[PATCH v2 04/12] hvmloader: add ACPI enabling for Q35

[Joel Upham <jupham125@xxxxxxxxx>]

In order to turn on ACPI for OS, we need to write a chipset-specific value
to SMI_CMD register (sort of imitation of the APM->ACPI switch on real
systems). Modify acpi_enable_sci() function to support both i440 and Q35
emulation.

Signed-off-by: Alexey Gerasimenko <x1917x@xxxxxxxxx>
Signed-off-by: Joel Upham <jupham125@xxxxxxxxx>
---
 tools/firmware/hvmloader/hvmloader.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/firmware/hvmloader/hvmloader.c 
b/tools/firmware/hvmloader/hvmloader.c
index c58841e5b5..ef0e66b214 100644
--- a/tools/firmware/hvmloader/hvmloader.c
+++ b/tools/firmware/hvmloader/hvmloader.c
@@ -259,8 +259,17 @@ static const struct bios_config *detect_bios(void)
 static void acpi_enable_sci(void)
 {
     uint8_t pm1a_cnt_val;
+    uint8_t acpi_enable_val;
+
+#define SMI_CMD_IOPORT       0xb2
+#define PIIX4_ACPI_ENABLE    0xf1
+#define ICH9_ACPI_ENABLE     0x02
+
+    if (get_pc_machine_type() == MACHINE_TYPE_Q35)
+        acpi_enable_val = ICH9_ACPI_ENABLE;
+    else
+        acpi_enable_val = PIIX4_ACPI_ENABLE;
 
-#define PIIX4_SMI_CMD_IOPORT 0xb2
 #define PIIX4_ACPI_ENABLE    0xf1
 
     /*
@@ -269,7 +278,7 @@ static void acpi_enable_sci(void)
      */
     pm1a_cnt_val = inb(ACPI_PM1A_CNT_BLK_ADDRESS_V1);
     if ( !(pm1a_cnt_val & ACPI_PM1C_SCI_EN) )
-        outb(PIIX4_SMI_CMD_IOPORT, PIIX4_ACPI_ENABLE);
+        outb(SMI_CMD_IOPORT, acpi_enable_val);
 
     pm1a_cnt_val = inb(ACPI_PM1A_CNT_BLK_ADDRESS_V1);
     BUG_ON(!(pm1a_cnt_val & ACPI_PM1C_SCI_EN));
-- 
2.34.1