Merge branch 'devel'

[palacios.git] / kitten / arch / x86_64 / boot / bootsect.S

diff --git a/kitten/arch/x86_64/boot/bootsect.S b/kitten/arch/x86_64/boot/bootsect.S
new file mode 100644 (file)
index 0000000..d6ddeb8
--- /dev/null
+++ b/kitten/arch/x86_64/boot/bootsect.S
@@ -0,0 +1,96 @@
+/*
+ *     bootsect.S              Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ *     modified by Drew Eckhardt
+ *     modified by Bruce Evans (bde)
+ *     modified by Chris Noe (May 1999) (as86 -> gas)
+ *     gutted by H. Peter Anvin (Jan 2003)
+ *
+ * BIG FAT NOTE: We're in real mode using 64k segments.  Therefore segment
+ * addresses must be multiplied by 16 to obtain their respective linear
+ * addresses. To avoid confusion, linear addresses are written using leading
+ * hex while segment addresses are written as segment:offset.
+ *
+ */
+
+#include <arch/boot.h>
+
+SETUPSECTS     = 4                     /* default nr of setup-sectors */
+BOOTSEG                = 0x07C0                /* original address of boot-sector */
+INITSEG                = DEF_INITSEG           /* we move boot here - out of the way */
+SETUPSEG       = DEF_SETUPSEG          /* setup starts here */
+SYSSEG         = DEF_SYSSEG            /* system loaded at 0x10000 (65536) */
+SYSSIZE                = DEF_SYSSIZE           /* system size: # of 16-byte clicks */
+                                       /* to be loaded */
+ROOT_DEV       = 0                     /* ROOT_DEV is now written by "build" */
+SWAP_DEV       = 0                     /* SWAP_DEV is now written by "build" */
+
+#define SVGA_MODE 0
+
+#ifndef RAMDISK
+#define RAMDISK 0
+#endif
+
+#ifndef ROOT_RDONLY
+#define ROOT_RDONLY 1
+#endif
+
+.code16
+.text
+
+.global _start
+_start:
+
+       # Normalize the start address
+       jmpl    $BOOTSEG, $start2
+
+start2:
+       movw    %cs, %ax
+       movw    %ax, %ds
+       movw    %ax, %es
+       movw    %ax, %ss
+       movw    $0x7c00, %sp
+       sti
+       cld
+
+       movw    $bugger_off_msg, %si
+
+msg_loop:
+       lodsb
+       andb    %al, %al
+       jz      die
+       movb    $0xe, %ah
+       movw    $7, %bx
+       int     $0x10
+       jmp     msg_loop
+
+die:
+       # Allow the user to press a key, then reboot
+       xorw    %ax, %ax
+       int     $0x16
+       int     $0x19
+
+       # int 0x19 should never return.  In case it does anyway,
+       # invoke the BIOS reset code...
+       ljmp    $0xf000,$0xfff0
+
+
+bugger_off_msg:
+       .ascii  "Direct booting from floppy is no longer supported.\r\n"
+       .ascii  "Please use a boot loader program instead.\r\n"
+       .ascii  "\n"
+       .ascii  "Remove disk and press any key to reboot . . .\r\n"
+       .byte   0
+
+
+       # Kernel attributes; used by setup
+
+       .org 497
+setup_sects:   .byte SETUPSECTS
+root_flags:    .word ROOT_RDONLY
+syssize:       .word SYSSIZE
+swap_dev:      .word SWAP_DEV
+ram_size:      .word RAMDISK
+vid_mode:      .word SVGA_MODE
+root_dev:      .word ROOT_DEV
+boot_flag:     .word 0xAA55