Hi David,
On 08/24/2017 04:27 PM, 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 | 10 ++++++++++
include/exec/cpu-common.h | 1 +
2 files changed, 11 insertions(+)
diff --git a/exec.c b/exec.c
index 67df2909ce..35b4cea2ed 100644
--- a/exec.c
+++ b/exec.c
@@ -2231,6 +2231,16 @@ 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;
What about using ptrdiff_t here,
+ assert((uint8_t *)host >= (uint8_t *)rb->host);
and uintptr_t here?
+ assert(res < rb->max_length);
+
+ return res;
+}
+
/*
* 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 74341b19d2..0d861a6289 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -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);
