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[Qemu-devel] [PULL 04/53] acpi: add build_append_named_dword, returning
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 04/53] acpi: add build_append_named_dword, returning an offset in buffer |
Date: |
Fri, 11 Mar 2016 17:07:39 +0200 |
This is a very limited form of support for runtime patching -
similar in functionality to what we can do with ACPI_EXTRACT
macros in python, but implemented in C.
This is to allow ACPI code direct access to data tables -
which is exactly what DataTableRegion is there for, except
no known windows release so far implements DataTableRegion.
Signed-off-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Xiao Guangrong <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
include/hw/acpi/aml-build.h | 3 +++
hw/acpi/aml-build.c | 28 ++++++++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index b16017e..66f48ec 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -368,4 +368,7 @@ void
build_rsdt(GArray *table_data, GArray *linker, GArray *table_offsets,
const char *oem_id, const char *oem_table_id);
+int
+build_append_named_dword(GArray *array, const char *name_format, ...);
+
#endif
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index f26fa26..ab89ca6 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -258,6 +258,34 @@ static void build_append_int(GArray *table, uint64_t value)
}
}
+/*
+ * Build NAME(XXXX, 0x00000000) where 0x00000000 is encoded as a dword,
+ * and return the offset to 0x00000000 for runtime patching.
+ *
+ * Warning: runtime patching is best avoided. Only use this as
+ * a replacement for DataTableRegion (for guests that don't
+ * support it).
+ */
+int
+build_append_named_dword(GArray *array, const char *name_format, ...)
+{
+ int offset;
+ va_list ap;
+
+ build_append_byte(array, 0x08); /* NameOp */
+ va_start(ap, name_format);
+ build_append_namestringv(array, name_format, ap);
+ va_end(ap);
+
+ build_append_byte(array, 0x0C); /* DWordPrefix */
+
+ offset = array->len;
+ build_append_int_noprefix(array, 0x00000000, 4);
+ assert(array->len == offset + 4);
+
+ return offset;
+}
+
static GPtrArray *alloc_list;
static Aml *aml_alloc(void)
--
MST
- [Qemu-devel] [PULL 00/53] vhost, virtio, pci, pc, acpi, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 01/53] acpi: add aml_create_field(), Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 02/53] acpi: add aml_concatenate(), Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 03/53] acpi: allow using object as offset for OperationRegion, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 04/53] acpi: add build_append_named_dword, returning an offset in buffer,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 06/53] hw/virtio: fix double use of a virtio flag, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 07/53] hw/virtio: group virtio flags into an enum, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 05/53] balloon: fix segfault and harden the stats queue, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 08/53] virtio-balloon: add 'available' counter, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 11/53] i386/acpi: make floppy controller object dynamic, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 10/53] pc-dimm: fix error handling in pc_dimm_check_memdev_is_busy(), Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 09/53] vhost-user: verify that number of queues is less than MAX_QUEUE_NUM, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 12/53] i386: expose floppy drive CMOS type, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 14/53] i386: populate floppy drive information in DSDT, Michael S. Tsirkin, 2016/03/11
- [Qemu-devel] [PULL 13/53] fdc: add function to determine drive chs limits, Michael S. Tsirkin, 2016/03/11