Merge branch 'parisc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:

 - Make the powerpc implementation to read elf files available as a
   public kexec interface so it can be re-used on other architectures
   (Sven)

 - Implement kexec on parisc (Sven)

 - Add kprobes on ftrace on parisc (Sven)

 - Fix kernel crash with HSC-PCI cards based on card-mode Dino

 - Add assembly implementations for memset, strlen, strcpy, strncpy and
   strcat

 - Some cleanups, documentation updates, warning fixes, ...

* 'parisc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (25 commits)
  parisc: Have git ignore generated real2.S and firmware.c
  parisc: Disable HP HSC-PCI Cards to prevent kernel crash
  parisc: add support for kexec_file_load() syscall
  parisc: wire up kexec_file_load syscall
  parisc: add kexec syscall support
  parisc: add __pdc_cpu_rendezvous()
  kprobes/parisc: remove arch_kprobe_on_func_entry()
  kexec_elf: support 32 bit ELF files
  kexec_elf: remove unused variable in kexec_elf_load()
  kexec_elf: remove Elf_Rel macro
  kexec_elf: remove PURGATORY_STACK_SIZE
  kexec_elf: remove parsing of section headers
  kexec_elf: change order of elf_*_to_cpu() functions
  kexec: add KEXEC_ELF
  parisc: Save some bytes in dino driver
  parisc: Drop comments which are already in pci.h
  parisc: Convert eisa_enumerator to use pr_cont()
  parisc: Avoid warning when loading hppb driver
  parisc: speed up flush_tlb_all_local with qemu
  parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMU
  ...

6 files changed, 65 insertions, 1 deletions

diff --git a/arch/parisc/include/asm/alternative.h b/arch/parisc/include/asm/alternative.h
index 793d8baa3a10..0ec54f43d6d2 100644
--- a/arch/parisc/include/asm/alternative.h
+++ b/arch/parisc/include/asm/alternative.h
@@ -8,6 +8,7 @@
 #define ALT_COND_NO_ICACHE	0x04	/* if system has no i-cache  */
 #define ALT_COND_NO_SPLIT_TLB	0x08	/* if split_tlb == 0  */
 #define ALT_COND_NO_IOC_FDC	0x10	/* if I/O cache does not need flushes */
+#define ALT_COND_RUN_ON_QEMU	0x20	/* if running on QEMU */
 
 #define INSN_PxTLB	0x02		/* modify pdtlb, pitlb */
 #define INSN_NOP	0x08000240	/* nop */
@@ -21,7 +22,7 @@
 
 struct alt_instr {
 	s32 orig_offset;	/* offset to original instructions */
-	u32 len;		/* end of original instructions */
+	s32 len;		/* end of original instructions */
 	u32 cond;		/* see ALT_COND_XXX */
 	u32 replacement;	/* replacement instruction or code */
 };
@@ -40,12 +41,20 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
 
 #else
 
+/* to replace one single instructions by a new instruction */
 #define ALTERNATIVE(from, to, cond, replacement)\
 	.section .altinstructions, "aw"	!	\
 	.word (from - .), (to - from)/4	!	\
 	.word cond, replacement		!	\
 	.previous
 
+/* to replace multiple instructions by new code */
+#define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\
+	.section .altinstructions, "aw"	!	\
+	.word (from - .), -num_instructions !	\
+	.word cond, (new_instr_ptr - .)	!	\
+	.previous
+
 #endif  /*  __ASSEMBLY__  */
 
 #endif /* __ASM_PARISC_ALTERNATIVE_H */
diff --git a/arch/parisc/include/asm/fixmap.h b/arch/parisc/include/asm/fixmap.h
index 288da73d4cc0..e480b2c05407 100644
--- a/arch/parisc/include/asm/fixmap.h
+++ b/arch/parisc/include/asm/fixmap.h
@@ -30,6 +30,7 @@
 enum fixed_addresses {
 	/* Support writing RO kernel text via kprobes, jump labels, etc. */
 	FIX_TEXT_POKE0,
+	FIX_TEXT_KEXEC,
 	FIX_BITMAP_COUNT
 };
 
diff --git a/arch/parisc/include/asm/ftrace.h b/arch/parisc/include/asm/ftrace.h
index 958c0aa5dbb2..a7cf0d05ccf4 100644
--- a/arch/parisc/include/asm/ftrace.h
+++ b/arch/parisc/include/asm/ftrace.h
@@ -8,6 +8,7 @@ extern void mcount(void);
 #define MCOUNT_ADDR		((unsigned long)mcount)
 #define MCOUNT_INSN_SIZE	4
 #define CC_USING_NOP_MCOUNT
+#define ARCH_SUPPORTS_FTRACE_OPS 1
 extern unsigned long sys_call_table[];
 
 extern unsigned long return_address(unsigned int);
diff --git a/arch/parisc/include/asm/kexec.h b/arch/parisc/include/asm/kexec.h
new file mode 100644
index 000000000000..a99ea747d7ed
--- /dev/null
+++ b/arch/parisc/include/asm/kexec.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_PARISC_KEXEC_H
+#define _ASM_PARISC_KEXEC_H
+
+#ifdef CONFIG_KEXEC
+
+/* Maximum physical address we can use pages from */
+#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
+/* Maximum address we can reach in physical address mode */
+#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
+/* Maximum address we can use for the control code buffer */
+#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
+
+#define KEXEC_CONTROL_PAGE_SIZE	4096
+
+#define KEXEC_ARCH KEXEC_ARCH_PARISC
+#define ARCH_HAS_KIMAGE_ARCH
+
+#ifndef __ASSEMBLY__
+
+struct kimage_arch {
+	unsigned long initrd_start;
+	unsigned long initrd_end;
+	unsigned long cmdline;
+};
+
+static inline void crash_setup_regs(struct pt_regs *newregs,
+				    struct pt_regs *oldregs)
+{
+	/* Dummy implementation for now */
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* CONFIG_KEXEC */
+
+#endif /* _ASM_PARISC_KEXEC_H */
diff --git a/arch/parisc/include/asm/pdc.h b/arch/parisc/include/asm/pdc.h
index 19bb2e46cd36..b388d8176588 100644
--- a/arch/parisc/include/asm/pdc.h
+++ b/arch/parisc/include/asm/pdc.h
@@ -91,6 +91,7 @@ int pdc_sti_call(unsigned long func, unsigned long flags,
                  unsigned long inptr, unsigned long outputr,
                  unsigned long glob_cfg);
 
+int __pdc_cpu_rendezvous(void);
 static inline char * os_id_to_string(u16 os_id) {
 	switch(os_id) {
 	case OS_ID_NONE:	return "No OS";
diff --git a/arch/parisc/include/asm/string.h b/arch/parisc/include/asm/string.h
index f6e1132f4e35..4a0c9dbd62fd 100644
--- a/arch/parisc/include/asm/string.h
+++ b/arch/parisc/include/asm/string.h
@@ -8,4 +8,19 @@ extern void * memset(void *, int, size_t);
 #define __HAVE_ARCH_MEMCPY
 void * memcpy(void * dest,const void *src,size_t count);
 
+#define __HAVE_ARCH_STRLEN
+extern size_t strlen(const char *s);
+
+#define __HAVE_ARCH_STRCPY
+extern char *strcpy(char *dest, const char *src);
+
+#define __HAVE_ARCH_STRNCPY
+extern char *strncpy(char *dest, const char *src, size_t count);
+
+#define __HAVE_ARCH_STRCAT
+extern char *strcat(char *dest, const char *src);
+
+#define __HAVE_ARCH_MEMSET
+extern void *memset(void *, int, size_t);
+
 #endif