From fbcd7c8fa65eb695e96a62ea1c1ac7a024fa9dfc Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Fri, 20 Apr 2018 10:19:28 +0200 Subject: bsps: Move start files to bsps This patch is a part of the BSP source reorganization. Update #3285. --- c/src/lib/libbsp/mips/csb350/Makefile.am | 2 +- c/src/lib/libbsp/mips/csb350/start/start.S | 122 --------- c/src/lib/libbsp/mips/hurricane/Makefile.am | 2 +- c/src/lib/libbsp/mips/hurricane/start/start.S | 339 ------------------------ c/src/lib/libbsp/mips/jmr3904/Makefile.am | 2 +- c/src/lib/libbsp/mips/jmr3904/start/start.S | 196 -------------- c/src/lib/libbsp/mips/malta/Makefile.am | 2 +- c/src/lib/libbsp/mips/malta/start/start.S | 221 ---------------- c/src/lib/libbsp/mips/rbtx4925/Makefile.am | 2 +- c/src/lib/libbsp/mips/rbtx4925/start/start.S | 360 -------------------------- c/src/lib/libbsp/mips/rbtx4938/Makefile.am | 2 +- c/src/lib/libbsp/mips/rbtx4938/start/start.S | 359 ------------------------- 12 files changed, 6 insertions(+), 1603 deletions(-) delete mode 100644 c/src/lib/libbsp/mips/csb350/start/start.S delete mode 100644 c/src/lib/libbsp/mips/hurricane/start/start.S delete mode 100644 c/src/lib/libbsp/mips/jmr3904/start/start.S delete mode 100644 c/src/lib/libbsp/mips/malta/start/start.S delete mode 100644 c/src/lib/libbsp/mips/rbtx4925/start/start.S delete mode 100644 c/src/lib/libbsp/mips/rbtx4938/start/start.S (limited to 'c/src/lib/libbsp/mips') diff --git a/c/src/lib/libbsp/mips/csb350/Makefile.am b/c/src/lib/libbsp/mips/csb350/Makefile.am index 49d28530d0..fc43b2e3c4 100644 --- a/c/src/lib/libbsp/mips/csb350/Makefile.am +++ b/c/src/lib/libbsp/mips/csb350/Makefile.am @@ -9,7 +9,7 @@ dist_project_lib_DATA = startup/bsp_specs noinst_PROGRAMS = -start.$(OBJEXT): start/start.S +start.$(OBJEXT): ../../../../../../bsps/mips/csb350/start/start.S $(CPPASCOMPILE) -o $@ -c $< project_lib_DATA = start.$(OBJEXT) diff --git a/c/src/lib/libbsp/mips/csb350/start/start.S b/c/src/lib/libbsp/mips/csb350/start/start.S deleted file mode 100644 index 9aea3f4cae..0000000000 --- a/c/src/lib/libbsp/mips/csb350/start/start.S +++ /dev/null @@ -1,122 +0,0 @@ -/* - * start.S -- startup file for Cogent CSB350 Au1100 based board - * - * Copyright (c) 2005 by Cogent Computer Systems - * Written by Jay Monkman - * - * 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. - * - */ - -#include -#include - - .text - .align 2 - -/* Without the following nop, GDB thinks _start is a data variable. - * This is probably a bug in GDB in handling a symbol that is at the - * start of the .text section. - */ - nop - - .globl _start - .ent _start -_start: - .set noreorder - - /* Get the address of start into $5 in a position independent - * fashion. This lets us know whether we have been relocated or not. - */ - $LF1 = . + 8 - bal $LF1 - nop -_branch: - move $5, $31 /* $5 == where are we */ - li $6, 0x8800000c /* $6 == where we want to be */ - - li v0, SR_CU1|SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR - mtc0 zero, C0_CAUSE - -1: - li v0, SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR -2: -/* Fix high bits, if any, of the PC so that exception handling - doesn't get confused. */ - la v0, 3f - jr v0 - nop -3: - la gp, _gp /* set the global data pointer */ - .end _start - -/* - * zero out the bss section. - */ - .globl zerobss - .ent zerobss -zerobss: - la v0, _fbss - la v1, _end -3: - sw zero,0(v0) - bltu v0,v1,3b - addiu v0,v0,4 /* executed in delay slot */ - - la t0, _stack_init /* initialize stack so we */ - /* We must subtract 24 bytes for the 3 8 byte arguments to main, in - case main wants to write them back to the stack. The caller is - supposed to allocate stack space for parameters in registers in - the old MIPS ABIs. We must do this even though we aren't passing - arguments, because main might be declared to have them. - - Some ports need a larger alignment for the stack, so we subtract - 32, which satisifes the stack for the arguments