4 files changed, 111 insertions, 9 deletions

diff --git a/include/asm-powerpc/elf.h b/include/asm-powerpc/elf.h
index d22b10021b5d..d140577d0a05 100644
--- a/include/asm-powerpc/elf.h
+++ b/include/asm-powerpc/elf.h
@@ -178,18 +178,22 @@ typedef elf_vrreg_t elf_vrregset_t32[ELF_NVRREG32];
 static inline void ppc_elf_core_copy_regs(elf_gregset_t elf_regs,
                                             struct pt_regs *regs)
 {
-        int i;
-        int gprs = sizeof(struct pt_regs)/sizeof(ELF_GREG_TYPE);
+        int i, nregs;
 
-        if (gprs > ELF_NGREG)
-                gprs = ELF_NGREG;
+        memset((void *)elf_regs, 0, sizeof(elf_gregset_t));
 
-        for (i=0; i < gprs; i++)
-                elf_regs[i] = (elf_greg_t)((ELF_GREG_TYPE *)regs)[i];
-
-        memset((char *)(elf_regs) + sizeof(struct pt_regs), 0,          \
-               sizeof(elf_gregset_t) - sizeof(struct pt_regs));
+        /* Our registers are always unsigned longs, whether we're a 32 bit
+         * process or 64 bit, on either a 64 bit or 32 bit kernel.
+         * Don't use ELF_GREG_TYPE here. */
+        nregs = sizeof(struct pt_regs) / sizeof(unsigned long);
+        if (nregs > ELF_NGREG)
+                nregs = ELF_NGREG;
 
+        for (i = 0; i < nregs; i++) {
+                /* This will correctly truncate 64 bit registers to 32 bits
+                 * for a 32 bit process on a 64 bit kernel. */
+                elf_regs[i] = (elf_greg_t)((ELF_GREG_TYPE *)regs)[i];
+        }
 }
 #define ELF_CORE_COPY_REGS(gregs, regs) ppc_elf_core_copy_regs(gregs, regs);
 
diff --git a/include/asm-powerpc/kexec.h b/include/asm-powerpc/kexec.h
new file mode 100644
index 000000000000..062ab9ba68eb
--- /dev/null
+++ b/include/asm-powerpc/kexec.h
@@ -0,0 +1,49 @@
+#ifndef _ASM_POWERPC_KEXEC_H
+#define _ASM_POWERPC_KEXEC_H
+
+/*
+ * Maximum page that is mapped directly into kernel memory.
+ * XXX: Since we copy virt we can use any page we allocate
+ */
+#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
+
+/*
+ * Maximum address we can reach in physical address mode.
+ * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
+ */
+#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
+
+/* Maximum address we can use for the control code buffer */
+#ifdef __powerpc64__
+#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
+#else
+/* TASK_SIZE, probably left over from use_mm ?? */
+#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
+#endif
+
+#define KEXEC_CONTROL_CODE_SIZE 4096
+
+/* The native architecture */
+#ifdef __powerpc64__
+#define KEXEC_ARCH KEXEC_ARCH_PPC64
+#else
+#define KEXEC_ARCH KEXEC_ARCH_PPC
+#endif
+
+#ifndef __ASSEMBLY__
+
+#define MAX_NOTE_BYTES 1024
+typedef u32 note_buf_t[MAX_NOTE_BYTES / sizeof(u32)];
+
+extern note_buf_t crash_notes[];
+
+#ifdef __powerpc64__
+extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
+                                          master to copy new code to 0 */
+#else
+struct kimage;
+extern void machine_kexec_simple(struct kimage *image);
+#endif
+
+#endif /* ! __ASSEMBLY__ */
+#endif /* _ASM_POWERPC_KEXEC_H */
diff --git a/include/asm-powerpc/machdep.h b/include/asm-powerpc/machdep.h
index 451b345cfc78..629ca964b974 100644
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -80,6 +80,7 @@ struct machdep_calls {
         void            (*iommu_dev_setup)(struct pci_dev *dev);
         void            (*iommu_bus_setup)(struct pci_bus *bus);
         void            (*irq_bus_setup)(struct pci_bus *bus);
+        int             (*set_dabr)(unsigned long dabr);
 #endif
 
         int             (*probe)(int platform);
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index 5b2ecbc47907..b5da0b851e02 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -359,5 +359,53 @@ extern void reloc_got2(unsigned long);
 
 #define PTRRELOC(x)     ((typeof(x)) add_reloc_offset((unsigned long)(x)))
 
+static inline void create_instruction(unsigned long addr, unsigned int instr)
+{
+        unsigned int *p;
+        p  = (unsigned int *)addr;
+        *p = instr;
+        asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p));
+}
+
+/* Flags for create_branch:
+ * "b"   == create_branch(addr, target, 0);
+ * "ba"  == create_branch(addr, target, BRANCH_ABSOLUTE);
+ * "bl"  == create_branch(addr, target, BRANCH_SET_LINK);
+ * "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK);
+ */
+#define BRANCH_SET_LINK 0x1
+#define BRANCH_ABSOLUTE 0x2
+
+static inline void create_branch(unsigned long addr,
+                unsigned long target, int flags)
+{
+        unsigned int instruction;
+
+        if (! (flags & BRANCH_ABSOLUTE))
+                target = target - addr;
+
+        /* Mask out the flags and target, so they don't step on each other. */
+        instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC);
+
+        create_instruction(addr, instruction);
+}
+
+static inline void create_function_call(unsigned long addr, void * func)
+{
+        unsigned long func_addr;
+
+#ifdef CONFIG_PPC64
+        /*
+         * On PPC64 the function pointer actually points to the function's
+         * descriptor. The first entry in the descriptor is the address
+         * of the function text.
+         */
+        func_addr = *(unsigned long *)func;
+#else
+        func_addr = (unsigned long)func;
+#endif
+        create_branch(addr, func_addr, BRANCH_SET_LINK);
+}
+
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_SYSTEM_H */