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Re: [Qemu-devel] [PATCH] 64 bit I/O v3
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] [PATCH] 64 bit I/O v3 |
Date: |
Thu, 26 Feb 2009 21:07:02 +0200 |
On 2/26/09, Robert Reif <address@hidden> wrote:
> This is the third version of adding 64 bit I/O support to QEMU.
> int cpu_register_io_memory(int io_index,
> CPUReadMemoryFunc **mem_read,
> CPUWriteMemoryFunc **mem_write,
> void *opaque)
> {
> - int i, subwidth = 0;
> + if (io_index <= 0) {
> + io_index = get_free_io_mem_idx();
> + if (io_index == -1)
> + return io_index;
> + } else {
> + if (io_index >= IO_MEM_NB_ENTRIES)
> + return -1;
> + }
>
> + io_mem_read[io_index].b = mem_read[0];
> + io_mem_write[io_index].b = mem_write[0];
> +
> + io_mem_read[io_index].w = mem_read[1];
> + io_mem_write[io_index].w = mem_write[1];
> +
> + io_mem_read[io_index].l = mem_read[2];
> + io_mem_write[io_index].l = mem_write[2];
> +
> + io_mem_read[io_index].q = NULL;
> + io_mem_write[io_index].q = NULL;
> +
> + io_mem_opaque[io_index] = opaque;
> + return (io_index << IO_MEM_SHIFT) | IO_MEM_SUBWIDTH;
> +}
I think for 64 bit accesses the default should be emulation using two
32 bit accesses instead of NULL (unassigned).