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Diffstat (limited to 'c/src/lib/libbsp/i386/pc386/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/i386/pc386/start/start.S | 345 |
1 files changed, 0 insertions, 345 deletions
diff --git a/c/src/lib/libbsp/i386/pc386/start/start.S b/c/src/lib/libbsp/i386/pc386/start/start.S deleted file mode 100644 index 51cd4711f0..0000000000 --- a/c/src/lib/libbsp/i386/pc386/start/start.S +++ /dev/null @@ -1,345 +0,0 @@ -/*-------------------------------------------------------------------------+ -| start.s v1.1 - PC386 BSP - 1997/08/07 -+--------------------------------------------------------------------------+ -| This file contains the entry point for the application. -| The name of this entry point is compiler dependent. -| It jumps to the BSP which is responsible for performing all initialization. -+--------------------------------------------------------------------------+ -| (C) Copyright 1997 - -| - NavIST Group - Real-Time Distributed Systems and Industrial Automation -| -| http://pandora.ist.utl.pt -| -| Instituto Superior Tecnico * Lisboa * PORTUGAL -+--------------------------------------------------------------------------+ -| Modified the 20/05/1998 by valette@crf.canon.fr in order to give a working -| example of eraly stage debugging via the DEBUG_EARLY_START define. -+--------------------------------------------------------------------------+ -| Disclaimer: -| -| This file is provided "AS IS" without warranty of any kind, either -| expressed or implied. -+--------------------------------------------------------------------------+ -| This code is based on an earlier generation RTEMS i386 start.s and the -| following copyright applies: -| -| ************************************************************************** -| * COPYRIGHT (c) 1989-2012. -| * On-Line Applications Research Corporation (OAR). -| * -| * The license and distribution terms for this file may be -| * found in the file LICENSE in this distribution or at -| * http://www.rtems.org/license/LICENSE. -| ************************************************************************** -+--------------------------------------------------------------------------*/ - -/* - * The most trivial start.s possible. It does not know anything - * about system it is running on, so it will jump to appropriate - * place in BSP specific place to do things it knows nothing about - */ - -#include <rtems/asm.h> -#include <rtems/score/cpu.h> -#include <bspopts.h> - -/*----------------------------------------------------------------------------+ -| Size of heap and stack: -+----------------------------------------------------------------------------*/ - -#ifndef CPU_STACK_ALIGNMENT -#error "Missing header ? CPU_STACK_ALIGNMENT NOT DEFINED" -#endif - -.set STACK_SIZE, 0x1000 - -/*----------------------------------------------------------------------------+ -| CODE section -+----------------------------------------------------------------------------*/ - -BEGIN_CODE - - PUBLIC (start) # GNU default entry point - - EXTERN (boot_card) -#if USE_VBE_RM - EXTERN (vesa_realmode_bootup_init) -#endif - EXTERN (_load_segments) - EXTERN (_return_to_monitor) - EXTERN (_IBMPC_initVideo) - EXTERN (debugPollingGetChar) - EXTERN (checkCPUtypeSetCr0) - EXTERN (printk) -#ifdef __SSE__ - EXTERN (x86_capability) -#ifdef __SSE3__ - EXTERN (x86_capability_x) -#endif -#endif - -/* - * In case this crashes on your machine and this is not due - * to video mode set by the loader, you may try to define - * the following variable: - */ -/* #define DEBUG_EARLY_START */ - -SYM (start): - /* - * When things are really, REALLY!, bad -- turn on the speaker and - * lock up. This shows whether or not we make it to a certain - * location. - */ -#if 0 - inb $0x61, al - orb $0x03, al - outb al, $0x61 # enable the speaker -speakl: jmp speakl # and SPIN!!! -#endif - - nop - cli # DISABLE INTERRUPTS!!! - cld - - /* Save multiboot info if we detect a multiboot loader */ - cmp $0x2badb002,eax - jne 2f - - /* We have multiboot info; let's hope DS and ES are OK... */ - movl ebx, SYM(_boot_multiboot_info_p) - /* Check for memory size info and save */ - movl ebx, esi - movl (esi), eax - movl eax, ebx - movl $SYM(_boot_multiboot_info), edi - /* save flags, always present */ - movsd - /* flag 1 is memory */ - and $1, eax - je 1f - movl $2, ecx - rep movsd - /* flag 2 is the command line */ -1: movl ebx, eax - and $4, eax - je 3f - movl (_boot_multiboot_info_p), eax - movl 16(eax), esi - movl $255, ecx -2: movzbl (esi), eax - test al, al - je 3f - movb al, (edi) - inc edi - inc esi - dec ecx - je 3f - jmp 2b -3: xor al, al - movb al, (edi) -#ifdef DEBUG_EARLY_START - /* - * Must get video attribute to have a working printk. - * Note that the following code assume we already have - * valid segments and a stack. It should be true for - * any loader starting RTEMS in protected mode (or - * at least I hope so : -)). - */ - call _IBMPC_initVideo - /* - * try printk and a getchar in polling mode ASAP - */ - movl $welcome_msg, 0(esp) - call printk - addl $4, esp - - /* call debugPollingGetChar */ - -#endif - -/*----------------------------------------------------------------------------+ -| Load the segment registers (this is done by the board's BSP) and perform any -| other board specific initialization procedures, this piece of code -| does not know anything about -| -| NOTE: Upon return, gs will contain the segment descriptor for a segment which -| maps directly to all of physical memory. -+----------------------------------------------------------------------------*/ - - jmp SYM (_load_segments) # load board dependent segments - -/*----------------------------------------------------------------------------+ -| Set up the stack -+----------------------------------------------------------------------------*/ - - PUBLIC (_establish_stack) -SYM (_establish_stack): - - movl $_end, eax # eax = end of bss/start of heap - addl $STACK_SIZE, eax # make room for stack - subl $4, eax # reserve room for arg to 'boot_card' - andl $ - CPU_STACK_ALIGNMENT, eax # align SP on CPU_STACK_ALIGNMENT boundary - movl eax, esp # set stack pointer - movl eax, ebp # set base pointer - -/*----------------------------------------------------------------------------+ -| Zero out the BSS segment -+----------------------------------------------------------------------------*/ - -SYM (zero_bss): - cld # make direction flag count up - movl $ SYM (_end), ecx # find end of .bss - movl $ SYM (__bss_start), edi # edi = beginning of .bss - subl edi, ecx # ecx = size of .bss in bytes - shrl ecx # size of .bss in longs - shrl ecx - xorl eax, eax # value to clear out memory - repne # while ecx != 0 - stosl # clear a long in the bss - -#if BSP_ENABLE_VGA -/*-------------------------------------------------------------------+ -| Initialize the video because zero_bss has cleared initVideo parameters -| if it was called earlier -| So from now we can use printk -+-------------------------------------------------------------------*/ - call _IBMPC_initVideo - -#if USE_VBE_RM - call vesa_realmode_bootup_init -#endif -#endif - -/*---------------------------------------------------------------------+ -| Check CPU type. Enable Cache and init coprocessor if needed. -+---------------------------------------------------------------------*/ - call checkCPUtypeSetCr0 - -#ifdef __SSE__ - call SYM(enable_sse) -#endif - -/*---------------------------------------------------------------------+ -| Transfer control to User's Board Support Package -| Note: at the top we reserved space for the argument -| so that -| initial_esp = ( TOS - 4 ) & ~(CPU_STACK_ALIGNMENT-1) -| this ensures that -| 1) esp is now aligned -| 2) there is space for the cmdline pointer which we just -| may store at *(esp) -+---------------------------------------------------------------------*/ - - movl $SYM(_boot_multiboot_cmdline), (esp) - call SYM (boot_card) - - cli # stops interrupts from being processed after hlt! - hlt # shutdown - -#ifdef __SSE__ -/*--------------------------------------------------------------------+ - | Enable SSE; we really only care about fxsave/fxrstor and leave - | The only feature *we* (as an OS) use is fxsave/fxrstor. - | But as a courtesy we make sure we don't execute on hardware - | that doesn't support features possibly used by the compiler. -+---------------------------------------------------------------------*/ - PUBLIC (enable_sse) -SYM(enable_sse): - movl SYM (x86_capability), eax - testl $0x01000000, eax - jne 1f - movl $SYM (no_fxsave_msg), 0(esp) - jmp SYM(_sse_panic) -1: - testl $0x02000000, eax - jne 1f - movl $SYM (no_sse_msg), 0(esp) - jmp SYM(_sse_panic) -1: -#ifdef __SSE2__ - testl $0x04000000, eax - jne 1f - movl $SYM (no_sse2_msg), 0(esp) - jmp SYM(_sse_panic) -1: -#endif -#ifdef __SSE3__ - movl SYM (x86_capability_x), eax - testl $1, eax - jne 1f - movl $SYM (no_sse3_msg), 0(esp) - jmp SYM(_sse_panic) -1: -#endif - mov cr4, eax # OK to enable now - or $0x600, eax - mov eax, cr4 - ret - -SYM(_sse_panic): - call SYM(printk) -1: hlt - jmp 1b -#endif - -END_CODE - -BEGIN_DATA - PUBLIC(_boot_multiboot_info_p) -SYM(_boot_multiboot_info_p): - .long 0 - - PUBLIC(_boot_multiboot_info) - PUBLIC(_boot_multiboot_flags) - PUBLIC(_boot_multiboot_memory) - PUBLIC(_boot_multiboot_cmdline) -SYM(_boot_multiboot_info): -SYM(_boot_multiboot_flags): - .long 0 /* flags */ -SYM(_boot_multiboot_memory): - .long 0 /* mem_lower */ - .long 0 /* mem_upper */ -SYM(_boot_multiboot_cmdline): - .rept 256 /* cmd line */ - .byte 0 - .endr - - PUBLIC(_stack_size) -SYM(_stack_size): - .long STACK_SIZE - -#ifdef DEBUG_EARLY_START - - PUBLIC (welcome_msg) -SYM (welcome_msg) : - .string "Ready to debug RTEMS ?\nEnter <CR>\n" - - PUBLIC (hex_msg) -SYM (hex_msg) : - .string "0x%x\n" - - PUBLIC (made_it_msg) -SYM (made_it_msg) : - .string "made it to %d\n" - -#endif - -#ifdef __SSE__ -SYM (no_fxsave_msg) : - .string "PANIC: compiled for SSE but CPU seems to have no FXSAVE/FXRSTOR support (which I need)\n" -SYM (no_sse_msg) : - .string "PANIC: compiled for SSE but your CPU seems to have no SSE support\n" -#ifdef __SSE2__ -SYM (no_sse2_msg) : - .string "PANIC: compiled for SSE2 but your CPU seems to have no SSE2 support\n" -#endif -#ifdef __SSE3__ -SYM (no_sse3_msg) : - .string "PANIC: compiled for SSE3 but your CPU seems to have no SSE3 support\n" -#endif -#endif - -END_DATA - -END |