[PATCH] export -boot parameter as qemu_boot{0,1,2}

[Robert Millan <rmh@aybabtu.com>]

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This patch makes GRUB gather the -boot parameter from CMOS and
export it as a set of variables (qemu_boot{0,1,2}), which can
be observed in grub.cfg scripts.

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

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2009-06-27  Robert Millan  <rmh.grub@aybabtu.com>

	* kern/i386/coreboot/init.c (QEMU_CMOS_BOOT_DEVICE_01)
	(QEMU_CMOS_BOOT_DEVICE_2, QEMU_CMOS_BOOT_FLOPPY)
	(QEMU_CMOS_BOOT_HDD, QEMU_CMOS_BOOT_CDROM)
	(QEMU_CMOS_BOOT_NETWORK): New macros.
	[GRUB_MACHINE_QEMU] (grub_machine_init): Initialize
	`qemu_bootX' variables using the CMOS values corresponding
	to `-boot' parameter in QEMU command-line.

Index: kern/i386/coreboot/init.c
===================================================================
--- kern/i386/coreboot/init.c	(revision 2367)
+++ kern/i386/coreboot/init.c	(working copy)
@@ -36,6 +36,15 @@
 #include <grub/cpu/io.h>
 #include <grub/cpu/kernel.h>
 #include <grub/cpu/tsc.h>
+#include <grub/cpu/cmos.h>
+
+#define QEMU_CMOS_BOOT_DEVICE_01	0x3d
+#define QEMU_CMOS_BOOT_DEVICE_2		0x38
+
+#define QEMU_CMOS_BOOT_FLOPPY		0x01
+#define QEMU_CMOS_BOOT_HDD		0x02
+#define QEMU_CMOS_BOOT_CDROM		0x03
+#define QEMU_CMOS_BOOT_NETWORK		0x04
 
 #define GRUB_FLOPPY_REG_DIGITAL_OUTPUT		0x3f2
 
@@ -125,6 +134,45 @@ grub_machine_init (void)
   grub_machine_mmap_iterate (heap_init);
 
   grub_tsc_init ();
+
+#ifdef GRUB_MACHINE_QEMU
+  {
+    grub_uint8_t device[3];
+    unsigned int i, j;
+
+    device[0] = grub_cmos_read (QEMU_CMOS_BOOT_DEVICE_01) & 0x0f;
+    device[1] = grub_cmos_read (QEMU_CMOS_BOOT_DEVICE_01) >> 4;
+    device[2] = grub_cmos_read (QEMU_CMOS_BOOT_DEVICE_2) >> 4;
+
+    auto void qemu_boot_ata (int n, int ata);
+    void qemu_boot_ata (int n, int ata)
+      {
+	char ata_device[] = "ataX";
+	char qemu_boot[] = "qemu_bootX";
+
+	qemu_boot[9] = n + '0';
+	ata_device[3] = ata + '0';
+
+	grub_env_set (qemu_boot, ata_device);
+      }
+
+    j = 0;
+    for (i = 0; i < sizeof (device) / sizeof (device[0]); i++)
+      switch (device[i])
+	{
+	case QEMU_CMOS_BOOT_HDD:
+	  qemu_boot_ata (j++, 0);
+	  break;
+	case QEMU_CMOS_BOOT_CDROM:
+	  qemu_boot_ata (j++, 2);
+	  break;
+	case QEMU_CMOS_BOOT_FLOPPY:
+	case QEMU_CMOS_BOOT_NETWORK:
+	default:
+	  break;
+	}
+  }
+#endif
 }
 
 void