Sent: Thursday, June 20, 2013 1:23 PM
To: benh@kernel.crashing.org
Cc: linuxppc-dev@lists.ozlabs.org; linux-kernel@vger.kernel.org
Subject: [v2][PATCH 1/7] powerpc/book3e: support CONFIG_RELOCATABLE
=20
book3e is different with book3s since 3s includes the exception
vectors code in head_64.S as it relies on absolute addressing
which is only possible within this compilation unit. So we have
to get that label address with got.
=20
And when boot a relocated kernel, we should reset ipvr properly again
after .relocate.
=20
Signed-off-by: Tiejun Chen <redacted>
---
 arch/powerpc/include/asm/exception-64e.h |    8 ++++++++
 arch/powerpc/kernel/exceptions-64e.S     |   15 ++++++++++++++-
 arch/powerpc/kernel/head_64.S            |   22 ++++++++++++++++++++++
 arch/powerpc/lib/feature-fixups.c        |    7 +++++++
 4 files changed, 51 insertions(+), 1 deletion(-)
=20

diff --git a/arch/powerpc/include/asm/exception-64e.h

b/arch/powerpc/include/asm/exception-64e.h
index 51fa43e..89e940d 100644

--- a/arch/powerpc/include/asm/exception-64e.h
+++ b/arch/powerpc/include/asm/exception-64e.h

@@ -214,10 +214,18 @@ exc_##label##_book3e:
 #define TLB_MISS_STATS_SAVE_INFO_BOLTED
 #endif

=20
+#ifndef CONFIG_RELOCATABLE
 #define SET_IVOR(vector_number, vector_offset)	\
 	li	r3,vector_offset@l; 		\
 	ori	r3,r3,interrupt_base_book3e@l;	\
 	mtspr	SPRN_IVOR##vector_number,r3;
+#else
+#define SET_IVOR(vector_number, vector_offset)	\
+	LOAD_REG_ADDR(r3,interrupt_base_book3e);\
+	rlwinm	r3,r3,0,15,0;			\
+	ori	r3,r3,vector_offset@l;		\
+	mtspr	SPRN_IVOR##vector_number,r3;
+#endif
=20
 #endif /* _ASM_POWERPC_EXCEPTION_64E_H */
=20

diff --git a/arch/powerpc/kernel/exceptions-64e.S

b/arch/powerpc/kernel/exceptions-64e.S
index 645170a..4b23119 100644

--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S

@@ -1097,7 +1097,15 @@ skpinv:	addi	r6,r6,1				/*

Increment */
  * r4 =3D MAS0 w/TLBSEL & ESEL for the temp mapping
  */
 	/* Now we branch the new virtual address mapped by this entry */
+#ifdef CONFIG_RELOCATABLE
+	/* We have to find out address from lr. */
+	bl	1f		/* Find our address */
+1:	mflr	r6
+	addi	r6,r6,(2f - 1b)
+	tovirt(r6,r6)
+#else
 	LOAD_REG_IMMEDIATE(r6,2f)
+#endif
 	lis	r7,MSR_KERNEL@h
 	ori	r7,r7,MSR_KERNEL@l
 	mtspr	SPRN_SRR0,r6

@@ -1348,9 +1356,14 @@ _GLOBAL(book3e_secondary_thread_init)
 	mflr	r28
 	b	3b

=20
-_STATIC(init_core_book3e)
+_GLOBAL(init_core_book3e)
 	/* Establish the interrupt vector base */
+#ifdef CONFIG_RELOCATABLE
+	tovirt(r2,r2)
+	LOAD_REG_ADDR(r3, interrupt_base_book3e)
+#else
 	LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
+#endif
 	mtspr	SPRN_IVPR,r3
 	sync
 	blr

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.=

index b61363d..0942f3a 100644

--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S

@@ -414,12 +414,22 @@ _STATIC(__after_prom_start)
 	/* process relocations for the final address of the kernel */
 	lis	r25,PAGE_OFFSET@highest	/* compute virtual base of kernel */
 	sldi	r25,r25,32
+#if defined(CONFIG_PPC_BOOK3E)
+	tovirt(r26,r26)			/* on booke, we already run at

PAGE_OFFSET */
+#endif
 	lwz	r7,__run_at_load-_stext(r26)
+#if defined(CONFIG_PPC_BOOK3E)
+	tophys(r26,r26)			/* Restore for the remains. */
+#endif
 	cmplwi	cr0,r7,1	/* flagged to stay where we are ? */
 	bne	1f
 	add	r25,r25,r26
 1:	mr	r3,r25
 	bl	.relocate
+#if defined(CONFIG_PPC_BOOK3E)
+	/* We should set ivpr again after .relocate. */
+	bl	.init_core_book3e
+#endif
 #endif
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 /*

@@ -447,12 +457,24 @@ _STATIC(__after_prom_start)
  * variable __run_at_load, if it is set the kernel is treated as relocat=

  * kernel, otherwise it will be moved to PHYSICAL_START
  */
+#if defined(CONFIG_PPC_BOOK3E)
+	tovirt(r26,r26)			/* on booke, we already run at
PAGE_OFFSET */
+#endif
 	lwz	r7,__run_at_load-_stext(r26)
+#if defined(CONFIG_PPC_BOOK3E)
+	tophys(r26,r26)			/* Restore for the remains. */
+#endif
 	cmplwi	cr0,r7,1
 	bne	3f
=20
+#ifdef CONFIG_PPC_BOOK3E
+	LOAD_REG_ADDR(r5, interrupt_end_book3e)
+	LOAD_REG_ADDR(r11, _stext)
+	sub	r5,r5,r11
+#else
 	/* just copy interrupts */
 	LOAD_REG_IMMEDIATE(r5, __end_interrupts - _stext)
+#endif
 	b	5f
 3:
 #endif

diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature=

fixups.c
index 7a8a748..13f20ed 100644

--- a/arch/powerpc/lib/feature-fixups.c
+++ b/arch/powerpc/lib/feature-fixups.c

@@ -135,13 +135,20 @@ void do_final_fixups(void)
 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
 	int *src, *dest;
 	unsigned long length;
+#ifdef CONFIG_PPC_BOOK3E
+	extern char interrupt_end_book3e[];
+#endif