On Wed, Jun 28, 2017 at 08:00:21PM +0100, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilb...@redhat.com>
>
> Utility to give the offset of a host pointer within a RAMBlock
> (assuming we already know it's in that RAMBlock)
>
> Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
> ---
> exec.c | 6 ++++++
> include/exec/cpu-common.h | 1 +
> 2 files changed, 7 insertions(+)
>
> diff --git a/exec.c b/exec.c
> index 4e61226a16..a1499b9bee 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -2218,6 +2218,12 @@ static void *qemu_ram_ptr_length(RAMBlock *ram_block,
> ram_addr_t addr,
> return ramblock_ptr(block, addr);
> }
>
> +/* Return the offset of a hostpointer within a ramblock */
> +ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host)
> +{
> + return (uint8_t *)host - (uint8_t *)rb->host;
> +}
> +
I'd also assert that it's within that block.
> /*
> * Translates a host ptr back to a RAMBlock, a ram_addr and an offset
> * in that RAMBlock.
> diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
> index 4af179b543..fa1ec22d66 100644
> --- a/include/exec/cpu-common.h
> +++ b/include/exec/cpu-common.h
> @@ -66,6 +66,7 @@ ram_addr_t qemu_ram_addr_from_host(void *ptr);
> RAMBlock *qemu_ram_block_by_name(const char *name);
> RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
> ram_addr_t *offset);
> +ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host);
> void qemu_ram_set_idstr(RAMBlock *block, const char *name, DeviceState *dev);
> void qemu_ram_unset_idstr(RAMBlock *block);
> const char *qemu_ram_get_idstr(RAMBlock *rb);
> --
> 2.13.0
