Openrisc fixes for 4.10

-----BEGIN PGP SIGNATURE-----
 
 iQIcBAABAgAGBQJYTrCSAAoJEMOzHC1eZifkXVEP/iUfUV/uI8WlBSRTbxffta8l
 HYhCmWb/xz0uEvCArII0hiow/zbZJ6wkzaiM3R7FNnfEob2tAY9L+jPDKTqpwy7E
 SJhfj8jND5XyQ6c0vIp2aiarDlcuq+hSLlTv2/tqgfXrdrJxXjQIV4tTDfnaeAYi
 UAs+anZ6go06BZ8keZVbd7i5nSYrpNxfAjsfZ2ffJEkUuxVMLjg1lfVnMU9TQjQX
 XW0bH1kf03DgkdBOEbYWDlKXTXsxbr89tDRoWpO3UPppmT/YNutiDoroxoGVyheG
 cSlZvBj53i36/n2Mtn/+Y51c98ukcZV+aWhD+MhDWeXdsy3pQ82dvRvjQcb5HIRN
 mDWvHSDmmygvtFQ9mZ5AtNbpSDQSJQyKVqgaGIgJ6gJXIHMcTsRs4BPWK0IYHza4
 vlVytChJE6xaxRnceXKVqciGaHfpomZETTLDuYebRFCqNQZNtWip5uIy8pL5orls
 LtqgN2suF/ALIx/p3TcIgMCIud9d8VfOpK9voQoz92hMCFUggUB5tU/cyqkvsNGX
 fmPQewmleWkD4W+HDVvbJ3C+9FY/P8L9M7iSDFzvyQRSfBUCmCsl2zv6dlIWFuTB
 SylS0D+2nD4Of+FtlcRpRqclakJrjCCxMkSaPk1YaSTBipbwKw3FQ9SmFvbg0wf1
 Zw0A0whyW1gFsX+lX/yK
 =5/rC
 -----END PGP SIGNATURE-----

Merge tag 'openrisc-for-linus' of git://github.com/openrisc/linux

Pull Openrisc updates from Stafford Horne:

 - changes to MAINTAINER for openrisc

 - probably biggest actual change is the move to memblock from bootmem

 - ... plus several bug and build fixes

* tag 'openrisc-for-linus' of git://github.com/openrisc/linux:
  openrisc: prevent VGA console, fix builds
  openrisc: include l.swa in check for write data pagefault
  openrisc: Updates after openrisc.net has been lost
  openrisc: Consolidate setup to use memblock instead of bootmem
  openrisc: remove the redundant of_platform_populate
  openrisc: add NR_CPUS Kconfig default value
  openrisc: Support both old (or32) and new (or1k) toolchain
  openrisc: Add thread-local storage (TLS) support
  openrisc: restore all regs on rt_sigreturn
  openrisc: fix PTRS_PER_PGD define

MAINTAINERS

@@ -8977,9 +8977,11 @@ F:	drivers/of/resolver.c
 
 OPENRISC ARCHITECTURE
 M:	Jonas Bonn <jonas@southpole.se>
-W:	http://openrisc.net
+M:	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
+M:	Stafford Horne <shorne@gmail.com>
+L:	openrisc@lists.librecores.org
+W:	http://openrisc.io
 S:	Maintained
-T:	git git://openrisc.net/~jonas/linux
 F:	arch/openrisc/
 
 OPENVSWITCH

arch/openrisc/Kconfig

@@ -26,6 +26,7 @@ config OPENRISC
 	select HAVE_DEBUG_STACKOVERFLOW
 	select OR1K_PIC
 	select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1
+	select NO_BOOTMEM
 
 config MMU
 	def_bool y
@@ -98,6 +99,9 @@ config OPENRISC_HAVE_INST_DIV
 	  Select this if your implementation has a hardware divide instruction
 endmenu
 
+config NR_CPUS
+	int
+	default "1"
 
 source kernel/Kconfig.hz
 source kernel/Kconfig.preempt

arch/openrisc/README.openrisc

@@ -6,7 +6,7 @@ target architecture, specifically, is the 32-bit OpenRISC 1000 family (or1k).
 
 For information about OpenRISC processors and ongoing development:
 
-	website		http://openrisc.net
+	website		http://openrisc.io
 
 For more information about Linux on OpenRISC, please contact South Pole AB.
 
@@ -24,17 +24,17 @@ In order to build and run Linux for OpenRISC, you'll need at least a basic
 toolchain and, perhaps, the architectural simulator.  Steps to get these bits
 in place are outlined here.
 
-1)  The toolchain can be obtained from openrisc.net.  Instructions for building
+1)  The toolchain can be obtained from openrisc.io.  Instructions for building
 a toolchain can be found at:
 
-http://openrisc.net/toolchain-build.html
+https://github.com/openrisc/tutorials
 
 2) or1ksim (optional)
 
 or1ksim is the architectural simulator which will allow you to actually run
 your OpenRISC Linux kernel if you don't have an OpenRISC processor at hand.
 
