[PATCH v6.1 09/20] xen: add basic hooks for PVH in current code

[Juergen Gross]

Add the hooks to current code needed for Xen PVH. They will be filled
with code later when the related functionality is being added.

loader/i386/linux.c needs to include machine/kernel.h now as it needs
to get GRUB_KERNEL_USE_RSDP_ADDR from there. This in turn requires to
add an empty kernel.h header for some i386 platforms (efi, coreboot,
ieee1275, xen).

Signed-off-by: Juergen Gross <address@hidden>
Reviewed-by: Daniel Kiper <address@hidden>
---
V3: xenpvh->xen_pvh (Daniel Kiper)
    adjust copyright date (Roger Pau Monné)
V5: update commit message (Daniel Kiper)
    move including xen/hvm/start_info.h to the sources really needing
      it (Daniel Kiper)
V6.1: add empty kernel.h headers for i386 platforms
    It should be noted that i386_efi build is broken even without this
    patch, but this is clearly beyond the scope of this series.
---
 grub-core/Makefile.am                 |  5 +++++
 grub-core/kern/i386/xen/pvh.c         | 37 +++++++++++++++++++++++++++++++++++
 grub-core/kern/i386/xen/startup_pvh.S | 29 +++++++++++++++++++++++++++
 grub-core/kern/xen/init.c             |  4 ++++
 grub-core/loader/i386/linux.c         |  1 +
 include/grub/i386/coreboot/kernel.h   |  0
 include/grub/i386/ieee1275/kernel.h   |  0
 include/grub/i386/xen/kernel.h        |  0
 include/grub/i386/xen_pvh/kernel.h    | 30 ++++++++++++++++++++++++++++
 include/grub/xen.h                    |  5 +++++
 10 files changed, 111 insertions(+)
 create mode 100644 grub-core/kern/i386/xen/pvh.c
 create mode 100644 grub-core/kern/i386/xen/startup_pvh.S
 create mode 100644 include/grub/i386/coreboot/kernel.h
 create mode 100644 include/grub/i386/ieee1275/kernel.h
 create mode 100644 include/grub/i386/xen/kernel.h
 create mode 100644 include/grub/i386/xen_pvh/kernel.h

diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am
index f4ff62b76..89433f498 100644
--- a/grub-core/Makefile.am
+++ b/grub-core/Makefile.am
@@ -102,6 +102,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
 endif
 
 if COND_i386_efi
+KERNEL_HEADER_FILES += $(top_builddir)/include/grub/machine/kernel.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/efi.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/disk.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
@@ -111,6 +112,7 @@ KERNEL_HEADER_FILES += 
$(top_srcdir)/include/grub/i386/pmtimer.h
 endif
 
 if COND_i386_coreboot
+KERNEL_HEADER_FILES += $(top_builddir)/include/grub/machine/kernel.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/coreboot/lbio.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/video.h
@@ -122,6 +124,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
 endif
 
 if COND_i386_multiboot
+KERNEL_HEADER_FILES += $(top_builddir)/include/grub/machine/kernel.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/acpi.h
 endif
@@ -132,6 +135,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
 endif
 
 if COND_i386_ieee1275
+KERNEL_HEADER_FILES += $(top_builddir)/include/grub/machine/kernel.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/ieee1275/ieee1275.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/terminfo.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/extcmd.h
@@ -140,6 +144,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/tsc.h
 endif
 
 if COND_i386_xen
+KERNEL_HEADER_FILES += $(top_builddir)/include/grub/machine/kernel.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/xen.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i386/xen/hypercall.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/terminfo.h
diff --git a/grub-core/kern/i386/xen/pvh.c b/grub-core/kern/i386/xen/pvh.c
new file mode 100644
index 000000000..4f629b15e
--- /dev/null
+++ b/grub-core/kern/i386/xen/pvh.c
@@ -0,0 +1,37 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/memory.h>
+#include <grub/mm.h>
+#include <grub/xen.h>
+#include <xen/hvm/start_info.h>
+#include <grub/machine/kernel.h>
+
+grub_uint64_t grub_rsdp_addr;
+
+void
+grub_xen_setup_pvh (void)
+{
+}
+
+grub_err_t
+grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
+{
+}
diff --git a/grub-core/kern/i386/xen/startup_pvh.S 
b/grub-core/kern/i386/xen/startup_pvh.S
new file mode 100644
index 000000000..69b8fdcca
--- /dev/null
+++ b/grub-core/kern/i386/xen/startup_pvh.S
@@ -0,0 +1,29 @@
+/* startup.S - bootstrap GRUB itself */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <grub/symbol.h>
+
+       .file   "startup_pvh.S"
+       .text
+
+/* Saved pointer to start info structure. */
+       .globl  pvh_start_info
+pvh_start_info:
+       .long   0
diff --git a/grub-core/kern/xen/init.c b/grub-core/kern/xen/init.c
index a23dad633..782ca7295 100644
--- a/grub-core/kern/xen/init.c
+++ b/grub-core/kern/xen/init.c
@@ -564,6 +564,10 @@ grub_machine_init (void)
                           + GRUB_KERNEL_MACHINE_MOD_GAP,
                           GRUB_KERNEL_MACHINE_MOD_ALIGN);
 
+#ifdef GRUB_MACHINE_XEN_PVH
+  grub_xen_setup_pvh ();
+#endif
+
   grub_xen_setup_gnttab ();
 
 #ifdef GRUB_MACHINE_XEN
diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
index 375ee80dc..b6015913b 100644
--- a/grub-core/loader/i386/linux.c
+++ b/grub-core/loader/i386/linux.c
@@ -35,6 +35,7 @@
 #include <grub/i18n.h>
 #include <grub/lib/cmdline.h>
 #include <grub/linux.h>
+#include <grub/machine/kernel.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
diff --git a/include/grub/i386/coreboot/kernel.h 
b/include/grub/i386/coreboot/kernel.h
new file mode 100644
index 000000000..e69de29bb
diff --git a/include/grub/i386/ieee1275/kernel.h 
b/include/grub/i386/ieee1275/kernel.h
new file mode 100644
index 000000000..e69de29bb
diff --git a/include/grub/i386/xen/kernel.h b/include/grub/i386/xen/kernel.h
new file mode 100644
index 000000000..e69de29bb
diff --git a/include/grub/i386/xen_pvh/kernel.h 
b/include/grub/i386/xen_pvh/kernel.h
new file mode 100644
index 000000000..2b7b8a129
--- /dev/null
+++ b/include/grub/i386/xen_pvh/kernel.h
@@ -0,0 +1,30 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_KERNEL_MACHINE_HEADER
+#define GRUB_KERNEL_MACHINE_HEADER     1
+
+#ifndef ASM_FILE
+
+#define GRUB_KERNEL_USE_RSDP_ADDR      1
+
+extern grub_uint64_t EXPORT_VAR(grub_rsdp_addr);
+
+#endif /* ! ASM_FILE */
+
+#endif /* GRUB_KERNEL_MACHINE_HEADER */
diff --git a/include/grub/xen.h b/include/grub/xen.h
index c31cc10c7..91cb7cf81 100644
--- a/include/grub/xen.h
+++ b/include/grub/xen.h
@@ -95,6 +95,11 @@ typedef grub_uint64_t grub_xen_mfn_t;
 typedef grub_uint32_t grub_xen_mfn_t;
 #endif
 typedef unsigned int grub_xen_evtchn_t;
+
+#ifdef GRUB_MACHINE_XEN_PVH
+extern struct hvm_start_info *pvh_start_info;
+void grub_xen_setup_pvh (void);
+#endif
 #endif
 
 #endif
-- 
2.16.4