The magic is used to select between multiboot1 and multiboot2 boot
data registration. Multiboot2 implementation is deferred until later
patches and attempts to boot with multiboot2 will panic for the time
being.
---
i386/i386at/model_dep.c | 59 ++++++++++++++++++++++++++++++++++-------
1 file changed, 49 insertions(+), 10 deletions(-)
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c
index 3bb3ed08..8e96e5d7 100644
--- a/i386/i386at/model_dep.c
+++ b/i386/i386at/model_dep.c
@@ -41,6 +41,7 @@
#include <mach/vm_prot.h>
#include <mach/machine.h>
#include <mach/machine/multiboot.h>
+#include <mach/machine/multiboot2.h>
#include <mach/xen.h>
#include <kern/assert.h>
@@ -311,17 +312,13 @@ void db_reset_cpu(void)
#ifndef MACH_HYP
static void
-register_boot_data(const struct multiboot_raw_info *mbi)
+register_mb1_boot_data(const struct multiboot_raw_info *mbi)
{
struct multiboot_raw_module *mod;
struct elf_shdr *shdr;
unsigned long tmp;
unsigned int i;
- extern char _start[], _end[];
-
- biosmem_register_boot_data(_kvtophys(&_start), _kvtophys(&_end), FALSE);
-
/* cmdline and modules are moved to a safe place by i386at_init. */
if ((mbi->flags & MULTIBOOT_LOADER_CMDLINE) && (mbi->cmdline != 0)) {
@@ -372,14 +369,25 @@ register_boot_data(const struct multiboot_raw_info *mbi)
mbinfo_register_boot_data(mbi);
}
+static void
+register_mb2_boot_data(const struct multiboot2_raw_info *mb2_info)
+{
+ panic("Multiboot2 not implemented yet");
+}
+
#endif /* MACH_HYP */
/*
* Basic PC VM initialization.
* Turns on paging and changes the kernel segments to use high linear
addresses.
+ *
+ * mb2_info is the multiboot2 information structure supplied by the
+ * boot loader. If this is NULL then either multiboot1 or Xen boot is
+ * in effect and the global 'boot_info' supplies the boot information
+ * instead.
*/
static void
-i386at_init(void)
+i386at_init(const struct multiboot2_raw_info *mb2_info)
{
/*
* Initialize the PIC prior to any possible call to an spl.
@@ -400,7 +408,15 @@ i386at_init(void)
#ifdef MACH_HYP
biosmem_xen_bootstrap();
#else /* MACH_HYP */
- register_boot_data((struct multiboot_raw_info *) &boot_info);
+ extern char _start[], _end[];
+
+ biosmem_register_boot_data(_kvtophys(&_start), _kvtophys(&_end), FALSE);
+
+ if (mb2_info == NULL)
+ register_mb1_boot_data(&boot_info);
+ else
+ register_mb2_boot_data(mb2_info);
+
biosmem_bootstrap((struct multiboot_raw_info *) &boot_info);
#endif /* MACH_HYP */
@@ -523,12 +539,35 @@ void c_boot_entry(vm_offset_t bi)
void c_boot_entry(vm_offset_t bi, uint32_t magic)
#endif
{
+ const struct multiboot2_raw_info *mb2_info = NULL;
+
#if ENABLE_IMMEDIATE_CONSOLE
romputc = immc_romputc;
#endif /* ENABLE_IMMEDIATE_CONSOLE */
- /* Stash the boot_image_info pointer. */
- boot_info = *(typeof(boot_info)*)phystokv(bi);
+#ifndef MACH_XEN
+ if (magic == MULTIBOOT2_BOOTLOADER_MAGIC)
+ {
+ /* Mach exposes a copy of 'boot_info' via the "mbinfo"
+ device. A simple method of maintaining that interface
+ is to translate 'mb2_info' into 'boot_info' and capture
+ any multiboot2 specific information (eg. EFI)
+ separately. Thereafter 'mb2_info' can be
+ discarded. This translation cannot happen until after
+ memory bootstrapping which means that we cannot
+ immediately use 'boot_info'. */
+ mb2_info = (const struct multiboot2_raw_info *)phystokv(bi);
+ }
+ else if (magic != MULTIBOOT_LOADER_MAGIC)
+ {
+ panic("Invalid multiboot magic ");
+ }
+ else
+#endif
+ /* Stash the boot_image_info pointer for the XEN and
+ multiboot1 cases. */
+ boot_info = *(typeof(boot_info)*)phystokv(bi);
+
int cpu_type;
/* Before we do _anything_ else, print the hello message.
@@ -570,7 +609,7 @@ void c_boot_entry(vm_offset_t bi, uint32_t magic)
/*
* Do basic VM initialization
*/
- i386at_init();
+ i386at_init(mb2_info);
#if MACH_KDB
/*
--
2.47.3