-	git clone git://openrisc.net/jonas/or1ksim-svn
+	git clone https://github.com/openrisc/or1ksim.git
 
 	cd or1ksim
 	./configure --prefix=$OPENRISC_PREFIX

arch/openrisc/TODO.openrisc

@@ -5,9 +5,6 @@ that are due for investigation shortly, i.e. our TODO list:
 
 -- Implement the rest of the DMA API... dma_map_sg, etc.
 
--- Consolidate usage of memblock and bootmem... move everything over to
-   memblock.
-
 -- Finish the renaming cleanup... there are references to or32 in the code
    which was an older name for the architecture.  The name we've settled on is
    or1k and this change is slowly trickling through the stack.  For the time

arch/openrisc/include/asm/pgalloc.h

@@ -23,7 +23,6 @@
 #include <linux/threads.h>
 #include <linux/mm.h>
 #include <linux/memblock.h>
-#include <linux/bootmem.h>
 
 extern int mem_init_done;
 

arch/openrisc/include/asm/pgtable.h

@@ -69,7 +69,7 @@ extern void paging_init(void);
  */
 #define PTRS_PER_PTE	(1UL << (PAGE_SHIFT-2))
 
-#define PTRS_PER_PGD	(1UL << (PAGE_SHIFT-2))
+#define PTRS_PER_PGD	(1UL << (32-PGDIR_SHIFT))
 
 /* calculate how many PGD entries a user-level program can use
  * the first mappable virtual address is 0

arch/openrisc/kernel/entry.S

@@ -264,7 +264,7 @@ EXCEPTION_ENTRY(_data_page_fault_handler)
 	l.srli  r6,r6,26                   // check opcode for write access
 #endif
 
-	l.sfgeui r6,0x34		   // check opcode for write access
+	l.sfgeui r6,0x33		   // check opcode for write access
 	l.bnf   1f
 	l.sfleui r6,0x37
 	l.bnf   1f
@@ -1101,8 +1101,16 @@ ENTRY(__sys_fork)
 	 l.addi	r3,r1,0
 
 ENTRY(sys_rt_sigreturn)
-	l.j	_sys_rt_sigreturn
+	l.jal	_sys_rt_sigreturn
 	 l.addi	r3,r1,0
+	l.sfne	r30,r0
+	l.bnf	_no_syscall_trace
+	 l.nop
+	l.jal	do_syscall_trace_leave
+	 l.addi	r3,r1,0
+_no_syscall_trace:
+	l.j	_resume_userspace
+	 l.nop
 
 /* This is a catch-all syscall for atomic instructions for the OpenRISC 1000.
  * The functions takes a variable number of parameters depending on which

arch/openrisc/kernel/process.c

@@ -173,6 +173,19 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
 
 		if (usp)
 			userregs->sp = usp;
+
+		/*
+		 * For CLONE_SETTLS set "tp" (r10) to the TLS pointer passed to sys_clone.
+		 *
+		 * The kernel entry is:
+		 *	int clone (long flags, void *child_stack, int *parent_tid,
+		 *		int *child_tid, struct void *tls)
+		 *
+		 * This makes the source r7 in the kernel registers.
+		 */
+		if (clone_flags & CLONE_SETTLS)
+			userregs->gpr[10] = userregs->gpr[7];
+
 		userregs->gpr[11] = 0;	/* Result from fork() */
 
 		kregs->gpr[20] = 0;	/* Userspace thread */

arch/openrisc/kernel/setup.c

@@ -38,7 +38,6 @@
 #include <linux/of.h>
 #include <linux/memblock.h>
 #include <linux/device.h>
-#include <linux/of_platform.h>
 
 #include <asm/sections.h>
 #include <asm/segment.h>
@@ -51,18 +50,16 @@
 
 #include "vmlinux.h"
 
-static unsigned long __init setup_memory(void)
+static void __init setup_memory(void)
 {
-	unsigned long bootmap_size;
 	unsigned long ram_start_pfn;
-	unsigned long free_ram_start_pfn;
 	unsigned long ram_end_pfn;
 	phys_addr_t memory_start, memory_end;
 	struct memblock_region *region;
 
 	memory_end = memory_start = 0;
 
-	/* Find main memory where is the kernel */
+	/* Find main memory where is the kernel, we assume its the only one */
 	for_each_memblock(memory, region) {
 		memory_start = region->base;
 		memory_end = region->base + region->size;
@@ -75,10 +72,11 @@ static unsigned long __init setup_memory(void)
 	}
 
 	ram_start_pfn = PFN_UP(memory_start);
-	/* free_ram_start_pfn is first page after kernel */
-	free_ram_start_pfn = PFN_UP(__pa(_end));
 	ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
 
