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Re: [Qemu-arm] [Qemu-devel] [PATCH v4 05/23] hw: arm: Switch to the AML


From: Shannon Zhao
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH v4 05/23] hw: arm: Switch to the AML build RSDP building routine
Date: Fri, 2 Nov 2018 17:35:06 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0



On 2018/11/1 18:22, Samuel Ortiz wrote:
We make the ARM virt ACPI code use the now shared build_rsdp() API from
aml-build.c. By doing so we fix a bug where the ARM implementation was
missing adding both the legacy and extended checksums, which was
building an invalid RSDP table.

Signed-off-by: Samuel Ortiz <address@hidden>
---
  hw/arm/virt-acpi-build.c | 31 +------------------------------
  1 file changed, 1 insertion(+), 30 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 0ed132b79b..0a6a88380a 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -35,6 +35,7 @@
  #include "target/arm/cpu.h"
  #include "hw/acpi/acpi-defs.h"
  #include "hw/acpi/acpi.h"
+#include "hw/acpi/aml-build.h"
  #include "hw/nvram/fw_cfg.h"
  #include "hw/acpi/bios-linker-loader.h"
  #include "hw/loader.h"
@@ -366,36 +367,6 @@ static void acpi_dsdt_add_power_button(Aml *scope)
      aml_append(scope, dev);
  }
-/* RSDP */
-static void
-build_rsdp(GArray *rsdp_table, BIOSLinker *linker, unsigned xsdt_tbl_offset)
Note: here we use xsdt table not rsdt for ARM. After your change which assigns xsdt table address to rsdt_physical_address, it doesn't work.

IIRC, we discussed this before that ARM virt uses xsdt while pc/q35 uses rsdt. So this patch is not necessary I think.

Thanks,
Shannon
-{
-    AcpiRsdpDescriptor *rsdp = acpi_data_push(rsdp_table, sizeof *rsdp);
-    unsigned xsdt_pa_size = sizeof(rsdp->xsdt_physical_address);
-    unsigned xsdt_pa_offset =
-        (char *)&rsdp->xsdt_physical_address - rsdp_table->data;
-
-    bios_linker_loader_alloc(linker, ACPI_BUILD_RSDP_FILE, rsdp_table, 16,
-                             true /* fseg memory */);
-
-    memcpy(&rsdp->signature, "RSD PTR ", sizeof(rsdp->signature));
-    memcpy(rsdp->oem_id, ACPI_BUILD_APPNAME6, sizeof(rsdp->oem_id));
-    rsdp->length = cpu_to_le32(sizeof(*rsdp));
-    rsdp->revision = 0x02;
-
-    /* Address to be filled by Guest linker */
-    bios_linker_loader_add_pointer(linker,
-        ACPI_BUILD_RSDP_FILE, xsdt_pa_offset, xsdt_pa_size,
-        ACPI_BUILD_TABLE_FILE, xsdt_tbl_offset);
-
-    /* Checksum to be filled by Guest linker */
-    bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE,
-        (char *)rsdp - rsdp_table->data, sizeof *rsdp,
-        (char *)&rsdp->checksum - rsdp_table->data);
-
-    return rsdp_table;
-}
-
  static void
  build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
  {




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