Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752917AbbBVG1x (ORCPT ); Sun, 22 Feb 2015 01:27:53 -0500 Received: from mail1.asahi-net.or.jp ([202.224.39.197]:37302 "EHLO mail1.asahi-net.or.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752027AbbBVGZ0 (ORCPT ); Sun, 22 Feb 2015 01:25:26 -0500 From: Yoshinori Sato To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Cc: Yoshinori Sato Subject: [PATCH v5 08/15] h8300: Memory management Date: Sun, 22 Feb 2015 15:25:13 +0900 Message-Id: <1424586320-3144-9-git-send-email-ysato@users.sourceforge.jp> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1424586320-3144-1-git-send-email-ysato@users.sourceforge.jp> References: <1424586320-3144-1-git-send-email-ysato@users.sourceforge.jp> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9371 Lines: 361 Signed-off-by: Yoshinori Sato --- arch/h8300/mm/Makefile | 5 ++ arch/h8300/mm/fault.c | 57 +++++++++++++++++++++ arch/h8300/mm/init.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++ arch/h8300/mm/kmap.c | 61 +++++++++++++++++++++++ arch/h8300/mm/memory.c | 53 ++++++++++++++++++++ 5 files changed, 309 insertions(+) create mode 100644 arch/h8300/mm/Makefile create mode 100644 arch/h8300/mm/fault.c create mode 100644 arch/h8300/mm/init.c create mode 100644 arch/h8300/mm/kmap.c create mode 100644 arch/h8300/mm/memory.c diff --git a/arch/h8300/mm/Makefile b/arch/h8300/mm/Makefile new file mode 100644 index 0000000..117d71f --- /dev/null +++ b/arch/h8300/mm/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for the linux h8300-specific parts of the memory manager. +# + +obj-y := init.o fault.o memory.o kmap.o diff --git a/arch/h8300/mm/fault.c b/arch/h8300/mm/fault.c new file mode 100644 index 0000000..5924ff5 --- /dev/null +++ b/arch/h8300/mm/fault.c @@ -0,0 +1,57 @@ +/* + * linux/arch/h8300/mm/fault.c + * + * Copyright (C) 1998 D. Jeff Dionne , + * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) + * + * Based on: + * + * linux/arch/m68knommu/mm/fault.c + * linux/arch/m68k/mm/fault.c + * + * Copyright (C) 1995 Hamish Macdonald + */ + +#include +#include +#include +#include + +#include + +void die(const char *str, struct pt_regs *fp, unsigned long err); + +/* + * This routine handles page faults. It determines the problem, and + * then passes it off to one of the appropriate routines. + * + * error_code: + * bit 0 == 0 means no page found, 1 means protection fault + * bit 1 == 0 means read, 1 means write + * + * If this routine detects a bad access, it returns 1, otherwise it + * returns 0. + */ +asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address, + unsigned long error_code) +{ +#ifdef DEBUG + pr_debug("regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n", + regs->sr, regs->pc, address, error_code); +#endif + +/* + * Oops. The kernel tried to access some bad page. We'll have to + * terminate things with extreme prejudice. + */ + if ((unsigned long) address < PAGE_SIZE) + pr_alert("Unable to handle kernel NULL pointer dereference"); + else + pr_alert("Unable to handle kernel access"); + printk(" at virtual address %08lx\n", address); + if (!user_mode(regs)) + die("Oops", regs, error_code); + do_exit(SIGKILL); + + return 1; +} diff --git a/arch/h8300/mm/init.c b/arch/h8300/mm/init.c new file mode 100644 index 0000000..98028b1 --- /dev/null +++ b/arch/h8300/mm/init.c @@ -0,0 +1,133 @@ +/* + * linux/arch/h8300/mm/init.c + * + * Copyright (C) 1998 D. Jeff Dionne , + * Kenneth Albanowski , + * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) + * + * Based on: + * + * linux/arch/m68knommu/mm/init.c + * linux/arch/m68k/mm/init.c + * + * Copyright (C) 1995 Hamish Macdonald + * + * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com) + * DEC/2000 -- linux 2.4 support + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +/* + * BAD_PAGE is the page that is used for page faults when linux + * is out-of-memory. Older versions of linux just did a + * do_exit(), but using this instead means there is less risk + * for a process dying in kernel mode, possibly leaving a inode + * unused etc.. + * + * BAD_PAGETABLE is the accompanying page-table: it is initialized + * to point to BAD_PAGE entries. + * + * ZERO_PAGE is a special page that is used for zero-initialized + * data