From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753653AbcCRQsI (ORCPT ); Fri, 18 Mar 2016 12:48:08 -0400 Received: from mail-wm0-f54.google.com ([74.125.82.54]:36209 "EHLO mail-wm0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751410AbcCRQsC (ORCPT ); Fri, 18 Mar 2016 12:48:02 -0400 From: Ard Biesheuvel To: linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, matt@codeblueprint.co.uk, catalin.marinas@arm.com, will.deacon@arm.com, linux@arm.linux.org.uk, pjones@redhat.com, dh.herrmann@gmail.com Cc: leif.lindholm@linaro.org, mark.rutland@arm.com, x86@kernel.org, Ard Biesheuvel Subject: [PATCH v2 5/9] efi/arm64: libstub: make screen_info accessible to the UEFI stub Date: Fri, 18 Mar 2016 17:47:37 +0100 Message-Id: <1458319661-19762-6-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1458319661-19762-1-git-send-email-ard.biesheuvel@linaro.org> References: <1458319661-19762-1-git-send-email-ard.biesheuvel@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Unlike on 32-bit ARM, where we need to pass the stub's version of struct screen_info to the kernel proper via a configuration table, on 64-bit ARM it simply involves making the core kernel's copy of struct screen_info visible to the stub by exposing an __efistub_ alias for it. Signed-off-by: Ard Biesheuvel --- arch/arm64/include/asm/efi.h | 3 +++ arch/arm64/kernel/efi.c | 3 +++ arch/arm64/kernel/image.h | 1 + 3 files changed, 7 insertions(+) diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h index bb26f2205973..ed6c85d3a583 100644 --- a/arch/arm64/include/asm/efi.h +++ b/arch/arm64/include/asm/efi.h @@ -54,6 +54,9 @@ int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); #define __efi_call_early(f, ...) f(__VA_ARGS__) #define efi_is_64bit() (true) +#define alloc_screen_info(x...) &screen_info +#define free_screen_info(x...) + #define EFI_ALLOC_ALIGN SZ_64K /* diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index b6abc852f2a1..6f4b3ea359db 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -17,6 +17,9 @@ #include +/* we will fill this structure from the stub, so don't put it in .bss */ +struct screen_info screen_info __section(.data); + int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md) { pteval_t prot_val; diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h index 5e360ce88f10..1428849aece8 100644 --- a/arch/arm64/kernel/image.h +++ b/arch/arm64/kernel/image.h @@ -112,6 +112,7 @@ __efistub___memset = KALLSYMS_HIDE(__pi_memset); __efistub__text = KALLSYMS_HIDE(_text); __efistub__end = KALLSYMS_HIDE(_end); __efistub__edata = KALLSYMS_HIDE(_edata); +__efistub_screen_info = KALLSYMS_HIDE(screen_info); #endif -- 2.5.0 From mboxrd@z Thu Jan 1 00:00:00 1970 From: ard.biesheuvel@linaro.org (Ard Biesheuvel) Date: Fri, 18 Mar 2016 17:47:37 +0100 Subject: [PATCH v2 5/9] efi/arm64: libstub: make screen_info accessible to the UEFI stub In-Reply-To: <1458319661-19762-1-git-send-email-ard.biesheuvel@linaro.org> References: <1458319661-19762-1-git-send-email-ard.biesheuvel@linaro.org> Message-ID: <1458319661-19762-6-git-send-email-ard.biesheuvel@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Unlike on 32-bit ARM, where we need to pass the stub's version of struct screen_info to the kernel proper via a configuration table, on 64-bit ARM it simply involves making the core kernel's copy of struct screen_info visible to the stub by exposing an __efistub_ alias for it. Signed-off-by: Ard Biesheuvel --- arch/arm64/include/asm/efi.h | 3 +++ arch/arm64/kernel/efi.c | 3 +++ arch/arm64/kernel/image.h | 1 + 3 files changed, 7 insertions(+) diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h index bb26f2205973..ed6c85d3a583 100644 --- a/arch/arm64/include/asm/efi.h +++ b/arch/arm64/include/asm/efi.h @@ -54,6 +54,9 @@ int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); #define __efi_call_early(f, ...) f(__VA_ARGS__) #define efi_is_64bit() (true) +#define alloc_screen_info(x...) &screen_info +#define free_screen_info(x...) + #define EFI_ALLOC_ALIGN SZ_64K /* diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index b6abc852f2a1..6f4b3ea359db 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -17,6 +17,9 @@ #include +/* we will fill this structure from the stub, so don't put it in .bss */ +struct screen_info screen_info __section(.data); + int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md) { pteval_t prot_val; diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h index 5e360ce88f10..1428849aece8 100644 --- a/arch/arm64/kernel/image.h +++ b/arch/arm64/kernel/image.h @@ -112,6 +112,7 @@ __efistub___memset = KALLSYMS_HIDE(__pi_memset); __efistub__text = KALLSYMS_HIDE(_text); __efistub__end = KALLSYMS_HIDE(_end); __efistub__edata = KALLSYMS_HIDE(_edata); +__efistub_screen_info = KALLSYMS_HIDE(screen_info); #endif -- 2.5.0