Function rt_ioremap_early

libcpu/aarch64/common/mmu.c:702–734

}

void *rt_ioremap_early(void *paddr, size_t size)
{
    volatile size_t count;
    rt_ubase_t base;
    static void *tbl = RT_NULL;

    if (!size)
    {
        return RT_NULL;
    }

    if (!tbl)
    {
        tbl = rt_hw_mmu_tbl_get();
    }

    /* get the total size required including overhead for alignment */
    count = (size + ((rt_ubase_t)paddr & ARCH_SECTION_MASK)
            + ARCH_SECTION_MASK) >> ARCH_SECTION_SHIFT;
    base = (rt_ubase_t)paddr & (~ARCH_SECTION_MASK);

    while (count --> 0)
    {
        if (_map_single_page_2M(tbl, base, base, MMU_MAP_K_DEVICE, RT_TRUE))
        {
            return RT_NULL;
        }

        base += ARCH_SECTION_SIZE;
    }

    return paddr;
}

static int _init_map_2M(unsigned long *lv0_tbl, unsigned long va,
                        unsigned long pa, unsigned long count,