Thread (32 messages) 32 messages, 7 authors, 2011-02-28
STALE5574d

[PATCH v3 2/5] ARM: pm: add generic CPU suspend/resume support

From: Russell King - ARM Linux <hidden>
Date: 2011-02-08 12:33:22
Subsystem: arm port, the rest · Maintainers: Russell King, Linus Torvalds

On Tue, Feb 08, 2011 at 11:23:23AM +0000, Russell King - ARM Linux wrote:
quoted
The same goes for the stack pointer global variable which should be
per cpu.
Yes, but this is what is currently done, so at the present time I'm
just sorting out what's already in the kernel.  If we need further
changes, then that needs to be built on top of this.
Like this:

 arch/arm/kernel/sleep.S |   26 +++++++++++++++++++++++++-
 1 files changed, 25 insertions(+), 1 deletions(-)
diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index 9f106fa..e10618f 100644
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -25,7 +25,14 @@ ENTRY(cpu_suspend)
 	stmfd	sp!, {r1, r2, r3, ip}	@ save v:p, virt SP, retfn, phys resume fn
 	ldr	r3, =sleep_save_sp
 	add	r2, sp, r1		@ convert SP to phys
+#ifdef CONFIG_SMP
+	ALT_SMP(mrc p15, 0, lr, c0, c0, 5)
+	ALT_UP(mov lr, #0)
+	and	lr, lr, #15
+	str	r2, [r3, lr, lsl #2]	@ save phys SP
+#else
 	str	r2, [r3]		@ save phys SP
+#endif
 	mov	lr, pc
 	ldr	pc, [r10, #CPU_DO_SUSPEND] @ save CPU state
 #else
@@ -36,7 +43,14 @@ ENTRY(cpu_suspend)
 	stmfd	sp!, {r1, r2, r3}	@ save v:p, virt SP, return fn
 	ldr	r3, =sleep_save_sp
 	add	r2, sp, r1		@ convert SP to phys
+#ifdef CONFIG_SMP
+	ALT_SMP(mrc p15, 0, lr, c0, c0, 5)
+	ALT_UP(mov lr, #0)
+	and	lr, lr, #15
+	str	r2, [r3, lr, lsl #2]	@ save phys SP
+#else
 	str	r2, [r3]		@ save phys SP
+#endif
 	bl	cpu_do_suspend
 #endif
 
@@ -96,7 +110,15 @@ cpu_resume_after_mmu:
 	.data
 	.align
 ENTRY(cpu_resume)
+#ifdef CONFIG_SMP
+	adr	r0, sleep_save_sp
+	ALT_SMP(mrc p15, 0, r1, c0, c0, 5)
+	ALT_UP(mov r1, #0)
+	and	r1, r1, #15
+	ldr	r0, [r0, r1, lsl #2]	@ stack phys addr
+#else
 	ldr	r0, sleep_save_sp	@ stack phys addr
+#endif
 	msr	cpsr_c, #PSR_I_BIT | PSR_F_BIT | SVC_MODE @ set SVC, irqs off
 #ifdef MULTI_CPU
 	ldmia	r0!, {r1, sp, lr, pc}	@ load v:p, stack, return fn, resume fn
@@ -107,4 +129,6 @@ ENTRY(cpu_resume)
 ENDPROC(cpu_resume)
 
 sleep_save_sp:
-	.word	0				@ preserve stack phys ptr here
+	.rept	CONFIG_NR_CPUS
+	.long	0				@ preserve stack phys ptr here
+	.endr
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help