From: "Pali Rohár" <pali.rohar@gmail.com> To: Rob Herring <robherring2@gmail.com> Cc: Russell King <linux@arm.linux.org.uk>, Will Deacon <will.deacon@arm.com>, Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>, Sebastian Reichel <sre@debian.org>, Pavel Machek <pavel@ucw.cz>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Tony Lindgren <tony@atomide.com> Subject: [PATCH] ARM: /proc/atags: Export also for DT Date: Mon, 26 Jan 2015 20:16:52 +0100 [thread overview] Message-ID: <201501262016.52079@pali> (raw) In-Reply-To: <CAL_JsqJ9i0jwaL1cyeomQG=bhhcnEgdGWYOqkcwidyk5xOUukg@mail.gmail.com> [-- Attachment #1: Type: Text/Plain, Size: 2145 bytes --] This patch will cause that decompressor store full ATAG structure into DT tree ("/atags"): diff --git a/arch/arm/boot/compressed/atags_to_fdt.c b/arch/arm/boot/compressed/atags_to_fdt.c index e7e1cc9..1975d7c 100644 --- a/arch/arm/boot/compressed/atags_to_fdt.c +++ b/arch/arm/boot/compressed/atags_to_fdt.c @@ -112,7 +112,7 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) * address and size for each bank */ uint32_t mem_reg_property[2 * 2 * NR_BANKS]; int memcount = 0; - int ret, memsize; + int ret, memsize, atag_size; /* make sure we've got an aligned pointer */ if ((u32)atag_list & 0x3) @@ -184,6 +184,10 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) } } + /* include the terminating ATAG_NONE */ + atag_size = (char *)atag - (char *)atag_list + sizeof(struct tag_header); + setprop(fdt, "/", "atags", atag_list, atag_size); + if (memcount) { setprop(fdt, "/memory", "reg", mem_reg_property, 4 * memcount * memsize); And this patch will export ATAG structure from DT tree ("/atags") into /proc/atags file: diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c index 9946c1b..0f249a3 100644 --- a/arch/arm/kernel/devtree.c +++ b/arch/arm/kernel/devtree.c @@ -29,6 +29,7 @@ #include <asm/mach-types.h> #include <asm/system_info.h> +#include "atags.h" #ifdef CONFIG_SMP extern struct of_cpu_method __cpu_method_of_table[]; @@ -254,5 +255,10 @@ const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys) if (prop) system_rev = fdt32_to_cpu(*prop); + /* Save atags */ + prop = of_get_flat_dt_prop(dt_root, "atags", NULL); + if (prop) + save_atags((void *)prop); + return mdesc; } Some userspace applications needs access to ATAG structure where can be stored some information passed from bootloader to kernel. Example is Nokia N900 device and NOLO bootloader which provides information about bootreason (device was started by power button or by alarm or restarted...) and bootmode (normal mode or device update mode). -- Pali Rohár pali.rohar@gmail.com [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 198 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: pali.rohar@gmail.com (Pali Rohár) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] ARM: /proc/atags: Export also for DT Date: Mon, 26 Jan 2015 20:16:52 +0100 [thread overview] Message-ID: <201501262016.52079@pali> (raw) In-Reply-To: <CAL_JsqJ9i0jwaL1cyeomQG=bhhcnEgdGWYOqkcwidyk5xOUukg@mail.gmail.com> This patch will cause that decompressor store full ATAG structure into DT tree ("/atags"): diff --git