Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9299836e authored by Avi Kivity's avatar Avi Kivity
Browse files

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: default avatarAvi Kivity <avi@redhat.com>
parent de5f70e0

arch/x86/kvm/emulate.c

+18 −2
Original line number Diff line number Diff line
@@ -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 */