[PATCH 2/9] kvm tools: Add basic ioport dynamic allocation

[Sasha Levin <levinsasha928@gmail.com>]

Add a very simple allocation of ioports.

This prevents the need to coordinate ioports between different
modules.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
 tools/kvm/include/kvm/ioport.h |    5 +++++
 tools/kvm/ioport.c             |    7 +++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/tools/kvm/include/kvm/ioport.h b/tools/kvm/include/kvm/ioport.h
index 2a8d74d..bc7ea02 100644
--- a/tools/kvm/include/kvm/ioport.h
+++ b/tools/kvm/include/kvm/ioport.h
@@ -7,6 +7,9 @@
 
 /* some ports we reserve for own use */
 #define IOPORT_DBG			0xe0
+#define IOPORT_START			0x6200
+#define IOPORT_SIZE			0x400
+
 #define IOPORT_VESA			0xa200
 #define IOPORT_VESA_SIZE		256
 #define IOPORT_VIRTIO_P9		0xb200	/* Virtio 9P device */
@@ -34,6 +37,8 @@ void ioport__setup_legacy(void);
 void ioport__register(u16 port, struct ioport_operations *ops, int count);
 void ioport__register_param(u16 port, struct ioport_operations *ops, int count, void *param);
 
+u16 ioport__find_free_range(void);
+
 static inline u8 ioport__read8(u8 *data)
 {
 	return *data;
diff --git a/tools/kvm/ioport.c b/tools/kvm/ioport.c
index 159d089..0db5a87 100644
--- a/tools/kvm/ioport.c
+++ b/tools/kvm/ioport.c
@@ -126,6 +126,13 @@ static void ioport_error(u16 port, void *data, int direction, int size, u32 coun
 	fprintf(stderr, "IO error: %s port=%x, size=%d, count=%u\n", to_direction(direction), port, size, count);
 }
 
+u16 ioport__find_free_range(void)
+{
+	static u16 cur_loc;
+
+	return IOPORT_START + (cur_loc++ * IOPORT_SIZE);
+}
+
 bool kvm__emulate_io(struct kvm *kvm, u16 port, void *data, int direction, int size, u32 count)
 {
 	struct ioport_operations *ops;
-- 
1.7.5.rc3