5 files changed, 65 insertions, 27 deletions

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 92768d3006f..e9c4044012b 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -122,6 +122,8 @@ int main(void)
 	DEFINE(PACASTABRR, offsetof(struct paca_struct, stab_rr));
 	DEFINE(PACAR1, offsetof(struct paca_struct, saved_r1));
 	DEFINE(PACATOC, offsetof(struct paca_struct, kernel_toc));
+	DEFINE(PACAKBASE, offsetof(struct paca_struct, kernelbase));
+	DEFINE(PACAKMSR, offsetof(struct paca_struct, kernel_msr));
 	DEFINE(PACASOFTIRQEN, offsetof(struct paca_struct, soft_enabled));
 	DEFINE(PACAHARDIRQEN, offsetof(struct paca_struct, hard_enabled));
 	DEFINE(PACASLBCACHE, offsetof(struct paca_struct, slb_cache));
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 27935d1ab6a..97bb6e6f67b 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -82,7 +82,11 @@ END_FTR_SECTION(0, 1)
 	/* Catch branch to 0 in real mode */
 	trap
 
-	/* Secondary processors spin on this value until it goes to 1. */
+	/* Secondary processors spin on this value until it becomes nonzero.
+	 * When it does it contains the real address of the descriptor
+	 * of the function that the cpu should jump to to continue
+	 * initialization.
+	 */
 	.globl  __secondary_hold_spinloop
 __secondary_hold_spinloop:
 	.llong	0x0
@@ -109,8 +113,11 @@ __secondary_hold_acknowledge:
  * before the bulk of the kernel has been relocated.  This code
  * is relocated to physical address 0x60 before prom_init is run.
  * All of it must fit below the first exception vector at 0x100.
+ * Use .globl here not _GLOBAL because we want __secondary_hold
+ * to be the actual text address, not a descriptor.
  */
-_GLOBAL(__secondary_hold)
+	.globl	__secondary_hold
+__secondary_hold:
 	mfmsr	r24
 	ori	r24,r24,MSR_RI
 	mtmsrd	r24			/* RI on */
@@ -126,11 +133,11 @@ _GLOBAL(__secondary_hold)
 
 	/* All secondary cpus wait here until told to start. */
 100:	ld	r4,__secondary_hold_spinloop@l(0)
-	cmpdi	0,r4,1
-	bne	100b
+	cmpdi	0,r4,0
+	beq	100b
 
 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
-	LOAD_REG_IMMEDIATE(r4, .generic_secondary_smp_init)
+	ld	r4,0(r4)		/* deref function descriptor */
 	mtctr	r4
 	mr	r3,r24
 	bctr
@@ -147,6 +154,10 @@ exception_marker:
 /*
  * This is the start of the interrupt handlers for pSeries
  * This code runs with relocation off.
+ * Code from here to __end_interrupts gets copied down to real
+ * address 0x100 when we are running a relocatable kernel.
+ * Therefore any relative branches in this section must only
+ * branch to labels in this section.
  */
 	. = 0x100
 	.globl __start_interrupts
@@ -200,7 +211,20 @@ data_access_slb_pSeries:
 	mfspr	r10,SPRN_SPRG1
 	std	r10,PACA_EXSLB+EX_R13(r13)
 	mfspr	r12,SPRN_SRR1		/* and SRR1 */
-	b	.slb_miss_realmode	/* Rel. branch works in real mode */
+#ifndef CONFIG_RELOCATABLE
+	b	.slb_miss_realmode
+#else
+	/*
+	 * We can't just use a direct branch to .slb_miss_realmode
+	 * because the distance from here to there depends on where
+	 * the kernel ends up being put.
+	 */
+	mfctr	r11
+	ld	r10,PACAKBASE(r13)
+	LOAD_HANDLER(r10, .slb_miss_realmode)
+	mtctr	r10
+	bctr
+#endif
 
 	STD_EXCEPTION_PSERIES(0x400, instruction_access)
 
@@ -225,7 +249,15 @@ instruction_access_slb_pSeries:
 	mfspr	r10,SPRN_SPRG1
 	std	r10,PACA_EXSLB+EX_R13(r13)
 	mfspr	r12,SPRN_SRR1		/* and SRR1 */
-	b	.slb_miss_realmode	/* Rel. branch works in real mode */
+#ifndef CONFIG_RELOCATABLE
+	b	.slb_miss_realmode
+#else
+	mfctr	r11
+	ld	r10,PACAKBASE(r13)
+	LOAD_HANDLER(r10, .slb_miss_realmode)
+	mtctr	r10
+	bctr
+#endif
 
