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authorChris Metcalf <cmetcalf@tilera.com>2013-08-09 16:04:34 -0400
committerChris Metcalf <cmetcalf@tilera.com>2013-08-30 11:56:30 -0400
commit6f0142d501b35468d910b9f36b6853dbd8dc5ad5 (patch)
tree8e1a3dd81b0c0b3107714219a0478c30e2645ed8
parentb2eca4274c1813c76291eab4859ca3e86e6fd35b (diff)
downloadlinux-6f0142d501b35468d910b9f36b6853dbd8dc5ad5.tar.bz2
tile: allow "initrd" boot argument for kexec
This enables support for "kexec --initrd" for tile. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
-rw-r--r--arch/tile/kernel/setup.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index b00e156118c3..774e819f6a5f 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -694,6 +694,25 @@ static void __init setup_bootmem_allocator(void)
reserve_bootmem(m->addr, m->size, 0);
}
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (initrd_start) {
+ /* Make sure the initrd memory region is not modified. */
+ if (reserve_bootmem(initrd_start, initrd_end - initrd_start,
+ BOOTMEM_EXCLUSIVE)) {
+ pr_crit("The initrd memory region has been polluted. Disabling it.\n");
+ initrd_start = 0;
+ initrd_end = 0;
+ } else {
+ /*
+ * Translate initrd_start & initrd_end from PA to VA for
+ * future access.
+ */
+ initrd_start += PAGE_OFFSET;
+ initrd_end += PAGE_OFFSET;
+ }
+ }
+#endif
+
#ifdef CONFIG_KEXEC
if (crashk_res.start != crashk_res.end)
reserve_bootmem(crashk_res.start, resource_size(&crashk_res), 0);
@@ -1095,6 +1114,10 @@ static void __init load_hv_initrd(void)
int fd, rc;
void *initrd;
+ /* If initrd has already been set, skip initramfs file in hvfs. */
+ if (initrd_start)
+ return;
+
fd = hv_fs_findfile((HV_VirtAddr) initramfs_file);
if (fd == HV_ENOENT) {
if (set_initramfs_file) {
@@ -1133,6 +1156,25 @@ void __init free_initrd_mem(unsigned long begin, unsigned long end)
free_bootmem(__pa(begin), end - begin);
}
+static int __init setup_initrd(char *str)
+{
+ char *endp;
+ unsigned long initrd_size;
+
+ initrd_size = str ? simple_strtoul(str, &endp, 0) : 0;
+ if (initrd_size == 0 || *endp != '@')
+ return -EINVAL;
+
+ initrd_start = simple_strtoul(endp+1, &endp, 0);
+ if (initrd_start == 0)
+ return -EINVAL;
+
+ initrd_end = initrd_start + initrd_size;
+
+ return 0;
+}
+early_param("initrd", setup_initrd);
+
#else
static inline void load_hv_initrd(void) {}
#endif /* CONFIG_BLK_DEV_INITRD */