qemu/hw/ppc/fdt.c

/*
 * QEMU PowerPC helper routines for the device tree.
 *
 * Copyright (C) 2016 IBM Corp.
 *
 * This code is licensed under the GPL version 2 or later. See the
 * COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"
#include "target/ppc/cpu.h"
#include "target/ppc/mmu-hash64.h"

#include "hw/ppc/fdt.h"

#if defined(TARGET_PPC64)
size_t ppc_create_page_sizes_prop(PowerPCCPU *cpu, uint32_t *prop,
                                  size_t maxsize)
{
    size_t maxcells = maxsize / sizeof(uint32_t);
    int i, j, count;
    uint32_t *p = prop;

    for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
        PPCHash64SegmentPageSizes *sps = &cpu->hash64_opts->sps[i];

        if (!sps->page_shift) {
            break;
        }
        for (count = 0; count < PPC_PAGE_SIZES_MAX_SZ; count++) {
            if (sps->enc[count].page_shift == 0) {
                break;
            }
        }
        if ((p - prop) >= (maxcells - 3 - count * 2)) {
            break;
        }
        *(p++) = cpu_to_be32(sps->page_shift);
        *(p++) = cpu_to_be32(sps->slb_enc);
        *(p++) = cpu_to_be32(count);
        for (j = 0; j < count; j++) {
            *(p++) = cpu_to_be32(sps->enc[j].page_shift);
            *(p++) = cpu_to_be32(sps->enc[j].pte_enc);
        }
    }

    return (p - prop) * sizeof(uint32_t);
}
#endif