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
  13 #include "hw/ppc/fdt.h"
  14
  15 #if defined(TARGET_PPC64)
  16 size_t ppc_create_page_sizes_prop(CPUPPCState *env, uint32_t *prop,
  17                                      size_t maxsize)
  18 {
  19     size_t maxcells = maxsize / sizeof(uint32_t);
  20     int i, j, count;
  21     uint32_t *p = prop;
  22
  23     for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
  24         struct ppc_one_seg_page_size *sps = &env->sps.sps[i];
  25
  26         if (!sps->page_shift) {
  27             break;
  28         }
  29         for (count = 0; count < PPC_PAGE_SIZES_MAX_SZ; count++) {
  30             if (sps->enc[count].page_shift == 0) {
  31                 break;
  32             }
  33         }
  34         if ((p - prop) >= (maxcells - 3 - count * 2)) {
  35             break;
  36         }
  37         *(p++) = cpu_to_be32(sps->page_shift);
  38         *(p++) = cpu_to_be32(sps->slb_enc);
  39         *(p++) = cpu_to_be32(count);
  40         for (j = 0; j < count; j++) {
  41             *(p++) = cpu_to_be32(sps->enc[j].page_shift);
  42             *(p++) = cpu_to_be32(sps->enc[j].pte_enc);
  43         }
  44     }
  45
  46     return (p - prop) * sizeof(uint32_t);
  47 }
  48 #endif