[POWERPC] Add starting of secondary 86xx CPUs.

[karo-tx-linux.git] / arch / powerpc / kernel / machine_kexec_64.c

diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index d6431440c54fe881415c5d1a8ec15ebefd4c6104..a8fa04ef27cd79597a65842f8e9b380d8eb3d828 100644 (file)
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -21,13 +21,12 @@
 #include <asm/machdep.h>
 #include <asm/cacheflush.h>
 #include <asm/paca.h>
+#include <asm/lmb.h>
 #include <asm/mmu.h>
 #include <asm/sections.h>      /* _end */
 #include <asm/prom.h>
 #include <asm/smp.h>
 
-#define HASH_GROUP_SIZE 0x80   /* size of each hash group, asm/mmu.h */
-
 int default_machine_kexec_prepare(struct kimage *image)
 {
        int i;
@@ -61,7 +60,7 @@ int default_machine_kexec_prepare(struct kimage *image)
         */
        if (htab_address) {
                low = __pa(htab_address);
-               high = low + (htab_hash_mask + 1) * HASH_GROUP_SIZE;
+               high = low + htab_size_bytes;
 
                for (i = 0; i < image->nr_segments; i++) {
                        begin = image->segment[i].mem;
@@ -294,7 +293,7 @@ void default_machine_kexec(struct kimage *image)
 }
 
 /* Values we need to export to the second kernel via the device tree. */
-static unsigned long htab_base, htab_size, kernel_end;
+static unsigned long htab_base, kernel_end;
 
 static struct property htab_base_prop = {
        .name = "linux,htab-base",
@@ -305,7 +304,7 @@ static struct property htab_base_prop = {
 static struct property htab_size_prop = {
        .name = "linux,htab-size",
        .length = sizeof(unsigned long),
-       .value = (unsigned char *)&htab_size,
+       .value = (unsigned char *)&htab_size_bytes,
 };
 
 static struct property kernel_end_prop = {
@@ -331,15 +330,111 @@ static void __init export_htab_values(void)
 
        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);
 }
 
+static struct property crashk_base_prop = {
+       .name = "linux,crashkernel-base",
+       .length = sizeof(unsigned long),
+       .value = (unsigned char *)&crashk_res.start,
+};
+
+static unsigned long crashk_size;
+
+static struct property crashk_size_prop = {
+       .name = "linux,crashkernel-size",
+       .length = sizeof(unsigned long),
+       .value = (unsigned char *)&crashk_size,
+};
+
+static void __init export_crashk_values(void)
+{
+       struct device_node *node;
+       struct property *prop;
+
+       node = of_find_node_by_path("/chosen");
+       if (!node)
+               return;
+
+       /* There might be existing crash kernel properties, but we can't
+        * be sure what's in them, so remove them. */
+       prop = of_find_property(node, "linux,crashkernel-base", NULL);
+       if (prop)
+               prom_remove_property(node, prop);
+
+       prop = of_find_property(node, "linux,crashkernel-size", NULL);
+       if (prop)
+               prom_remove_property(node, prop);
+
+       if (crashk_res.start != 0) {
+               prom_add_property(node, &crashk_base_prop);
+               crashk_size = crashk_res.end - crashk_res.start + 1;
+               prom_add_property(node, &crashk_size_prop);
+       }
+
+       of_node_put(node);
+}
+
 void __init kexec_setup(void)
 {
        export_htab_values();
+       export_crashk_values();
+}
+
+static int __init early_parse_crashk(char *p)
+{
+       unsigned long size;
+
+       if (!p)
+               return 1;
+
+       size = memparse(p, &p);
+
+       if (*p == '@')
+               crashk_res.start = memparse(p + 1, &p);
+       else
+               crashk_res.start = KDUMP_KERNELBASE;
+
+       crashk_res.end = crashk_res.start + size - 1;
+
+       return 0;
+}
+early_param("crashkernel", early_parse_crashk);
+
+void __init reserve_crashkernel(void)
+{
+       unsigned long size;
+
+       if (crashk_res.start == 0)
+               return;
+
+       /* We might have got these values via the command line or the
+        * device tree, either way sanitise them now. */
+
+       size = crashk_res.end - crashk_res.start + 1;
+
+       if (crashk_res.start != KDUMP_KERNELBASE)
+               printk("Crash kernel location must be 0x%x\n",
+                               KDUMP_KERNELBASE);
+
+       crashk_res.start = KDUMP_KERNELBASE;
+       size = PAGE_ALIGN(size);
+       crashk_res.end = crashk_res.start + size - 1;
+
+       /* Crash kernel trumps memory limit */
+       if (memory_limit && memory_limit <= crashk_res.end) {
+               memory_limit = crashk_res.end + 1;
+               printk("Adjusted memory limit for crashkernel, now 0x%lx\n",
+                               memory_limit);
+       }
+
+       lmb_reserve(crashk_res.start, size);
+}
+
+int overlaps_crashkernel(unsigned long start, unsigned long size)
+{
+       return (start + size) > crashk_res.start && start <= crashk_res.end;
 }