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Linux/tools/testing/selftests/powerpc/vphn/vphn.c

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  1 #include <asm/byteorder.h>
  2 #include "vphn.h"
  3 
  4 /*
  5  * The associativity domain numbers are returned from the hypervisor as a
  6  * stream of mixed 16-bit and 32-bit fields. The stream is terminated by the
  7  * special value of "all ones" (aka. 0xffff) and its size may not exceed 48
  8  * bytes.
  9  *
 10  *    --- 16-bit fields -->
 11  *  _________________________
 12  *  |  0  |  1  |  2  |  3  |   be_packed[0]
 13  *  ------+-----+-----+------
 14  *  _________________________
 15  *  |  4  |  5  |  6  |  7  |   be_packed[1]
 16  *  -------------------------
 17  *            ...
 18  *  _________________________
 19  *  | 20  | 21  | 22  | 23  |   be_packed[5]
 20  *  -------------------------
 21  *
 22  * Convert to the sequence they would appear in the ibm,associativity property.
 23  */
 24 int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
 25 {
 26         __be64 be_packed[VPHN_REGISTER_COUNT];
 27         int i, nr_assoc_doms = 0;
 28         const __be16 *field = (const __be16 *) be_packed;
 29         u16 last = 0;
 30         bool is_32bit = false;
 31 
 32 #define VPHN_FIELD_UNUSED       (0xffff)
 33 #define VPHN_FIELD_MSB          (0x8000)
 34 #define VPHN_FIELD_MASK         (~VPHN_FIELD_MSB)
 35 
 36         /* Let's fix the values returned by plpar_hcall9() */
 37         for (i = 0; i < VPHN_REGISTER_COUNT; i++)
 38                 be_packed[i] = cpu_to_be64(packed[i]);
 39 
 40         for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) {
 41                 u16 new = be16_to_cpup(field++);
 42 
 43                 if (is_32bit) {
 44                         /* Let's concatenate the 16 bits of this field to the
 45                          * 15 lower bits of the previous field
 46                          */
 47                         unpacked[++nr_assoc_doms] =
 48                                 cpu_to_be32(last << 16 | new);
 49                         is_32bit = false;
 50                 } else if (new == VPHN_FIELD_UNUSED)
 51                         /* This is the list terminator */
 52                         break;
 53                 else if (new & VPHN_FIELD_MSB) {
 54                         /* Data is in the lower 15 bits of this field */
 55                         unpacked[++nr_assoc_doms] =
 56                                 cpu_to_be32(new & VPHN_FIELD_MASK);
 57                 } else {
 58                         /* Data is in the lower 15 bits of this field
 59                          * concatenated with the next 16 bit field
 60                          */
 61                         last = new;
 62                         is_32bit = true;
 63                 }
 64         }
 65 
 66         /* The first cell contains the length of the property */
 67         unpacked[0] = cpu_to_be32(nr_assoc_doms);
 68 
 69         return nr_assoc_doms;
 70 }
 71 

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