target-sparc: implement auto-demapping for UA2005 CPUs

{

    unsigned int i, replace_used;

    if (cpu_has_hypervisor(env1)) {

        uint64_t new_vaddr = tlb_tag & ~0x1fffULL;

        uint64_t new_size = 8192ULL << 3 * TTE_PGSIZE(tlb_tte);

        uint32_t new_ctx = tlb_tag & 0x1fffU;

        for (i = 0; i < 64; i++) {

            uint32_t ctx = tlb[i].tag & 0x1fffU;

            /* check if new mapping overlaps an existing one */

            if (new_ctx == ctx) {

                uint64_t vaddr = tlb[i].tag & ~0x1fffULL;

                uint64_t size = 8192ULL << 3 * TTE_PGSIZE(tlb[i].tte);

                if (new_vaddr == vaddr

                    || (new_vaddr < vaddr + size

                        && vaddr < new_vaddr + new_size)) {

                    DPRINTF_MMU("auto demap entry [%d] %lx->%lx\n", i, vaddr,

                                new_vaddr);

                    replace_tlb_entry(&tlb[i], tlb_tag, tlb_tte, env1);

                    return;

                }

            }

        }

    }

    /* Try replacing invalid entry */

    for (i = 0; i < 64; i++) {

        if (!TTE_IS_VALID(tlb[i].tte)) {