fdt_addresses.c

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// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
 * Copyright (C) 2018 embedded brains GmbH
 */
#include "libfdt_env.h"
 
#include <fdt.h>
#include <libfdt.h>
 
#include "libfdt_internal.h"
 
static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
{
    const fdt32_t *c;
    uint32_t val;
    int len;
 
    c = fdt_getprop(fdt, nodeoffset, name, &len);
    if (!c)
        return len;
 
    if (len != sizeof(*c))
        return -FDT_ERR_BADNCELLS;
 
    val = fdt32_to_cpu(*c);
    if (val > FDT_MAX_NCELLS)
        return -FDT_ERR_BADNCELLS;
 
    return (int)val;
}
 
int fdt_address_cells(const void *fdt, int nodeoffset)
{
    int val;
 
    val = fdt_cells(fdt, nodeoffset, "#address-cells");
    if (val == 0)
        return -FDT_ERR_BADNCELLS;
    if (val == -FDT_ERR_NOTFOUND)
        return 2;
    return val;
}
 
int fdt_size_cells(const void *fdt, int nodeoffset)
{
    int val;
 
    val = fdt_cells(fdt, nodeoffset, "#size-cells");
    if (val == -FDT_ERR_NOTFOUND)
        return 1;
    return val;
}
 
/* This function assumes that [address|size]_cells is 1 or 2 */
int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
                 const char *name, uint64_t addr, uint64_t size)
{
    int addr_cells, size_cells, ret;
    uint8_t data[sizeof(fdt64_t) * 2], *prop;
 
    ret = fdt_address_cells(fdt, parent);
    if (ret < 0)
        return ret;
    addr_cells = ret;
 
    ret = fdt_size_cells(fdt, parent);
    if (ret < 0)
        return ret;
    size_cells = ret;
 
    /* check validity of address */
    prop = data;
    if (addr_cells == 1) {
        if ((addr > UINT32_MAX) || (((uint64_t) UINT32_MAX + 1 - addr) < size))
            return -FDT_ERR_BADVALUE;
 
        fdt32_st(prop, (uint32_t)addr);
    } else if (addr_cells == 2) {
        fdt64_st(prop, addr);
    } else {
        return -FDT_ERR_BADNCELLS;
    }
 
    /* check validity of size */
    prop += addr_cells * sizeof(fdt32_t);
    if (size_cells == 1) {
        if (size > UINT32_MAX)
            return -FDT_ERR_BADVALUE;
 
        fdt32_st(prop, (uint32_t)size);
    } else if (size_cells == 2) {
        fdt64_st(prop, size);
    } else {
        return -FDT_ERR_BADNCELLS;
    }
 
    return fdt_appendprop(fdt, nodeoffset, name, data,
                  (addr_cells + size_cells) * sizeof(fdt32_t));
}