diff options
Diffstat (limited to 'sysdeps/standalone/i386/force_cpu386')
| -rw-r--r-- | sysdeps/standalone/i386/force_cpu386/Dist | 1 | ||||
| -rw-r--r-- | sysdeps/standalone/i386/force_cpu386/Makefile | 24 | ||||
| -rw-r--r-- | sysdeps/standalone/i386/force_cpu386/_exit.c | 47 | ||||
| -rw-r--r-- | sysdeps/standalone/i386/force_cpu386/brdinit.c | 44 | ||||
| -rw-r--r-- | sysdeps/standalone/i386/force_cpu386/console.c | 163 | ||||
| -rw-r--r-- | sysdeps/standalone/i386/force_cpu386/strtsupp.S | 89 | ||||
| -rw-r--r-- | sysdeps/standalone/i386/force_cpu386/target.ld | 59 |
7 files changed, 427 insertions, 0 deletions
diff --git a/sysdeps/standalone/i386/force_cpu386/Dist b/sysdeps/standalone/i386/force_cpu386/Dist new file mode 100644 index 0000000000..8b7b09e10a --- /dev/null +++ b/sysdeps/standalone/i386/force_cpu386/Dist @@ -0,0 +1 @@ +target.ld diff --git a/sysdeps/standalone/i386/force_cpu386/Makefile b/sysdeps/standalone/i386/force_cpu386/Makefile new file mode 100644 index 0000000000..8483724ee3 --- /dev/null +++ b/sysdeps/standalone/i386/force_cpu386/Makefile @@ -0,0 +1,24 @@ +# Copyright (C) 1994 Free Software Foundation, Inc. +# Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), +# On-Line Applications Research Corporation. + +# The GNU C Library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Library General Public License +# as published by the Free Software Foundation; either version 2 of +# the License, or (at your option) any later version. + +# The GNU C Library 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 +# Library General Public License for more details. + +# You should have received a copy of the GNU Library General Public +# License along with the GNU C Library; see the file COPYING.LIB. If +# not, write to the Free Software Foundation, Inc., 675 Mass Ave, +# Cambridge, MA 02139, USA. + +ifeq (bare,$(subdir)) +install-others += $(libdir)/force_cpu386.ld +$(libdir)/force_cpu386.ld: $(sysdep_dir)/standalone/i386/target.ld + $(do-install) +endif diff --git a/sysdeps/standalone/i386/force_cpu386/_exit.c b/sysdeps/standalone/i386/force_cpu386/_exit.c new file mode 100644 index 0000000000..011bb8bda9 --- /dev/null +++ b/sysdeps/standalone/i386/force_cpu386/_exit.c @@ -0,0 +1,47 @@ +/* Copyright (C) 1991 Free Software Foundation, Inc. + Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), + On-Line Applications Research Corporation. + +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <unistd.h> +#include <stdlib.h> + +/* This returns control to FORCEbug. */ + +void DEFUN_VOID(Bsp_cleanup); + +/* The function `_exit' should take a status argument and simply + terminate program execution, using the low-order 8 bits of the + given integer as status. */ + +__NORETURN void +DEFUN(_exit, (status), int status) +{ + /* status is ignored */ + Bsp_cleanup(); +} + +#ifdef HAVE_GNU_LD + +#include <gnu-stabs.h> + +stub_warning(_exit); + +#endif /* GNU stabs. */ diff --git a/sysdeps/standalone/i386/force_cpu386/brdinit.c b/sysdeps/standalone/i386/force_cpu386/brdinit.c new file mode 100644 index 0000000000..0d27218121 --- /dev/null +++ b/sysdeps/standalone/i386/force_cpu386/brdinit.c @@ -0,0 +1,44 @@ +/* Copyright (C) 1994 Free Software Foundation, Inc. + Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), + On-Line Applications Research Corporation. + +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <standalone.h> +#include "i386.h" + +/* _Board_Initialize() + +This routine initializes the FORCE CPU386 board. */ + +void DEFUN_VOID(_Console_Initialize); + +void +DEFUN_VOID(_Board_Initialize) +{ + /* + * FORCE documentation incorrectly states that the bus request + * level is initialized to 3. It is actually initialized by + * FORCEbug to 0. + */ + + outport_byte( 0x00, 0x3f ); /* resets VMEbus request level */ + + _Console_Initialize(); +} diff --git a/sysdeps/standalone/i386/force_cpu386/console.c b/sysdeps/standalone/i386/force_cpu386/console.c new file mode 100644 index 0000000000..5d56f768ea --- /dev/null +++ b/sysdeps/standalone/i386/force_cpu386/console.c @@ -0,0 +1,163 @@ +/* Copyright (C) 1994 Free Software Foundation, Inc. + Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), + On-Line Applications Research Corporation. + +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <standalone.h> +#include "i386.h" + +/* Console IO routines for a FORCE CPU386 board. */ + +/* Force CPU/386 specific IO addressing + * + * The following determines whether Port B or the Console should + * be used for console I/O. Setting ONE (and only ONE) of these to 1 + * enables I/O on that port. + * + * PORT A - DUSCC MC68562 Channel A (*** not supported here ***) + * PORT B - DUSCC MC68562 Channel B + * PORT C - MFP MC68901 Channel (*** FORCEbug console ***) + */ + +#define PORTB 1 /* use port b as console */ +#define PORTC 0 /* use console port as console */ + +#if ( PORTB == 1 ) +#define TX_STATUS 0x1b6 /* DUSCC General Status Register */ +#define RX_STATUS 0x1b6 /* DUSCC