and COW. + */ +static unsigned long empty_bad_page_table; +static unsigned long empty_bad_page; +unsigned long empty_zero_page; + +/* + * paging_init() continues the virtual memory environment setup which + * was begun by the code in arch/head.S. + * The parameters are pointers to where to stick the starting and ending + * addresses of available kernel virtual memory. + */ +void __init paging_init(void) +{ + /* + * Make sure start_mem is page aligned, otherwise bootmem and + * page_alloc get different views og the world. + */ + unsigned long start_mem = PAGE_ALIGN(memory_start); + unsigned long end_mem = memory_end & PAGE_MASK; + + pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n", + start_mem, end_mem); + + /* + * Initialize the bad page table and bad page to point + * to a couple of allocated pages. + */ + empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); + empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); + empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); + memset((void *)empty_zero_page, 0, PAGE_SIZE); + + /* + * Set up SFC/DFC registers (user data space). + */ + set_fs(USER_DS); + + pr_debug("before free_area_init\n"); + + pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", + start_mem, end_mem); + + { + unsigned long zones_size[MAX_NR_ZONES] = {0, }; + + zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; + free_area_init(zones_size); + } +} + +void __init mem_init(void) +{ + unsigned long codesize = _etext - _stext; + + pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end); + + high_memory = (void *) (memory_end & PAGE_MASK); + max_mapnr = MAP_NR(high_memory); + + /* this will put all low memory onto the freelists */ + free_all_bootmem(); + + mem_init_print_info(NULL); + if (rom_length > 0 && rom_length > codesize) + pr_info("Memory available: %luK/%luK ROM\n", + (rom_length - codesize) >> 10, rom_length >> 10); +} + + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, -1, "initrd"); +} +#endif + +void +free_initmem(void) +{ + free_initmem_default(-1); +} diff --git a/arch/h8300/mm/kmap.c b/arch/h8300/mm/kmap.c new file mode 100644 index 0000000..4315aa3 --- /dev/null +++ b/arch/h8300/mm/kmap.c @@ -0,0 +1,61 @@ +/* + * linux/arch/h8300/mm/kmap.c + * + * Based on + * linux/arch/m68knommu/mm/kmap.c + * + * Copyright (C) 2000 Lineo, + * Copyright (C) 2000-2002 David McCullough + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#undef DEBUG + +#define VIRT_OFFSET (0x01000000) + +/* + * Map some physical address range into the kernel address space. + */ +void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag) +{ + return (void *)(physaddr + VIRT_OFFSET); +} +EXPORT_SYMBOL(__ioremap); + +/* + * Unmap a ioremap()ed region again. + */ +void iounmap(void *addr) +{ +} +EXPORT_SYMBOL(iounmap); + +/* + * __iounmap unmaps nearly everything, so be careful + * it doesn't free currently pointer/page tables anymore but it + * wans't used anyway and might be added later. + */ +void __iounmap(void *addr, unsigned long size) +{ +} + +/* + * Set new cache mode for some kernel address space. + * The caller must push data for that range itself, if such data may already + * be in the cache. + */ +void kernel_set_cachemode(void *addr, unsigned long size, int cmode) +{ +} diff --git a/arch/h8300/mm/memory.c b/arch/h8300/mm/memory.c new file mode 100644 index 0000000..4974aa4 --- /dev/null +++ b/arch/h8300/mm/memory.c @@ -0,0 +1,53 @@ +/* + * linux/arch/h8300/mm/memory.c + * + * Copyright (C) 2002 Yoshinori Sato , + * + * Based on: + * + * linux/arch/m68knommu/mm/memory.c + * + * Copyright (C) 1998 Kenneth Albanowski , + * Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com) + * + * Based on: + * + * linux/arch/m68k/mm/memory.c + * + * Copyright (C) 1995 Hamish Macdonald + */ + +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +void cache_clear(unsigned long paddr, int len) +{ +} + + +void cache_push(unsigned long paddr, int len) +{ +} + +void cache_push_v(unsigned long vaddr, int len) +{ +} + +/* + * Map some physical address range into the kernel address space. + */ + +unsigned long kernel_map(unsigned long paddr, unsigned long size, + int nocacheflag, unsigned long *memavailp) +{ + return paddr; 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