From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Sun, 29 Mar 2015 18:17:05 +0000 (+0100)
Subject: Write to the hypervisor console
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=1cb1e25efbf77c798c41667544bea39e7ef7c96c;p=people%2Froyger%2Fxen-test-framework.git

Write to the hypervisor console

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/arch/x86/hypercall_page.S b/arch/x86/hypercall_page.S
index 4e8ed73..725cfb2 100644
--- a/arch/x86/hypercall_page.S
+++ b/arch/x86/hypercall_page.S
@@ -9,4 +9,5 @@ GLOBAL(hypercall_page)
         .fill PAGE_SIZE, 1, 0xc3
         .size hypercall_page, PAGE_SIZE
 
+DECLARE_HYPERCALL(console_io)
 DECLARE_HYPERCALL(sched_op)
diff --git a/arch/x86/setup.c b/arch/x86/setup.c
index 2a2451d..09669b7 100644
--- a/arch/x86/setup.c
+++ b/arch/x86/setup.c
@@ -1,17 +1,22 @@
 #include <xtf/types.h>
+#include <xtf/console.h>
+#include <xtf/hypercall.h>
 
 #include <arch/x86/config.h>
 
-#include <xen/xen.h>
-
 #ifdef CONFIG_ENV_pv
 /* Filled in by head_pv.S */
 start_info_t *start_info = NULL;
 #endif
 
-void arch_setup(void)
+static void xen_console_write(const char *buf, size_t len)
 {
+    hypercall_console_write(buf, len);
+}
 
+void arch_setup(void)
+{
+    register_console_callback(xen_console_write);
 }
 
 /*
diff --git a/common/console.c b/common/console.c
index 0f907fe..da68dba 100644
--- a/common/console.c
+++ b/common/console.c
@@ -6,6 +6,7 @@
 /*
  * Output functions, registered if/when available.
  * Possibilities:
+ * - Xen hypervisor console
  */
 static cons_output_cb output_fns[1];
 static unsigned int nr_cons_cb;
diff --git a/include/arch/x86/x86_32/hypercall-x86_32.h b/include/arch/x86/x86_32/hypercall-x86_32.h
index 0394cd9..b31ef4a 100644
--- a/include/arch/x86/x86_32/hypercall-x86_32.h
+++ b/include/arch/x86/x86_32/hypercall-x86_32.h
@@ -19,6 +19,18 @@
         (type)__res;                                                    \
     })
 
+#define _hypercall32_3(type, name, a1, a2, a3)                          \
+    ({                                                                  \
+        long __res, __ign1, __ign2, __ign3;                             \
+        asm volatile (                                                  \
+            "call hypercall_page + %c[offset]"                          \
+            : "=a" (__res), "=b" (__ign1), "=c" (__ign2), "=d" (__ign3) \
+            : [offset] "i" (__HYPERVISOR_##name * 32),                  \
+              "1" ((long)(a1)), "2" ((long)(a2)), "3" ((long)(a3))      \
+            : "memory" );                                               \
+        (type)__res;                                                    \
+    })
+
 #endif /* XTF_X86_32_HYPERCALL_H */
 
 /*
diff --git a/include/arch/x86/x86_64/hypercall-x86_64.h b/include/arch/x86/x86_64/hypercall-x86_64.h
index 916dd42..3982a9b 100644
--- a/include/arch/x86/x86_64/hypercall-x86_64.h
+++ b/include/arch/x86/x86_64/hypercall-x86_64.h
@@ -19,6 +19,18 @@
         (type)__res;                                                    \
     })
 
+#define _hypercall64_3(type, name, a1, a2, a3)                          \
+    ({                                                                  \
+        long __res, __ign1, __ign2, __ign3;                             \
+        asm volatile (                                                  \
+            "call hypercall_page + %c[offset]"                          \
+            : "=a" (__res), "=D" (__ign1), "=S" (__ign2), "=d" (__ign3) \
+            : [offset] "i" (__HYPERVISOR_##name * 32),                  \
+              "1" ((long)(a1)), "2" ((long)(a2)), "3" ((long)(a3))      \
+            : "memory" );                                               \
+        (type)__res;                                                    \
+    })
+
 #endif /* XTF_X86_64_HYPERCALL_H */
 
 /*
diff --git a/include/xen/xen.h b/include/xen/xen.h
index 305c47e..e311a6e 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -11,8 +11,12 @@
 #error Bad architecture
 #endif
 
+#define __HYPERVISOR_console_io           18
 #define __HYPERVISOR_sched_op             29
 
+/* Commands to HYPERVISOR_console_io */
+#define CONSOLEIO_write                   0
+
 #ifndef __ASSEMBLY__
 struct start_info {
     /* THE FOLLOWING ARE FILLED IN BOTH ON INITIAL BOOT AND ON RESUME.    */
diff --git a/include/xtf/hypercall.h b/include/xtf/hypercall.h
index c6f8ec0..3dca881 100644
--- a/include/xtf/hypercall.h
+++ b/include/xtf/hypercall.h
@@ -7,11 +7,13 @@
 
 # include <arch/x86/x86_64/hypercall-x86_64.h>
 # define HYPERCALL2 _hypercall64_2
+# define HYPERCALL3 _hypercall64_3
 
 #elif defined(__i386__)
 
 # include <arch/x86/x86_32/hypercall-x86_32.h>
 # define HYPERCALL2 _hypercall32_2
+# define HYPERCALL3 _hypercall32_3
 
 #else
 # error Bad architecture for hypercalls
@@ -32,6 +34,11 @@ static inline long hypercall_sched_op(unsigned int cmd, void *arg)
 /*
  * Higher level hypercall helpers
  */
+static inline void hypercall_console_write(const char *buf, unsigned long count)
+{
+    (void)HYPERCALL3(long, console_io, CONSOLEIO_write, count, buf);
+}
+
 static inline long hypercall_shutdown(unsigned int reason)
 {
     return hypercall_sched_op(SCHEDOP_shutdown, &reason);