hw/ppc/fdt.c

   1 /*
   2  * QEMU PowerPC helper routines for the device tree.
   3  *
   4  * Copyright (C) 2016 IBM Corp.
   5  *
   6  * This code is licensed under the GPL version 2 or later. See the
   7  * COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "target/ppc/cpu.h"
  12 #include "target/ppc/mmu-hash64.h"
  13
  14 #include "hw/ppc/fdt.h"
  15
  16 #if defined(TARGET_PPC64)
  17 size_t ppc_create_page_sizes_prop(PowerPCCPU *cpu, uint32_t *prop,
  18                                   size_t maxsize)
  19 {
  20     size_t maxcells = maxsize / sizeof(uint32_t);
  21     int i, j, count;
  22     uint32_t *p = prop;
  23
  24     for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
  25         PPCHash64SegmentPageSizes *sps = &cpu->hash64_opts->sps[i];
  26
  27         if (!sps->page_shift) {
  28             break;
  29         }
  30         for (count = 0; count < PPC_PAGE_SIZES_MAX_SZ; count++) {
  31             if (sps->enc[count].page_shift == 0) {
  32                 break;
  33             }
  34         }
  35         if ((p - prop) >= (maxcells - 3 - count * 2)) {
  36             break;
  37         }
  38         *(p++) = cpu_to_be32(sps->page_shift);
  39         *(p++) = cpu_to_be32(sps->slb_enc);
  40         *(p++) = cpu_to_be32(count);
  41         for (j = 0; j < count; j++) {
  42             *(p++) = cpu_to_be32(sps->enc[j].page_shift);
  43             *(p++) = cpu_to_be32(sps->enc[j].pte_enc);
  44         }
  45     }
  46
  47     return (p - prop) * sizeof(uint32_t);
  48 }
  49 #endif