forked from Imagelibrary/rtems
Added BSP specific start since it had become VERY complex to attempt
to share the start code across i386 BSPs.
This commit is contained in:
Joel Sherrill
@@ -13,4 +13,4 @@ include $(RTEMS_ROOT)/make/directory.cfg
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# wrapup is the one that actually builds and installs the library
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# from the individual .rel files built in other directories
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SUB_DIRS=include startup clock console shmsupp timer wrapup
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SUB_DIRS=include start startup clock console shmsupp timer wrapup
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57
c/src/lib/libbsp/i386/force386/start/Makefile.in
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57
c/src/lib/libbsp/i386/force386/start/Makefile.in
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@@ -0,0 +1,57 @@
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#
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# $Id$
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#
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@SET_MAKE@
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srcdir = @srcdir@
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VPATH = @srcdir@
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RTEMS_ROOT = @top_srcdir@
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PROJECT_ROOT = @PROJECT_ROOT@
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PGMS=${ARCH}/start.o
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# C source names, if any, go here -- minus the .c
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C_PIECES=
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C_FILES=$(C_PIECES:%=%.c)
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C_O_FILES=$(C_PIECES:%=${ARCH}/%.o)
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H_FILES=
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# Assembly source names, if any, go here -- minus the .s
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S_PIECES=start
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S_FILES=$(S_PIECES:%=%.s)
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S_O_FILES=$(S_FILES:%.s=${ARCH}/%.o)
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SRCS=$(C_FILES) $(H_FILES) $(S_FILES)
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OBJS=$(C_O_FILES) $(S_O_FILES)
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include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
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include $(RTEMS_ROOT)/make/leaf.cfg
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#
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# (OPTIONAL) Add local stuff here using +=
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#
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DEFINES +=
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CPPFLAGS +=
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CFLAGS +=
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LD_PATHS +=
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LD_LIBS +=
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LDFLAGS +=
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#
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# Add your list of files to delete here. The config files
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# already know how to delete some stuff, so you may want
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# to just run 'make clean' first to see what gets missed.
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# 'make clobber' already includes 'make clean'
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#
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CLEAN_ADDITIONS +=
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CLOBBER_ADDITIONS +=
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all: ${ARCH} $(SRCS) $(OBJS) $(PGM)
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$(INSTALL_VARIANT) -m 555 ${PGMS} ${PROJECT_RELEASE}/lib
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# Install the program(s), appending _g or _p as appropriate.
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# for include files, just use $(INSTALL)
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267
c/src/lib/libbsp/i386/force386/start/start.s
Normal file
267
c/src/lib/libbsp/i386/force386/start/start.s
Normal file
@@ -0,0 +1,267 @@
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/* start.s
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*
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* This file contains the entry point for the application.
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* The name of this entry point is compiler dependent.
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* It jumps to the BSP which is responsible for performing
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* all initialization.
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*
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*
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* COPYRIGHT (c) 1989-1998.
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* On-Line Applications Research Corporation (OAR).
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* Copyright assigned to U.S. Government, 1994.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* $Id$
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*/
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#include "asm.h"
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/*
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* A Descriptor table register has the following format
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*/
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.set DTR_LIMIT, 0 # offset of two byte limit
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.set DTR_BASE, 2 # offset of four byte base address
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.set DTR_SIZE, 6 # size of DTR register
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BEGIN_DATA
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EXTERN (Do_Load_IDT)
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EXTERN (Do_Load_GDT)
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END_DATA
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BEGIN_CODE
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PUBLIC (start) # GNU default entry point
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EXTERN (boot_card)
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EXTERN (load_segments)
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EXTERN (exit)
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SYM (start):
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nop
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cli # DISABLE INTERRUPTS!!!
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/*
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* Load the segment registers
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*
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* NOTE: Upon return, gs will contain the segment descriptor for
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* a segment which maps directly to all of physical memory.
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*/
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jmp SYM (_load_segments) # load board dependent segments
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/*
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* Set up the stack
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*/
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PUBLIC (_establish_stack)
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SYM (_establish_stack):
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movl $end,eax # eax = end of bss/start of heap
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addl $heap_size,eax # eax = end of heap
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movl eax,stack_start # Save for brk() routine
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addl $stack_size,eax # make room for stack
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andl $0xffffffc0,eax # align it on 16 byte boundary
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movl eax,esp # set stack pointer
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movl eax,ebp # set base pointer
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/*
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* Zero out the BSS segment
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*/
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SYM (zero_bss):
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cld # make direction flag count up
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movl $ SYM (end),ecx # find end of .bss
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movl $ SYM (_bss_start),edi # edi = beginning of .bss
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subl edi,ecx # ecx = size of .bss in bytes
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shrl ecx # size of .bss in longs
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shrl ecx
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xorl eax,eax # value to clear out memory
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repne # while ecx != 0
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stosl # clear a long in the bss
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/*
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* Copy the Global Descriptor Table to our space
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*/
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sgdt SYM (_Original_GDTR) # save original GDT
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movzwl SYM (_Original_GDTR)+DTR_LIMIT,ecx
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/* size of GDT in bytes; limit is */
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/* 8192 entries * 8 bytes per */
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/*
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* make ds:esi point to the original GDT
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*/
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movl SYM (_Original_GDTR)+DTR_BASE,esi
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push ds # save ds
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movw gs,ax
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movw ax,ds
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/*
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* make es:edi point to the new (our copy) GDT
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*/
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movl $ SYM (_Global_descriptor_table),edi
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rep
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movsb # copy the GDT (ds:esi -> es:edi)
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pop ds # restore ds
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/*
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* Build and load new contents of GDTR
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*/
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movw SYM (_Original_GDTR)+DTR_LIMIT,ecx # set new limit
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movw cx, SYM (_New_GDTR)+DTR_LIMIT
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push $ SYM (_Global_descriptor_table)
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push es
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call SYM (i386_Logical_to_physical)
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addl $6,esp
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movl eax, SYM (_New_GDTR)+DTR_BASE # set new base
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cmpb $0, SYM (_Do_Load_GDT) # Should the new GDT be loaded?