and keeps the - stack pointer better aligned. */ - subu t0,t0,32 - move sp,t0 /* set stack pointer */ - .end zerobss - - .globl exit .text - .globl init - .ent init -init: - - move a0,zero /* set command line to 0 */ - jal boot_card /* call the program start function */ - nop - - /* fall through to the "exit" routine */ - jal _sys_exit /* call libc exit to run the G++ */ - /* destructors */ - move a0,v0 /* pass through the exit code */ - .end init - -/* - * _sys_exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. NOTE: This is - * the only other routine we provide in the crt0.o object, since - * it may be tied to the "_start" routine. It also allows - * executables that contain a complete world to be linked with - * just the crt0.o object. - */ - .globl _sys_exit - .ent _sys_exit -_sys_exit: -7: -#ifdef GCRT0 - jal _mcleanup - nop -#endif - /* break inst. can cope with 0xfffff, but GAS limits the range: */ - break 1023 - nop - b 7b /* but loop back just in-case */ - nop - .end _sys_exit - -/* EOF crt0.S */ diff --git a/c/src/lib/libbsp/mips/hurricane/Makefile.am b/c/src/lib/libbsp/mips/hurricane/Makefile.am index b3963916a4..61a75df178 100644 --- a/c/src/lib/libbsp/mips/hurricane/Makefile.am +++ b/c/src/lib/libbsp/mips/hurricane/Makefile.am @@ -8,7 +8,7 @@ dist_project_lib_DATA = startup/bsp_specs #isr -start.$(OBJEXT): start/start.S +start.$(OBJEXT): ../../../../../../bsps/mips/hurricane/start/start.S $(CPPASCOMPILE) -o $@ -c $< project_lib_DATA = start.$(OBJEXT) diff --git a/c/src/lib/libbsp/mips/hurricane/start/start.S b/c/src/lib/libbsp/mips/hurricane/start/start.S deleted file mode 100644 index e3d97cd167..0000000000 --- a/c/src/lib/libbsp/mips/hurricane/start/start.S +++ /dev/null @@ -1,339 +0,0 @@ -/* - -Based upon IDT provided code with the following release: - -This source code has been made available to you by IDT on an AS-IS -basis. Anyone receiving this source is licensed under IDT copyrights -to use it in any way he or she deems fit, including copying it, -modifying it, compiling it, and redistributing it either with or -without modifications. No license under IDT patents or patent -applications is to be implied by the copyright license. - -Any user of this software should understand that IDT cannot provide -technical support for this software and will not be responsible for -any consequences resulting from the use of this software. - -Any person who transfers this source code or any derivative work must -include the IDT copyright notice, this paragraph, and the preceeding -two paragraphs in the transferred software. - -COPYRIGHT IDT CORPORATION 1996 -LICENSED MATERIAL - PROGRAM PROPERTY OF IDT -*/ - -/************************************************************************* -** -** Copyright 1991-95 Integrated Device Technology, Inc. -** All Rights Reserved -** -**************************************************************************/ - - -#include -#include -#include - -#include - -#if 0 - .extern _fdata,4 /* this is defined by the linker */ - .extern _edata,4 /* this is defined by the linker */ - .extern _idata,4 /* this is defined by the linker */ -#endif - .extern _fbss,4 /* this is defined by the linker */ - .extern end,4 /* this is defined by the linker */ - - .lcomm sim_mem_cfg_struct,12 - - .text - -/* For the V3 Eval board, we can safely assume that we have - at least 16 megabytes of RAM */ -#define HARD_CODED_MEM_SIZE 0x1000000 - -#define TMP_STKSIZE 1024 - -/* -** P_STACKSIZE is the size of the Prom Stack. -** the prom stack grows downward -*/ -#define P_STACKSIZE 0x2000 /* sets stack size to 8k */ - -/************************************************************************** -** -** start - Typical standalone start up code required for R3000/R4000 -** -** -** 1) Initialize the STATUS Register -** a) Clear parity error bit -** b) Set co_processor 1 usable bit ON -** c) Clear all IntMask Enables -** d) Set kernel/disabled mode -** 2) Initialize Cause