[Qemu-devel] [PATCH 6/8] hw: arm: Support both legacy and current RSDP build

[Samuel Ortiz <sameo@linux.intel.com>]

We add the ability to build legacy or current RSDP tables, based on the
AcpiRsdpData revision field passed to build_rsdp().
Although arm/virt only uses RSDP v2, adding that capability to
build_rsdp will allow us to share the RSDP build code between ARM and x86.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
---
 hw/arm/virt-acpi-build.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index d47978a55e..10f8388b63 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -389,6 +389,27 @@ build_rsdp(GArray *tbl, BIOSLinker *linker, AcpiRsdpData *rsdp_data)
     /* Space for the RSDT address (32 bit) */
     build_append_int_noprefix(tbl, 0, 4);
 
+    if (rsdp_data->rsdt_tbl_offset) {
+        /* RSDT address to be filled by guest linker */
+        bios_linker_loader_add_pointer(linker,
+                                       ACPI_BUILD_RSDP_FILE, 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, 0,
+                                    ACPI_RSDP_REV_1_LEN,
+                                    ACPI_RSDP_CHECKSUM_OFFSET);
+
+    if (rsdp_data->revision == ACPI_RSDP_REV_1) {
+        /* Legacy RSDP, we're done */
+        return;
+    }
+
+    /* The RSDP revision is 2 and later, we must have an XSDT pointer */
+    g_assert(rsdp_data->xsdt_tbl_offset != NULL);
+
     /* Length */
     build_append_int_noprefix(tbl, ACPI_RSDP_REV_2_LEN, ACPI_RSDP_LEN_LEN);
 
@@ -406,11 +427,6 @@ build_rsdp(GArray *tbl, BIOSLinker *linker, AcpiRsdpData *rsdp_data)
     /* Space for the reserved bytes */
     build_append_int_noprefix(tbl, 0, ACPI_RSDP_RESERVED_LEN);
 
-    /* Checksum to be filled by guest linker */
-    bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE, 0,
-                                    ACPI_RSDP_REV_1_LEN,
-                                    ACPI_RSDP_CHECKSUM_OFFSET);
-
     /* Extended checksum to be filled by Guest linker */
     bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE, 0,
                                     ACPI_RSDP_REV_2_LEN,
-- 
2.19.1