diff options
Diffstat (limited to 'nixos/modules/kernel-patches/0005-generic-Mangle-bootloader-s-kernel-arguments.patch')
| -rw-r--r-- | nixos/modules/kernel-patches/0005-generic-Mangle-bootloader-s-kernel-arguments.patch | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/nixos/modules/kernel-patches/0005-generic-Mangle-bootloader-s-kernel-arguments.patch b/nixos/modules/kernel-patches/0005-generic-Mangle-bootloader-s-kernel-arguments.patch new file mode 100644 index 0000000..4eafb31 --- /dev/null +++ b/nixos/modules/kernel-patches/0005-generic-Mangle-bootloader-s-kernel-arguments.patch @@ -0,0 +1,217 @@ +From 7f478ddf690dfccd8aea406a9697e1448920bf0f Mon Sep 17 00:00:00 2001 +From: Adrian Panella <ianchi74@outlook.com> +Date: Thu, 9 Mar 2017 09:37:17 +0100 +Subject: [PATCH 05/10] generic: Mangle bootloader's kernel arguments + +The command-line arguments provided by the boot loader will be +appended to a new device tree property: bootloader-args. +If there is a property "append-rootblock" in DT under /chosen +and a root= option in bootloaders command line it will be parsed +and added to DT bootargs with the form: <append-rootblock>XX. +Only command line ATAG will be processed, the rest of the ATAGs +sent by bootloader will be ignored. +This is usefull in dual boot systems, to get the current root partition +without afecting the rest of the system. + +Signed-off-by: Adrian Panella <ianchi74@outlook.com> + +This patch has been modified to be mvebu specific. The original patch +did not pass the bootloader cmdline on if no append-rootblock stanza +was found, resulting in blank cmdline and failure to boot. + +Signed-off-by: Michael Gray <michael.gray@lantisproject.com> +--- + arch/arm/Kconfig | 11 ++++ + arch/arm/boot/compressed/atags_to_fdt.c | 85 ++++++++++++++++++++++++- + init/main.c | 16 +++++ + 3 files changed, 111 insertions(+), 1 deletion(-) + +diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig +index 7630ba9cb6cc..dae040cc2a4f 100644 +--- a/arch/arm/Kconfig ++++ b/arch/arm/Kconfig +@@ -1638,6 +1638,17 @@ config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND + The command-line arguments provided by the boot loader will be + appended to the the device tree bootargs property. + ++config ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE ++ bool "Append rootblock parsing bootloader's kernel arguments" ++ help ++ The command-line arguments provided by the boot loader will be ++ appended to a new device tree property: bootloader-args. ++ If there is a property "append-rootblock" in DT under /chosen ++ and a root= option in bootloaders command line it will be parsed ++ and added to DT bootargs with the form: <append-rootblock>XX. ++ Only command line ATAG will be processed, the rest of the ATAGs ++ sent by bootloader will be ignored. ++ + endchoice + + config CMDLINE +diff --git a/arch/arm/boot/compressed/atags_to_fdt.c b/arch/arm/boot/compressed/atags_to_fdt.c +index 1feb6b0f7a1f..fb8cd4f07e60 100644 +--- a/arch/arm/boot/compressed/atags_to_fdt.c ++++ b/arch/arm/boot/compressed/atags_to_fdt.c +@@ -5,6 +5,8 @@ + + #if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND) + #define do_extend_cmdline 1 ++#elif defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++#define do_extend_cmdline 1 + #else + #define do_extend_cmdline 0 + #endif +@@ -69,6 +71,72 @@ static uint32_t get_cell_size(const void *fdt) + return cell_size; + } + ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++ ++static char *append_rootblock(char *dest, const char *str, int len, void *fdt) ++{ ++ char *ptr, *end; ++ char *root="root="; ++ int i, l; ++ const char *rootblock; ++ ++ //ARM doesn't have __HAVE_ARCH_STRSTR, so search manually ++ ptr = str - 1; ++ ++ do { ++ //first find an 'r' at the begining or after a space ++ do { ++ ptr++; ++ ptr = strchr(ptr, 'r'); ++ if (!ptr) ++ goto no_append; ++ ++ } while (ptr != str && *(ptr-1) != ' '); ++ ++ //then check for the rest ++ for(i = 1; i <= 4; i++) ++ if(*(ptr+i) != *(root+i)) break; ++ ++ } while (i != 5); ++ ++ end = strchr(ptr, ' '); ++ end = end ? (end - 1) : (strchr(ptr, 0) - 1); ++ ++ //find partition number (assumes format root=/dev/mtdXX | /dev/mtdblockXX | yy:XX ) ++ for( i = 0; end >= ptr && *end >= '0' && *end <= '9'; end--, i++); ++ ptr = end + 1; ++ ++ /* if append-rootblock property is set use it to append to command line */ ++ rootblock = getprop(fdt, "/chosen", "append-rootblock", &l); ++ if (rootblock == NULL) ++ goto no_append; ++ ++ if (*dest != ' ') { ++ *dest = ' '; ++ dest++; ++ len++; ++ } ++ ++ if (len + l + i <= COMMAND_LINE_SIZE) { ++ memcpy(dest, rootblock, l); ++ dest += l - 1; ++ memcpy(dest, ptr, i); ++ dest += i; ++ } ++ ++ return dest; ++ ++no_append: ++ len = strlen(str); ++ if (len + 1 < COMMAND_LINE_SIZE) { ++ memcpy(dest, str, len); ++ dest += len; ++ } ++ ++ return dest; ++} ++#endif ++ + static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline) + { + char cmdline[COMMAND_LINE_SIZE]; +@@ -88,12 +156,21 @@ static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline) + + /* and append the ATAG_CMDLINE */ + if (fdt_cmdline) { ++ ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++ //save original bootloader args ++ //and append ubi.mtd with root partition number to current cmdline ++ setprop_string(fdt, "/chosen", "bootloader-args", fdt_cmdline); ++ ptr = append_rootblock(ptr, fdt_cmdline, len, fdt); ++ ++#else + len = strlen(fdt_cmdline); + if (ptr - cmdline + len + 2 < COMMAND_LINE_SIZE) { + *ptr++ = ' '; + memcpy(ptr, fdt_cmdline, len); + ptr += len; + } ++#endif + } + *ptr = '\0'; + +@@ -168,7 +245,9 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) + else + setprop_string(fdt, "/chosen", "bootargs", + atag->u.cmdline.cmdline); +- } else if (atag->hdr.tag == ATAG_MEM) { ++ } ++#ifndef CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE ++ else if (atag->hdr.tag == ATAG_MEM) { + if (memcount >= sizeof(mem_reg_property)/4) + continue; + if (!atag->u.mem.size) +@@ -212,6 +291,10 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) + setprop(fdt, "/memory", "reg", mem_reg_property, + 4 * memcount * memsize); + } ++#else ++ ++ } ++#endif + + return fdt_pack(fdt); + } +diff --git a/init/main.c b/init/main.c +index 1fe7942f5d4a..fa08c129d3e1 100644 +--- a/init/main.c ++++ b/init/main.c +@@ -113,6 +113,10 @@ + + #include <kunit/test.h> + ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++#include <linux/of.h> ++#endif ++ + static int kernel_init(void *); + + extern void init_IRQ(void); +@@ -961,6 +965,18 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void) + page_alloc_init(); + + pr_notice("Kernel command line: %s\n", saved_command_line); ++ ++#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE) ++ //Show bootloader's original command line for reference ++ if(of_chosen) { ++ const char *prop = of_get_property(of_chosen, "bootloader-args", NULL); ++ if(prop) ++ pr_notice("Bootloader command line (ignored): %s\n", prop); ++ else ++ pr_notice("Bootloader command line not present\n"); ++ } ++#endif ++ + /* parameters may set static keys */ + jump_label_init(); + parse_early_param(); +-- +2.37.2 + |