docs/html/: Annotations for two hypercalls

Add annotations for a couple of the hypercalls:
 HYPERVISOR_set_trap_table
 HYPERVISOR_mmu_update

We do this by
 * annotating the list of #defines for hypercall numbers
 * annotating the list of error values
 * providing a function prototype for the systematically-named functions
The header generator does the rest.

This exercise revealed a couple of infelicities:
 * In the actual source code, do_mmu_update is defined to return an int
   and do_set_trap_table a long.  However both functions return either
   -Efoo (on error) or 0 for success.
 * The error numbers are defined only in the private header file
   xen/include/xen/errno.h and then only with names which will
   typically clash with other projects.  It would be nice to include a
   public version of this header which defines XEN_E*.  But for now
   we run xen-headers on errno.h too.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <Ian.Jackson@eu.citrix.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index fde9fa5091..f2c9e6fc97 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -55,6 +55,8 @@ DEFINE_XEN_GUEST_HANDLE(xen_pfn_t);
  * HYPERCALLS
  */
 
+/* ` enum hypercall_num { // __HYPERVISOR_* => HYPERVISOR_*() */
+
 #define __HYPERVISOR_set_trap_table        0
 #define __HYPERVISOR_mmu_update            1
 #define __HYPERVISOR_set_gdt               2
@@ -105,6 +107,8 @@ DEFINE_XEN_GUEST_HANDLE(xen_pfn_t);
 #define __HYPERVISOR_arch_6               54
 #define __HYPERVISOR_arch_7               55
 
+/* ` } */
+
 /*
  * HYPERCALL COMPATIBILITY.
  */
@@ -163,8 +167,11 @@ DEFINE_XEN_GUEST_HANDLE(xen_pfn_t);
 #define NR_VIRQS       24
 
 /*
- * HYPERVISOR_mmu_update(reqs, count, pdone, foreigndom)
- * 
+ * ` enum neg_errnoval
+ * ` HYPERVISOR_mmu_update(const struct mmu_update reqs[],
+ * `                       unsigned count, unsigned *done_out,
+ * `                       unsigned foreigndom)
+ * `
  * @reqs is an array of mmu_update_t structures ((ptr, val) pairs).
  * @count is the length of the above array.
  * @pdone is an output parameter indicating number of completed operations