[Xen-changelog] [xen-unstable] [HVM][MMIO] Support decode of 0x83 opcode (or imm8, m32/64').

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 2049467adee349ad576e8afee5de77e23d8928d8
# Parent  7d37df6c324721647d5d6c930af09101f1165e23
[HVM][MMIO] Support decode of 0x83 opcode (or imm8,m32/64').
This instruction is used by both WinXP during an SMP installation and by
Sun Solaris.  With this patch Sun Solaris UP is able to boot.  Windows
SMP gets a bit further but still has issues.

Signed-off-by: Tom Woller <thomas.woller@xxxxxxx>
Signed-off-by: Travis Betak <tbetak.woller@xxxxxxx>
---
 xen/arch/x86/hvm/platform.c |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)

diff -r 7d37df6c3247 -r 2049467adee3 xen/arch/x86/hvm/platform.c
--- a/xen/arch/x86/hvm/platform.c       Wed Jun 07 14:20:29 2006 +0100
+++ b/xen/arch/x86/hvm/platform.c       Wed Jun 07 14:21:49 2006 +0100
@@ -426,19 +426,30 @@ static int hvm_decode(int realmode, unsi
 
     case 0x80:
     case 0x81:
+    case 0x83:
         {
             unsigned char ins_subtype = (opcode[1] >> 3) & 7;
 
             if (opcode[0] == 0x80) {
                 GET_OP_SIZE_FOR_BYTE(size_reg);
                 instr->op_size = BYTE;
-            } else {
+            } else if (opcode[0] == 0x81) {
                 GET_OP_SIZE_FOR_NONEBYTE(instr->op_size);
                 size_reg = instr->op_size;
+            } else if (opcode[0] == 0x83) {
+                GET_OP_SIZE_FOR_NONEBYTE(size_reg);
+                instr->op_size = size_reg;
             }
+           
+            /* opcode 0x83 always has a single byte operand */
+            if (opcode[0] == 0x83)
+                instr->immediate = 
+                    (signed char)get_immediate(realmode, opcode+1, BYTE);
+            else
+                instr->immediate = 
+                    get_immediate(realmode, opcode+1, instr->op_size);
 
             instr->operand[0] = mk_operand(size_reg, 0, 0, IMMEDIATE);
-            instr->immediate = get_immediate(realmode, opcode+1, 
instr->op_size);
             instr->operand[1] = mk_operand(size_reg, 0, 0, MEMORY);
 
             switch (ins_subtype) {

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