+	/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
+	min_low_pfn = ram_start_pfn;
+	max_low_pfn = ram_end_pfn;
 	max_pfn = ram_end_pfn;
 
 	/*
@@ -86,22 +84,13 @@ static unsigned long __init setup_memory(void)
 	 *
 	 * This makes the memory from the end of the kernel to the end of
 	 * RAM usable.
-	 * init_bootmem sets the global values min_low_pfn, max_low_pfn.
 	 */
-	bootmap_size = init_bootmem(free_ram_start_pfn,
+	memblock_reserve(__pa(_stext), _end - _stext);
-				    ram_end_pfn - ram_start_pfn);
-	free_bootmem(PFN_PHYS(free_ram_start_pfn),
-		     (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
-	reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
-			BOOTMEM_DEFAULT);
 
-	for_each_memblock(reserved, region) {
+	early_init_fdt_reserve_self();
-		printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n",
+	early_init_fdt_scan_reserved_mem();
-		       (u32) region->base, (u32) region->size);
-		reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
-	}
 
-	return ram_end_pfn;
+	memblock_dump_all();
 }
 
 struct cpuinfo cpuinfo;
@@ -219,15 +208,6 @@ void __init or32_early_setup(void *fdt)
 	early_init_devtree(fdt);
 }
 
-static int __init openrisc_device_probe(void)
-{
-	of_platform_populate(NULL, NULL, NULL, NULL);
-
-	return 0;
-}
-
-device_initcall(openrisc_device_probe);
-
 static inline unsigned long extract_value_bits(unsigned long reg,
 					       short bit_nr, short width)
 {
@@ -282,8 +262,6 @@ void calibrate_delay(void)
 
 void __init setup_arch(char **cmdline_p)
 {
-	unsigned long max_low_pfn;
-
 	unflatten_and_copy_device_tree();
 
 	setup_cpuinfo();
@@ -304,8 +282,8 @@ void __init setup_arch(char **cmdline_p)
 	initrd_below_start_ok = 1;
 #endif
 
-	/* setup bootmem allocator */
+	/* setup memblock allocator */
-	max_low_pfn = setup_memory();
+	setup_memory();
 
 	/* paging_init() sets up the MMU and marks all pages as reserved */
 	paging_init();
@@ -317,7 +295,7 @@ void __init setup_arch(char **cmdline_p)
 
 	*cmdline_p = boot_command_line;
 
-	printk(KERN_INFO "OpenRISC Linux -- http://openrisc.net\n");
+	printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
 }
 
 static int show_cpuinfo(struct seq_file *m, void *v)

arch/openrisc/kernel/vmlinux.lds.S

@@ -30,7 +30,13 @@
 #include <asm/cache.h>
 #include <asm-generic/vmlinux.lds.h>
 
-OUTPUT_FORMAT("elf32-or32", "elf32-or32", "elf32-or32")
+#ifdef __OR1K__
+#define __OUTPUT_FORMAT        "elf32-or1k"
+#else
+#define __OUTPUT_FORMAT        "elf32-or32"
+#endif
+
+OUTPUT_FORMAT(__OUTPUT_FORMAT, __OUTPUT_FORMAT, __OUTPUT_FORMAT)
 jiffies = jiffies_64 + 4;
 
 SECTIONS

arch/openrisc/mm/init.c

@@ -106,11 +106,11 @@ static void __init map_ram(void)
 			}
 
 			/* Alloc one page for holding PTE's... */
-			pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+			pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
 			set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
 
 			/* Fill the newly allocated page with PTE'S */
-			for (j = 0; p < e && j < PTRS_PER_PGD;
+			for (j = 0; p < e && j < PTRS_PER_PTE;
 			     v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
 				if (v >= (u32) _e_kernel_ro ||
 				    v < (u32) _s_kernel_ro)

arch/openrisc/mm/ioremap.c

@@ -124,11 +124,7 @@ pte_t __ref *pte_alloc_one_kernel(struct mm_struct *mm,
 	if (likely(mem_init_done)) {
 		pte = (pte_t *) __get_free_page(GFP_KERNEL);
 	} else {
-		pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
-#if 0
-		/* FIXME: use memblock... */
 		pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
-#endif
 	}
 
 	if (pte)

drivers/video/console/Kconfig

@@ -9,7 +9,7 @@ config VGA_CONSOLE
 	depends on !4xx && !8xx && !SPARC && !M68K && !PARISC && !FRV && \
 		!SUPERH && !BLACKFIN && !AVR32 && !MN10300 && !CRIS && \
 		(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
-		!ARM64 && !ARC && !MICROBLAZE
+		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC
 	default y
 	help
 	  Saying Y here will allow you to use Linux in text mode through a