cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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descs_com.h (3363B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*******************************************************************************
      3  Header File to describe Normal/enhanced descriptor functions used for RING
      4  and CHAINED modes.
      5
      6  Copyright(C) 2011  STMicroelectronics Ltd
      7
      8  It defines all the functions used to handle the normal/enhanced
      9  descriptors in case of the DMA is configured to work in chained or
     10  in ring mode.
     11
     12
     13  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
     14*******************************************************************************/
     15
     16#ifndef __DESC_COM_H__
     17#define __DESC_COM_H__
     18
     19/* Specific functions used for Ring mode */
     20
     21/* Enhanced descriptors */
     22static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end,
     23					   int bfsize)
     24{
     25	if (bfsize == BUF_SIZE_16KiB)
     26		p->des1 |= cpu_to_le32((BUF_SIZE_8KiB
     27				<< ERDES1_BUFFER2_SIZE_SHIFT)
     28			   & ERDES1_BUFFER2_SIZE_MASK);
     29
     30	if (end)
     31		p->des1 |= cpu_to_le32(ERDES1_END_RING);
     32}
     33
     34static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end)
     35{
     36	if (end)
     37		p->des0 |= cpu_to_le32(ETDES0_END_RING);
     38	else
     39		p->des0 &= cpu_to_le32(~ETDES0_END_RING);
     40}
     41
     42static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
     43{
     44	if (unlikely(len > BUF_SIZE_4KiB)) {
     45		p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB)
     46					<< ETDES1_BUFFER2_SIZE_SHIFT)
     47			    & ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB
     48			    & ETDES1_BUFFER1_SIZE_MASK));
     49	} else
     50		p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK));
     51}
     52
     53/* Normal descriptors */
     54static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end, int bfsize)
     55{
     56	if (bfsize >= BUF_SIZE_2KiB) {
     57		int bfsize2;
     58
     59		bfsize2 = min(bfsize - BUF_SIZE_2KiB + 1, BUF_SIZE_2KiB - 1);
     60		p->des1 |= cpu_to_le32((bfsize2 << RDES1_BUFFER2_SIZE_SHIFT)
     61			    & RDES1_BUFFER2_SIZE_MASK);
     62	}
     63
     64	if (end)
     65		p->des1 |= cpu_to_le32(RDES1_END_RING);
     66}
     67
     68static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end)
     69{
     70	if (end)
     71		p->des1 |= cpu_to_le32(TDES1_END_RING);
     72	else
     73		p->des1 &= cpu_to_le32(~TDES1_END_RING);
     74}
     75
     76static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
     77{
     78	if (unlikely(len > BUF_SIZE_2KiB)) {
     79		unsigned int buffer1 = (BUF_SIZE_2KiB - 1)
     80					& TDES1_BUFFER1_SIZE_MASK;
     81		p->des1 |= cpu_to_le32((((len - buffer1)
     82					<< TDES1_BUFFER2_SIZE_SHIFT)
     83				& TDES1_BUFFER2_SIZE_MASK) | buffer1);
     84	} else
     85		p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK));
     86}
     87
     88/* Specific functions used for Chain mode */
     89
     90/* Enhanced descriptors */
     91static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p)
     92{
     93	p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED);
     94}
     95
     96static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p)
     97{
     98	p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED);
     99}
    100
    101static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
    102{
    103	p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK);
    104}
    105
    106/* Normal descriptors */
    107static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)
    108{
    109	p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED);
    110}
    111
    112static inline void ndesc_tx_set_on_chain(struct dma_desc *p)
    113{
    114	p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);
    115}
    116
    117static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
    118{
    119	p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK);
    120}
    121#endif /* __DESC_COM_H__ */