On PCI init PCI bridge devices may need some
extra info about bus number to reserve, IO, memory and
prefetchable memory limits. QEMU can provide this
with special vendor-specific PCI capability.

This capability is intended to be used only
for Red Hat PCI bridges, i.e. QEMU cooperation.

Signed-off-by: Aleksandr Bezzubikov <zuban...@gmail.com>
 src/fw/dev-pci.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/fw/dev-pci.h

diff --git a/src/fw/dev-pci.h b/src/fw/dev-pci.h
new file mode 100644
index 0000000..2c8ddb0
--- /dev/null
+++ b/src/fw/dev-pci.h
@@ -0,0 +1,50 @@
+#ifndef _PCI_CAP_H
+#define _PCI_CAP_H
+#include "types.h"
+QEMU-specific vendor(Red Hat)-specific capability.
+It's intended to provide some hints for firmware to init PCI devices.
+Its structure is shown below:
+u8 id;       Standard PCI Capability Header field
+u8 next;     Standard PCI Capability Header field
+u8 len;      Standard PCI Capability Header field
+u8 type;     Red Hat vendor-specific capability type:
+               now only REDHAT_CAP_TYP_QEMU=1 exists
+u32 bus_res;            minimum bus number to reserve;
+                        this is necessary for PCI Express Root Ports
+                        to support PCIE-to-PCI bridge hotplug
+u64 io;                 IO space to reserve
+u64 mem;                non-prefetchable memory space to reserve
+u64 prefetchable_mem;   prefetchable memory space to reserve
+If any field value in Data section is -1,
+it means that such kind of reservation
+is not needed and must be ignored.
+/* Offset of vendor-specific capability type field */
+/* List of valid Red Hat vendor-specific capability types */
+#define REDHAT_CAP_TYPE_QEMU    1
+/* Offsets of QEMU capability fields */
+#define QEMU_PCI_CAP_BUS_RES        4
+#define QEMU_PCI_CAP_IO             8
+#define QEMU_PCI_CAP_MEM            16
+#define QEMU_PCI_CAP_PREF_MEM       24
+#define QEMU_PCI_CAP_SIZE           32
+#endif /* _PCI_CAP_H */

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