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[v7,13/23] hw/acpi/aml-build: Make aml_buffer() definition consistent with the spec

Message ID 1431595182-7552-14-git-send-email-zhaoshenglong@huawei.com
State New
Headers show

Commit Message

Shannon Zhao May 14, 2015, 9:19 a.m. UTC 
From: Shannon Zhao <shannon.zhao@linaro.org>

According to ACPI spec, DefBuffer can take two parameters: BufferSize
and ByteList. Make it consistent with the spec. If we want to request
uninitialized buffer, pass ByteList as NULL to aml_buffer() to
reserve spaces.

Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 hw/acpi/aml-build.c         | 15 ++++++++++++++-
 include/hw/acpi/aml-build.h |  2 +-
 2 files changed, 15 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index b0e1dbc..6197896 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -636,9 +636,22 @@  Aml *aml_resource_template(void)
 }
 
 /* ACPI 1.0b: 16.2.5.4 Type 2 Opcodes Encoding: DefBuffer */
-Aml *aml_buffer(void)
+Aml *aml_buffer(int buffer_size, uint8_t *byte_list)
 {
+    int i;
     Aml *var = aml_bundle(0x11 /* BufferOp */, AML_BUFFER);
+
+    for (i = 0; i < buffer_size; i++) {
+        /* (byte_list == NULL) means requesting uninitialized buffer, only
+         * need to reserve spaces.
+         */
+        if (byte_list == NULL) {
+            build_append_byte(var->buf, 0x0);
+        } else {
+            build_append_byte(var->buf, *(byte_list + i));
+        }
+    }
+
     return var;
 }
 
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index dd3b317..615f3c1 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -261,7 +261,7 @@  Aml *aml_device(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
 Aml *aml_method(const char *name, int arg_count);
 Aml *aml_if(Aml *predicate);
 Aml *aml_package(uint8_t num_elements);
-Aml *aml_buffer(void);
+Aml *aml_buffer(int buffer_size, uint8_t *byte_list);
 Aml *aml_resource_template(void);
 Aml *aml_field(const char *name, AmlAccessType type, AmlUpdateRule rule);
 Aml *aml_varpackage(uint32_t num_elements);