diff options
| -rw-r--r-- | arch/mips/kernel/relocate.c | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/arch/mips/kernel/relocate.c b/arch/mips/kernel/relocate.c index c82288569eb1..9103bebc9a8e 100644 --- a/arch/mips/kernel/relocate.c +++ b/arch/mips/kernel/relocate.c @@ -31,6 +31,8 @@ extern u32 _relocation_end[]; /* End relocation table */ extern long __start___ex_table; /* Start exception table */ extern long __stop___ex_table; /* End exception table */ +extern void __weak plat_fdt_relocated(void *new_location); + /* * This function may be defined for a platform to perform any post-relocation * fixup necessary. @@ -41,7 +43,6 @@ int __weak plat_post_relocation(long offset) return 0; } - static inline u32 __init get_synci_step(void) { u32 res; @@ -302,12 +303,14 @@ void *__init relocate_kernel(void) int res = 1; /* Default to original kernel entry point */ void *kernel_entry = start_kernel; + void *fdt = NULL; /* Get the command line */ fw_init_cmdline(); #if defined(CONFIG_USE_OF) /* Deal with the device tree */ - early_init_dt_scan(plat_get_fdt()); + fdt = plat_get_fdt(); + early_init_dt_scan(fdt); if (boot_command_line[0]) { /* Boot command line was passed in device tree */ strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE); @@ -327,6 +330,29 @@ void *__init relocate_kernel(void) arcs_cmdline[0] = '\0'; if (offset) { + void (*fdt_relocated_)(void *) = NULL; +#if defined(CONFIG_USE_OF) + unsigned long fdt_phys = virt_to_phys(fdt); + + /* + * If built-in dtb is used then it will have been relocated + * during kernel _text relocation. If appended DTB is used + * then it will not be relocated, but it should remain + * intact in the original location. If dtb is loaded by + * the bootloader then it may need to be moved if it crosses + * the target memory area + */ + + if (fdt_phys >= virt_to_phys(RELOCATED(&_text)) && + fdt_phys <= virt_to_phys(RELOCATED(&_end))) { + void *fdt_relocated = + RELOCATED(ALIGN((long)&_end, PAGE_SIZE)); + memcpy(fdt_relocated, fdt, fdt_totalsize(fdt)); + fdt = fdt_relocated; + fdt_relocated_ = RELOCATED(&plat_fdt_relocated); + } +#endif /* CONFIG_USE_OF */ + /* Copy the kernel to it's new location */ memcpy(loc_new, &_text, kernel_length); @@ -350,6 +376,14 @@ void *__init relocate_kernel(void) memcpy(RELOCATED(&__bss_start), &__bss_start, bss_length); /* + * If fdt was stored outside of the kernel image and + * had to be moved then update platform's state data + * with the new fdt location + */ + if (fdt_relocated_) + fdt_relocated_(fdt); + + /* * Last chance for the platform to abort relocation. * This may also be used by the platform to perform any * initialisation required now that the new kernel is |