diff options
| author | Hongbo Zhang <hongbo.zhang@nxp.com> | 2016-07-21 18:09:37 +0800 |
|---|---|---|
| committer | York Sun <york.sun@nxp.com> | 2016-07-26 09:02:44 -0700 |
| commit | 7e742c276dea455d9439caa3f6bc3f4e9a1b5796 (patch) | |
| tree | 96dd12df63eddd136030b4b884a716a46f6a81e5 /arch/arm/cpu/armv7/ls102xa | |
| parent | 116339d460f79911d1b87fa65753d966aaf8b7b9 (diff) | |
ARMv7: PSCI: ls102xa: check target CPU ID before further operations
The input parameter CPU ID needs to be validated before furher oprations such
as CPU_ON, this patch introduces the function to do this.
Signed-off-by: Wang Dongsheng <dongsheng.wang@nxp.com>
Signed-off-by: Hongbo Zhang <hongbo.zhang@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
Diffstat (limited to 'arch/arm/cpu/armv7/ls102xa')
| -rw-r--r-- | arch/arm/cpu/armv7/ls102xa/psci.S | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/arch/arm/cpu/armv7/ls102xa/psci.S b/arch/arm/cpu/armv7/ls102xa/psci.S index f9b26b4321..cba9c1e1aa 100644 --- a/arch/arm/cpu/armv7/ls102xa/psci.S +++ b/arch/arm/cpu/armv7/ls102xa/psci.S @@ -25,6 +25,36 @@ #define ONE_MS (GENERIC_TIMER_CLK / 1000) #define RESET_WAIT (30 * ONE_MS) +@ r0: return value ARM_PSCI_RET_SUCCESS or ARM_PSCI_RET_INVAL +@ r1: input target CPU ID in MPIDR format, original value in r1 may be dropped +@ r4: output validated CPU ID if ARM_PSCI_RET_SUCCESS returns, meaningless for +@ ARM_PSCI_RET_INVAL,suppose caller saves r4 before calling +LENTRY(psci_check_target_cpu_id) + @ Get the real CPU number + and r4, r1, #0xff + mov r0, #ARM_PSCI_RET_INVAL + + @ Bit[31:24], bits must be zero. + tst r1, #0xff000000 + bxne lr + + @ Affinity level 2 - Cluster: only one cluster in LS1021xa. + tst r1, #0xff0000 + bxne lr + + @ Affinity level 1 - Processors: should be in 0xf00 format. + lsr r1, r1, #8 + teq r1, #0xf + bxne lr + + @ Affinity level 0 - CPU: only 0, 1 are valid in LS1021xa. + cmp r4, #2 + bxge lr + + mov r0, #ARM_PSCI_RET_SUCCESS + bx lr +ENDPROC(psci_check_target_cpu_id) + @ r1 = target CPU @ r2 = target PC .globl psci_cpu_on @@ -33,7 +63,9 @@ psci_cpu_on: @ Clear and Get the correct CPU number @ r1 = 0xf01 - and r4, r1, #0xff + bl psci_check_target_cpu_id + cmp r0, #ARM_PSCI_RET_INVAL + beq out_psci_cpu_on mov r0, r4 mov r1, r2 @@ -101,6 +133,7 @@ holdoff_release: @ Return mov r0, #ARM_PSCI_RET_SUCCESS +out_psci_cpu_on: pop {r4, r5, r6, lr} bx lr |