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.code16
.intel_syntax noprefix
.section .boot, "ax", @progbits
// Trigger `KVM_EXIT_IO:KVM_EXIT_IO_OUT` by writing string to output port.
mov dx, 0x1000 // Output port.
lea si, [msg] // Address of string.
mov cx, [msg_len] // Len of string.
rep outsb // Write byte from ds:si to output port dx.
// Trigger `KVM_EXIT_IO:KVM_EXIT_IO_IN` by reading byte to memory from input port.
mov dx, 0x1000 // Input port.
lea di, [in_dest] // Destination address.
insb // Read byte from input port dx to ds:di.
// Trigger `KVM_EXIT_MMIO (w)` by writing to non mapped physical address.
mov byte ptr ds:[0x2000], 0xaa
// Trigger `KVM_EXIT_MMIO (r)` by reading from non mapped physical address.
mov al, byte ptr ds:[0x2000]
// Trigger `KVM_EXIT_HLT`.
hlt
.section .rodata, "a", @progbits
msg:
.asciz "Hello from Real Mode!\n"
msg_len:
.2byte .-msg
in_dest:
.byte 0x00
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