diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/syslib.h | 4 | ||||
| -rw-r--r-- | arch/x86/lib/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/lib/linux_start.S | 75 |
3 files changed, 80 insertions, 0 deletions
diff --git a/arch/x86/include/asm/syslib.h b/arch/x86/include/asm/syslib.h index a1316872c4..eebe1a99c9 100644 --- a/arch/x86/include/asm/syslib.h +++ b/arch/x86/include/asm/syslib.h @@ -27,3 +27,7 @@ extern int bios_disk_rw_int13_extensions(int, int, void*) __attribute__((regparm extern uint16_t bios_get_memsize(void); #endif + +#ifdef CONFIG_CMD_LINUX16 +extern void bios_start_linux(unsigned) __attribute__((regparm(1))); +#endif diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile index 013d369eaa..b67629f115 100644 --- a/arch/x86/lib/Makefile +++ b/arch/x86/lib/Makefile @@ -6,3 +6,4 @@ obj-y += gdt.o obj-$(CONFIG_X86_BIOS_BRINGUP) += memory16.o obj-$(CONFIG_X86_BIOS_BRINGUP) += traveler.o obj-$(CONFIG_X86_BIOS_BRINGUP) += bios_disk.o +obj-$(CONFIG_CMD_LINUX16) += linux_start.o diff --git a/arch/x86/lib/linux_start.S b/arch/x86/lib/linux_start.S new file mode 100644 index 0000000000..fac2510d1c --- /dev/null +++ b/arch/x86/lib/linux_start.S @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2009 Juergen Beisert, Pengutronix + * + * Mostly stolen from the GRUB2 project + * Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ + +/** + * @file + * @brief Start the Linux real mode setup code + * + * Note: These functions are running in flat and real mode. Due to some + * other restrictions these routines must running from an address + * space below 0x10000 + */ + +/* + * void bios_start_linux(unsigned segment) + * + */ +#ifndef DOXYGEN_SHOULD_SKIP_THIS + + .section .boot.text.bios_start_linux, "ax" + .code32 + .globl bios_start_linux + .type bios_start_linux, @function + + .extern prot_to_real + +bios_start_linux: + /* 'prot_to_real' eats our eax content */ + movl %eax, %ebx + addl $0x20, %eax + movw %ax, setup_seg + + call prot_to_real + + .code16 + + cli + /* all segment registers are using the same segment */ + movw %bx, %ss + movw %bx, %ds + movw %bx, %es + movw %bx, %fs + movw %bx, %gs + + /* stack for the setup code (end of heap) */ + movw $0x9000, %sp + + /* do an 'ljmp' and never return */ + .byte 0xea + .word 0 +setup_seg: + .word 0 + + .code32 + +#endif |