369 lines
9.1 KiB
Diff
369 lines
9.1 KiB
Diff
From f72d640713d01b3b704c6e84ab49b62f19fc9c22 Mon Sep 17 00:00:00 2001
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From: Kyle McMartin <kyle@phobos.i.jkkm.org>
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Date: Tue, 30 Mar 2010 00:16:25 -0400
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Subject: [PATCH] dev-crash-driver.patch
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---
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arch/ia64/include/asm/crash.h | 90 +++++++++++++++++++++++++++++
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arch/ia64/kernel/ia64_ksyms.c | 3 +
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arch/x86/include/asm/crash.h | 75 ++++++++++++++++++++++++
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arch/x86/mm/ioremap.c | 2 +
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drivers/char/Kconfig | 3 +
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drivers/char/Makefile | 2 +
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drivers/char/crash.c | 128 +++++++++++++++++++++++++++++++++++++++++
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7 files changed, 303 insertions(+), 0 deletions(-)
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create mode 100644 arch/ia64/include/asm/crash.h
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create mode 100644 arch/x86/include/asm/crash.h
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create mode 100644 drivers/char/crash.c
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diff --git a/arch/ia64/include/asm/crash.h b/arch/ia64/include/asm/crash.h
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new file mode 100644
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index 0000000..541af84
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--- /dev/null
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+++ b/arch/ia64/include/asm/crash.h
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@@ -0,0 +1,90 @@
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+#ifndef _ASM_IA64_CRASH_H
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+#define _ASM_IA64_CRASH_H
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+
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+/*
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+ * linux/include/asm-ia64/crash.h
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+ *
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+ * Copyright (c) 2004 Red Hat, Inc. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2, or (at your option)
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+ * any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#ifdef __KERNEL__
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+
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+#include <linux/efi.h>
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+#include <linux/mm.h>
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+#include <asm/mmzone.h>
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+
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+static inline void *
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+map_virtual(u64 offset, struct page **pp)
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+{
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+ struct page *page;
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+ unsigned long pfn;
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+ u32 type;
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+
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+ if (REGION_NUMBER(offset) == 5) {
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+ char byte;
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+
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+ if (__get_user(byte, (char *)offset) == 0)
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+ return (void *)offset;
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+ else
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+ return NULL;
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+ }
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+
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+ switch (type = efi_mem_type(offset))
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+ {
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+ case EFI_LOADER_CODE:
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+ case EFI_LOADER_DATA:
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+ case EFI_BOOT_SERVICES_CODE:
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+ case EFI_BOOT_SERVICES_DATA:
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+ case EFI_CONVENTIONAL_MEMORY:
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+ break;
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+
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+ default:
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+ printk(KERN_INFO
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+ "crash memory driver: invalid memory type for %lx: %d\n",
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+ offset, type);
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+ return NULL;
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+ }
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+
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+ pfn = offset >> PAGE_SHIFT;
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+
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+ if (!pfn_valid(pfn)) {
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+ printk(KERN_INFO
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+ "crash memory driver: invalid pfn: %lx )\n", pfn);
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+ return NULL;
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+ }
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+
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+ page = pfn_to_page(pfn);
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+
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+ if (!page->virtual) {
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+ printk(KERN_INFO
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+ "crash memory driver: offset: %lx page: %lx page->virtual: NULL\n",
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+ offset, (unsigned long)page);
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+ return NULL;
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+ }
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+
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+ return (page->virtual + (offset & (PAGE_SIZE-1)));
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+}
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+
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+static inline void unmap_virtual(struct page *page)
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+{
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+ return;
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+}
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+
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+#endif /* __KERNEL__ */
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+
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+#endif /* _ASM_IA64_CRASH_H */
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diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c
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index 7f4a0ed..552fe24 100644
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--- a/arch/ia64/kernel/ia64_ksyms.c
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+++ b/arch/ia64/kernel/ia64_ksyms.c
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@@ -84,6 +84,9 @@ EXPORT_SYMBOL(ia64_save_scratch_fpregs);
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#include <asm/unwind.h>
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EXPORT_SYMBOL(unw_init_running);
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+#include <linux/efi.h>
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+EXPORT_SYMBOL_GPL(efi_mem_type);
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+
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#if defined(CONFIG_IA64_ESI) || defined(CONFIG_IA64_ESI_MODULE)
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extern void esi_call_phys (void);
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EXPORT_SYMBOL_GPL(esi_call_phys);
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diff --git a/arch/x86/include/asm/crash.h b/arch/x86/include/asm/crash.h
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new file mode 100644
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index 0000000..dfcc006
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--- /dev/null
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+++ b/arch/x86/include/asm/crash.h
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@@ -0,0 +1,73 @@
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+#ifndef _ASM_I386_CRASH_H
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+#define _ASM_I386_CRASH_H
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+
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+/*
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+ * linux/include/asm-i386/crash.h
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+ *
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+ * Copyright (c) 2004 Red Hat, Inc. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2, or (at your option)
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+ * any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#ifdef __KERNEL__
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+
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+#include <linux/mm.h>
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+#include <linux/highmem.h>
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+#include <asm/mmzone.h>
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+
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+static inline void *
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+map_virtual(u64 offset, struct page **pp)
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+{
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+ struct page *page;
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+ unsigned long pfn;
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+ void *vaddr;
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+
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+ pfn = (unsigned long)(offset >> PAGE_SHIFT);
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+
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+ if (!page_is_ram(pfn)) {
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+ printk(KERN_INFO
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+ "crash memory driver: !page_is_ram(pfn: %lx)\n", pfn);
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+ return NULL;
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+ }
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+
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+ if (!pfn_valid(pfn)) {
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+ printk(KERN_INFO
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+ "crash memory driver: invalid pfn: %lx )\n", pfn);
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+ return NULL;
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+ }
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+
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+ page = pfn_to_page(pfn);
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+
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+ vaddr = kmap(page);
