]>
Commit | Line | Data |
---|---|---|
4b6cfb2a GK |
1 | #include <asm/byteorder.h> |
2 | #include "vphn.h" | |
3 | ||
4 | /* | |
5 | * Convert the associativity domain numbers returned from the hypervisor | |
6 | * to the sequence they would appear in the ibm,associativity property. | |
7 | */ | |
8 | int vphn_unpack_associativity(const long *packed, __be32 *unpacked) | |
9 | { | |
10 | __be64 be_packed[VPHN_REGISTER_COUNT]; | |
11 | int i, nr_assoc_doms = 0; | |
12 | const __be16 *field = (const __be16 *) be_packed; | |
13 | ||
14 | #define VPHN_FIELD_UNUSED (0xffff) | |
15 | #define VPHN_FIELD_MSB (0x8000) | |
16 | #define VPHN_FIELD_MASK (~VPHN_FIELD_MSB) | |
17 | ||
18 | /* Let's recreate the original stream. */ | |
19 | for (i = 0; i < VPHN_REGISTER_COUNT; i++) | |
20 | be_packed[i] = cpu_to_be64(packed[i]); | |
21 | ||
22 | for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) { | |
23 | if (be16_to_cpup(field) == VPHN_FIELD_UNUSED) { | |
24 | /* All significant fields processed, and remaining | |
25 | * fields contain the reserved value of all 1's. | |
26 | * Just store them. | |
27 | */ | |
28 | unpacked[i] = *((__be32 *)field); | |
29 | field += 2; | |
30 | } else if (be16_to_cpup(field) & VPHN_FIELD_MSB) { | |
31 | /* Data is in the lower 15 bits of this field */ | |
32 | unpacked[i] = cpu_to_be32( | |
33 | be16_to_cpup(field) & VPHN_FIELD_MASK); | |
34 | field++; | |
35 | nr_assoc_doms++; | |
36 | } else { | |
37 | /* Data is in the lower 15 bits of this field | |
38 | * concatenated with the next 16 bit field | |
39 | */ | |
40 | unpacked[i] = *((__be32 *)field); | |
41 | field += 2; | |
42 | nr_assoc_doms++; | |
43 | } | |
44 | } | |
45 | ||
46 | /* The first cell contains the length of the property */ | |
47 | unpacked[0] = cpu_to_be32(nr_assoc_doms); | |
48 | ||
49 | return nr_assoc_doms; | |
50 | } |