diff options
Diffstat (limited to 'lib_nios')
| -rw-r--r-- | lib_nios/Makefile | 44 | ||||
| -rw-r--r-- | lib_nios/board.c | 166 | ||||
| -rw-r--r-- | lib_nios/cache.c | 32 | ||||
| -rw-r--r-- | lib_nios/divmod.c | 101 | ||||
| -rw-r--r-- | lib_nios/math.h | 16 | ||||
| -rw-r--r-- | lib_nios/mult.c | 56 | ||||
| -rw-r--r-- | lib_nios/nios_linux.c | 34 | ||||
| -rw-r--r-- | lib_nios/time.c | 37 |
8 files changed, 486 insertions, 0 deletions
diff --git a/lib_nios/Makefile b/lib_nios/Makefile new file mode 100644 index 0000000..eff46db --- /dev/null +++ b/lib_nios/Makefile @@ -0,0 +1,44 @@ +# +# (C) Copyright 2000 +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# See file CREDITS for list of people who contributed to this +# project. +# +# 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 +# + +include $(TOPDIR)/config.mk + +LIB = lib$(ARCH).a + +AOBJS = + +COBJS = board.o cache.o divmod.o nios_linux.o mult.o time.o + +OBJS = $(AOBJS) $(COBJS) + +$(LIB): .depend $(OBJS) + $(AR) crv $@ $(OBJS) + +######################################################################### + +.depend: Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c) + $(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@ + +sinclude .depend + +######################################################################### diff --git a/lib_nios/board.c b/lib_nios/board.c new file mode 100644 index 0000000..c81c001 --- /dev/null +++ b/lib_nios/board.c @@ -0,0 +1,166 @@ +/* + * (C) Copyright 2003, Psyent Corporation <www.psyent.com> + * Scott McNutt <smcnutt@psyent.com> + * + * (C) Copyright 2000-2002 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +#include <common.h> +#include <devices.h> +#include <watchdog.h> + + +/* + * All attempts to come up with a "common" initialization sequence + * that works for all boards and architectures failed: some of the + * requirements are just _too_ different. To get rid of the resulting + * mess of board dependend #ifdef'ed code we now make the whole + * initialization sequence configurable to the user. + * + * The requirements for any new initalization function is simple: it + * receives a pointer to the "global data" structure as it's only + * argument, and returns an integer return code, where 0 means + * "continue" and != 0 means "fatal error, hang the system". + */ + + +extern void malloc_bin_reloc (void); +typedef int (init_fnc_t) (void); +extern unsigned _vectors[]; + +/* + * Begin and End of memory area for malloc(), and current "brk" + */ +static ulong mem_malloc_start = 0; +static ulong mem_malloc_end = 0; +static ulong mem_malloc_brk = 0; + +/* + * The Malloc area is immediately below the monitor copy in RAM + */ +static void mem_malloc_init (void) +{ + mem_malloc_start = CFG_MALLOC_BASE; + mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN; + mem_malloc_brk = mem_malloc_start; + memset ((void *) mem_malloc_start, + 0, + mem_malloc_end - mem_malloc_start); +} + +void *sbrk (ptrdiff_t increment) +{ + ulong old = mem_malloc_brk; + ulong new = old + increment; + + if ((new < mem_malloc_start) || (new > mem_malloc_end)) { + return (NULL); + } + mem_malloc_brk = new; + return ((void *) old); +} + + +/************************************************************************ + * Initialization sequence * + ***********************************************************************/ + +init_fnc_t *init_sequence[] = { + +#if defined(CONFIG_BOARD_PRE_INIT) + board_pre_init, /* Call board-specific init code early.*/ +#endif + + env_init, + serial_init, + console_init_f, + display_options, + checkcpu, + checkboard, + NULL, /* Terminate this list */ +}; + + +/***********************************************************************/ +void board_init (void) +{ + DECLARE_GLOBAL_DATA_PTR; + + bd_t *bd; + init_fnc_t **init_fnc_ptr; + + /* Pointer is writable since we allocated a register for it. + * Nios treats CFG_GBL_DATA_OFFSET as an address. + */ + gd = (gd_t *)CFG_GBL_DATA_OFFSET; + memset( gd, 0, CFG_GBL_DATA_SIZE ); + + /* Copy exception vectors to the correct location. + */ + memcpy( (void *)CFG_VECT_BASE, _vectors, 256 ); + + gd->bd = (bd_t *)(gd+1); /* At end of global data */ + gd->baudrate = CONFIG_BAUDRATE; + gd->cpu_clk = CONFIG_SYS_CLK_FREQ; + + bd = gd->bd; + bd->bi_memstart = CFG_SDRAM_BASE; + bd->bi_memsize = CFG_SDRAM_SIZE; + bd->bi_flashstart = CFG_FLASH_BASE; + bd->bi_sramstart= CFG_SRAM_BASE; + bd->bi_sramsize = CFG_SRAM_SIZE; + bd->bi_baudrate = CONFIG_BAUDRATE; + + for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) { + if ((*init_fnc_ptr) () != 0) { + hang (); + } + } + + bd->bi_flashsize = flash_init(); + + mem_malloc_init(); + malloc_bin_reloc(); + env_relocate(); + + devices_init(); + jumptable_init(); + console_init_r(); + /* + */ + + interrupt_init (); + /* main_loop */ + for (;;) { + WATCHDOG_RESET (); + main_loop (); + } +} + + +/***********************************************************************/ + +void hang (void) +{ + puts("### ERROR ### Please reset board ###\n"); + for (;;); +} diff --git a/lib_nios/cache.c b/lib_nios/cache.c new file mode 100644 index 0000000..87dbab1 --- /dev/null +++ b/lib_nios/cache.c @@ -0,0 +1,32 @@ +/* + * (C) Copyright 2003, Psyent Corporation <www.psyent.com> + * Scott McNutt <smcnutt@psyent.