1 files changed, 68 insertions, 0 deletions
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 1e43cd7..555c24f 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -1589,6 +1589,74 @@ void acpi_build_tables_cleanup(AcpiBuildTables *tables, bool mfre)
     g_array_free(tables->vmgenid, mfre);
 }
 
+/*
+ * ACPI spec 5.2.5.3 Root System Description Pointer (RSDP).
+ * (Revision 1.0 or later)
+ */
+void
+build_rsdp(GArray *tbl, BIOSLinker *linker, AcpiRsdpData *rsdp_data)
+{
+    int tbl_off = tbl->len; /* Table offset in the RSDP file */
+
+    switch (rsdp_data->revision) {
+    case 0:
+        /* With ACPI 1.0, we must have an RSDT pointer */
+        g_assert(rsdp_data->rsdt_tbl_offset);
+        break;
+    case 2:
+        /* With ACPI 2.0+, we must have an XSDT pointer */
+        g_assert(rsdp_data->xsdt_tbl_offset);
+        break;
+    default:
+        /* Only revisions 0 (ACPI 1.0) and 2 (ACPI 2.0+) are valid for RSDP */
+        g_assert_not_reached();
+    }
+
+    bios_linker_loader_alloc(linker, ACPI_BUILD_RSDP_FILE, tbl, 16,
+                             true /* fseg memory */);
+
+    g_array_append_vals(tbl, "RSD PTR ", 8); /* Signature */
+    build_append_int_noprefix(tbl, 0, 1); /* Checksum */
+    g_array_append_vals(tbl, rsdp_data->oem_id, 6); /* OEMID */
+    build_append_int_noprefix(tbl, rsdp_data->revision, 1); /* Revision */
+    build_append_int_noprefix(tbl, 0, 4); /* RsdtAddress */
+    if (rsdp_data->rsdt_tbl_offset) {
+        /* RSDT address to be filled by guest linker */
+        bios_linker_loader_add_pointer(linker, ACPI_BUILD_RSDP_FILE,
+                                       tbl_off + 16, 4,
+                                       ACPI_BUILD_TABLE_FILE,
+                                       *rsdp_data->rsdt_tbl_offset);
+    }
+
+    /* Checksum to be filled by guest linker */
+    bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE,
+                                    tbl_off, 20, /* ACPI rev 1.0 RSDP size */
+                                    8);
+
+    if (rsdp_data->revision == 0) {
+        /* ACPI 1.0 RSDP, we're done */
+        return;
+    }
+
+    build_append_int_noprefix(tbl, 36, 4); /* Length */
+
+    /* XSDT address to be filled by guest linker */
+    build_append_int_noprefix(tbl, 0, 8); /* XsdtAddress */
+    /* We already validated our xsdt pointer */
+    bios_linker_loader_add_pointer(linker, ACPI_BUILD_RSDP_FILE,
+                                   tbl_off + 24, 8,
+                                   ACPI_BUILD_TABLE_FILE,
+                                   *rsdp_data->xsdt_tbl_offset);
+
+    build_append_int_noprefix(tbl, 0, 1); /* Extended Checksum */
+    build_append_int_noprefix(tbl, 0, 3); /* Reserved */
+
+    /* Extended checksum to be filled by Guest linker */
+    bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE,
+                                    tbl_off, 36, /* ACPI rev 2.0 RSDP size */
+                                    32);
+}
+
 /* Build rsdt table */
 void
 build_rsdt(GArray *table_data, BIOSLinker *linker, GArray *table_offsets,