a/arch/arm/boot/compressed/atags_to_fdt.c b/arch/arm/boot/compressed/atags_to_fdt.c index e7e1cc9..1975d7c 100644 --- a/arch/arm/boot/compressed/atags_to_fdt.c +++ b/arch/arm/boot/compressed/atags_to_fdt.c @@ -112,7 +112,7 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) * address and size for each bank */ uint32_t mem_reg_property[2 * 2 * NR_BANKS]; int memcount = 0; - int ret, memsize; + int ret, memsize, atag_size; /* make sure we've got an aligned pointer */ if ((u32)atag_list & 0x3) @@ -184,6 +184,10 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) } } + /* include the terminating ATAG_NONE */ + atag_size = (char *)atag - (char *)atag_list + sizeof(struct tag_header); + setprop(fdt, "/", "atags", atag_list, atag_size); + if (memcount) { setprop(fdt, "/memory", "reg", mem_reg_property, 4 * memcount * memsize); And this patch will export ATAG structure from DT tree ("/atags") into /proc/atags file: diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c index 9946c1b..0f249a3 100644 --- a/arch/arm/kernel/devtree.c +++ b/arch/arm/kernel/devtree.c @@ -29,6 +29,7 @@ #include <asm/mach-types.h> #include <asm/system_info.h> +#include "atags.h" #ifdef CONFIG_SMP extern struct of_cpu_method __cpu_method_of_table[]; @@ -254,5 +255,10 @@ const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys) if (prop) system_rev = fdt32_to_cpu(*prop); + /* Save atags */ + prop = of_get_flat_dt_prop(dt_root, "atags", NULL); + if (prop) + save_atags((void *)prop); + return mdesc; } Some userspace applications needs access to ATAG structure where can be stored some information passed from bootloader to kernel. Example is Nokia N900 device and NOLO bootloader which provides information about bootreason (device was started by power button or by alarm or restarted...) and bootmode (normal mode or device update mode). -- Pali Roh?r pali.rohar at gmail.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part. URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20150126/f941725a/attachment.sig>
next prev parent reply other threads:[~2015-01-26 19:16 UTC|newest] Thread overview: 197+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-06-18 16:54 [PATCH] ARM: /proc/cpuinfo: Use DT machine name when possible Pali Rohár 2014-06-18 16:54 ` Pali Rohár 2014-06-18 19:01 ` Russell King - ARM Linux 2014-06-18 19:01 ` Russell King - ARM Linux 2014-06-18 19:09 ` Pali Rohár 2014-06-18 19:09 ` Pali Rohár 2014-06-18 19:59 ` Russell King - ARM Linux 2014-06-18 19:59 ` Russell King - ARM Linux 2014-06-19 8:21 ` Pavel Machek 2014-06-19 8:21 ` Pavel Machek 2014-07-11 19:31 ` Pavel Machek 2014-07-11 19:31 ` Pavel Machek 2014-06-18 19:07 ` Rob Herring 2014-06-18 19:07 ` Rob Herring 2014-06-18 19:22 ` Pali Rohár 2014-06-18 19:22 ` Pali Rohár 2014-06-18 20:00 ` Russell King - ARM Linux 2014-06-18 20:00 ` Russell King - ARM Linux 2014-06-18 20:20 ` Pali Rohár 2014-06-18 20:20 ` Pali Rohár 2014-06-18 21:53 ` Fabio Estevam 2014-06-18 21:53 ` Fabio Estevam 2014-11-24 22:16 ` Pali Rohár 2014-11-24 22:16 ` Pali Rohár 2014-06-18 20:46 ` Rob Herring 2014-06-18 20:46 ` Rob Herring 2014-06-18 21:47 ` Russell King - ARM Linux 2014-06-18 21:47 ` Russell