 	MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt)
 	STD_EXCEPTION_PSERIES(0x600, alignment)
@@ -244,14 +276,12 @@ BEGIN_FTR_SECTION
 	beq-	1f
 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
 	mr	r9,r13
-	mfmsr	r10
 	mfspr	r13,SPRN_SPRG3
 	mfspr	r11,SPRN_SRR0
-	clrrdi	r12,r13,32
-	oris	r12,r12,system_call_common@h
-	ori	r12,r12,system_call_common@l
+	ld	r12,PACAKBASE(r13)
+	ld	r10,PACAKMSR(r13)
+	LOAD_HANDLER(r12, system_call_entry)
 	mtspr	SPRN_SRR0,r12
-	ori	r10,r10,MSR_IR|MSR_DR|MSR_RI
 	mfspr	r12,SPRN_SRR1
 	mtspr	SPRN_SRR1,r10
 	rfid
@@ -379,7 +409,10 @@ __end_interrupts:
 
 /*
  * Code from here down to __end_handlers is invoked from the
- * exception prologs above.
+ * exception prologs above.  Because the prologs assemble the
+ * addresses of these handlers using the LOAD_HANDLER macro,
+ * which uses an addi instruction, these handlers must be in
+ * the first 32k of the kernel image.
  */
 
 /*** Common interrupt handlers ***/
@@ -419,6 +452,10 @@ machine_check_common:
 	STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception)
 #endif /* CONFIG_CBE_RAS */
 
+	.align	7
+system_call_entry:
+	b	system_call_common
+
 /*
  * Here we have detected that the kernel stack pointer is bad.
  * R9 contains the saved CR, r13 points to the paca,
@@ -562,6 +599,9 @@ unrecov_user_slb:
  */
 _GLOBAL(slb_miss_realmode)
 	mflr	r10
+#ifdef CONFIG_RELOCATABLE
+	mtctr	r11
+#endif
 
 	stw	r9,PACA_EXSLB+EX_CCR(r13)	/* save CR in exc. frame */
 	std	r10,PACA_EXSLB+EX_LR(r13)	/* save LR */
@@ -612,11 +652,10 @@ BEGIN_FW_FTR_SECTION
 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES)
 #endif /* CONFIG_PPC_ISERIES */
 	mfspr	r11,SPRN_SRR0
-	clrrdi	r10,r13,32
+	ld	r10,PACAKBASE(r13)
 	LOAD_HANDLER(r10,unrecov_slb)
 	mtspr	SPRN_SRR0,r10
-	mfmsr	r10
-	ori	r10,r10,MSR_IR|MSR_DR|MSR_RI
+	ld	r10,PACAKMSR(r13)
 	mtspr	SPRN_SRR1,r10
 	rfid
 	b	.
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index c9bf17eec31..623e8c3c57f 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -79,6 +79,8 @@ void __init initialise_pacas(void)
 		new_paca->lock_token = 0x8000;
 		new_paca->paca_index = cpu;
 		new_paca->kernel_toc = kernel_toc;
+		new_paca->kernelbase = KERNELBASE;
+		new_paca->kernel_msr = MSR_KERNEL;
 		new_paca->hw_cpu_id = 0xffff;
 		new_paca->slb_shadow_ptr = &slb_shadow[cpu];
 		new_paca->__current = &init_task;
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index b72849ac7db..1f898858505 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1321,7 +1321,7 @@ static void __init prom_initialize_tce_table(void)
  *
  * -- Cort
  */
-extern void __secondary_hold(void);
+extern char __secondary_hold;
 extern unsigned long __secondary_hold_spinloop;
 extern unsigned long __secondary_hold_acknowledge;
 
@@ -1342,13 +1342,7 @@ static void __init prom_hold_cpus(void)
 		= (void *) LOW_ADDR(__secondary_hold_spinloop);
 	unsigned long *acknowledge
 		= (void *) LOW_ADDR(__secondary_hold_acknowledge);
-#ifdef CONFIG_PPC64
-	/* __secondary_hold is actually a descriptor, not the text address */
-	unsigned long secondary_hold
-		= __pa(*PTRRELOC((unsigned long *)__secondary_hold));
-#else
 	unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
-#endif
 
 	prom_debug("prom_hold_cpus: start...\n");
 	prom_debug("    1) spinloop       = 0x%x\n", (unsigned long)spinloop);
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 8b25f51f03b..843c0af210d 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -255,9 +255,11 @@ void early_setup_secondary(void)
 #endif /* CONFIG_SMP */
 
 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
+extern unsigned long __secondary_hold_spinloop;
+extern void generic_secondary_smp_init(void);
+
 void smp_release_cpus(void)
 {
-	extern unsigned long __secondary_hold_spinloop;
 	unsigned long *ptr;
 
 	DBG(" -> smp_release_cpus()\n");
@@ -266,12 +268,11 @@ void smp_release_cpus(void)
 	 * all now so they can start to spin on their individual paca
 	 * spinloops. For non SMP kernels, the secondary cpus never get out
 	 * of the common spinloop.
-	 * This is useless but harmless on iSeries, secondaries are already
-	 * waiting on their paca spinloops. */
+	 */
 
 	ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
 			- PHYSICAL_START);
-	*ptr = 1;
+	*ptr = __pa(generic_secondary_smp_init);
 	mb();
 
 	DBG(" <- smp_release_cpus()\n");