From 223e48e6ae651e6e99bc1fbb58ec30d7f88a6e32 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Sat, 12 Jan 2008 06:39:15 -0500
Subject: X86: Make the IO ports work using extra physical address lines. Add a
 serial port.

--HG--
extra : convert_revision : a14cb4fc9afedfc0ff58b11a7f8fb5516d462cc6
---
 src/arch/x86/tlb.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/arch/x86/tlb.cc')

diff --git a/src/arch/x86/tlb.cc b/src/arch/x86/tlb.cc
index 08c621615..2e6ea4a22 100644
--- a/src/arch/x86/tlb.cc
+++ b/src/arch/x86/tlb.cc
@@ -470,6 +470,16 @@ TLB::translate(RequestPtr &req, ThreadContext *tc, bool write, bool execute)
             //overlapping.
             req->setPaddr(regNum * sizeof(MiscReg));
             return NoFault;
+        } else if (prefix == IntAddrPrefixIO) {
+            // TODO If CPL > IOPL or in virtual mode, check the I/O permission
+            // bitmap in the TSS.
+
+            Addr IOPort = vaddr & ~IntAddrPrefixMask;
+            // Make sure the address fits in the expected 16 bit IO address
+            // space.
+            assert(!(IOPort & ~0xFFFF));
+            req->setPaddr(PhysAddrPrefixIO | IOPort);
+            return NoFault;
         } else {
             panic("Access to unrecognized internal address space %#x.\n",
                     prefix);
-- 
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