hvmloader: add code to generate a $PIR table.

Does not replace the table hardcoded in ROMBIOS (it ain't broke) but
is used for SeaBIOS.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>

tools/firmware/hvmloader/Makefile

@@ -30,7 +30,7 @@ CFLAGS += $(CFLAGS_xeninclude)
 
 OBJS  = hvmloader.o mp_tables.o util.o smbios.o 
 OBJS += 32bitbios_support.o smp.o cacheattr.o xenbus.o
-OBJS += e820.o pci.o
+OBJS += e820.o pci.o pir.o
 ifeq ($(debug),y)
 OBJS += tests.o
 endif

tools/firmware/hvmloader/config.h

@@ -31,6 +31,7 @@ struct bios_config {
     void (*acpi_build_tables)(void);
     void (*create_mp_tables)(void);
     void (*create_smbios_tables)(void);
+    void (*create_pir_tables)(void);
 };
 
 extern struct bios_config rombios_config;

tools/firmware/hvmloader/hvmloader.c

@@ -423,9 +423,12 @@ int main(void)
     if (bios->bios_relocate)
         bios->bios_relocate();
 
-    if ( bios->create_mp_tables &&
-         ( (hvm_info->nr_vcpus > 1) || hvm_info->apic_mode ) )
-        bios->create_mp_tables();
+    if ( (hvm_info->nr_vcpus > 1) || hvm_info->apic_mode ) {
+        if ( bios->create_mp_tables )
+            bios->create_mp_tables();
+        if ( bios->create_pir_tables )
+            bios->create_pir_tables();
+    }
 
     if ( bios->load_roms )
     {

tools/firmware/hvmloader/pir.c

@@ -0,0 +1,67 @@
+/*
+ * pir.c: Support for genrating $PIR tables.
+ *
+ * Copyright (c) 2011 Citrix Systems Inc
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include "config.h"
+#include "pir_types.h"
+#include "util.h"
+
+/*
+ * The structure of these tables is described in
+ * http://www.microsoft.com/taiwan/whdc/archive/pciirq.mspx
+ */
+unsigned long create_pir_tables(void)
+{
+    int length = sizeof(struct pir_table) + sizeof(struct pir_slot)*NR_PIR_SLOTS;
+    struct pir_table *pir = scratch_alloc(length, 0);
+    int i, checksum;
+
+    memset(pir, 0, length);
+
+    memcpy(pir->signature, "$PIR", 4);
+    pir->version = 0x0100;
+    pir->length = length;
+
+    pir->router_bus = 0;
+    pir->router_devfn = PCI_ISA_DEVFN;
+    pir->router_vid = 0x8086;
+    pir->router_did = 0x122e;
+
+    pir->pci_irqs = 0x0000;
+
+    for ( i = 0 ; i < NR_PIR_SLOTS; i++ )
+    {
+        struct pir_slot *slot = &pir->slots[i];
+        slot->slot = i;
+        slot->bus = 0;
+        slot->dev = i<<3;
+        slot->link_a = 0x60 + (i+1)%4;
+        slot->bitmap_a = PCI_ISA_IRQ_MASK;
+        slot->link_b = 0x60 + (i+2)%4;
+        slot->bitmap_b = PCI_ISA_IRQ_MASK;
+        slot->link_c = 0x60 + (i+3)%4;
+        slot->bitmap_c = PCI_ISA_IRQ_MASK;
+        slot->link_d = 0x60 + (i+4)%4;
+        slot->bitmap_d = PCI_ISA_IRQ_MASK;
+    }
+
+    checksum = 0;
+    for ( i = 0; i < length; i++)
+    {
+        checksum += ((int8_t *)pir)[i];
+    }
+    pir->checksum = -checksum;
+
+    return (unsigned long)pir;
+}

tools/firmware/hvmloader/pir_types.h

@@ -0,0 +1,61 @@
+/*
+ * pir_types.h - data structure definitions for Xen HVM $PIR support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) Citrix Systems, 2011
+ *
+ * See the PCI Interrupt Routing spec for more detail:
+ *   http://www.microsoft.com/taiwan/whdc/archive/pciirq.mspx
+ */
+
+#ifndef PIR_TYPES_H
+#define PIR_TYPES_H
+
+#include <stdint.h>
+
+#define NR_PIR_SLOTS 6
+
+struct pir_slot {
+    uint8_t bus;
+    uint8_t dev;
+    uint8_t link_a;
+    uint16_t bitmap_a;
+    uint8_t link_b;
+    uint16_t bitmap_b;
+    uint8_t link_c;
+    uint16_t bitmap_c;
+    uint8_t link_d;
+    uint16_t bitmap_d;
+    uint8_t slot;
+    uint8_t reserved;
+} __attribute__ ((packed));
+
+struct pir_table {
+    char signature[4];
+    uint16_t version;
+    uint16_t length;
+    uint8_t router_bus;
+    uint8_t router_devfn;
+    uint16_t pci_irqs;
+    uint16_t router_vid;
+    uint16_t router_did;
+    uint32_t miniport_data;
+    uint8_t reserved[11];
+    uint8_t checksum;
+    struct pir_slot slots[0];
+} __attribute__ ((packed));
+
+#endif

tools/firmware/hvmloader/rombios.c

@@ -187,6 +187,7 @@ struct bios_config rombios_config =  {
     .acpi_build_tables = rombios_acpi_build_tables,
     .create_mp_tables = rombios_create_mp_tables,
     .create_smbios_tables = rombios_create_smbios_tables,
+    .create_pir_tables = NULL, /* embedded in ROMBIOS */
 };
 
 /*

tools/firmware/hvmloader/seabios.c

@@ -107,6 +107,11 @@ static void seabios_create_smbios_tables(void)
     add_table(ep);
 }
 
+static void seabios_create_pir_tables(void)
+{
+    add_table(create_pir_tables());
+}
+
 static void seabios_setup_e820(void)
 {
     struct seabios_info *info = (void *)BIOS_INFO_PHYSICAL_ADDRESS;
@@ -142,6 +147,7 @@ struct bios_config seabios_config = {
     .acpi_build_tables = seabios_acpi_build_tables,
     .create_mp_tables = seabios_create_mp_tables,
     .create_smbios_tables = seabios_create_smbios_tables,
+    .create_pir_tables = seabios_create_pir_tables,
 };
 
 /*

tools/firmware/hvmloader/util.h

@@ -195,6 +195,8 @@ unsigned long create_mp_tables(void *table);
 void hvm_write_smbios_tables(unsigned long ep,
 			    unsigned long smbios_start,
 			    unsigned long smbios_end);
+unsigned long create_pir_tables(void);
+
 void smp_initialise(void);
 
 #include "e820.h"