1 /* 2 * udebug - debug ring buffer library 3 * 4 * Copyright (C) 2023 Felix Fietkau <nbd@nbd.name> 5 * 6 * Permission to use, copy, modify, and/or distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 #ifndef __UDEBUG_PROTO_H 19 #define __UDEBUG_PROTO_H 20 21 #include "udebug.h" 22 23 struct udebug_hdr { 24 uint32_t ring_size; 25 uint32_t data_size; 26 27 uint32_t format; 28 uint32_t sub_format; 29 30 uintptr_t flags[8 / sizeof(uintptr_t)]; 31 uintptr_t notify; 32 33 uint32_t head_hi; 34 uint32_t head; 35 uint32_t data_head; 36 uint32_t data_used; 37 }; 38 39 enum udebug_client_msg_type { 40 CL_MSG_RING_ADD, 41 CL_MSG_RING_REMOVE, 42 CL_MSG_RING_NOTIFY, 43 CL_MSG_GET_HANDLE, 44 CL_MSG_RING_GET, 45 CL_MSG_ERROR, 46 }; 47 48 struct udebug_client_msg { 49 uint8_t type; 50 uint8_t _pad[3]; 51 uint32_t id; 52 union { 53 struct { 54 uint32_t ring_size, data_size; 55 }; 56 uint32_t notify_mask; 57 }; 58 } __attribute__((packed, aligned(4))); 59 60 static inline struct udebug_ptr * 61 udebug_ring_ptr(struct udebug_hdr *hdr, uint32_t idx) 62 { 63 struct udebug_ptr *ring = (struct udebug_ptr *)&hdr[1]; 64 return &ring[idx & (hdr->ring_size - 1)]; 65 } 66 67 static inline void *udebug_buf_ptr(struct udebug_buf *buf, uint32_t ofs) 68 { 69 return buf->data + (ofs & (buf->data_size - 1)); 70 } 71 72 #endif 73
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