hvmloader: Move init_vm86_tss() back into common code.

It is not BIOS specific.

Signed-off-by: Keir Fraser <keir@xen.org>

1 files changed, 20 insertions, 2 deletions

diff --git a/tools/firmware/hvmloader/hvmloader.c b/tools/firmware/hvmloader/hvmloader.c
index 4129670fc7..f5817b31ff 100644
--- a/tools/firmware/hvmloader/hvmloader.c
+++ b/tools/firmware/hvmloader/hvmloader.c
@@ -336,6 +336,25 @@ static void cmos_write_memory_size(void)
     cmos_outb(0x35, (uint8_t)( alt_mem >> 8));
 }
 
+/*
+ * Set up an empty TSS area for virtual 8086 mode to use. 
+ * The only important thing is that it musn't have any bits set 
+ * in the interrupt redirection bitmap, so all zeros will do.
+ */
+static void init_vm86_tss(void)
+{
+    void *tss;
+    struct xen_hvm_param p;
+
+    tss = mem_alloc(128, 128);
+    memset(tss, 0, 128);
+    p.domid = DOMID_SELF;
+    p.index = HVM_PARAM_VM86_TSS;
+    p.value = virt_to_phys(tss);
+    hypercall_hvm_op(HVMOP_set_param, &p);
+    printf("vm86 TSS at %08lx\n", virt_to_phys(tss));
+}
+
 static void apic_setup(void)
 {
     /* Set the IOAPIC ID to the static value used in the MP/ACPI tables. */
@@ -506,8 +525,7 @@ int main(void)
         hypercall_hvm_op(HVMOP_set_param, &p);
     }
 
-    if ( bios->vm86_setup )
-        bios->vm86_setup();
+    init_vm86_tss();
 
     cmos_write_memory_size();