diff options
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 27 | ||||
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 3 | ||||
| -rw-r--r-- | include/asm-powerpc/prom.h | 2 |
3 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 535a33e4aa37..2b062853bcc7 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -1922,3 +1922,30 @@ int prom_update_property(struct device_node *np, return 0; } + +#ifdef CONFIG_KEXEC +/* We may have allocated the flat device tree inside the crash kernel region + * in prom_init. If so we need to move it out into regular memory. */ +void kdump_move_device_tree(void) +{ + unsigned long start, end; + struct boot_param_header *new; + + start = __pa((unsigned long)initial_boot_params); + end = start + initial_boot_params->totalsize; + + if (end < crashk_res.start || start > crashk_res.end) + return; + + new = (struct boot_param_header*) + __va(lmb_alloc(initial_boot_params->totalsize, PAGE_SIZE)); + + memcpy(new, initial_boot_params, initial_boot_params->totalsize); + + initial_boot_params = new; + + DBG("Flat device tree blob moved to %p\n", initial_boot_params); + + /* XXX should we unreserve the old DT? */ +} +#endif /* CONFIG_KEXEC */ diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index e29b275e09e0..a717dff695ef 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -398,6 +398,9 @@ void __init setup_system(void) { DBG(" -> setup_system()\n"); +#ifdef CONFIG_KEXEC + kdump_move_device_tree(); +#endif /* * Unflatten the device-tree passed by prom_init or kexec */ diff --git a/include/asm-powerpc/prom.h b/include/asm-powerpc/prom.h index 5b2bd4eefb01..cbd297f44cce 100644 --- a/include/asm-powerpc/prom.h +++ b/include/asm-powerpc/prom.h @@ -222,5 +222,7 @@ extern int of_address_to_resource(struct device_node *dev, int index, extern int of_pci_address_to_resource(struct device_node *dev, int bar, struct resource *r); +extern void kdump_move_device_tree(void); + #endif /* __KERNEL__ */ #endif /* _POWERPC_PROM_H */ |