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+ if (!vaddr) {
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+ printk(KERN_INFO
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+ "crash memory driver: pfn: %lx kmap(page: %lx) failed\n",
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+ pfn, (unsigned long)page);
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+ return NULL;
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+ }
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+
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+ *pp = page;
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+ return (vaddr + (offset & (PAGE_SIZE-1)));
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+}
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+
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+static inline void unmap_virtual(struct page *page)
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+{
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+ kunmap(page);
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+}
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+
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+#endif /* __KERNEL__ */
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+
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+#endif /* _ASM_I386_CRASH_H */
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diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
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index 423fd56..e04a561 100644
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--- a/drivers/char/Kconfig
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+++ b/drivers/char/Kconfig
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@@ -4,6 +4,9 @@
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menu "Character devices"
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+config CRASH
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+ tristate "Crash Utility memory driver"
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+
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source "drivers/tty/Kconfig"
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config DEVKMEM
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diff --git a/drivers/char/Makefile b/drivers/char/Makefile
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index 32762ba..3d5d525 100644
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--- a/drivers/char/Makefile
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+++ b/drivers/char/Makefile
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@@ -65,3 +65,5 @@ obj-$(CONFIG_JS_RTC) += js-rtc.o
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js-rtc-y = rtc.o
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obj-$(CONFIG_TILE_SROM) += tile-srom.o
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+
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+obj-$(CONFIG_CRASH) += crash.o
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diff --git a/drivers/char/crash.c b/drivers/char/crash.c
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new file mode 100644
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index 0000000..e5437de
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--- /dev/null
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+++ b/drivers/char/crash.c
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@@ -0,0 +1,128 @@
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+/*
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+ * linux/drivers/char/crash.c
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+ *
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+ * Copyright (C) 2004 Dave Anderson <anderson@redhat.com>
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+ * Copyright (C) 2004 Red Hat, Inc.
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+ */
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+
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+/******************************************************************************
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2, or (at your option)
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+ * any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ *****************************************************************************/
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+
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+#include <linux/module.h>
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+#include <linux/types.h>
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+#include <linux/miscdevice.h>
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+#include <linux/init.h>
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+#include <asm/io.h>
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+#include <asm/uaccess.h>
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+#include <asm/types.h>
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+#include <asm/crash.h>
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+
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+#define CRASH_VERSION "1.0"
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+
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+/*
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+ * These are the file operation functions that allow crash utility
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+ * access to physical memory.
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+ */
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+
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+static loff_t
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+crash_llseek(struct file * file, loff_t offset, int orig)
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+{
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+ switch (orig) {
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+ case 0:
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+ file->f_pos = offset;
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+ return file->f_pos;
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+ case 1:
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+ file->f_pos += offset;
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+ return file->f_pos;
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+ default:
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+ return -EINVAL;
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+ }
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+}
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+
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+/*
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+ * Determine the page address for an address offset value,
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+ * get a virtual address for it, and copy it out.
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+ * Accesses must fit within a page.
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+ */
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+static ssize_t
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+crash_read(struct file *file, char *buf, size_t count, loff_t *poff)
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+{
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+ void *vaddr;
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+ struct page *page;
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+ u64 offset;
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+ ssize_t read;
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+
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+ offset = *poff;
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+ if (offset >> PAGE_SHIFT != (offset+count-1) >> PAGE_SHIFT)
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+ return -EINVAL;
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+
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+ vaddr = map_virtual(offset, &page);
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+ if (!vaddr)
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+ return -EFAULT;
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+
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+ if (copy_to_user(buf, vaddr, count)) {
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+ unmap_virtual(page);
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+ return -EFAULT;
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+ }
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+ unmap_virtual(page);
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+
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+ read = count;
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+ *poff += read;
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+ return read;
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+}
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+
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+static struct file_operations crash_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = crash_llseek,
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+ .read = crash_read,
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+};
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+
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+static struct miscdevice crash_dev = {
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+ MISC_DYNAMIC_MINOR,
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+ "crash",
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+ &crash_fops
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+};
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+
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+static int __init
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+crash_init(void)
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+{
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+ int ret;
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+
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+ ret = misc_register(&crash_dev);
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+ if (ret) {
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+ printk(KERN_ERR
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+ "crash memory driver: cannot misc_register (MISC_DYNAMIC_MINOR)\n");
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+ goto out;
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+ }
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+
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+ ret = 0;
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+ printk(KERN_INFO "crash memory driver: version %s\n", CRASH_VERSION);
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+out:
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+ return ret;
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+}
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+
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+static void __exit
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+crash_cleanup_module(void)
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+{
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+ misc_deregister(&crash_dev);
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+}
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+
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+module_init(crash_init);
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+module_exit(crash_cleanup_module);
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+
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+MODULE_LICENSE("GPL");
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--
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1.7.6
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