The ICC_AP1R<n>_EL1 characteristics are:
Provides information about Group 1 active priorities.
This register is banked between ICC_AP1R<n>_EL1 and ICC_AP1R<n>_EL1_S and ICC_AP1R<n>_EL1_NS.
AArch64 System register ICC_AP1R<n>_EL1 bits [31:0] (ICC_AP1R<n>_EL1_S) are architecturally mapped to AArch32 System register ICC_AP1R<n>[31:0] (ICC_AP1R<n>_S).
AArch64 System register ICC_AP1R<n>_EL1 bits [31:0] (ICC_AP1R<n>_EL1_NS) are architecturally mapped to AArch32 System register ICC_AP1R<n>[31:0] (ICC_AP1R<n>_NS).
This register is present only when GICv3 is implemented. Otherwise, direct accesses to ICC_AP1R<n>_EL1 are UNDEFINED.
ICC_AP1R<n>_EL1 is a 64-bit register.
This register has the following instances:
| 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 |
| NMI | RES0 | ||||||||||||||||||||||||||||||
| IMPLEMENTATION DEFINED | |||||||||||||||||||||||||||||||
Indicates whether there is an active NMI priority.
| NMI | Meaning |
|---|---|
| 0b0 |
There is no active Group 1 NMI, or all active Group 1 NMIs have undergone priority drop. |
| 0b1 |
There is an active Group 1 NMI. |
The reset behavior of this field is:
Reserved, RES0.
Reserved, RES0.
IMPLEMENTATION DEFINED.
The reset behavior of this field is:
The contents of these registers are IMPLEMENTATION DEFINED with the one architectural requirement that the value 0x00000000 is consistent with no interrupts being active.
Writing to these registers with any value other than the last read value of the register (or 0x00000000 when there are no Group 1 active priorities) might result in UNPREDICTABLE behavior of the interrupt prioritization system, causing:
ICC_AP1R1_EL1 is implemented only in implementations that support 6 or more bits of priority. ICC_AP1R2_EL1 and ICC_AP1R3_EL1 are implemented only in implementations that support 7 or more bits of priority. Unimplemented registers are UNDEFINED.
The number of bits of preemption is indicated by ICH_VTR_EL2.PREbits.
Writing to the active priority registers in any order other than the following order will result in UNPREDICTABLE behavior:
Accesses to this register use the following encodings in the System register encoding space:
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b1100 | 0b1001 | 0b0:m[1:0] |
integer m = UInt(op2<1:0>); if m == 1 && NUM_GIC_PRIORITY_BITS < 6 then UNDEFINED; elsif (m == 2 || m == 3) && NUM_GIC_PRIORITY_BITS < 7 then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.IRQ == '1' then UNDEFINED; elsif ICC_SRE_EL1.SRE == '0' then AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && ICH_HCR_EL2.TALL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.IMO == '1' then X[t, 64] = ICV_AP1R_EL1[m]; elsif HaveEL(EL3) && SCR_EL3.IRQ == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) then if SCR_EL3.NS == '0' then X[t, 64] = ICC_AP1R_EL1_S[m]; else X[t, 64] = ICC_AP1R_EL1_NS[m]; else X[t, 64] = ICC_AP1R_EL1[m]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.IRQ == '1' then UNDEFINED; elsif ICC_SRE_EL2.SRE == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.IRQ == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) then if SCR_EL3.NS == '0' then X[t, 64] = ICC_AP1R_EL1_S[m]; else X[t, 64] = ICC_AP1R_EL1_NS[m]; else X[t, 64] = ICC_AP1R_EL1[m]; elsif PSTATE.EL == EL3 then if ICC_SRE_EL3.SRE == '0' then AArch64.SystemAccessTrap(EL3, 0x18); else if SCR_EL3.NS == '0' then X[t, 64] = ICC_AP1R_EL1_S[m]; else X[t, 64] = ICC_AP1R_EL1_NS[m];
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b1100 | 0b1001 | 0b0:m[1:0] |
integer m = UInt(op2<1:0>); if m == 1 && NUM_GIC_PRIORITY_BITS < 6 then UNDEFINED; elsif (m == 2 || m == 3) && NUM_GIC_PRIORITY_BITS < 7 then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.IRQ == '1' then UNDEFINED; elsif ICC_SRE_EL1.SRE == '0' then AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && ICH_HCR_EL2.TALL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.IMO == '1' then ICV_AP1R_EL1[m] = X[t, 64]; elsif HaveEL(EL3) && SCR_EL3.IRQ == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) then if SCR_EL3.NS == '0' then ICC_AP1R_EL1_S[m] = X[t, 64]; else ICC_AP1R_EL1_NS[m] = X[t, 64]; else ICC_AP1R_EL1[m] = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.IRQ == '1' then UNDEFINED; elsif ICC_SRE_EL2.SRE == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.IRQ == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) then if SCR_EL3.NS == '0' then ICC_AP1R_EL1_S[m] = X[t, 64]; else ICC_AP1R_EL1_NS[m] = X[t, 64]; else ICC_AP1R_EL1[m] = X[t, 64]; elsif PSTATE.EL == EL3 then if ICC_SRE_EL3.SRE == '0' then AArch64.SystemAccessTrap(EL3, 0x18); else if SCR_EL3.NS == '0' then ICC_AP1R_EL1_S[m] = X[t, 64]; else ICC_AP1R_EL1_NS[m] = X[t, 64];
26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6
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