diff options
Diffstat (limited to 'arch/mips/kernel/setup.c')
-rw-r--r-- | arch/mips/kernel/setup.c | 137 |
1 files changed, 93 insertions, 44 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index 5eec13b8d222..c3d4212b5f1d 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -67,7 +67,9 @@ static char __initdata command_line[COMMAND_LINE_SIZE]; char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; #ifdef CONFIG_CMDLINE_BOOL -static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; +static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE; +#else +static const char builtin_cmdline[] __initconst = ""; #endif /* @@ -285,7 +287,7 @@ static unsigned long __init init_initrd(void) * Initialize the bootmem allocator. It also setup initrd related data * if needed. */ -#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) +#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) static void __init bootmem_init(void) { @@ -538,11 +540,94 @@ static void __init check_kernel_sections_mem(void) } } -#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER) -#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) -#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) -#define BUILTIN_EXTEND_WITH_PROM \ - IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND) +static void __init bootcmdline_append(const char *s, size_t max) +{ + if (!s[0] || !max) + return; + + if (boot_command_line[0]) + strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); + + strlcat(boot_command_line, s, max); +} + +#ifdef CONFIG_OF_EARLY_FLATTREE + +static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname, + int depth, void *data) +{ + bool *dt_bootargs = data; + const char *p; + int l; + + if (depth != 1 || !data || + (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) + return 0; + + p = of_get_flat_dt_prop(node, "bootargs", &l); + if (p != NULL && l > 0) { + bootcmdline_append(p, min(l, COMMAND_LINE_SIZE)); + *dt_bootargs = true; + } + + return 1; +} + +#endif /* CONFIG_OF_EARLY_FLATTREE */ + +static void __init bootcmdline_init(char **cmdline_p) +{ + bool dt_bootargs = false; + + /* + * If CMDLINE_OVERRIDE is enabled then initializing the command line is + * trivial - we simply use the built-in command line unconditionally & + * unmodified. + */ + if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { + strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); + return; + } + + /* + * If the user specified a built-in command line & + * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is + * prepended to arguments from the bootloader or DT so we'll copy them + * to the start of boot_command_line here. Otherwise, empty + * boot_command_line to undo anything early_init_dt_scan_chosen() did. + */ + if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) + strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); + else + boot_command_line[0] = 0; + +#ifdef CONFIG_OF_EARLY_FLATTREE + /* + * If we're configured to take boot arguments from DT, look for those + * now. + */ + if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)) + of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs); +#endif + + /* + * If we didn't get any arguments from DT (regardless of whether that's + * because we weren't configured to look for them, or because we looked + * & found none) then we'll take arguments from the bootloader. + * plat_mem_setup() should have filled arcs_cmdline with arguments from + * the bootloader. + */ + if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs) + bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE); + + /* + * If the user specified a built-in command line & we didn't already + * prepend it, we append it to boot_command_line here. + */ + if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && + !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) + bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE); +} /* * arch_mem_init - initialize memory management subsystem @@ -570,48 +655,12 @@ static void __init arch_mem_init(char **cmdline_p) { extern void plat_mem_setup(void); - /* - * Initialize boot_command_line to an innocuous but non-empty string in - * order to prevent early_init_dt_scan_chosen() from copying - * CONFIG_CMDLINE into it without our knowledge. We handle - * CONFIG_CMDLINE ourselves below & don't want to duplicate its - * content because repeating arguments can be problematic. - */ - strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE); - /* call board setup routine */ plat_mem_setup(); memblock_set_bottom_up(true); -#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) - strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); -#else - if ((USE_PROM_CMDLINE && arcs_cmdline[0]) || - (USE_DTB_CMDLINE && !boot_command_line[0])) - strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); - - if (EXTEND_WITH_PROM && arcs_cmdline[0]) { - if (boot_command_line[0]) - strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); - strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); - } - -#if defined(CONFIG_CMDLINE_BOOL) - if (builtin_cmdline[0]) { - if (boot_command_line[0]) - strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); - strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); - } - - if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) { - if (boot_command_line[0]) - strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); - strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); - } -#endif -#endif + bootcmdline_init(cmdline_p); strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); - *cmdline_p = command_line; parse_early_param(); |