This ASL operator (and the underlying AML) enables named ACPI data tables
to be located from AML code, and to be accessed field-wise, like an
operation region. This is useful for passing down "parameter tables" to
the guest; the ACPI linker/loader can relocate pointers in them, and then
the AML code can read valid pointer values from the fields in the tables.
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Gal Hammer <gham...@redhat.com>
Cc: Igor Mammedov <imamm...@redhat.com>
Cc: "Michael S. Tsirkin" <m...@redhat.com>
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
include/hw/acpi/aml-build.h | 2 ++
hw/acpi/aml-build.c | 14 ++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index f8f96ec..dc4d215 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -225,6 +225,8 @@ Aml *aml_io(AmlIODecode dec, uint16_t min_base, uint16_t
max_base,
uint8_t aln, uint8_t len);
Aml *aml_operation_region(const char *name, AmlRegionSpace rs,
uint32_t offset, uint32_t len);
+Aml *aml_data_table_region(const char *name, Aml *sig, Aml *oem_id,
+ Aml *oem_table_id);
Aml *aml_irq_no_flags(uint8_t irq);
Aml *aml_named_field(const char *name, unsigned length);
Aml *aml_reserved_field(unsigned length);
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index a0f187e..2dd2f33 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -788,6 +788,20 @@ Aml *aml_operation_region(const char *name, AmlRegionSpace
rs,
return var;
}
+/* ACPI 2.0: 17.2.4.2 Named Objects Encoding: DefDataRegion */
+Aml *aml_data_table_region(const char *name, Aml *sig, Aml *oem_id,
+ Aml *oem_table_id)
+{
+ Aml *var = aml_alloc();
+ build_append_byte(var->buf, 0x5B); /* ExtOpPrefix */
+ build_append_byte(var->buf, 0x88); /* DataRegionOp */
+ build_append_namestring(var->buf, "%s", name);
+ aml_append(var, sig);
+ aml_append(var, oem_id);
+ aml_append(var, oem_table_id);
+ return var;
+}
+
/* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: NamedField */
Aml *aml_named_field(const char *name, unsigned length)
{
--
1.8.3.1
