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qemu_ram_block_host_offset

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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 <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-03-12 17:20:57 +00:00 committed by Michael S. Tsirkin
parent db144f7000
commit f90bb71bfd
2 changed files with 11 additions and 0 deletions
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10
exec.c
View File

@ -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.

1
include/exec/cpu-common.h
View File

@ -68,6 +68,7 @@ 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);