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authorMichael Ellerman <michael@ellerman.id.au>2005-11-12 00:06:06 +1100
committerPaul Mackerras <paulus@samba.org>2005-11-14 16:34:06 +1100
commit593e537b93193d1696809817533ce5ad510445b1 (patch)
treeb2045132486c3d39950899e3a9b574188df55ce6 /arch/ppc64/kernel
parentc5e24354efae9f962e0e369d875d45f47e0bb9aa (diff)
[PATCH] powerpc: Export htab start/end via device tree
The userspace kexec-tools need to know the location of the htab on non-lpar machines, as well as the end of the kernel. Export via the device tree. NB. This patch has been updated to use "linux,x" property names. You may need to update your kexec-tools to match. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc64/kernel')
-rw-r--r--arch/ppc64/kernel/machine_kexec.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/machine_kexec.c b/arch/ppc64/kernel/machine_kexec.c
index 203f1d5e6f1..97c51e452be 100644
--- a/arch/ppc64/kernel/machine_kexec.c
+++ b/arch/ppc64/kernel/machine_kexec.c
@@ -305,3 +305,54 @@ void machine_kexec(struct kimage *image)
ppc_md.hpte_clear_all);
/* NOTREACHED */
}
+
+/* Values we need to export to the second kernel via the device tree. */
+static unsigned long htab_base, htab_size, kernel_end;
+
+static struct property htab_base_prop = {
+ .name = "linux,htab-base",
+ .length = sizeof(unsigned long),
+ .value = (unsigned char *)&htab_base,
+};
+
+static struct property htab_size_prop = {
+ .name = "linux,htab-size",
+ .length = sizeof(unsigned long),
+ .value = (unsigned char *)&htab_size,
+};
+
+static struct property kernel_end_prop = {
+ .name = "linux,kernel-end",
+ .length = sizeof(unsigned long),
+ .value = (unsigned char *)&kernel_end,
+};
+
+static void __init export_htab_values(void)
+{
+ struct device_node *node;
+
+ node = of_find_node_by_path("/chosen");
+ if (!node)
+ return;
+
+ kernel_end = __pa(_end);
+ prom_add_property(node, &kernel_end_prop);
+
+ /* On machines with no htab htab_address is NULL */
+ if (NULL == htab_address)
+ goto out;
+
+ htab_base = __pa(htab_address);
+ prom_add_property(node, &htab_base_prop);
+
+ htab_size = 1UL << ppc64_pft_size;
+ prom_add_property(node, &htab_size_prop);
+
+ out:
+ of_node_put(node);
+}
+
+void __init kexec_setup(void)
+{
+ export_htab_values();
+}