Will be required for obtaining the ID of the current CPU in shared PSCI functions. The default implementation requires a dense ID space and only supports a single cluster. Therefore, the functions can be overloaded in cases where these assumptions do not hold.
CC: Marc Zyngier marc.zyngier@arm.com Signed-off-by: Jan Kiszka jan.kiszka@siemens.com --- arch/arm/cpu/armv7/psci.S | 8 ++++++++ arch/arm/cpu/armv7/sunxi/psci.S | 12 +++++++----- 2 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S index bf11a34..0df6633 100644 --- a/arch/arm/cpu/armv7/psci.S +++ b/arch/arm/cpu/armv7/psci.S @@ -99,4 +99,12 @@ _smc_psci: pop {r4-r7, lr} movs pc, lr @ Return to the kernel
+@ Requires dense and single-cluste CPU ID space +ENTRY(psci_get_cpu_id) + mrc p15, 0, r0, c0, c0, 5 /* read MPIDR */ + and r0, r0, #0xff /* return CPU ID in cluster */ + bx lr +ENDPROC(psci_get_cpu_id) +.weak psci_get_cpu_id + .popsection diff --git a/arch/arm/cpu/armv7/sunxi/psci.S b/arch/arm/cpu/armv7/sunxi/psci.S index 9e898f2..e29ae65 100644 --- a/arch/arm/cpu/armv7/sunxi/psci.S +++ b/arch/arm/cpu/armv7/sunxi/psci.S @@ -19,6 +19,7 @@
#include <config.h> #include <asm/gic.h> +#include <asm/macro.h> #include <asm/psci.h> #include <asm/arch/cpu.h>
@@ -290,6 +291,8 @@ psci_cpu_off:
.globl psci_arch_init psci_arch_init: + mov r6, lr + movw r4, #(GICD_BASE & 0xffff) movt r4, #(GICD_BASE >> 16)
@@ -315,18 +318,17 @@ psci_arch_init: mcr p15, 0, r5, c1, c1, 0 @ Write SCR isb
- mrc p15, 0, r4, c0, c0, 5 @ MPIDR - and r4, r4, #3 @ cpu number in cluster + bl psci_get_cpu_id mov r5, #0x400 @ 1kB of stack per CPU - mul r4, r4, r5 + mul r0, r0, r5
adr r5, text_end @ end of text add r5, r5, #0x2000 @ Skip two pages lsr r5, r5, #12 @ Align to start of page lsl r5, r5, #12 - sub sp, r5, r4 @ here's our stack! + sub sp, r5, r0 @ here's our stack!
- bx lr + bx r6
text_end: .popsection