diff options
Diffstat (limited to 'arch/arc/kernel/setup.c')
| -rw-r--r-- | arch/arc/kernel/setup.c | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index 643eae4436e0..119dddb752b2 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -29,7 +29,10 @@ int running_on_hw = 1; /* vs. on ISS */ -char __initdata command_line[COMMAND_LINE_SIZE]; +/* Part of U-boot ABI: see head.S */ +int __initdata uboot_tag; +char __initdata *uboot_arg; + const struct machine_desc *machine_desc; struct task_struct *_current_task[NR_CPUS]; /* For stack switching */ @@ -311,19 +314,40 @@ void setup_processor(void) arc_chk_fpu(); } +static inline int is_kernel(unsigned long addr) +{ + if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) + return 1; + return 0; +} + void __init setup_arch(char **cmdline_p) { - /* This also populates @boot_command_line from /bootargs */ - machine_desc = setup_machine_fdt(__dtb_start); - if (!machine_desc) - panic("Embedded DT invalid\n"); - - /* Append any u-boot provided cmdline */ -#ifdef CONFIG_CMDLINE_UBOOT - /* Add a whitespace seperator between the 2 cmdlines */ - strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); - strlcat(boot_command_line, command_line, COMMAND_LINE_SIZE); -#endif + /* make sure that uboot passed pointer to cmdline/dtb is valid */ + if (uboot_tag && is_kernel((unsigned long)uboot_arg)) + panic("Invalid uboot arg\n"); + + /* See if u-boot passed an external Device Tree blob */ + machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */ + if (!machine_desc) { + /* No, so try the embedded one */ + machine_desc = setup_machine_fdt(__dtb_start); + if (!machine_desc) + panic("Embedded DT invalid\n"); + + /* + * If we are here, it is established that @uboot_arg didn't + * point to DT blob. Instead if u-boot says it is cmdline, + * Appent to embedded DT cmdline. + * setup_machine_fdt() would have populated @boot_command_line + */ + if (uboot_tag == 1) { + /* Ensure a whitespace between the 2 cmdlines */ + strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); + strlcat(boot_command_line, uboot_arg, + COMMAND_LINE_SIZE); + } + } /* Save unparsed command line copy for /proc/cmdline */ *cmdline_p = boot_command_line; |