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HVC

Hypervisor Call causes an exception to EL2. Non-secure software executing at EL1 can use this instruction to call the hypervisor to request a service.

The HVC instruction is undefined:

  • At EL0, and Secure EL1.
  • When SCR_EL3.HCE is set to 0.

On executing an HVC instruction, the PE records the exception as a Hypervisor Call exception in ESR_ELx, using the EC value 0x16, and the value of the immediate argument.

313029282726252423222120191817161514131211109876543210
11010100000imm1600010

System

HVC #<imm>

// Empty.

Assembler Symbols

<imm>

Is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm16" field.

Operation

if !HaveEL(EL2) || PSTATE.EL == EL0 || (PSTATE.EL == EL1 && (!IsSecureEL2Enabled() && IsSecure())) then
    UNDEFINED;

hvc_enable = if HaveEL(EL3) then SCR_EL3.HCE else NOT(HCR_EL2.HCD);
if hvc_enable == '0' then
    AArch64.UndefinedFault();
else
    AArch64.CallHypervisor(imm16);
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