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[PATCH 20/53] acpi: build_rsdt: use acpi_init_table()/acpi_table_compose


From: Igor Mammedov
Subject: [PATCH 20/53] acpi: build_rsdt: use acpi_init_table()/acpi_table_composed() instead of build_header()
Date: Fri, 25 Jun 2021 05:17:45 -0400

it replaces error-prone pointer arithmetic for build_header() API,
with 2 calls to start and finish table creation,
which hides offests magic from API user.

While at it switch to build_append_int_noprefix() to build
entries to other tables (which also removes some manual offset
calculations).

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 include/hw/acpi/acpi-defs.h | 10 ----------
 hw/acpi/aml-build.c         | 27 ++++++++++++---------------
 2 files changed, 12 insertions(+), 25 deletions(-)

diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
index cf9f44299c..ccfa3382aa 100644
--- a/include/hw/acpi/acpi-defs.h
+++ b/include/hw/acpi/acpi-defs.h
@@ -149,16 +149,6 @@ struct AcpiSerialPortConsoleRedirection {
 typedef struct AcpiSerialPortConsoleRedirection
                AcpiSerialPortConsoleRedirection;
 
-/*
- * ACPI 1.0 Root System Description Table (RSDT)
- */
-struct AcpiRsdtDescriptorRev1 {
-    ACPI_TABLE_HEADER_DEF       /* ACPI common table header */
-    uint32_t table_offset_entry[];  /* Array of pointers to other */
-    /* ACPI tables */
-} QEMU_PACKED;
-typedef struct AcpiRsdtDescriptorRev1 AcpiRsdtDescriptorRev1;
-
 /*
  * ACPI 2.0 eXtended System Description Table (XSDT)
  */
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 576fc0238c..f7241ea5ec 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -1881,27 +1881,24 @@ build_rsdt(GArray *table_data, BIOSLinker *linker, 
GArray *table_offsets,
            const char *oem_id, const char *oem_table_id)
 {
     int i;
-    unsigned rsdt_entries_offset;
-    AcpiRsdtDescriptorRev1 *rsdt;
-    int rsdt_start = table_data->len;
-    const unsigned table_data_len = (sizeof(uint32_t) * table_offsets->len);
-    const unsigned rsdt_entry_size = sizeof(rsdt->table_offset_entry[0]);
-    const size_t rsdt_len = sizeof(*rsdt) + table_data_len;
-
-    rsdt = acpi_data_push(table_data, rsdt_len);
-    rsdt_entries_offset = (char *)rsdt->table_offset_entry - table_data->data;
+    AcpiTable table = { .sig = "RSDT", .rev = 1,
+                        .oem_id = oem_id, .oem_table_id = oem_table_id };
+
+    acpi_init_table(&table, table_data);
     for (i = 0; i < table_offsets->len; ++i) {
         uint32_t ref_tbl_offset = g_array_index(table_offsets, uint32_t, i);
-        uint32_t rsdt_entry_offset = rsdt_entries_offset + rsdt_entry_size * i;
+        uint32_t rsdt_entry_offset = table.array->len;
+
+        /* reserve space for entry */
+        build_append_int_noprefix(table.array, 0, 4);
 
-        /* rsdt->table_offset_entry to be filled by Guest linker */
+        /* mark position of RSDT entry to be filled by Guest linker */
         bios_linker_loader_add_pointer(linker,
-            ACPI_BUILD_TABLE_FILE, rsdt_entry_offset, rsdt_entry_size,
+            ACPI_BUILD_TABLE_FILE, rsdt_entry_offset, 4,
             ACPI_BUILD_TABLE_FILE, ref_tbl_offset);
+
     }
-    build_header(linker, table_data,
-                 (void *)(table_data->data + rsdt_start),
-                 "RSDT", rsdt_len, 1, oem_id, oem_table_id);
+    acpi_table_composed(linker, &table);
 }
 
 /* Build xsdt table */
-- 
2.27.0




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