From f90bb71bfdaca6ece1696e194aad11fb8599ffba Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Mon, 12 Mar 2018 17:20:57 +0000 Subject: qemu_ram_block_host_offset 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 Reviewed-by: Peter Xu Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- exec.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'exec.c') diff --git a/exec.c b/exec.c index 34fdfd966e..2199b093bd 100644 --- a/exec.c +++ b/exec.c @@ -2297,6 +2297,16 @@ 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) +{ + ram_addr_t res = (uint8_t *)host - (uint8_t *)rb->host; + assert((uintptr_t)host >= (uintptr_t)rb->host); + assert(res < rb->max_length); + + return res; +} + /* * Translates a host ptr back to a RAMBlock, a ram_addr and an offset * in that RAMBlock. -- cgit v1.2.1