RVBAR_EL1, Reset Vector Base Address Register (if EL2 and EL3 not implemented)

The RVBAR_EL1 characteristics are:

Purpose

If EL1 is the highest Exception level implemented, contains the IMPLEMENTATION DEFINED address that execution starts from after reset when executing in AArch64 state.

Configuration

This register is present only when the highest implemented Exception level is EL1 and FEAT_AA64 is implemented. Otherwise, direct accesses to RVBAR_EL1 are UNDEFINED.

Attributes

RVBAR_EL1 is a 64-bit register.

Field descriptions

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ResetAddress
ResetAddress

ResetAddress, bits [63:0]

The IMPLEMENTATION DEFINED address that execution starts from after reset when executing in 64-bit state. Bits[1:0] of this register are 00, as this address must be aligned, and the address must be within the physical address size supported by the PE.

This field has an IMPLEMENTATION DEFINED value.

Access to this field is RO.

Accessing RVBAR_EL1

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, RVBAR_EL1

op0	op1	CRn	CRm	op2
0b11	0b000	0b1100	0b0000	0b001

if !(IsHighestEL(EL1) && IsFeatureImplemented(FEAT_AA64)) then UNDEFINED; elsif PSTATE.EL == EL1 && IsHighestEL(EL1) then X[t, 64] = RVBAR_EL1; else UNDEFINED;

21/03/2025 17:52; 154105dd5041532b480d9ef0c018b8420cbe5c19