Lines Matching +full:5 +full:- +full:byte
6 -----------------
10 One can memory-map a pointer to a carefully crafted struct over the hardware
23 were performed byte-by-byte. Also the code can easily get cluttered, and the
24 high-level idea might get lost among the many bit shifts required.
25 Many drivers take the bit-shifting approach and then attempt to reduce the
30 ------------
34 - Packing a CPU-usable number into a memory buffer (with hardware
36 - Unpacking a memory buffer (which has hardware constraints/quirks)
37 into a CPU-usable number.
44 perspective, bit 63 always means bit offset 7 of byte 7, albeit only
48 The byte offsets in the packed buffer are always implicitly 0, 1, ... 7.
56 7 6 5 4
57 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
60 That is, the MSByte (7) of the CPU-usable u64 sits at memory offset 0, and the
72 7 6 5 4
73 24 25 26 27 28 29 30 31 16 17 18 19 20 21 22 23 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7
76 That is, QUIRK_MSB_ON_THE_RIGHT does not affect byte positioning, but
77 inverts bit offsets inside a byte.
85 4 5 6 7
86 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24
90 byte from each 4-byte word is placed at its mirrored position compared to
99 4 5 6 7
100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
104 5. If just QUIRK_LSW32_IS_FIRST is set, we do it like this:
108 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
111 7 6 5 4
113 In this case the 8 byte memory region is interpreted as follows: first
114 4 bytes correspond to the least significant 4-byte word, next 4 bytes to
115 the more significant 4-byte word.
123 24 25 26 27 28 29 30 31 16 17 18 19 20 21 22 23 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7
126 7 6 5 4
134 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24
137 4 5 6 7
145 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
148 4 5 6 7
155 ------------
160 xxx_packing() that calls it using the proper QUIRK_* one-hot bits set.
162 The packing() function returns an int-encoded error code, which protects the