Implement the fw_cfg interface basics and use it to set the bootorder

if a bootdevice was forced. This implements both the pure IO port interface
and also the new DMA interface, a few direct commands are implemented which
are needed but in general the "file" interface should be used. There is no
write support for the guest. Tested against the latest vmm-firmware port.
This requires also a -current kernel to pass the IO ports to vmd(8).
OK mlarkin@ ccardenas@

1 files changed, 28 insertions, 0 deletions

diff --git a/usr.sbin/vmd/fw_cfg.h b/usr.sbin/vmd/fw_cfg.h
new file mode 100644
index 00000000000..d120254280e
--- /dev/null
+++ b/usr.sbin/vmd/fw_cfg.h
@@ -0,0 +1,28 @@
+/*	$OpenBSD: fw_cfg.h,v 1.1 2018/12/10 21:30:33 claudio Exp $	*/
+/*
+ * Copyright (c) 2018 Claudio Jeker <claudio@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#define	FW_CFG_IO_SELECT	0x510
+#define	FW_CFG_IO_DATA		0x511
+#define	FW_CFG_IO_DMA_ADDR_HIGH	0x514
+#define	FW_CFG_IO_DMA_ADDR_LOW	0x518
+
+void	fw_cfg_init(struct vmop_create_params *);
+int	fw_cfg_dump(int);
+int	fw_cfg_restore(int);
+uint8_t	vcpu_exit_fw_cfg(struct vm_run_params *);
+uint8_t	vcpu_exit_fw_cfg_dma(struct vm_run_params *);
+void	fw_cfg_add_file(const char *, const void *, size_t);