From patchwork Thu Jan 21 06:28:13 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 74260 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.2) with ESMTP id o0L6XBAf012066 for ; Thu, 21 Jan 2010 06:33:12 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754703Ab0AUGch (ORCPT ); Thu, 21 Jan 2010 01:32:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754874Ab0AUGc3 (ORCPT ); Thu, 21 Jan 2010 01:32:29 -0500 Received: from sca-es-mail-1.Sun.COM ([192.18.43.132]:36113 "EHLO sca-es-mail-1.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754632Ab0AUG3Z (ORCPT ); Thu, 21 Jan 2010 01:29:25 -0500 Received: from fe-sfbay-09.sun.com ([192.18.43.129]) by sca-es-mail-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id o0L6TOA2011752; Wed, 20 Jan 2010 22:29:24 -0800 (PST) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Received: from conversion-daemon.fe-sfbay-09.sun.com by fe-sfbay-09.sun.com (Sun Java(tm) System Messaging Server 7u2-7.04 64bit (built Jul 2 2009)) id <0KWL00600396VF00@fe-sfbay-09.sun.com>; Wed, 20 Jan 2010 22:29:24 -0800 (PST) Received: from localhost.localdomain ([unknown] [75.36.251.46]) by fe-sfbay-09.sun.com (Sun Java(tm) System Messaging Server 7u2-7.04 64bit (built Jul 2 2009)) with ESMTPSA id <0KWL003MR3C23V10@fe-sfbay-09.sun.com>; Wed, 20 Jan 2010 22:29:20 -0800 (PST) Date: Wed, 20 Jan 2010 22:28:13 -0800 From: Yinghai Lu Subject: [PATCH 26/36] x86: remove bios data range from e820 In-reply-to: <1264055303-15123-1-git-send-email-yinghai@kernel.org> To: Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton , Jesse Barnes , Christoph Lameter Cc: Linus Torvalds , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Yinghai Lu Message-id: <1264055303-15123-27-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.6.4.2 References: <1264055303-15123-1-git-send-email-yinghai@kernel.org> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 62235e7..09ca6e8 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -509,11 +509,19 @@ u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type, int checktype) { int i; + u64 end; u64 real_removed_size = 0; if (size > (ULLONG_MAX - start)) size = ULLONG_MAX - start; + end = start + size; + printk(KERN_DEBUG "e820 remove range: %016Lx - %016Lx ", + (unsigned long long) start, + (unsigned long long) end); + e820_print_type(old_type); + printk(KERN_CONT "\n"); + for (i = 0; i < e820.nr_map; i++) { struct e820entry *ei = &e820.map[i]; u64 final_start, final_end; diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c index 2e13544..adedeef 100644 --- a/arch/x86/kernel/head32.c +++ b/arch/x86/kernel/head32.c @@ -29,8 +29,6 @@ static void __init i386_default_early_setup(void) void __init i386_start_kernel(void) { - reserve_early_overlap_ok(0, PAGE_SIZE, "BIOS data page"); - #ifdef CONFIG_X86_TRAMPOLINE /* * But first pinch a few for the stack/trampoline stuff diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 452b7c4..b5a9896 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -98,8 +98,6 @@ void __init x86_64_start_reservations(char *real_mode_data) { copy_bootdata(__va(real_mode_data)); - reserve_early_overlap_ok(0, PAGE_SIZE, "BIOS data page"); - reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); #ifdef CONFIG_BLK_DEV_INITRD diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 824fef7..8b27c6c 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -659,6 +659,23 @@ static struct dmi_system_id __initdata bad_bios_dmi_table[] = { {} }; +static void __init e820_trim_bios_range(void) +{ + /* + * A special case is the first 4Kb of memory; + * This is a BIOS owned area, not kernel ram, but generally + * not listed as such in the E820 table. + */ + e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED); + /* + * special case: Some BIOSen report the PC BIOS + * area (640->1Mb) as ram even though it is not. + * take them out. + */ + e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1); + sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); +} + /* * Determine if we were loaded by an EFI loader. If so, then we have also been * passed the efi memmap, systab, etc., so we should use these data structures @@ -822,7 +839,7 @@ void __init setup_arch(char **cmdline_p) insert_resource(&iomem_resource, &data_resource); insert_resource(&iomem_resource, &bss_resource); - + e820_trim_bios_range(); #ifdef CONFIG_X86_32 if (ppro_with_ram_bug()) { e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM, diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 03c75ff..3c739b7 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -29,22 +29,6 @@ int page_is_ram(unsigned long pagenr) resource_size_t addr, end; int i; - /* - * A special case is the first 4Kb of memory; - * This is a BIOS owned area, not kernel ram, but generally - * not listed as such in the E820 table. - */ - if (pagenr == 0) - return 0; - - /* - * Second special case: Some BIOSen report the PC BIOS - * area (640->1Mb) as ram even though it is not. - */ - if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && - pagenr < (BIOS_END >> PAGE_SHIFT)) - return 0; - for (i = 0; i < e820.nr_map; i++) { /* * Not usable memory: