list */ - txdesc[priv->xfrq[qid].ntxbuffers - 1].status = + txdesc[xfrq->ntxbuffers - 1].status = EMACTXD_STA_USED | EMACTXD_STA_WRAP; /* Flush the entire TX descriptor table to RAM */ arch_clean_dcache((uintptr_t)txdesc, (uintptr_t)txdesc + - priv->xfrq[qid].ntxbuffers * sizeof(struct emac_txdesc_s)); + xfrq->ntxbuffers * sizeof(struct emac_txdesc_s)); /* Set the Transmit Buffer Queue Pointer Register */ @@ -4508,13 +4540,20 @@ static void sam_txreset(struct sam_emac_s *priv, int qid) static void sam_rxreset(struct sam_emac_s *priv, int qid) { - struct emac_rxdesc_s *rxdesc = priv->xfrq[qid].rxdesc; - uint8_t *rxbuffer = priv->xfrq[qid].rxbuffer; + struct emac_rxdesc_s *rxdesc; + struct sam_queue_s *xfrq; + uint8_t *rxbuffer; uintptr_t bufaddr; uintptr_t regaddr; uint32_t regval; int ndx; + /* Get some convenience pointers */ + + xfrq = &priv->xfrq[qid]; + rxdesc = xfrq->rxdesc; + rxbuffer = xfrq->rxbuffer; + /* Disable RX */ regval = sam_getreg(priv, SAM_EMAC_NCR_OFFSET); @@ -4523,10 +4562,10 @@ static void sam_rxreset(struct sam_emac_s *priv, int qid) /* Configure the RX descriptors. */ - priv->xfrq[qid].rxndx = 0; + xfrq->rxndx = 0; for (ndx = 0; ndx < priv->attr->nrxbuffers; ndx++) { - bufaddr = (uintptr_t)&rxbuffer[ndx * priv->xfrq[qid].rxbufsize]; + bufaddr = (uintptr_t)&rxbuffer[ndx * xfrq->rxbufsize]; DEBUGASSERT((bufaddr & ~EMACRXD_ADDR_MASK) == 0); /* Set the buffer address and remove EMACRXD_ADDR_OWNER and |