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| author | Peter Maydell <peter.maydell@linaro.org> | 2018-08-24 18:04:22 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-10-02 19:09:14 +0200 |
| commit | 687ac05d71bbb3172e0546248e40483ef43a4813 (patch) | |
| tree | 8183148172c77f2be0532dc56a552126686a4c79 /docs/devel/memory.txt | |
| parent | 695e2fc2d64f272cec9e15b4e2a921ae303921b3 (diff) | |
| download | qemu-687ac05d71bbb3172e0546248e40483ef43a4813.zip qemu-687ac05d71bbb3172e0546248e40483ef43a4813.tar.gz qemu-687ac05d71bbb3172e0546248e40483ef43a4813.tar.bz2 | |
docs/devel/memory.txt: Document _with_attrs accessors
When we added the _with_attrs accessors we forgot to mention
them in the documentation.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20180824170422.5783-4-peter.maydell@linaro.org>
Based-on: <20180802174042.29234-1-peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'docs/devel/memory.txt')
| -rw-r--r-- | docs/devel/memory.txt | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/docs/devel/memory.txt b/docs/devel/memory.txt index 4fff0d5..42577e1 100644 --- a/docs/devel/memory.txt +++ b/docs/devel/memory.txt @@ -326,8 +326,15 @@ visible as the pci-hole alias clips it to a 0.5GB range. MMIO Operations --------------- -MMIO regions are provided with ->read() and ->write() callbacks; in addition -various constraints can be supplied to control how these callbacks are called: +MMIO regions are provided with ->read() and ->write() callbacks, +which are sufficient for most devices. Some devices change behaviour +based on the attributes used for the memory transaction, or need +to be able to respond that the access should provoke a bus error +rather than completing successfully; those devices can use the +->read_with_attrs() and ->write_with_attrs() callbacks instead. + +In addition various constraints can be supplied to control how these +callbacks are called: - .valid.min_access_size, .valid.max_access_size define the access sizes (in bytes) which the device accepts; accesses outside this range will |