diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/force386/startup/ldsegs.s')
| -rw-r--r-- | c/src/lib/libbsp/i386/force386/startup/ldsegs.s | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/c/src/lib/libbsp/i386/force386/startup/ldsegs.s b/c/src/lib/libbsp/i386/force386/startup/ldsegs.s deleted file mode 100644 index 063c1eccc7..0000000000 --- a/c/src/lib/libbsp/i386/force386/startup/ldsegs.s +++ /dev/null @@ -1,86 +0,0 @@ -/* _load_segments - * - * This file assists the board independent startup code by - * loading the proper segment register values. The values - * loaded are board dependent. - * - * NOTE: No stack has been established when this routine - * is invoked. It returns by jumping back to bspentry. - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - -#include "asm.h" - -BEGIN_CODE - -/* - * FORCEBUG loads us into a virtual address space which - * really starts at PHYSICAL_ADDRESS_BASE. - */ - -.set PHYSICAL_ADDRESS_BASE, 0x00002000 - -/* - * At reset time, FORCEBUG normally has the segment selectors preloaded. - * If a human resets the instruction pointer, this will not have occurred. - * However, no guarantee can be made of the other registers if cs:ip was - * modified to restart the program. Because of this, the BSP reloads all - * segment registers (except cs) with the values they have following - * a reset. - */ - - -.set RESET_SS, 0x40 # initial value of stack segment register -.set RESET_DS, 0x40 # initial value of data segment register -.set RESET_ES, 0x40 # initial value of extra segment register -.set RESET_FS, 0x40 # initial value of "f" segment register -.set RESET_GS, 0x30 # initial value of "g" segment register - - -#define LOAD_SEGMENTS(_value,_segment) \ - movw $ ## _value, ax ; \ - movw _segment, ax - - EXTERN (establish_stack) - - PUBLIC (_load_segments) -SYM (_load_segments): - LOAD_SEGMENTS( RESET_SS, ss ) - LOAD_SEGMENTS( RESET_DS, ds ) - LOAD_SEGMENTS( RESET_ES, es ) - LOAD_SEGMENTS( RESET_FS, fs ) - LOAD_SEGMENTS( RESET_GS, gs ) - - jmp SYM (_establish_stack) # return to the bsp entry code - - PUBLIC (_return_to_monitor) -SYM (_return_to_monitor): - - call SYM (Clock_exit) - movb $0,al - int $0x20 # restart FORCEbug - jmp SYM (start) # FORCEbug does not reset PC - -END_CODE - -BEGIN_DATA - - PUBLIC (_Do_Load_IDT) -SYM (_Do_Load_IDT): - .byte 1 - - PUBLIC (_Do_Load_GDT) -SYM (_Do_Load_GDT): - .byte 0 - -END_DATA -END |