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From da39673d5d194e66c9ad70ad4de4e90ee69f0886 Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgross@suse.com>
Date: Fri, 7 Dec 2018 13:11:38 +0100
Subject: [PATCH 10/20] xen: Add PVH boot entry code
Add the code for the Xen PVH mode boot entry.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Hans van Kranenburg <hans@knorrie.org>
(cherry picked from commit 1a4d83af2fc1eb0a0951775a2b86860ab074c699)
---
grub-core/kern/i386/xen/startup_pvh.S | 52 +++++++++++++++++++++++++++
1 file changed, 52 insertions(+)
diff --git a/grub-core/kern/i386/xen/startup_pvh.S b/grub-core/kern/i386/xen/startup_pvh.S
index 69b8fdcca..363c31858 100644
--- a/grub-core/kern/i386/xen/startup_pvh.S
+++ b/grub-core/kern/i386/xen/startup_pvh.S
@@ -19,11 +19,63 @@
#include <config.h>
#include <grub/symbol.h>
+#include <grub/machine/memory.h>
.file "startup_pvh.S"
.text
+ .globl start, _start
+ .code32
+start:
+_start:
+ cld
+ lgdt gdtdesc
+ ljmp $GRUB_MEMORY_MACHINE_PROT_MODE_CSEG, $1f
+1:
+ movl $GRUB_MEMORY_MACHINE_PROT_MODE_DSEG, %eax
+ mov %eax, %ds
+ mov %eax, %es
+ mov %eax, %fs
+ mov %eax, %gs
+ mov %eax, %ss
+ leal LOCAL(stack_end), %esp
+
+ /* Save address of start info structure. */
+ mov %ebx, pvh_start_info
+ call EXT_C(grub_main)
+ /* Doesn't return. */
+
+ .p2align 3
+gdt:
+ .word 0, 0
+ .byte 0, 0, 0, 0
+
+ /* -- code segment --
+ * base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
+ * type = 32bit code execute/read, DPL = 0
+ */
+ .word 0xFFFF, 0
+ .byte 0, 0x9A, 0xCF, 0
+
+ /* -- data segment --
+ * base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
+ * type = 32 bit data read/write, DPL = 0
+ */
+ .word 0xFFFF, 0
+ .byte 0, 0x92, 0xCF, 0
+
+ .p2align 3
+/* this is the GDT descriptor */
+gdtdesc:
+ .word 0x17 /* limit */
+ .long gdt /* addr */
+
+ .p2align 2
/* Saved pointer to start info structure. */
.globl pvh_start_info
pvh_start_info:
.long 0
+
+ .bss
+ .space GRUB_MEMORY_MACHINE_PROT_STACK_SIZE
+LOCAL(stack_end):
--
2.21.0
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