kbind implementation: sparc64

• Copy new data into buffer in kernel

• for each block:

  • uvm_map_extract(map, baseva, PAGE_SIZE, &kva, UVM_EXTRACT_FIXPROT)

    • force copy-on-write resolution

    • map that userspace VA into the kernel map, with max permitted permissions

  • bcopy(buffer, kva + offset, len)

    • update the page via the kernel mapping

    • actually use word-sized writes

  • uvm_unmap_remove(kernel_map, kva, kva+PAGE_SIZE, &dead_entries, FALSE, TRUE)

    • remove the page from the kernel map

• uvm_unmap_detach(&dead_entries, AMAP_REFALL)

  • clean up/release references to backing objects