Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753546Ab3GIIGB (ORCPT ); Tue, 9 Jul 2013 04:06:01 -0400 Received: from mail1.windriver.com ([147.11.146.13]:42896 "EHLO mail1.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753582Ab3GIICr (ORCPT ); Tue, 9 Jul 2013 04:02:47 -0400 From: Tiejun Chen To: CC: , Subject: [v3][PATCH 2/8] powerpc/book3e: support CONFIG_RELOCATABLE Date: Tue, 9 Jul 2013 16:03:21 +0800 Message-ID: <1373357007-30785-3-git-send-email-tiejun.chen@windriver.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1373357007-30785-1-git-send-email-tiejun.chen@windriver.com> References: <1373357007-30785-1-git-send-email-tiejun.chen@windriver.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4657 Lines: 143 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. And when boot a relocated kernel, we should reset ipvr properly again after .relocate. Signed-off-by: Tiejun Chen --- arch/powerpc/include/asm/exception-64e.h | 11 +++++++++++ arch/powerpc/kernel/exceptions-64e.S | 18 +++++++++++++++++- arch/powerpc/kernel/head_64.S | 25 +++++++++++++++++++++++++ 3 files changed, 53 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/exception-64e.h b/arch/powerpc/include/asm/exception-64e.h index 51fa43e..371a77f 100644 --- a/arch/powerpc/include/asm/exception-64e.h +++ b/arch/powerpc/include/asm/exception-64e.h @@ -214,10 +214,21 @@ exc_##label##_book3e: #define TLB_MISS_STATS_SAVE_INFO_BOLTED #endif +#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 /* !CONFIG_RELOCATABLE */ +/* In relocatable case the value of the constant expression 'expr' is only + * offset. So instead, we should loads the address of label 'name'. + */ +#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 /* CONFIG_RELOCATABLE */ #endif /* _ASM_POWERPC_EXCEPTION_64E_H */ diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index a518e48..be3b4b1 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 = 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 +1356,17 @@ _GLOBAL(book3e_secondary_thread_init) mflr r28 b 3b -_STATIC(init_core_book3e) +_GLOBAL(init_core_book3e) /* Establish the interrupt vector base */ +#ifdef CONFIG_RELOCATABLE +/* In relocatable case the value of the constant expression 'expr' is only + * offset. So instead, we should loads the address of label 'name'. + */ + 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.S index b61363d..550f8fb 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -414,12 +414,25 @@ _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) + /* In relocatable case we always have to load the address of label 'name' + * to set IVPR. So after .relocate we have to update IVPR with current + * address of label. + */ + bl .init_core_book3e +#endif #endif /* @@ -447,12 +460,24 @@ _STATIC(__after_prom_start) * variable __run_at_load, if it is set the kernel is treated as relocatable * 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 +#ifdef CONFIG_PPC_BOOK3E + LOAD_REG_ADDR(r5, __end_interrupts) + 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 -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/