diff options
| author | Avi Kivity <avi@redhat.com> | 2012-06-13 12:25:06 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-07-09 14:19:04 +0300 |
| commit | 9299836e6379d5703826a540fb3c704223fac520 (patch) | |
| tree | d32fa89b033a17b5153fb2f95f15c79827ace5ac | |
| parent | de5f70e0c65fcd0472a412a7a9690afcd3ee4526 (diff) | |
KVM: x86 emulator: emulate BSWAP
Opcodes 0F C8 - 0F CF.
Used by the SeaBIOS cdrom code (though not in big real mode).
Signed-off-by: Avi Kivity <avi@redhat.com>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index b4b326ebc83..cfa5cc30c1d 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3264,6 +3264,21 @@ static int em_lahf(struct x86_emulate_ctxt *ctxt) return X86EMUL_CONTINUE; } +static int em_bswap(struct x86_emulate_ctxt *ctxt) +{ + switch (ctxt->op_bytes) { +#ifdef CONFIG_X86_64 + case 8: + asm("bswap %0" : "+r"(ctxt->dst.val)); + break; +#endif + default: + asm("bswap %0" : "+r"(*(u32 *)&ctxt->dst.val)); + break; + } + return X86EMUL_CONTINUE; +} + static bool valid_cr(int nr) { switch (nr) { @@ -3780,11 +3795,12 @@ static struct opcode twobyte_table[256] = { I(DstMem | SrcReg | ModRM | BitOp | Lock | PageTable, em_btc), I(DstReg | SrcMem | ModRM, em_bsf), I(DstReg | SrcMem | ModRM, em_bsr), D(DstReg | SrcMem8 | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), - /* 0xC0 - 0xCF */ + /* 0xC0 - 0xC7 */ D2bv(DstMem | SrcReg | ModRM | Lock), N, D(DstMem | SrcReg | ModRM | Mov), N, N, N, GD(0, &group9), - N, N, N, N, N, N, N, N, + /* 0xC8 - 0xCF */ + X8(I(DstReg, em_bswap)), /* 0xD0 - 0xDF */ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, /* 0xE0 - 0xEF */ |