linux-kernel - Re: [PATCH] x86: extend e820 ealy_res support 32bit

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Message-ID: <483D2D8A.5040800@goop.org>
Date:	Wed, 28 May 2008 11:01:46 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: extend e820 ealy_res support 32bit - fix #2

Yinghai Lu wrote:
>
> can you try attached patch?
>   

Thanks, that nearly works.  I needed the patch below to get it to 
successfully boot.

For reference, this is what the early reserve map looks like now:

(early) 256MB LOWMEM available.
(early)   low ram: 02634000 - 10000000
(early)   bootmap 02634000 - 02636000
(early)   early res: 0 [0-fff] BIOS data page
(early)   early res: 1 [1000-1fff] EX TRAMPOLINE
(early)   early res: 2 [6000-6fff] TRAMPOLINE
(early)   early res: 3 [25db000-261dfff] XEN
(early)   early res: 4 [1000000-18a8303] TEXT DATA BSS
(early)   early res: 5 [18a9000-25dafff] RAMDISK
(early)   early res: 6 [261e000-2633fff] INIT_PG_TABLE
(early)   early res: 7 [2634000-2635fff] BOOTMAP


    J


Subject: xen: reserve_early Xen-specific memory

Make sure that the start_info and pfn->mfn translation array are reserved.
i386_start_kernel will arrange to reserve the kernel code/data, initrd
and pagetable.

Also, add prototype for i386_start_kernel.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/enlighten.c |    9 +++++++++
 include/asm-x86/setup.h  |    1 +
 2 files changed, 10 insertions(+)

===================================================================
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1266,6 +1266,15 @@
 		add_preferred_console("hvc", 0, NULL);
 	}
 
+	/*
+	 * Reserve Xen bits:
+	 *  - mfn_list
+	 *  - xen_start_info
+	 * See comment above "struct start_info" in <xen/interface/xen.h>
+	 */
+	reserve_early(__pa(xen_start_info->mfn_list),
+		      __pa(xen_start_info->pt_base), "XEN");
+
 	/* Start the world */
 	i386_start_kernel();
 }
===================================================================
--- a/include/asm-x86/setup.h
+++ b/include/asm-x86/setup.h
@@ -58,6 +58,7 @@
 int __init copy_e820_map(struct e820entry *biosmap, int nr_map);
 void __init add_memory_region(unsigned long long start,
 			      unsigned long long size, int type);
+void __init i386_start_kernel(void);
 
 extern unsigned long init_pg_tables_start;
 extern unsigned long init_pg_tables_end;


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