diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-09-17 23:19:02 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-09-17 23:19:02 +0100 |
commit | dc81df520bfb918a5cd4adc2ddcc7f1701fd1455 (patch) | |
tree | 920931f9512cb37d58d80a6ddcc697f3a9bbfdb5 /arch/arm | |
parent | 9bc1503185a09930782012fda5601694caeec77a (diff) | |
parent | bd51e2f595580fb64bd8494badef746c4d626b25 (diff) | |
download | op-kernel-dev-dc81df520bfb918a5cd4adc2ddcc7f1701fd1455.zip op-kernel-dev-dc81df520bfb918a5cd4adc2ddcc7f1701fd1455.tar.gz |
Merge branch 'atags' into integrator
Diffstat (limited to 'arch/arm')
-rw-r--r-- | arch/arm/Kconfig | 26 | ||||
-rw-r--r-- | arch/arm/kernel/Makefile | 5 | ||||
-rw-r--r-- | arch/arm/kernel/atags.h | 14 | ||||
-rw-r--r-- | arch/arm/kernel/atags_compat.c (renamed from arch/arm/kernel/compat.c) | 4 | ||||
-rw-r--r-- | arch/arm/kernel/atags_parse.c | 238 | ||||
-rw-r--r-- | arch/arm/kernel/atags_proc.c (renamed from arch/arm/kernel/atags.c) | 0 | ||||
-rw-r--r-- | arch/arm/kernel/compat.h | 11 | ||||
-rw-r--r-- | arch/arm/kernel/setup.c | 236 |
8 files changed, 277 insertions, 257 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 2f88d8d..c3fa860 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1891,12 +1891,6 @@ config CC_STACKPROTECTOR neutralized via a kernel panic. This feature requires gcc version 4.2 or above. -config DEPRECATED_PARAM_STRUCT - bool "Provide old way to pass kernel parameters" - help - This was deprecated in 2001 and announced to live on for 5 years. - Some old boot loaders still use this way. - endmenu menu "Boot options" @@ -1909,6 +1903,23 @@ config USE_OF help Include support for flattened device tree machine descriptions. +config ATAGS + bool "Support for the traditional ATAGS boot data passing" if USE_OF + default y + help + This is the traditional way of passing data to the kernel at boot + time. If you are solely relying on the flattened device tree (or + the ARM_ATAG_DTB_COMPAT option) then you may unselect this option + to remove ATAGS support from your kernel binary. If unsure, + leave this to y. + +config DEPRECATED_PARAM_STRUCT + bool "Provide old way to pass kernel parameters" + depends on ATAGS + help + This was deprecated in 2001 and announced to live on for 5 years. + Some old boot loaders still use this way. + # Compressed boot loader in ROM. Yes, we really want to ask about # TEXT and BSS so we preserve their values in the config files. config ZBOOT_ROM_TEXT @@ -2035,6 +2046,7 @@ config CMDLINE choice prompt "Kernel command line type" if CMDLINE != "" default CMDLINE_FROM_BOOTLOADER + depends on ATAGS config CMDLINE_FROM_BOOTLOADER bool "Use bootloader kernel arguments if available" @@ -2104,7 +2116,7 @@ config KEXEC config ATAGS_PROC bool "Export atags in procfs" - depends on KEXEC + depends on ATAGS && KEXEC default y help Should the atags used to boot the kernel be exported in an "atags" diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 7ad2d5c..79e346a 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -19,7 +19,9 @@ obj-y := elf.o entry-armv.o entry-common.o irq.o opcodes.o \ process.o ptrace.o return_address.o sched_clock.o \ setup.o signal.o stacktrace.o sys_arm.o time.o traps.o -obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += compat.o +obj-$(CONFIG_ATAGS) += atags_parse.o +obj-$(CONFIG_ATAGS_PROC) += atags_proc.o +obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += atags_compat.o obj-$(CONFIG_LEDS) += leds.o obj-$(CONFIG_OC_ETM) += etm.o @@ -52,7 +54,6 @@ test-kprobes-objs += kprobes-test-thumb.o else test-kprobes-objs += kprobes-test-arm.o endif -obj-$(CONFIG_ATAGS_PROC) += atags.o obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o obj-$(CONFIG_ARM_THUMBEE) += thumbee.o obj-$(CONFIG_KGDB) += kgdb.o diff --git a/arch/arm/kernel/atags.h b/arch/arm/kernel/atags.h index e5f028d..9edc969 100644 --- a/arch/arm/kernel/atags.h +++ b/arch/arm/kernel/atags.h @@ -3,3 +3,17 @@ extern void save_atags(struct tag *tags); #else static inline void save_atags(struct tag *tags) { } #endif + +void convert_to_tag_list(struct tag *tags); + +#ifdef CONFIG_ATAGS +struct machine_desc *setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr); +#else +static inline struct machine_desc * +setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr) +{ + early_print("no ATAGS support: can't continue\n"); + while (true); + unreachable(); +} +#endif diff --git a/arch/arm/kernel/compat.c b/arch/arm/kernel/atags_compat.c index 9256523..5236ad3 100644 --- a/arch/arm/kernel/compat.c +++ b/arch/arm/kernel/atags_compat.c @@ -1,5 +1,5 @@ /* - * linux/arch/arm/kernel/compat.c + * linux/arch/arm/kernel/atags_compat.c * * Copyright (C) 2001 Russell King * @@ -26,7 +26,7 @@ #include <asm/mach/arch.h> -#include "compat.h" +#include "atags.h" /* * Usage: diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c new file mode 100644 index 0000000..14512e6 --- /dev/null +++ b/arch/arm/kernel/atags_parse.c @@ -0,0 +1,238 @@ +/* + * Tag parsing. + * + * Copyright (C) 1995-2001 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * This is the traditional way of passing data to the kernel at boot time. Rather + * than passing a fixed inflexible structure to the kernel, we pass a list + * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE + * tag for the list to be recognised (to distinguish the tagged list from + * a param_struct). The list is terminated with a zero-length tag (this tag + * is not parsed in any way). + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/root_dev.h> +#include <linux/screen_info.h> + +#include <asm/setup.h> +#include <asm/system_info.h> +#include <asm/page.h> +#include <asm/mach/arch.h> + +#include "atags.h" + +static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; + +#ifndef MEM_SIZE +#define MEM_SIZE (16*1024*1024) +#endif + +static struct { + struct tag_header hdr1; + struct tag_core core; + struct tag_header hdr2; + struct tag_mem32 mem; + struct tag_header hdr3; +} default_tags __initdata = { + { tag_size(tag_core), ATAG_CORE }, + { 1, PAGE_SIZE, 0xff }, + { tag_size(tag_mem32), ATAG_MEM }, + { MEM_SIZE }, + { 0, ATAG_NONE } +}; + +static int __init parse_tag_core(const struct tag *tag) +{ + if (tag->hdr.size > 2) { + if ((tag->u.core.flags & 1) == 0) + root_mountflags &= ~MS_RDONLY; + ROOT_DEV = old_decode_dev(tag->u.core.rootdev); + } + return 0; +} + +__tagtable(ATAG_CORE, parse_tag_core); + +static int __init parse_tag_mem32(const struct tag *tag) +{ + return arm_add_memory(tag->u.mem.start, tag->u.mem.size); +} + +__tagtable(ATAG_MEM, parse_tag_mem32); + +#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) +static int __init parse_tag_videotext(const struct tag *tag) +{ + screen_info.orig_x = tag->u.videotext.x; + screen_info.orig_y = tag->u.videotext.y; + screen_info.orig_video_page = tag->u.videotext.video_page; + screen_info.orig_video_mode = tag->u.videotext.video_mode; + screen_info.orig_video_cols = tag->u.videotext.video_cols; + screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx; + screen_info.orig_video_lines = tag->u.videotext.video_lines; + screen_info.orig_video_isVGA = tag->u.videotext.video_isvga; + screen_info.orig_video_points = tag->u.videotext.video_points; + return 0; +} + +__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext); +#endif + +#ifdef CONFIG_BLK_DEV_RAM +static int __init parse_tag_ramdisk(const struct tag *tag) +{ + extern int rd_size, rd_image_start, rd_prompt, rd_doload; + + rd_image_start = tag->u.ramdisk.start; + rd_doload = (tag->u.ramdisk.flags & 1) == 0; + rd_prompt = (tag->u.ramdisk.flags & 2) == 0; + + if (tag->u.ramdisk.size) + rd_size = tag->u.ramdisk.size; + + return 0; +} + +__tagtable(ATAG_RAMDISK, parse_tag_ramdisk); +#endif + +static int __init parse_tag_serialnr(const struct tag *tag) +{ + system_serial_low = tag->u.serialnr.low; + system_serial_high = tag->u.serialnr.high; + return 0; +} + +__tagtable(ATAG_SERIAL, parse_tag_serialnr); + +static int __init parse_tag_revision(const struct tag *tag) +{ + system_rev = tag->u.revision.rev; + return 0; +} + +__tagtable(ATAG_REVISION, parse_tag_revision); + +static int __init parse_tag_cmdline(const struct tag *tag) +{ +#if defined(CONFIG_CMDLINE_EXTEND) + strlcat(default_command_line, " ", COMMAND_LINE_SIZE); + strlcat(default_command_line, tag->u.cmdline.cmdline, + COMMAND_LINE_SIZE); +#elif defined(CONFIG_CMDLINE_FORCE) + pr_warning("Ignoring tag cmdline (using the default kernel command line)\n"); +#else + strlcpy(default_command_line, tag->u.cmdline.cmdline, + COMMAND_LINE_SIZE); +#endif + return 0; +} + +__tagtable(ATAG_CMDLINE, parse_tag_cmdline); + +/* + * Scan the tag table for this tag, and call its parse function. + * The tag table is built by the linker from all the __tagtable + * declarations. + */ +static int __init parse_tag(const struct tag *tag) +{ + extern struct tagtable __tagtable_begin, __tagtable_end; + struct tagtable *t; + + for (t = &__tagtable_begin; t < &__tagtable_end; t++) + if (tag->hdr.tag == t->tag) { + t->parse(tag); + break; + } + + return t < &__tagtable_end; +} + +/* + * Parse all tags in the list, checking both the global and architecture + * specific tag tables. + */ +static void __init parse_tags(const struct tag *t) +{ + for (; t->hdr.size; t = tag_next(t)) + if (!parse_tag(t)) + printk(KERN_WARNING + "Ignoring unrecognised tag 0x%08x\n", + t->hdr.tag); +} + +static void __init squash_mem_tags(struct tag *tag) +{ + for (; tag->hdr.size; tag = tag_next(tag)) + if (tag->hdr.tag == ATAG_MEM) + tag->hdr.tag = ATAG_NONE; +} + +struct machine_desc * __init setup_machine_tags(phys_addr_t __atags_pointer, + unsigned int machine_nr) +{ + struct tag *tags = (struct tag *)&default_tags; + struct machine_desc *mdesc = NULL, *p; + char *from = default_command_line; + + default_tags.mem.start = PHYS_OFFSET; + + /* + * locate machine in the list of supported machines. + */ + for_each_machine_desc(p) + if (machine_nr == p->nr) { + printk("Machine: %s\n", p->name); + mdesc = p; + break; + } + + if (!mdesc) { + early_print("\nError: unrecognized/unsupported machine ID" + " (r1 = 0x%08x).\n\n", machine_nr); + dump_machine_table(); /* does not return */ + } + + if (__atags_pointer) + tags = phys_to_virt(__atags_pointer); + else if (mdesc->atag_offset) + tags = (void *)(PAGE_OFFSET + mdesc->atag_offset); + +#if defined(CONFIG_DEPRECATED_PARAM_STRUCT) + /* + * If we have the old style parameters, convert them to + * a tag list. + */ + if (tags->hdr.tag != ATAG_CORE) + convert_to_tag_list(tags); +#endif + if (tags->hdr.tag != ATAG_CORE) { + early_print("Warning: Neither atags nor dtb found\n"); + tags = (struct tag *)&default_tags; + } + + if (mdesc->fixup) + mdesc->fixup(tags, &from, &meminfo); + + if (tags->hdr.tag == ATAG_CORE) { + if (meminfo.nr_banks != 0) + squash_mem_tags(tags); + save_atags(tags); + parse_tags(tags); + } + + /* parse_early_param needs a boot_command_line */ + strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); + + return mdesc; +} diff --git a/arch/arm/kernel/atags.c b/arch/arm/kernel/atags_proc.c index 42a1a14..42a1a14 100644 --- a/arch/arm/kernel/atags.c +++ b/arch/arm/kernel/atags_proc.c diff --git a/arch/arm/kernel/compat.h b/arch/arm/kernel/compat.h deleted file mode 100644 index 39264ab..0000000 --- a/arch/arm/kernel/compat.h +++ /dev/null @@ -1,11 +0,0 @@ -/* - * linux/arch/arm/kernel/compat.h - * - * Copyright (C) 2001 Russell King - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. -*/ - -extern void convert_to_tag_list(struct tag *tags); diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index a81dcec..0785472 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -21,11 +21,9 @@ #include <linux/init.h> #include <linux/kexec.h> #include <linux/of_fdt.h> -#include <linux/root_dev.h> #include <linux/cpu.h> #include <linux/interrupt.h> #include <linux/smp.h> -#include <linux/fs.h> #include <linux/proc_fs.h> #include <linux/memblock.h> #include <linux/bug.h> @@ -56,15 +54,9 @@ #include <asm/unwind.h> #include <asm/memblock.h> -#if defined(CONFIG_DEPRECATED_PARAM_STRUCT) -#include "compat.h" -#endif #include "atags.h" #include "tcm.h" -#ifndef MEM_SIZE -#define MEM_SIZE (16*1024*1024) -#endif #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE) char fpe_type[8]; @@ -145,7 +137,6 @@ static const char *machine_name; static char __initdata cmd_line[COMMAND_LINE_SIZE]; struct machine_desc *machine_desc __initdata; -static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } }; #define ENDIANNESS ((char)endian_test.l) @@ -583,21 +574,6 @@ static int __init early_mem(char *p) } early_param("mem", early_mem); -static void __init -setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz) -{ -#ifdef CONFIG_BLK_DEV_RAM - extern int rd_size, rd_image_start, rd_prompt, rd_doload; - - rd_image_start = image_start; - rd_prompt = prompt; - rd_doload = doload; - - if (rd_sz) - rd_size = rd_sz; -#endif -} - static void __init request_standard_resources(struct machine_desc *mdesc) { struct memblock_region *region; @@ -643,35 +619,6 @@ static void __init request_standard_resources(struct machine_desc *mdesc) request_resource(&ioport_resource, &lp2); } -/* - * Tag parsing. - * - * This is the new way of passing data to the kernel at boot time. Rather - * than passing a fixed inflexible structure to the kernel, we pass a list - * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE - * tag for the list to be recognised (to distinguish the tagged list from - * a param_struct). The list is terminated with a zero-length tag (this tag - * is not parsed in any way). - */ -static int __init parse_tag_core(const struct tag *tag) -{ - if (tag->hdr.size > 2) { - if ((tag->u.core.flags & 1) == 0) - root_mountflags &= ~MS_RDONLY; - ROOT_DEV = old_decode_dev(tag->u.core.rootdev); - } - return 0; -} - -__tagtable(ATAG_CORE, parse_tag_core); - -static int __init parse_tag_mem32(const struct tag *tag) -{ - return arm_add_memory(tag->u.mem.start, tag->u.mem.size); -} - -__tagtable(ATAG_MEM, parse_tag_mem32); - #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) struct screen_info screen_info = { .orig_video_lines = 30, @@ -681,117 +628,8 @@ struct screen_info screen_info = { .orig_video_isVGA = 1, .orig_video_points = 8 }; - -static int __init parse_tag_videotext(const struct tag *tag) -{ - screen_info.orig_x = tag->u.videotext.x; - screen_info.orig_y = tag->u.videotext.y; - screen_info.orig_video_page = tag->u.videotext.video_page; - screen_info.orig_video_mode = tag->u.videotext.video_mode; - screen_info.orig_video_cols = tag->u.videotext.video_cols; - screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx; - screen_info.orig_video_lines = tag->u.videotext.video_lines; - screen_info.orig_video_isVGA = tag->u.videotext.video_isvga; - screen_info.orig_video_points = tag->u.videotext.video_points; - return 0; -} - -__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext); #endif -static int __init parse_tag_ramdisk(const struct tag *tag) -{ - setup_ramdisk((tag->u.ramdisk.flags & 1) == 0, - (tag->u.ramdisk.flags & 2) == 0, - tag->u.ramdisk.start, tag->u.ramdisk.size); - return 0; -} - -__tagtable(ATAG_RAMDISK, parse_tag_ramdisk); - -static int __init parse_tag_serialnr(const struct tag *tag) -{ - system_serial_low = tag->u.serialnr.low; - system_serial_high = tag->u.serialnr.high; - return 0; -} - -__tagtable(ATAG_SERIAL, parse_tag_serialnr); - -static int __init parse_tag_revision(const struct tag *tag) -{ - system_rev = tag->u.revision.rev; - return 0; -} - -__tagtable(ATAG_REVISION, parse_tag_revision); - -static int __init parse_tag_cmdline(const struct tag *tag) -{ -#if