| Greg Kurz | 4b6cfb2 | 2015-02-23 16:14:31 +0100 | [diff] [blame^] | 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 | } |