diff options
Diffstat (limited to 'arch/x86_64/kernel/machine_kexec.c')
| -rw-r--r-- | arch/x86_64/kernel/machine_kexec.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/machine_kexec.c b/arch/x86_64/kernel/machine_kexec.c index 106076b370f..2e94c072d84 100644 --- a/arch/x86_64/kernel/machine_kexec.c +++ b/arch/x86_64/kernel/machine_kexec.c @@ -226,3 +226,31 @@ NORET_TYPE void machine_kexec(struct kimage *image) rnk = (relocate_new_kernel_t) control_code_buffer; (*rnk)(page_list, control_code_buffer, image->start, start_pgtable); } + +/* crashkernel=size@addr specifies the location to reserve for + * a crash kernel. By reserving this memory we guarantee + * that linux never set's it up as a DMA target. + * Useful for holding code to do something appropriate + * after a kernel panic. + */ +static int __init setup_crashkernel(char *arg) +{ + unsigned long size, base; + char *p; + if (!arg) + return -EINVAL; + size = memparse(arg, &p); + if (arg == p) + return -EINVAL; + if (*p == '@') { + base = memparse(p+1, &p); + /* FIXME: Do I want a sanity check to validate the + * memory range? Yes you do, but it's too early for + * e820 -AK */ + crashk_res.start = base; + crashk_res.end = base + size - 1; + } + return 0; +} +early_param("crashkernel", setup_crashkernel); + |