King - ARM Linux 2014-06-18 22:27 ` Rob Herring 2014-06-18 22:27 ` Rob Herring 2014-06-18 23:07 ` Russell King - ARM Linux 2014-06-18 23:07 ` Russell King - ARM Linux 2014-11-24 22:19 ` Pali Rohár 2014-11-24 22:19 ` Pali Rohár 2014-12-04 0:33 ` Rob Herring 2014-12-04 0:33 ` Rob Herring 2014-12-04 0:48 ` Pali Rohár 2014-12-04 0:48 ` Pali Rohár 2014-12-04 16:49 ` Rob Herring 2014-12-04 16:49 ` Rob Herring 2014-12-04 17:57 ` Pali Rohár 2014-12-04 17:57 ` Pali Rohár 2014-12-04 18:10 ` Rob Herring 2014-12-04 18:10 ` Rob Herring 2015-01-26 19:09 ` [PATCH] ARM: /proc/cpuinfo: DT: Add support for Revision Pali Rohár 2015-01-26 19:09 ` Pali Rohár 2015-01-26 20:22 ` Rob Herring 2015-01-26 20:22 ` Rob Herring 2015-01-30 14:14 ` Pali Rohár 2015-01-30 14:14 ` Pali Rohár 2015-01-30 21:03 ` Rob Herring 2015-01-30 21:03 ` Rob Herring 2015-02-27 15:45 ` Pali Rohár 2015-02-27 15:45 ` Pali Rohár 2015-02-27 15:55 ` [PATCH v2 0/2] " Pali Rohár 2015-02-27 15:55 ` Pali Rohár 2015-02-27 15:55 ` [PATCH v2 1/2] arm: devtree: Set system_rev from DT revision Pali Rohár 2015-02-27 15:55 ` Pali Rohár 2015-02-27 15:55 ` [PATCH v2 2/2] arm: boot: convert ATAG_REVISION to DT revision field Pali Rohár 2015-02-27 15:55 ` Pali Rohár 2015-03-02 11:28 ` [PATCH v2 0/2] ARM: /proc/cpuinfo: DT: Add support for Revision Pavel Machek 2015-03-02 11:28 ` Pavel Machek 2015-03-16 15:44 ` Tony Lindgren 2015-03-16 15:44 ` Tony Lindgren 2015-03-16 16:14 ` Russell King - ARM Linux 2015-03-16 16:14 ` Russell King - ARM Linux 2015-03-16 16:43 ` Nicolas Pitre 2015-03-16 16:43 ` Nicolas Pitre 2015-03-16 19:21 ` Russell King - ARM Linux 2015-03-16 19:21 ` Russell King - ARM Linux 2015-03-16 18:10 ` Tony Lindgren 2015-03-16 18:10 ` Tony Lindgren 2015-03-16 19:59 ` Russell King - ARM Linux 2015-03-16 19:59 ` Russell King - ARM Linux 2015-03-16 20:54 ` Pali Rohár 2015-03-16 20:54 ` Pali Rohár 2015-03-16 20:59 ` Tony Lindgren 2015-03-16 20:59 ` Tony Lindgren 2015-01-26 22:34 ` [PATCH] " Andreas Färber 2015-01-26 22:34 ` Andreas Färber 2015-02-27 15:56 ` Pali Rohár 2015-02-27 15:56 ` Pali Rohár 2015-01-26 19:16 ` Pali Rohár [this message] 2015-01-26 19:16 ` [PATCH] ARM: /proc/atags: Export also for DT Pali Rohár 2015-01-26 20:33 ` Rob Herring 2015-01-26 20:33 ` Rob Herring 2015-01-27 13:21 ` Pavel Machek 2015-01-27 13:21 ` Pavel Machek 2015-01-27 14:16 ` Rob Herring 2015-01-27 14:16 ` Rob Herring 2015-01-27 14:24 ` Pavel Machek 2015-01-27 14:24 ` Pavel Machek 2015-01-27 14:32 ` Pali Rohár 2015-01-27 14:32 ` Pali Rohár 2015-01-27 17:48 ` Russell King - ARM Linux 2015-01-27 17:48 ` Russell King - ARM Linux 2015-01-27 20:03 ` Nicolas Pitre 2015-01-27 20:03 ` Nicolas Pitre 2015-01-27 21:09 ` Russell King - ARM Linux 2015-01-27 21:09 ` Russell King - ARM Linux 2015-01-27 21:34 ` Nicolas Pitre 2015-01-27 21:34 ` Nicolas Pitre 2015-01-27 21:58 ` Nicolas Pitre 2015-01-27 21:58 ` Nicolas Pitre 2015-01-27 22:33 ` Russell King - ARM Linux 2015-01-27 22:33 ` Russell King - ARM Linux 2015-01-28 2:07 ` Nicolas Pitre 2015-01-28 2:07 ` Nicolas Pitre 2015-01-28 6:21 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-28 6:21 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-28 