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je SYM (no_gdt_load) # NO, then branch
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lgdt SYM (_New_GDTR) # load the new GDT
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SYM (no_gdt_load):
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/*
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* Copy the Interrupt Descriptor Table to our space
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*/
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sidt SYM (_Original_IDTR) # save original IDT
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movzwl SYM (_Original_IDTR)+DTR_LIMIT,ecx
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/* size of IDT in bytes; limit is */
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/* 256 entries * 8 bytes per */
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/*
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* make ds:esi point to the original IDT
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*/
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movl SYM (_Original_IDTR)+DTR_BASE,esi
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push ds # save ds
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movw gs,ax
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movw ax,ds
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/*
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* make es:edi point to the new (our copy) IDT
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*/
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movl $ SYM (Interrupt_descriptor_table),edi
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rep
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movsb # copy the IDT (ds:esi -> es:edi)
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pop ds # restore ds
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/*
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* Build and load new contents of IDTR
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*/
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movw SYM (_Original_IDTR+DTR_LIMIT),ecx # set new limit
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movw cx,SYM (_New_IDTR)+DTR_LIMIT
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push $ SYM (Interrupt_descriptor_table)
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push es
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call SYM (i386_Logical_to_physical)
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addl $6,esp
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movl eax, SYM (_New_IDTR)+DTR_BASE # set new base
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cmpb $0, SYM (_Do_Load_IDT) # Should the new IDT be loaded?
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je SYM (no_idt_load) # NO, then branch
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lidt SYM (_New_IDTR) # load the new IDT
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SYM (no_idt_load):
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/*
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* Initialize the i387.
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*
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* Using the NO WAIT form of the instruction insures that
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* if it is not present the board will not lock up or get an
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* exception.
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*/
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fninit # MUST USE NO-WAIT FORM
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/*
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* Transfer control to User's Board Support Package
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*/
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pushl $0 # environp
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pushl $0 # argv
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pushl $0 # argc
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call SYM (boot_card)
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addl $12,esp
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/*
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* Clean up
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*/
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EXTERN (return_to_monitor)
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PUBLIC (Bsp_cleanup)
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SYM (Bsp_cleanup):
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cmpb $0, SYM (_Do_Load_IDT) # Was the new IDT loaded?
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je SYM (no_idt_restore) # NO, then branch
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lidt SYM (_Original_IDTR) # restore the new IDT
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SYM (no_idt_restore):
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cmpb $0, SYM (_Do_Load_GDT) # Was the new GDT loaded?
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je SYM (no_gdt_restore) # NO, then branch
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lgdt SYM (_Original_GDTR) # restore the new GDT
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SYM (no_gdt_restore):
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jmp SYM (_return_to_monitor)
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END_CODE
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BEGIN_DATA
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.align 2
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PUBLIC (start_frame)
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SYM (start_frame):
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.long 0
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PUBLIC (stack_start)
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SYM (stack_start):
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.long 0
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END_DATA
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BEGIN_BSS
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PUBLIC(heap_size)
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.set heap_size,0x2000
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PUBLIC(stack_size)
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.set stack_size,0x1000
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PUBLIC (Interrupt_descriptor_table)
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SYM (Interrupt_descriptor_table):
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.space 256*8
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PUBLIC (_Original_IDTR)
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SYM (_Original_IDTR):
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.space DTR_SIZE
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PUBLIC (_New_IDTR)
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SYM (_New_IDTR):
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.space DTR_SIZE
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PUBLIC (_Global_descriptor_table)
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SYM (_Global_descriptor_table):
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.space 8192*8
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PUBLIC (_Original_GDTR)
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SYM (_Original_GDTR):
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.space DTR_SIZE
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PUBLIC (_New_GDTR)
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SYM (_New_GDTR):
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.space DTR_SIZE
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PUBLIC (_Physical_base_of_ds)
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SYM (_Physical_base_of_ds):
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.space 4
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PUBLIC (_Physical_base_of_cs)
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SYM (_Physical_base_of_cs):
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.space 4
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END_BSS
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END
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