LXR qemu/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)
  16size_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
  49