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +#include <common.h> + + +void flush_cache (ulong addr, ulong size) +{ + /* Nios cache is write-thru -- nothing to do here. + */ + return; +} diff --git a/lib_nios/divmod.c b/lib_nios/divmod.c new file mode 100644 index 0000000..3c7e71e --- /dev/null +++ b/lib_nios/divmod.c @@ -0,0 +1,101 @@ +/* + * This file is part of GNU CC. + * + * GNU CC 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, or (at your + * option) any later version. + * + * GNU CC 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 GNU CC; see the file COPYING. If not, write + * to the Free Software Foundation, 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + + +#include "math.h" + +USItype udivmodsi4 (USItype num, USItype den, word_type modwanted) +{ + USItype bit = 1; + USItype res = 0; + + while (den < num && bit && !(den & (1L << 31))) { + den <<= 1; + bit <<= 1; + } + while (bit) { + if (num >= den) { + num -= den; + res |= bit; + } + bit >>= 1; + den >>= 1; + } + if (modwanted) + return num; + return res; +} + + +SItype __divsi3 (SItype a, SItype b) +{ + word_type neg = 0; + SItype res; + + if (a < 0) { + a = -a; + neg = !neg; + } + + if (b < 0) { + b = -b; + neg = !neg; + } + + res = udivmodsi4 (a, b, 0); + + if (neg) + res = -res; + + return res; +} + + +SItype __modsi3 (SItype a, SItype b) +{ + word_type neg = 0; + SItype res; + + if (a < 0) { + a = -a; + neg = 1; + } + + if (b < 0) + b = -b; + + res = udivmodsi4 (a, b, 1); + + if (neg) + res = -res; + + return res; +} + + +SItype __udivsi3 (SItype a, SItype b) +{ + return udivmodsi4 (a, b, 0); +} + + +SItype __umodsi3 (SItype a, SItype b) +{ + return udivmodsi4 (a, b, 1); +} diff --git a/lib_nios/math.h b/lib_nios/math.h new file mode 100644 index 0000000..ccffbbc --- /dev/null +++ b/lib_nios/math.h @@ -0,0 +1,16 @@ +#define BITS_PER_UNIT 8 + +typedef int HItype __attribute__ ((mode (HI))); +typedef unsigned int UHItype __attribute__ ((mode (HI))); + +typedef int SItype __attribute__ ((mode (SI))); +typedef unsigned int USItype __attribute__ ((mode (SI))); + +typedef int word_type __attribute__ ((mode (__word__))); + +struct SIstruct {HItype low, high;}; + +typedef union { + struct SIstruct s; + SItype ll; +} SIunion; diff --git a/lib_nios/mult.c b/lib_nios/mult.c new file mode 100644 index 0000000..66bb64d --- /dev/null +++ b/lib_nios/mult.c @@ -0,0 +1,56 @@ +/* + * This file is part of GNU CC. + * + * GNU CC 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, or (at your + * option) any later version. + * + * GNU CC 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 GNU CC; see the file COPYING. If not, write + * to the Free Software Foundation, 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + + +#include <common.h> + +#if !defined(CFG_NIOS_MULT_HW) && !defined(CFG_NIOS_MULT_MSTEP) + +#include "math.h" + +USItype __mulsi3 (USItype a, USItype b) +{ + USItype c = 0; + + while (a != 0) { + if (a & 1) + c += b; + a >>= 1; + b <<= 1; + } + + return c; +} + + +UHItype __mulhi3 (UHItype a, UHItype b) +{ + UHItype c = 0; + + while (a != 0) { + if (a & 1) + c += b; + a >>= 1; + b <<= 1; + } + + return c; +} + +#endif /*!defined(CFG_NIOS_MULT_HW) && !defined(CFG_NIOS_MULT_MSTEP) */ diff --git a/lib_nios/nios_linux.c b/lib_nios/nios_linux.c new file mode 100644 index 0000000..eef1757 --- /dev/null +++ b/lib_nios/nios_linux.c @@ -0,0 +1,34 @@ +/* + * (C) Copyright 2003, Psyent Corporation <www.psyent.com> + * Scott McNutt <smcnutt@psyent.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +#include <common.h> +#include <command.h> + +/* FIXME: Once we find a stable version of uC-linux for nios + * we can get this working. ;-) + * + */ +void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[], + ulong addr, ulong *len_ptr, int verify) +{ +} diff --git a/lib_nios/time.c b/lib_nios/time.c new file mode 100644 index 0000000..765b9c1 --- /dev/null +++ b/lib_nios/time.c @@ -0,0 +1,37 @@ +/* + * (C) Copyright 2003, Psyent Corporation <www.psyent.com> + * Scott McNutt <smcnutt@psyent.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +#include <common.h> + + +extern void dly_clks( unsigned long ticks ); + +void udelay(unsigned long usec) +{ + /* The Nios core doesn't have a timebase, so we do our + * best for now and call a low-level loop that counts + * cpu clocks. + */ + unsigned long cnt = (CONFIG_SYS_CLK_FREQ/1000000) * usec; + dly_clks (cnt); +} |