[PATCH v3 07/11] bsd-user: sysctl helper funtions: sysctl_name2oid and sysctl_oidfmt

[Warner Losh <imp@bsdimp.com>]

From: Juergen Lock <nox@jelal.kn-bremen.de>

Helper functions for sysctl implementations. sysctl_name2oid and
sysctl_oidfmt convert oids between host and targets

Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 bsd-user/freebsd/os-sys.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/bsd-user/freebsd/os-sys.c b/bsd-user/freebsd/os-sys.c
index 77c2b157c61..dee8c92309b 100644
--- a/bsd-user/freebsd/os-sys.c
+++ b/bsd-user/freebsd/os-sys.c
@@ -231,6 +231,24 @@ static void G_GNUC_UNUSED h2g_old_sysctl(void *holdp, size_t *holdlen, uint32_t
 #endif
 }
 
+/*
+ * Convert the undocmented name2oid sysctl data for the target.
+ */
+static inline void G_GNUC_UNUSED sysctl_name2oid(uint32_t *holdp, size_t holdlen)
+{
+    size_t i, num = holdlen / sizeof(uint32_t);
+
+    for (i = 0; i < num; i++) {
+        holdp[i] = tswap32(holdp[i]);
+    }
+}
+
+static inline void G_GNUC_UNUSED sysctl_oidfmt(uint32_t *holdp)
+{
+    /* byte swap the kind */
+    holdp[0] = tswap32(holdp[0]);
+}
+
 /* sysarch() is architecture dependent. */
 abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2)
 {
-- 
2.39.1