# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Date 1159610921 -3600
# Node ID 2d155d41fe466952c8b9b871b4500b7f7a29f088
# Parent a949bd6ceb85d4ee11a2fd896487299427a41592
[HVM] Add sub instruction support to HVM MMIO decoder.
This is needed for SMP PAE windows XP SP2.
Signed-off-by: Xin Li <xin.b.li@xxxxxxxxx>
---
xen/arch/x86/hvm/io.c | 3 +++
xen/arch/x86/hvm/platform.c | 6 ++++++
xen/include/asm-x86/hvm/io.h | 1 +
3 files changed, 10 insertions(+)
diff -r a949bd6ceb85 -r 2d155d41fe46 xen/arch/x86/hvm/io.c
--- a/xen/arch/x86/hvm/io.c Sat Sep 30 10:49:08 2006 +0100
+++ b/xen/arch/x86/hvm/io.c Sat Sep 30 11:08:41 2006 +0100
@@ -596,6 +596,7 @@ static void hvm_mmio_assist(struct cpu_u
break;
case INSTR_CMP:
+ case INSTR_SUB:
if (src & REGISTER) {
index = operand_index(src);
value = get_reg_value(size, index, 0, regs);
@@ -607,6 +608,8 @@ static void hvm_mmio_assist(struct cpu_u
index = operand_index(dst);
value = get_reg_value(size, index, 0, regs);
diff = value - (unsigned long) p->u.data;
+ if ( mmio_opp->instr == INSTR_SUB )
+ set_reg_value(size, index, 0, regs, diff);
}
/*
diff -r a949bd6ceb85 -r 2d155d41fe46 xen/arch/x86/hvm/platform.c
--- a/xen/arch/x86/hvm/platform.c Sat Sep 30 10:49:08 2006 +0100
+++ b/xen/arch/x86/hvm/platform.c Sat Sep 30 11:08:41 2006 +0100
@@ -394,6 +394,11 @@ static int hvm_decode(int realmode, unsi
GET_OP_SIZE_FOR_NONEBYTE(instr->op_size);
return mem_reg(instr->op_size, opcode, instr, rex);
+ case 0x2B: /* sub m32/16, r32/16 */
+ instr->instr = INSTR_SUB;
+ GET_OP_SIZE_FOR_NONEBYTE(instr->op_size);
+ return mem_reg(instr->op_size, opcode, instr, rex);
+
case 0x30: /* xor r8, m8 */
instr->instr = INSTR_XOR;
instr->op_size = BYTE;
@@ -1011,6 +1016,7 @@ void handle_mmio(unsigned long va, unsig
case INSTR_CMP: /* Pass through */
case INSTR_TEST:
+ case INSTR_SUB:
mmio_opp->flags = mmio_inst.flags;
mmio_opp->instr = mmio_inst.instr;
mmio_opp->operand[0] = mmio_inst.operand[0]; /* source */
diff -r a949bd6ceb85 -r 2d155d41fe46 xen/include/asm-x86/hvm/io.h
--- a/xen/include/asm-x86/hvm/io.h Sat Sep 30 10:49:08 2006 +0100
+++ b/xen/include/asm-x86/hvm/io.h Sat Sep 30 11:08:41 2006 +0100
@@ -68,6 +68,7 @@
#define INSTR_TEST 12
#define INSTR_BT 13
#define INSTR_XCHG 14
+#define INSTR_SUB 15
struct instruction {
__s8 instr; /* instruction type */
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