defined(CONFIG_CMDLINE_EXTEND) - strlcat(default_command_line, " ", COMMAND_LINE_SIZE); - strlcat(default_command_line, tag->u.cmdline.cmdline, - COMMAND_LINE_SIZE); -#elif defined(CONFIG_CMDLINE_FORCE) - pr_warning("Ignoring tag cmdline (using the default kernel command line)\n"); -#else - strlcpy(default_command_line, tag->u.cmdline.cmdline, - COMMAND_LINE_SIZE); -#endif - return 0; -} - -__tagtable(ATAG_CMDLINE, parse_tag_cmdline); - -/* - * Scan the tag table for this tag, and call its parse function. - * The tag table is built by the linker from all the __tagtable - * declarations. - */ -static int __init parse_tag(const struct tag *tag) -{ - extern struct tagtable __tagtable_begin, __tagtable_end; - struct tagtable *t; - - for (t = &__tagtable_begin; t < &__tagtable_end; t++) - if (tag->hdr.tag == t->tag) { - t->parse(tag); - break; - } - - return t < &__tagtable_end; -} - -/* - * Parse all tags in the list, checking both the global and architecture - * specific tag tables. - */ -static void __init parse_tags(const struct tag *t) -{ - for (; t->hdr.size; t = tag_next(t)) - if (!parse_tag(t)) - printk(KERN_WARNING - "Ignoring unrecognised tag 0x%08x\n", - t->hdr.tag); -} - -/* - * This holds our defaults. - */ -static struct init_tags { - struct tag_header hdr1; - struct tag_core core; - struct tag_header hdr2; - struct tag_mem32 mem; - struct tag_header hdr3; -} init_tags __initdata = { - { tag_size(tag_core), ATAG_CORE }, - { 1, PAGE_SIZE, 0xff }, - { tag_size(tag_mem32), ATAG_MEM }, - { MEM_SIZE }, - { 0, ATAG_NONE } -}; - static int __init customize_machine(void) { /* customizes platform devices, or adds new ones */ @@ -858,78 +696,6 @@ static void __init reserve_crashkernel(void) static inline void reserve_crashkernel(void) {} #endif /* CONFIG_KEXEC */ -static void __init squash_mem_tags(struct tag *tag) -{ - for (; tag->hdr.size; tag = tag_next(tag)) - if (tag->hdr.tag == ATAG_MEM) - tag->hdr.tag = ATAG_NONE; -} - -static struct machine_desc * __init setup_machine_tags(unsigned int nr) -{ - struct tag *tags = (struct tag *)&init_tags; - struct machine_desc *mdesc = NULL, *p; - char *from = default_command_line; - - init_tags.mem.start = PHYS_OFFSET; - - /* - * locate machine in the list of supported machines. - */ - for_each_machine_desc(p) - if (nr == p->nr) { - printk("Machine: %s\n", p->name); - mdesc = p; - break; - } - - if (!mdesc) { - early_print("\nError: unrecognized/unsupported machine ID" - " (r1 = 0x%08x).\n\n", nr); - dump_machine_table(); /* does not return */ - } - - if (__atags_pointer) - tags = phys_to_virt(__atags_pointer); - else if (mdesc->atag_offset) - tags = (void *)(PAGE_OFFSET + mdesc->atag_offset); - -#if defined(CONFIG_DEPRECATED_PARAM_STRUCT) - /* - * If we have the old style parameters, convert them to - * a tag list. - */ - if (tags->hdr.tag != ATAG_CORE) - convert_to_tag_list(tags); -#endif - - if (tags->hdr.tag != ATAG_CORE) { -#if defined(CONFIG_OF) - /* - * If CONFIG_OF is set, then assume this is a reasonably - * modern system that should pass boot parameters - */ - early_print("Warning: Neither atags nor dtb found\n"); -#endif - tags = (struct tag *)&init_tags; - } - - if (mdesc->fixup) - mdesc->fixup(tags, &from, &meminfo); - - if (tags->hdr.tag == ATAG_CORE) { - if (meminfo.nr_banks != 0) - squash_mem_tags(tags); - save_atags(tags); - parse_tags(tags); - } - - /* parse_early_param needs a boot_command_line */ - strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); - - return mdesc; -} - static int __init meminfo_cmp(const void *_a, const void *_b) { const struct membank *a = _a, *b = _b; @@ -944,7 +710,7 @@ void __init setup_arch(char **cmdline_p) setup_processor(); mdesc = setup_machine_fdt(__atags_pointer); if (!mdesc) - mdesc = setup_machine_tags(machine_arch_type); + mdesc = setup_machine_tags(__atags_pointer, machine_arch_type); machine_desc = mdesc; machine_name = mdesc->name; |