[PATCH v2 1/2] mini-os: partially revert "remove using start_info ..."

[Juergen Gross <jgross@suse.com>]

Commit e33452c4f5547ed14defe6382b3b53664ac5bd8a ("remove using
start_info in architecture independent code") removed the start_info
variable completely. grub stubdom needs the start_info structure.

Readd the start_info structure, but make it dependent on
CONFIG_PARAVIRT.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/setup.c     | 12 ++++++++++++
 include/hypervisor.h | 13 ++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/setup.c b/arch/x86/setup.c
index 86955cf..5278227 100644
--- a/arch/x86/setup.c
+++ b/arch/x86/setup.c
@@ -33,6 +33,14 @@
 #include <xen/arch-x86/cpuid.h>
 #include <xen/arch-x86/hvm/start_info.h>
 
+#ifdef CONFIG_PARAVIRT
+/*
+ * This structure contains start-of-day info, such as pagetable base pointer,
+ * address of the shared_info structure, and things like that.
+ */
+union start_info_union start_info_union;
+#endif
+
 /*
  * Shared page for communicating with the hypervisor.
  * Events flags go here, for example.
@@ -189,6 +197,10 @@ arch_init(void *par)
 	/* print out some useful information  */
 	print_start_of_day(par);
 
+#ifdef CONFIG_PARAVIRT
+	memcpy(&start_info, par, sizeof(start_info));
+#endif
+
 	start_kernel();
 }
 
diff --git a/include/hypervisor.h b/include/hypervisor.h
index 3073a8a..f3b1f3c 100644
--- a/include/hypervisor.h
+++ b/include/hypervisor.h
@@ -27,7 +27,18 @@
 #include <mini-os/traps.h>
 
 /* hypervisor.c */
-#ifndef CONFIG_PARAVIRT
+#ifdef CONFIG_PARAVIRT
+/*
+ * a placeholder for the start of day information passed up from the hypervisor
+ */
+union start_info_union
+{
+    start_info_t start_info;
+    char padding[512];
+};
+extern union start_info_union start_info_union;
+#define start_info (start_info_union.start_info)
+#else
 int hvm_get_parameter(int idx, uint64_t *value);
 int hvm_set_parameter(int idx, uint64_t value);
 #endif
-- 
2.6.6


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