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https://gitlab.alpinelinux.org/alpine/aports.git
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c40e9ceff3
* Backport xen_pvh patches from grub master branch * Adds grub-i386-xen_pvh.bin to the grub-xenhost package
87 lines
2.0 KiB
Diff
87 lines
2.0 KiB
Diff
From da39673d5d194e66c9ad70ad4de4e90ee69f0886 Mon Sep 17 00:00:00 2001
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From: Juergen Gross <jgross@suse.com>
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Date: Fri, 7 Dec 2018 13:11:38 +0100
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Subject: [PATCH 10/20] xen: Add PVH boot entry code
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Add the code for the Xen PVH mode boot entry.
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Signed-off-by: Juergen Gross <jgross@suse.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Tested-by: Hans van Kranenburg <hans@knorrie.org>
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(cherry picked from commit 1a4d83af2fc1eb0a0951775a2b86860ab074c699)
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---
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grub-core/kern/i386/xen/startup_pvh.S | 52 +++++++++++++++++++++++++++
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1 file changed, 52 insertions(+)
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diff --git a/grub-core/kern/i386/xen/startup_pvh.S b/grub-core/kern/i386/xen/startup_pvh.S
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index 69b8fdcca..363c31858 100644
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--- a/grub-core/kern/i386/xen/startup_pvh.S
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+++ b/grub-core/kern/i386/xen/startup_pvh.S
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@@ -19,11 +19,63 @@
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#include <config.h>
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#include <grub/symbol.h>
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+#include <grub/machine/memory.h>
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.file "startup_pvh.S"
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.text
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+ .globl start, _start
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+ .code32
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+start:
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+_start:
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+ cld
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+ lgdt gdtdesc
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+ ljmp $GRUB_MEMORY_MACHINE_PROT_MODE_CSEG, $1f
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+1:
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+ movl $GRUB_MEMORY_MACHINE_PROT_MODE_DSEG, %eax
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+ mov %eax, %ds
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+ mov %eax, %es
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+ mov %eax, %fs
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+ mov %eax, %gs
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+ mov %eax, %ss
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+ leal LOCAL(stack_end), %esp
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+
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+ /* Save address of start info structure. */
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+ mov %ebx, pvh_start_info
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+ call EXT_C(grub_main)
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+ /* Doesn't return. */
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+
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+ .p2align 3
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+gdt:
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+ .word 0, 0
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+ .byte 0, 0, 0, 0
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+
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+ /* -- code segment --
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+ * base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
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+ * type = 32bit code execute/read, DPL = 0
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+ */
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+ .word 0xFFFF, 0
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+ .byte 0, 0x9A, 0xCF, 0
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+
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+ /* -- data segment --
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+ * base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
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+ * type = 32 bit data read/write, DPL = 0
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+ */
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+ .word 0xFFFF, 0
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+ .byte 0, 0x92, 0xCF, 0
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+
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+ .p2align 3
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+/* this is the GDT descriptor */
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+gdtdesc:
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+ .word 0x17 /* limit */
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+ .long gdt /* addr */
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+
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+ .p2align 2
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/* Saved pointer to start info structure. */
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.globl pvh_start_info
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pvh_start_info:
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.long 0
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+
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+ .bss
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+ .space GRUB_MEMORY_MACHINE_PROT_STACK_SIZE
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+LOCAL(stack_end):
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--
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2.21.0
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