[PATCH v2] mini-os: Add suspend stubs for ARM

[Costin Lupu <costin.lupu@xxxxxxxxx>]

This patch introduces the missing suspend-related stubs for ARM. It also
introduces the new arch_suspend() function in order to keep the logic in
kernel_suspend() arch independent.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 arch/arm/setup.c | 15 +++++++++++++++
 arch/x86/setup.c |  9 +++++++++
 include/x86/os.h |  1 +
 shutdown.c       | 10 +---------
 4 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/arch/arm/setup.c b/arch/arm/setup.c
index b65023c..3d112fa 100644
--- a/arch/arm/setup.c
+++ b/arch/arm/setup.c
@@ -53,6 +53,21 @@ arch_fini(void)
 {
 }
 
+void arch_pre_suspend(void)
+{
+}
+
+int arch_suspend(void)
+{
+    printk("Suspend not supported on ARM. Aborting.");
+    do_exit();
+    return 1;
+}
+
+void arch_post_suspend(int canceled)
+{
+}
+
 void
 arch_do_exit(void)
 {
diff --git a/arch/x86/setup.c b/arch/x86/setup.c
index 64b22c5..1ec68d3 100644
--- a/arch/x86/setup.c
+++ b/arch/x86/setup.c
@@ -249,6 +249,15 @@ void arch_pre_suspend(void)
     arch_mm_pre_suspend();
 }
 
+int arch_suspend(void)
+{
+    /*
+     * This hypercall returns 1 if the suspend
+     * was cancelled and 0 if resuming in a new domain
+     */
+    return HYPERVISOR_suspend(virt_to_mfn(start_info_ptr));
+}
+
 void arch_post_suspend(int canceled)
 {
 #if CONFIG_PARAVIRT
diff --git a/include/x86/os.h b/include/x86/os.h
index 46a824d..ee34d78 100644
--- a/include/x86/os.h
+++ b/include/x86/os.h
@@ -73,6 +73,7 @@ void xen_callback_vector(void);
 #endif
 
 void arch_pre_suspend(void);
+int  arch_suspend(void);
 void arch_post_suspend(int canceled);
 void arch_fini(void);
 
diff --git a/shutdown.c b/shutdown.c
index 0854670..bb2c6f1 100644
--- a/shutdown.c
+++ b/shutdown.c
@@ -46,8 +46,6 @@
 #include <mini-os/xmalloc.h>
 
 
-extern start_info_t *start_info_ptr;
-
 #ifdef CONFIG_XENBUS
 static const char *path = "control/shutdown";
 static const char *token = "control/shutdown";
@@ -140,13 +138,7 @@ void kernel_suspend(void)
     pre_suspend();
     arch_pre_suspend();
 
-    /*
-     * This hypercall returns 1 if the suspend
-     * was cancelled and 0 if resuming in a new domain
-     *
-     * TODO Fix this for ARM
-     */
-    rc = HYPERVISOR_suspend(virt_to_mfn(start_info_ptr));
+    rc = arch_suspend();
 
     arch_post_suspend(rc);
     post_suspend(rc);
-- 
2.20.1