i386: paravirt boot sequence

This patch uses the updated boot protocol to do paravirtualized boot.
If the boot version is >= 2.07, then it will do two things:

 1. Check the bootparams loadflags to see if we should reload the
    segment registers and clear interrupts.  This is appropriate
    for normal native boot and some paravirtualized environments, but
    inapproprate for others.

 2. Check the hardware architecture, and dispatch to the appropriate
    kernel entrypoint.  If the bootloader doesn't set this, then we
    simply do the normal boot sequence.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Zachary Amsden <zach@vmware.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 16 insertions, 2 deletions

diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index f35ea2237522..a0ae2e7f6cec 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -27,13 +27,22 @@
 #include <asm/segment.h>
 #include <asm/page.h>
 #include <asm/boot.h>
+#include <asm/asm-offsets.h>
 
 .section ".text.head","ax",@progbits
         .globl startup_32
 
 startup_32:
-        cld
-        cli
+        /* check to see if KEEP_SEGMENTS flag is meaningful */
+        cmpw $0x207, BP_version(%esi)
+        jb 1f
+
+        /* test KEEP_SEGMENTS flag to see if the bootloader is asking
+         * us to not reload segments */
+        testb $(1<<6), BP_loadflags(%esi)
+        jnz 2f
+
+1:      cli
         movl $(__BOOT_DS),%eax
         movl %eax,%ds
         movl %eax,%es
@@ -41,6 +50,8 @@ startup_32:
         movl %eax,%gs
         movl %eax,%ss
 
+2:      cld
+
 /* Calculate the delta between where we were compiled to run
  * at and where we were actually loaded at.  This can only be done
  * with a short local call on x86.  Nothing  else will tell us what
diff --git a/arch/x86/boot/compressed/misc_32.c b/arch/x86/boot/compressed/misc_32.c
index 1dc1e19c0a9f..b74d60d1b2fa 100644
--- a/arch/x86/boot/compressed/misc_32.c
+++ b/arch/x86/boot/compressed/misc_32.c
@@ -247,6 +247,9 @@ static void putstr(const char *s)
         int x,y,pos;
         char c;
 
+        if (RM_SCREEN_INFO.orig_video_mode == 0 && lines == 0 && cols == 0)
+                return;
+
         x = RM_SCREEN_INFO.orig_x;
         y = RM_SCREEN_INFO.orig_y;