[SeaBIOS] [PATCH 5/6] update dsdt ressources at runtime

[Gerd Hoffmann]

Write the pci window location to memory and add a pointer to the SSDT
(BDAT region).  Turn \\SB.PCI0._CRS into a method which looks up the
information there and updates the ressources accordingly.

Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
 src/acpi-dsdt.dsl |   63 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 src/acpi.c        |   28 ++++++++++++++++++++++-
 2 files changed, 88 insertions(+), 3 deletions(-)

diff --git a/src/acpi-dsdt.dsl b/src/acpi-dsdt.dsl
index 4bdc268..5fd3bb2 100644
--- a/src/acpi-dsdt.dsl
+++ b/src/acpi-dsdt.dsl
@@ -132,7 +132,7 @@ DefinitionBlock (
                 B0EJ, 32,
             }
 
-            Name (_CRS, ResourceTemplate ()
+            Name (CRES, ResourceTemplate ()
             {
                 WordBusNumber (ResourceProducer, MinFixed, MaxFixed, PosDecode,
                     0x0000,             // Address Space Granularity
@@ -174,8 +174,67 @@ DefinitionBlock (
                     0xFEBFFFFF,         // Address Range Maximum
                     0x00000000,         // Address Translation Offset
                     0x1EC00000,         // Address Length
-                    ,, , AddressRangeMemory, TypeStatic)
+                    ,, PW32, AddressRangeMemory, TypeStatic)
+            })
+            Name (CR64, ResourceTemplate ()
+            {
+                QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, Cacheable, ReadWrite,
+                    0x00000000,          // Address Space Granularity
+                    0x8000000000,        // Address Range Minimum
+                    0xFFFFFFFFFF,        // Address Range Maximum
+                    0x00000000,          // Address Translation Offset
+                    0x8000000000,        // Address Length
+                    ,, PW64, AddressRangeMemory, TypeStatic)
             })
+            Method (_CRS, 0)
+            {
+                External (\_SB.BDAT)
+                Field(\_SB.BDAT, QWordAcc, NoLock, Preserve) {
+                    QW0, 64,
+                    QW1, 64,
+                    QW2, 64,
+                    QW3, 64,
+                    QW4, 64,
+                    QW5, 64,
+                }
+                Field(\_SB.BDAT, DWordAcc, NoLock, Preserve) {
+                    DWL0, 32,
+                    DWH0, 32,
+                    DWL1, 32,
+                    DWH1, 32,
+                    DWL2, 32,
+                    DWH2, 32,
+                    DWL3, 32,
+                    DWH3, 32,
+                    DWL4, 32,
+                    DWH4, 32,
+                    DWL5, 32,
+                    DWH5, 32,
+		}
+
+                /* fixup 32bit pci io window */
+		CreateDWordField (CRES,\_SB.PCI0.PW32._MIN, PS32)
+		CreateDWordField (CRES,\_SB.PCI0.PW32._MAX, PE32)
+		CreateDWordField (CRES,\_SB.PCI0.PW32._LEN, PL32)
+		Store (DWL0, PS32)
+		Store (DWL1, PE32)
+		Store (DWL2, PL32)
+
+		If (LAnd(LEqual(DWL3, 0x00),LEqual(DWH3, 0x00))) {
+		    Return (CRES)
+		} Else {
+		    /* fixup 64bit pci io window */
+		    CreateQWordField (CR64,\_SB.PCI0.PW64._MIN, PS64)
+		    CreateQWordField (CR64,\_SB.PCI0.PW64._MAX, PE64)
+		    CreateQWordField (CR64,\_SB.PCI0.PW64._LEN, PL64)
+		    Store (QW3, PS64)
+		    Store (QW4, PE64)
+		    Store (QW5, PL64)
+		    /* add window and return result */
+		    ConcatenateResTemplate (CRES, CR64, Local0)
+		    Return (Local0)
+		}
+            }
         }
     }
 
diff --git a/src/acpi.c b/src/acpi.c
index 30888b9..a13298d 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -415,7 +415,8 @@ build_ssdt(void)
     int length = ((1+3+4)
                   + (acpi_cpus * SD_SIZEOF)
                   + (1+2+5+(12*acpi_cpus))
-                  + (6+2+1+(1*acpi_cpus)));
+                  + (6+2+1+(1*acpi_cpus))
+                  + 17);
     u8 *ssdt = malloc_high(sizeof(struct acpi_table_header) + length);
     if (! ssdt) {
         warn_noalloc();
@@ -477,6 +478,31 @@ build_ssdt(void)
     for (i=0; i<acpi_cpus; i++)
         *(ssdt_ptr++) = (i < CountCPUs) ? 0x01 : 0x00;
 
+    // store pci io windows: start, end, length
+    // this way we don't have to do the math in the dsdt
+    u64 *pcimem = malloc_high(sizeof(*pcimem) * 6);
+    pcimem[0] = pcimem_start;
+    pcimem[1] = pcimem_end - 1;
+    pcimem[2] = pcimem_end - pcimem_start - 1;
+    pcimem[3] = pcimem64_start;
+    pcimem[4] = pcimem64_end - 1;
+    pcimem[5] = pcimem64_end - pcimem64_start - 1;
+
+    // build "OperationRegion(BDAT, SystemMemory, 0x12345678, 0x87654321)"
+    *(ssdt_ptr++) = 0x5B; // ExtOpPrefix
+    *(ssdt_ptr++) = 0x80; // OpRegionOp
+    *(ssdt_ptr++) = 'B';
+    *(ssdt_ptr++) = 'D';
+    *(ssdt_ptr++) = 'A';
+    *(ssdt_ptr++) = 'T';
+    *(ssdt_ptr++) = 0x00; // SystemMemory
+    *(ssdt_ptr++) = 0x0C; // DWordPrefix
+    *(u32*)ssdt_ptr = (u32)pcimem;
+    ssdt_ptr += 4;
+    *(ssdt_ptr++) = 0x0C; // DWordPrefix
+    *(u32*)ssdt_ptr = sizeof(*pcimem) * 6;
+    ssdt_ptr += 4;
+
     build_header((void*)ssdt, SSDT_SIGNATURE, ssdt_ptr - ssdt, 1);
 
     //hexdump(ssdt, ssdt_ptr - ssdt);
-- 
1.7.1