1 /* $NetBSD: nouveau_nvkm_engine_disp_hdmi.c,v 1.2 2021/12/18 23:45:35 riastradh Exp $ */ 2 3 // SPDX-License-Identifier: MIT 4 #include <sys/cdefs.h> 5 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_engine_disp_hdmi.c,v 1.2 2021/12/18 23:45:35 riastradh Exp $"); 6 7 #include "hdmi.h" 8 pack_hdmi_infoframe(struct packed_hdmi_infoframe * packed_frame,u8 * raw_frame,ssize_t len)9void pack_hdmi_infoframe(struct packed_hdmi_infoframe *packed_frame, 10 u8 *raw_frame, ssize_t len) 11 { 12 u32 header = 0; 13 u32 subpack0_low = 0; 14 u32 subpack0_high = 0; 15 u32 subpack1_low = 0; 16 u32 subpack1_high = 0; 17 18 switch (len) { 19 /* 20 * "When in doubt, use brute force." 21 * -- Ken Thompson. 22 */ 23 default: 24 /* 25 * We presume that no valid frame is longer than 17 26 * octets, including header... And truncate to that 27 * if it's longer. 28 */ 29 case 17: 30 subpack1_high = (raw_frame[16] << 16); 31 /* fall through */ 32 case 16: 33 subpack1_high |= (raw_frame[15] << 8); 34 /* fall through */ 35 case 15: 36 subpack1_high |= raw_frame[14]; 37 /* fall through */ 38 case 14: 39 subpack1_low = (raw_frame[13] << 24); 40 /* fall through */ 41 case 13: 42 subpack1_low |= (raw_frame[12] << 16); 43 /* fall through */ 44 case 12: 45 subpack1_low |= (raw_frame[11] << 8); 46 /* fall through */ 47 case 11: 48 subpack1_low |= raw_frame[10]; 49 /* fall through */ 50 case 10: 51 subpack0_high = (raw_frame[9] << 16); 52 /* fall through */ 53 case 9: 54 subpack0_high |= (raw_frame[8] << 8); 55 /* fall through */ 56 case 8: 57 subpack0_high |= raw_frame[7]; 58 /* fall through */ 59 case 7: 60 subpack0_low = (raw_frame[6] << 24); 61 /* fall through */ 62 case 6: 63 subpack0_low |= (raw_frame[5] << 16); 64 /* fall through */ 65 case 5: 66 subpack0_low |= (raw_frame[4] << 8); 67 /* fall through */ 68 case 4: 69 subpack0_low |= raw_frame[3]; 70 /* fall through */ 71 case 3: 72 header = (raw_frame[2] << 16); 73 /* fall through */ 74 case 2: 75 header |= (raw_frame[1] << 8); 76 /* fall through */ 77 case 1: 78 header |= raw_frame[0]; 79 /* fall through */ 80 case 0: 81 break; 82 } 83 84 packed_frame->header = header; 85 packed_frame->subpack0_low = subpack0_low; 86 packed_frame->subpack0_high = subpack0_high; 87 packed_frame->subpack1_low = subpack1_low; 88 packed_frame->subpack1_high = subpack1_high; 89 } 90