1 files changed, 58 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index bcdc209dca85..e381f2fc121c 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -192,6 +192,11 @@ static unsigned long __initdata alloc_bottom;
 static unsigned long __initdata rmo_top;
 static unsigned long __initdata ram_top;
 
+#ifdef CONFIG_KEXEC
+static unsigned long __initdata prom_crashk_base;
+static unsigned long __initdata prom_crashk_size;
+#endif
+
 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
 static int __initdata mem_reserve_cnt;
 
@@ -553,7 +558,8 @@ unsigned long prom_memparse(const char *ptr, const char **retptr)
 static void __init early_cmdline_parse(void)
 {
         struct prom_t *_prom = &RELOC(prom);
-        char *opt, *p;
+        const char *opt;
+        char *p;
         int l = 0;
 
         RELOC(prom_cmd_line[0]) = 0;
@@ -590,6 +596,34 @@ static void __init early_cmdline_parse(void)
                 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
 #endif
         }
+
+#ifdef CONFIG_KEXEC
+        /*
+         * crashkernel=size@addr specifies the location to reserve for
+         * crash kernel.
+         */
+        opt = strstr(RELOC(prom_cmd_line), RELOC("crashkernel="));
+        if (opt) {
+                opt += 12;
+                RELOC(prom_crashk_size) = prom_memparse(opt, &opt);
+
+                if (ALIGN(RELOC(prom_crashk_size), 0x1000000) !=
+                        RELOC(prom_crashk_size)) {
+                        prom_printf("Warning: crashkernel size is not "
+                                        "aligned to 16MB\n");
+                }
+
+                /*
+                 * At present, the crash kernel always run at 32MB.
+                 * Just ignore whatever user passed.
+                 */
+                RELOC(prom_crashk_base) = 0x2000000;
+                if (*opt == '@') {
+                        prom_printf("Warning: PPC64 kdump kernel always runs "
+                                        "at 32 MB\n");
+                }
+        }
+#endif
 }
 
 #ifdef CONFIG_PPC_PSERIES
@@ -1011,6 +1045,12 @@ static void __init prom_init_mem(void)
         prom_printf("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
         prom_printf("  rmo_top      : %x\n", RELOC(rmo_top));
         prom_printf("  ram_top      : %x\n", RELOC(ram_top));
+#ifdef CONFIG_KEXEC
+        if (RELOC(prom_crashk_base)) {
+                prom_printf("  crashk_base  : %x\n",  RELOC(prom_crashk_base));
+                prom_printf("  crashk_size  : %x\n", RELOC(prom_crashk_size));
+        }
+#endif
 }
 
 
@@ -1500,6 +1540,8 @@ static int __init prom_find_machine_type(void)
 #ifdef CONFIG_PPC64
                         if (strstr(p, RELOC("Momentum,Maple")))
                                 return PLATFORM_MAPLE;
+                        if (strstr(p, RELOC("IBM,CPB")))
+                                return PLATFORM_CELL;
 #endif
                         i += sl + 1;
                 }
@@ -1994,7 +2036,7 @@ static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
         if (r3 && r4 && r4 != 0xdeadbeef) {
                 unsigned long val;
 
-                RELOC(prom_initrd_start) = (r3 >= KERNELBASE) ? __pa(r3) : r3;
+                RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
                 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
 
                 val = RELOC(prom_initrd_start);
@@ -2094,6 +2136,10 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
          */
         prom_init_mem();
 
+#ifdef CONFIG_KEXEC
+        if (RELOC(prom_crashk_base))
+                reserve_mem(RELOC(prom_crashk_base), RELOC(prom_crashk_size));
+#endif
         /*
          * Determine which cpu is actually running right _now_
          */
@@ -2150,6 +2196,16 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
         }
 #endif
 
+#ifdef CONFIG_KEXEC
+        if (RELOC(prom_crashk_base)) {
+                prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-base",
+                        PTRRELOC(&prom_crashk_base),
+                        sizeof(RELOC(prom_crashk_base)));
+                prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-size",
+                        PTRRELOC(&prom_crashk_size),
+                        sizeof(RELOC(prom_crashk_size)));
+        }
+#endif
         /*
          * Fixup any known bugs in the device-tree
          */