General Status Register */ +#define TX_BUFFER 0x1e0 /* DUSCC Transmitter Channel B */ +#define RX_BUFFER 0x1e8 /* DUSCC Receiver Channel B */ +#define Is_tx_ready( _status ) ( (_status) & 0x20 ) +#define Is_rx_ready( _status ) ( (_status) & 0x10 ) +#endif + +#if ( PORTC == 1 ) +#define TX_STATUS 0x12c /* MFP Transmit Status Register */ +#define RX_STATUS 0x12a /* MFP Receive Status Register */ +#define TX_BUFFER 0x12e /* MFP Transmitter Channel */ +#define RX_BUFFER 0x12e /* MFP Receiver Channel */ +#define Is_tx_ready( _status ) ( (_status) & 0x80 ) +#define Is_rx_ready( _status ) ( (_status) & 0x80 ) +#endif + +/* _Console_Initialize + +On the Force board the console require some initialization. */ + +void +DEFUN_VOID(_Console_Initialize) +{ + register unsigned8 ignored; + + /* FORCE technical support mentioned that it may be necessary to + read the DUSCC RX_BUFFER port four times to remove all junk. + This code is a little more paranoid. */ + + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); +} + +/* Miscellaneous support for console IO */ + +static inline int _Force386_is_rx_ready() +{ + register unsigned8 status; + + inport_byte( RX_STATUS, status ); + + if ( Is_rx_ready( status ) ) return 1; + else return 0; +} + +static inline int _Force386_is_tx_ready() +{ + register unsigned8 status; + + inport_byte( TX_STATUS, status ); + + if ( Is_tx_ready( status ) ) return 1; + else return 0; +} + + +static inline int _Force386_read_data() +{ + register unsigned8 ch; + +#if ( PORTB == 1 ) + /* Force example code resets the Channel B Receiver here. + * It appears to cause XON's to be lost. + */ + + /* outport_byte( RX_STATUS, 0x10 ); */ +#endif + + inport_byte( RX_BUFFER, ch ); + + return ch; +} + +/* _Console_Putc + +This routine transmits a character. It supports XON/XOFF flow control. */ + +#define XON 0x11 /* control-Q */ +#define XOFF 0x13 /* control-S */ + +int +DEFUN( _Console_Putc, (ch), char ch ) +{ + register unsigned8 inch; + + while ( !_Force386_is_tx_ready() ); + + while ( _Force386_is_rx_ready() == 1 ) { /* must be an XOFF */ + inch = _Force386_read_data(); + if ( inch == XOFF ) + do { + while ( _Force386_is_rx_ready() == 0 ); + inch = _Force386_read_data(); + } while ( inch != XON ); + } + + outport_byte( TX_BUFFER, ch ); + return( 0 ); +} + +/* _Console_Getc + +This routine reads a character from the UART and returns it. */ + +int +DEFUN( _Console_Getc, (poll), int poll ) +{ + if ( poll ) { + if ( !_Force386_is_rx_ready() ) + return -1; + else + return _Force386_read_data(); + } else { + while ( !_Force386_is_rx_ready() ); + return _Force386_read_data(); + } +} diff --git a/sysdeps/standalone/i386/force_cpu386/strtsupp.S b/sysdeps/standalone/i386/force_cpu386/strtsupp.S new file mode 100644 index 0000000000..6b78a8c343 --- /dev/null +++ b/sysdeps/standalone/i386/force_cpu386/strtsupp.S @@ -0,0 +1,89 @@ +/* Copyright (C) 1994 Free Software Foundation, Inc. + Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), + On-Line Applications Research Corporation. + +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* This file assists the board independent startup code by + * loading the proper segment register values. The values + * loaded are dependent on the FORCEBUG. + * + * NOTE: No stack has been established when this routine + * is invoked. It returns by jumping back to the start 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,_segreg) \ + movw $_value##,%ax ; \ + movw %ax,##_segreg + + + .global _load_segments + + .global _establish_stack + +_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 _establish_stack # return to the bsp entry code + + .global _return_to_monitor +_return_to_monitor: + + movb $0,%al + int $0x20 # restart FORCEbug + jmp start # FORCEbug does not reset PC + + .data + + .global _Do_Load_IDT +_Do_Load_IDT: .byte 1 + + .global _Do_Load_GDT +_Do_Load_GDT: .byte 0 + diff --git a/sysdeps/standalone/i386/force_cpu386/target.ld b/sysdeps/standalone/i386/force_cpu386/target.ld new file mode 100644 index 0000000000..056da10d55 --- /dev/null +++ b/sysdeps/standalone/i386/force_cpu386/target.ld @@ -0,0 +1,59 @@ +/* Copyright (C) 1994 Free Software Foundation, Inc. + Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), + On-Line Applications Research Corporation. + +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* This file contains directives for the GNU linker which are specific +to the FORCE CPU386 board. */ + +MEMORY + { + ram : org = 0x0, l = 1M + } + +/* This value is also when the space is allocated. If you change +this one, change the other one!!! */ + +heap_size = 0x20000; + +SECTIONS +{ + .text 0x0 : + { + _text_start = ABSOLUTE(.) ; + *(.text) + _etext = ALIGN( 0x10 ) ; + } + .data ADDR( .text ) + SIZEOF( .text ): + { + _data_start = . ; + *(.data) + _edata = ALIGN( 0x10 ) ; + } + .bss ADDR( .data ) + SIZEOF( .data ): + { + _bss_start = . ; + *(.bss) + *(COMMON) + heap_memory = .; + . += 0x20000; + _end = . ; + __end = . ; + } +} |