Use c_string to define host_get_kernel_version and host_get_kernel_boot_info.

The existing definitions for kernel_version_t and kernel_boot_info_t use
(MACH_MSG_TYPE_STRING, length*8) which result in message types that have
a single element of 512 or 4096 bytes (set as msgt_size). This results
in MiG generating mach_msg_type_long_t. Using c_string has the benefit
of moving this size to be defined as msgt_number which doesn't overflow.
This will allow us to simplify the 64 bit RPC ABI since all msgt_size can
be defined with just 8 bits (as it should be expected).

The resulting implementation is the same but we still need to define new
RPCs since server and user expect different mach_msg_type_t.
Message-Id: <ZA63pS8j9J6NwuXY@jupiter.tail36e24.ts.net>

2 files changed, 16 insertions, 0 deletions

diff --git a/kern/host.c b/kern/host.c
index 7ce8edff..50f58e9c 100644
--- a/kern/host.c
+++ b/kern/host.c
@@ -219,6 +219,14 @@ kern_return_t host_kernel_version(
 	return KERN_SUCCESS;
 }
 
+/* Same as above */
+kern_return_t host_get_kernel_version(
+	const host_t		host,
+	kernel_version_t	out_version)
+{
+	return host_kernel_version(host, out_version);
+}
+
 /*
  *	host_processor_sets:
  *
diff --git a/kern/machine.c b/kern/machine.c
index bf9677c9..c9e368a0 100644
--- a/kern/machine.c
+++ b/kern/machine.c
@@ -674,3 +674,11 @@ host_get_boot_info(
 	(void) strncpy(boot_info, src, KERNEL_BOOT_INFO_MAX);
 	return KERN_SUCCESS;
 }
+
+kern_return_t
+host_get_kernel_boot_info(
+        host_t              priv_host,
+        kernel_boot_info_t  boot_info)
+{
+	return host_get_boot_info(priv_host, boot_info);
+}