7:19 ` Pavel Machek 2015-01-28 7:19 ` Pavel Machek 2015-01-28 8:06 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-28 8:06 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-28 8:25 ` Pavel Machek 2015-01-28 8:25 ` Pavel Machek 2015-01-28 7:18 ` Pavel Machek 2015-01-28 7:18 ` Pavel Machek 2015-01-28 13:38 ` Pali Rohár 2015-01-28 13:38 ` Pali Rohár 2015-01-27 23:10 ` Pavel Machek 2015-01-27 23:10 ` Pavel Machek 2015-01-28 0:50 ` Tony Lindgren 2015-01-28 0:50 ` Tony Lindgren 2015-01-28 13:58 ` Pali Rohár 2015-01-28 13:58 ` Pali Rohár 2015-01-28 14:33 ` Nicolas Pitre 2015-01-28 15:39 ` Tony Lindgren 2015-01-28 15:39 ` Tony Lindgren 2015-01-28 15:47 ` Pali Rohár 2015-01-28 15:47 ` Pali Rohár 2015-01-28 15:48 ` Tony Lindgren 2015-01-28 15:48 ` Tony Lindgren 2015-01-28 16:31 ` Jason Cooper 2015-01-28 16:31 ` Jason Cooper 2015-01-28 15:57 ` Rob Herring 2015-01-28 15:57 ` Rob Herring 2015-01-28 16:13 ` Russell King - ARM Linux 2015-01-28 16:13 ` Russell King - ARM Linux 2015-01-28 16:19 ` Will Deacon 2015-01-28 16:19 ` Will Deacon 2015-01-28 17:01 ` Russell King - ARM Linux 2015-01-28 17:01 ` Russell King - ARM Linux 2015-01-28 17:29 ` Russell King - ARM Linux 2015-01-28 17:29 ` Russell King - ARM Linux 2015-01-28 17:18 ` Pali Rohár 2015-01-28 17:18 ` Pali Rohár 2015-01-28 18:00 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-28 18:00 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-28 19:33 ` Pali Rohár 2015-01-28 19:33 ` Pali Rohár 2015-01-28 18:03 ` Pavel Machek 2015-01-28 18:03 ` Pavel Machek 2015-01-28 19:27 ` Arnd Bergmann 2015-01-28 19:27 ` Arnd Bergmann 2015-01-28 14:46 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-28 14:46 ` Jean-Christophe PLAGNIOL-VILLARD 2015-01-27 19:40 ` Nicolas Pitre 2015-01-27 19:40 ` Nicolas Pitre 2015-01-26 20:37 ` Russell King - ARM Linux 2015-01-26 20:37 ` Russell King - ARM Linux 2015-01-26 20:44 ` Pali Rohár 2015-01-26 20:44 ` Pali Rohár 2014-12-04 19:00 ` [PATCH] ARM: /proc/cpuinfo: Use DT machine name when possible Pali Rohár 2014-12-04 19:00 ` Pali Rohár 2014-12-04 10:59 ` Russell King - ARM Linux 2014-12-04 10:59 ` Russell King - ARM Linux 2014-06-18 21:10 ` Aaro Koskinen 2014-06-18 21:10 ` Aaro Koskinen 2014-07-11 19:28 ` Pavel Machek 2014-07-11 19:28 ` Pavel Machek 2014-11-24 22:21 ` Pali Rohár 2014-11-24 22:21 ` Pali Rohár 2014-09-05 11:38 ` Pali Rohár 2014-09-05 11:38 ` Pali Rohár 2014-09-05 12:13 ` Russell King - ARM Linux 2014-09-05 12:13 ` Russell King - ARM Linux 2014-09-10 12:46 ` Pavel Machek 2014-09-10 12:46 ` Pavel Machek 2014-11-24 22:23 ` Pali Rohár 2014-11-24 22:23 ` Pali Rohár 2014-09-05 13:45 ` Mark Rutland 2014-09-05 13:45 ` Mark Rutland 2014-09-05 13:52 ` Pali Rohár 2014-09-05 13:52 ` Pali Rohár 2014-09-05 13:58 ` Mark Rutland 2014-09-05 13:58 ` Mark Rutland 2014-11-24 22:25 ` Pali Rohár 2014-11-24 22:25 ` Pali Rohár 2014-09-05 13:58 ` Fabio Estevam 2014-09-05 13:58 ` Fabio Estevam 2014-11-24 22:27 ` Pali Rohár 2014-11-24 22:27 ` Pali Rohár 2014-09-06 15:34 ` Andreas Färber 2014-09-06 15:34 ` Andreas Färber 2014-11-24 22:29 ` Pali Rohár 2014-11-24 22:29 ` Pali Rohár
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