[SeaBIOS] [PATCH v16] Add pvpanic device driver

[Hu Tao]

pvpanic device is used to notify host(qemu) when guest panic happens.

Signed-off-by: Paolo Bonzini 
Signed-off-by: Hu Tao 
---
 src/acpi.c        |  3 +++
 src/ssdt-misc.dsl | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/src/acpi.c b/src/acpi.c
index bc4d8ea..fe504f0 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -534,6 +534,9 @@ build_ssdt(void)
         ssdt_ptr[acpi_pci64_valid[0]] = 0;
     }

+    int pvpanic_port = romfile_loadint("etc/pvpanic-port", 0x0);
+    *(u16 *)(ssdt_ptr + *ssdt_isa_pest) = pvpanic_port;
+
     ssdt_ptr += sizeof(ssdp_misc_aml);

// build Scope(_SB_) header
diff --git a/src/ssdt-misc.dsl b/src/ssdt-misc.dsl
index 679422b..acc850e 100644
--- a/src/ssdt-misc.dsl
+++ b/src/ssdt-misc.dsl
@@ -55,4 +55,50 @@ DefinitionBlock ("ssdt-misc.aml", "SSDT", 0x01, "BXPC", "BXSSDTSUSP", 0x1)
             Zero   /* reserved */
         })
     }
+
+    External(_SB.PCI0, DeviceObj)
+    External(_SB.PCI0.ISA, DeviceObj)
+
+    Scope(_SB.PCI0.ISA) {
+        Device(PEVT) {
+            Name(_HID, "QEMU0001")
+            /* PEST will be patched to be Zero if no such device */
+            ACPI_EXTRACT_NAME_WORD_CONST ssdt_isa_pest
+            Name(PEST, 0xFFFF)
+            OperationRegion(PEOR, SystemIO, PEST, 0x01)
+            Field(PEOR, ByteAcc, NoLock, Preserve) {
+                PEPT,   8,
+            }
+
+            Method(_STA, 0, NotSerialized) {
+                Store(PEST, Local0)
+                If (LEqual(Local0, Zero)) {
+                    Return (0x00)
+                } Else {
+                    Return (0x0F)
+                }
+            }
+
+            Method(RDPT, 0, NotSerialized) {
+                Store(PEPT, Local0)
+                Return (Local0)
+            }
+
+            Method(WRPT, 1, NotSerialized) {
+                Store(Arg0, PEPT)
+            }
+
+            Name(_CRS, ResourceTemplate() {
+                IO(Decode16, 0x00, 0x00, 0x01, 0x01, IO)
+            })
+
+            CreateWordField(_CRS, IO._MIN, IOMN)
+            CreateWordField(_CRS, IO._MAX, IOMX)
+
+            Method(_INI, 0, NotSerialized) {
+                Store(PEST, IOMN)
+                Store(PEST, IOMX)
+            }
+        }
+    }
 }