HVM SMBIOS support 4/6

diff -r f91cc71173c5 tools/firmware/rombios/rombios.c
@@ -9443,6 +9443,43 @@
   mov  ds, ax
   ret
 
+#ifdef HVMASSIST
+
+smbios_init:
+  push ax
+  push cx
+  push es
+  push ds
+  push di
+  push si
+
+  ; If we have SMBIOS data, it will be at address 0x9f000, and this
+  ; will copy it to the entry point address (smbios_entry_point).
+  ; This will still copy the memory over if we don't, but that shouldn't
+  ; hurt anything, as that memory won't have the '_SM_' signature.
+  mov cx, #0x001f ; 0x1f bytes to copy
+  mov ax, #0xf000
+  mov es, ax      ; destination segment is 0xf0000
+  mov di, smbios_entry_point ; destination offset
+  mov ax, #0x9f00
+  mov ds, ax      ; source segment is 0x9f000
+  mov si, #0x0000 ; source offset is 0
+  cld
+  rep
+    movsb
+      
+smbios_out:
+  pop si
+  pop di
+  pop ds
+  pop es
+  pop cx
+  pop ax
+
+  ret
+
+#endif
+
 ;; for 'C' strings and other data, insert them here with
 ;; a the following hack:
 ;; DATA_SEG_DEFS_HERE

@@ -9724,6 +9761,7 @@
 
 #ifdef HVMASSIST
   call _copy_e820_table
+  call smbios_init
 #endif
 
   call rom_scan

@@ -10834,4 +10872,11 @@
 db 0,0,0,0     ;; MP feature bytes 2-5.
 #endif
 
+; space for SMBIOS entry point (31 bytes)
+.align 16
+smbios_entry_point:
+db 0,0,0,0,0,0,0,0,0,0
+db 0,0,0,0,0,0,0,0,0,0
+db 0,0,0,0,0,0,0,0,0,0,0
+
 ASM_END

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