[PATCH v7 07/38] x86/boot: add start and size fields to struct boot_module

["Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>]

This commit introduces the start and size fields to struct boot_module and
assigns their value during boot_info construction.

The EFI entry point is a special case, as the EFI file loading boot service may
load a file beyond the 4G barrier. As a result, to make the address fit in the
32bit integer used by the MB1 module_t structure, the frame number is stored in
mod_start and size in mod_end. Until the EFI entry point is enlightened to work
with boot_info and boot_module, multiboot_fill_boot_info will handle the
alternate values in mod_start and mod_end when EFI is detected.

Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
---
Changes since v6:
- put the efi conversion for mod_start and mod_end back along with check
- dropped unnecessary cast
- updated the population of start and size fields to take into account efi

Changes since v5:
- switched EFI population of mod_start/mod_end to addresses
---
 xen/arch/x86/include/asm/bootinfo.h |  3 +++
 xen/arch/x86/setup.c                | 15 +++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/xen/arch/x86/include/asm/bootinfo.h 
b/xen/arch/x86/include/asm/bootinfo.h
index e8fba66eedc5..dbd22db3d063 100644
--- a/xen/arch/x86/include/asm/bootinfo.h
+++ b/xen/arch/x86/include/asm/bootinfo.h
@@ -46,6 +46,9 @@ struct boot_module {
      *   relocated: indicates module has been relocated in memory.
      */
     bool relocated:1;
+
+    paddr_t start;
+    size_t size;
 };
 
 /*
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 17f74384b5c1..2e87aa314389 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -315,10 +315,25 @@ static struct boot_info *__init 
multiboot_fill_boot_info(unsigned long mbi_p)
      * reserved for Xen.
      */
     for ( i = 0; i < MAX_NR_BOOTMODS && i < bi->nr_modules; i++ )
+    {
         bi->mods[i].mod = &mods[i];
 
+        if ( !efi_enabled(EFI_LOADER) )
+        {
+            bi->mods[i].start = mods[i].mod_start;
+            bi->mods[i].size = mods[i].mod_end - mods[i].mod_start;
+        }
+        else
+        {
+            bi->mods[i].start = pfn_to_paddr(mods[i].mod_start);
+            bi->mods[i].size = mods[i].mod_end;
+        }
+    }
+
     /* Variable 'i' should be one entry past the last module. */
     bi->mods[i].mod = &mods[bi->nr_modules];
+    bi->mods[i].start = mods[i].mod_start;
+    bi->mods[i].size = mods[i].mod_end - mods[i].mod_start;
     bi->mods[i].type = BOOTMOD_XEN;
 
     return bi;
-- 
2.30.2