Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758156Ab2J2Ine (ORCPT ); Mon, 29 Oct 2012 04:43:34 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:58950 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1757817Ab2J2InI (ORCPT ); Mon, 29 Oct 2012 04:43:08 -0400 X-IronPort-AV: E=Sophos;i="4.80,670,1344182400"; d="scan'208";a="6091105" From: Wen Congyang To: x86@kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: Rob Landley , Thomas Gleixner , Ingo Molnar , bhelgaas@google.com, "H. Peter Anvin" , Yasuaki Ishimatsu , KOSAKI Motohiro , Andrew Morton , Wen Congyang Subject: [PATCH v3 2/2] x86: make 'mem=' option to work for efi platform Date: Mon, 29 Oct 2012 16:48:44 +0800 Message-Id: <1351500524-23907-3-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1351500524-23907-1-git-send-email-wency@cn.fujitsu.com> References: <1351500524-23907-1-git-send-email-wency@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/29 16:42:20, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/29 16:42:24, Serialize complete at 2012/10/29 16:42:24 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2598 Lines: 89 Current mem boot option only can work for non efi environment. If the user specifies add_efi_memmap, it cannot work for efi environment. In the efi environment, we call e820_add_region() to add the memory map. So we can modify __e820_add_region() and the mem boot option can work for efi environment. Signed-off-by: Wen Congyang --- arch/x86/kernel/e820.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index df06ade..b15b341 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -47,6 +47,7 @@ unsigned long pci_mem_start = 0xaeedbabe; #ifdef CONFIG_PCI EXPORT_SYMBOL(pci_mem_start); #endif +static u64 mem_limit = ~0ULL; /* * This function checks if any part of the range is mapped @@ -119,6 +120,20 @@ static void __init __e820_add_region(struct e820map *e820x, u64 start, u64 size, return; } + if (start >= mem_limit) { + printk(KERN_ERR "e820: ignoring [mem %#010llx-%#010llx]\n", + (unsigned long long)start, + (unsigned long long)(start + size - 1)); + return; + } + + if (mem_limit - start < size) { + printk(KERN_ERR "e820: ignoring [mem %#010llx-%#010llx]\n", + (unsigned long long)mem_limit, + (unsigned long long)(start + size - 1)); + size = mem_limit - start; + } + e820x->map[x].addr = start; e820x->map[x].size = size; e820x->map[x].type = type; @@ -809,7 +824,7 @@ static int userdef __initdata; /* "mem=nopentium" disables the 4MB page tables. */ static int __init parse_memopt(char *p) { - u64 mem_size; + char *oldp; if (!p) return -EINVAL; @@ -825,11 +840,11 @@ static int __init parse_memopt(char *p) } userdef = 1; - mem_size = memparse(p, &p); + oldp = p; + mem_limit = memparse(p, &p); /* don't remove all of memory when handling "mem={invalid}" param */ - if (mem_size == 0) + if (mem_limit == 0 || p == oldp) return -EINVAL; - e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1); return 0; } @@ -881,6 +896,12 @@ early_param("memmap", parse_memmap_opt); void __init finish_e820_parsing(void) { + if (mem_limit != ~0ULL) { + userdef = 1; + e820_remove_range(mem_limit, ULLONG_MAX - mem_limit, + E820_RAM, 1); + } + if (userdef) { u32 nr = e820.nr_map; -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/