Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 84 insertions, 0 deletions

diff --git a/Documentation/i386/zero-page.txt b/Documentation/i386/zero-page.txt
new file mode 100644
index 000000000000..67c053a099ed
--- /dev/null
+++ b/Documentation/i386/zero-page.txt
@@ -0,0 +1,84 @@
+Summary of boot_params layout (kernel point of view)
+     ( collected by Hans Lermen and Martin Mares )
+ 
+The contents of boot_params are used to pass parameters from the
+16-bit realmode code of the kernel to the 32-bit part. References/settings
+to it mainly are in:
+
+  arch/i386/boot/setup.S
+  arch/i386/boot/video.S
+  arch/i386/kernel/head.S
+  arch/i386/kernel/setup.c
+ 
+
+Offset  Type            Description
+------  ----            -----------
+    0   32 bytes        struct screen_info, SCREEN_INFO
+                        ATTENTION, overlaps the following !!!
+    2   unsigned short  EXT_MEM_K, extended memory size in Kb (from int 0x15)
+ 0x20   unsigned short  CL_MAGIC, commandline magic number (=0xA33F)
+ 0x22   unsigned short  CL_OFFSET, commandline offset
+                        Address of commandline is calculated:
+                          0x90000 + contents of CL_OFFSET
+                        (only taken, when CL_MAGIC = 0xA33F)
+ 0x40   20 bytes        struct apm_bios_info, APM_BIOS_INFO
+ 0x60   16 bytes        Intel SpeedStep (IST) BIOS support information
+ 0x80   16 bytes        hd0-disk-parameter from intvector 0x41
+ 0x90   16 bytes        hd1-disk-parameter from intvector 0x46
+
+ 0xa0   16 bytes        System description table truncated to 16 bytes.
+                        ( struct sys_desc_table_struct )
+ 0xb0 - 0x13f           Free. Add more parameters here if you really need them.
+ 0x140- 0x1be           EDID_INFO Video mode setup
+
+0x1c4   unsigned long   EFI system table pointer
+0x1c8   unsigned long   EFI memory descriptor size
+0x1cc   unsigned long   EFI memory descriptor version
+0x1d0   unsigned long   EFI memory descriptor map pointer
+0x1d4   unsigned long   EFI memory descriptor map size
+0x1e0   unsigned long   ALT_MEM_K, alternative mem check, in Kb
+0x1e8   char            number of entries in E820MAP (below)
+0x1e9   unsigned char   number of entries in EDDBUF (below)
+0x1ea   unsigned char   number of entries in EDD_MBR_SIG_BUFFER (below)
+0x1f1   char            size of setup.S, number of sectors
+0x1f2   unsigned short  MOUNT_ROOT_RDONLY (if !=0)
+0x1f4   unsigned short  size of compressed kernel-part in the
+                        (b)zImage-file (in 16 byte units, rounded up)
+0x1f6   unsigned short  swap_dev (unused AFAIK)
+0x1f8   unsigned short  RAMDISK_FLAGS
+0x1fa   unsigned short  VGA-Mode (old one)
+0x1fc   unsigned short  ORIG_ROOT_DEV (high=Major, low=minor)
+0x1ff   char            AUX_DEVICE_INFO
+
+0x200   short jump to start of setup code aka "reserved" field.
+0x202   4 bytes         Signature for SETUP-header, ="HdrS"
+0x206   unsigned short  Version number of header format
+                        Current version is 0x0201...
+0x208   8 bytes         (used by setup.S for communication with boot loaders,
+                         look there)
+0x210   char            LOADER_TYPE, = 0, old one
+                        else it is set by the loader:
+                        0xTV: T=0 for LILO
+                                1 for Loadlin
+                                2 for bootsect-loader
+                                3 for SYSLINUX
+                                4 for ETHERBOOT
+                                V = version
+0x211   char            loadflags:
+                        bit0 = 1: kernel is loaded high (bzImage)
+                        bit7 = 1: Heap and pointer (see below) set by boot
+                                  loader.
+0x212   unsigned short  (setup.S)
+0x214   unsigned long   KERNEL_START, where the loader started the kernel
+0x218   unsigned long   INITRD_START, address of loaded ramdisk image
+0x21c   unsigned long   INITRD_SIZE, size in bytes of ramdisk image
+0x220   4 bytes         (setup.S)
+0x224   unsigned short  setup.S heap end pointer
+0x226   unsigned short  zero_pad
+0x228   unsigned long   cmd_line_ptr
+0x22c   unsigned long   ramdisk_max
+0x230   16 bytes        trampoline
+0x290 - 0x2cf           EDD_MBR_SIG_BUFFER (edd.S)
+0x2d0 - 0x600           E820MAP
+0x600 - 0x7ff           EDDBUF (edd.S) for disk signature read sector
+0x600 - 0x7eb           EDDBUF (edd.S) for edd data