Register -** a) clear software interrupt bits -** 3) Determine FPU installed or not -** if not, clear CoProcessor 1 usable bit -** 4) Clear bss area -** 5) MUST allocate temporary stack until memory size determined -** It MUST be uncached to prevent overwriting when caches are cleared -** 6) Install exception handlers -** 7) Determine memory and cache sizes -** 8) Establish permanent stack (cached or uncached as defined by bss) -** 9) Flush Instruction and Data caches -** 10) If there is a Translation Lookaside Buffer, Clear the TLB -** 11) Execute initialization code if the IDT/c library is to be used -** -** 12) Jump to user's "main()" (boot_card() for RTEMS) -** 13) Jump to promexit -** -** IDT/C 5.x defines _R3000, IDT/C 6.x defines _R4000 internally. -** This is used to mark code specific to R3xxx or R4xxx processors. -** IDT/C 6.x defines __mips to be the ISA level for which we're -** generating code. This is used to make sure the stack etc. is -** double word aligned, when using -mips3 (default) or -mips2, -** when compiling with IDT/C6.x -** -***************************************************************************/ - -FRAME(start,sp,0,ra) - - .set noreorder -#if __mips_fpr == 64 - li v0,SR_CU1|SR_FR|SR_DE /* initally clear ERL, enable FPU with 64 bit regs, disable cache errors */ -#else - li v0,SR_CU1|SR_DE /* initally clear ERL, enable FPU with 32 bit regs, disable cache errors */ -#endif - - mtc0 v0,C0_SR /* clr IntMsks/ kernel/disabled mode */ - nop - mtc0 zero,C0_CAUSE /* clear software interrupts */ - nop - - la t0,0xBE200000 /* on Hurricane board, enable interrupt output signal from UART ch. B */ - li t1,0x8 /* UART INT B signal is left tri-state'd after reset, this results in processor interrupt signal being driven active low */ - sw t1,0x10(t0) - - li v0,CFG_C_NONCOHERENT # initialise default cache mode - mtc0 v0,C0_CONFIG - -/* -** check to see if an fpu is really plugged in -*/ - li t3,0xaaaa5555 /* put a's and 5's in t3 */ - mtc1 t3,fp0 /* try to write them into fp0 */ - mtc1 zero,fp1 /* try to write zero in fp */ - mfc1 t0,fp0 - mfc1 t1,fp1 - nop - bne t0,t3,1f /* branch if no match */ - nop - bne t1,zero,1f /* double check for positive id */ - nop - /* We have a FPU. clear fcsr */ - ctc1 zero, fcr31 - j 2f /* status register already correct */ - nop -1: - li v0,SR_DE /* clear ERL and disable FPA */ - - mtc0 v0, C0_SR /* reset status register */ -2: - la gp, _gp - -#if 0 - /* Initialize data sections from "rom" copy */ - la t0,_idata /* address of initialization data (copy of data sections placed in ROM) */ - la t1,_fdata /* start of initialized data section */ - la t2,_edata /* end of initialized data section */ -3: - lw t3,0(t0) - sw t3,0(t1) - addiu t1,t1,4 - bne t1,t2,3b - addiu t0,t0,4 -#endif - - /* clear bss before using it */ - la v0,_fbss /* start of bss */ - la v1,end /* end of bss */ -4: sw zero,0(v0) - bltu v0,v1,4b - add v0,4 - - -/************************************************************************ -** -** Temporary Stack - needed to handle stack saves until -** memory size is determined and permanent stack set -** -** MUST be uncached to avoid confusion at cache -** switching during memory sizing -** -*************************************************************************/ - /* For MIPS 3, we need to be sure that the stack is aligned on a - * double word boundary. - */ - andi t0, v0, 0x7 - beqz t0, 11f /* Last three bits Zero, already aligned */ - nop - add v0, 4 -11: - - or v0, K1BASE /* switch to uncached */ - add v1, v0, TMP_STKSIZE /* end of bss + length of tmp stack */ - sub v1, v1, (4*4) /* overhead */ - move sp, v1 /* set sp to top of stack */ -4: sw zero, 0(v0) - bltu v0, v1, 4b /* clear out temp stack */ - add v0, 4 - -/* jal init_exc_vecs */ /* install exception handlers */ -/* nop */ /* MUST do before memory probes */ - - /* Force processor into uncached space during memory/cache probes */ - la v0, 5f - li v1, K1BASE - or v0, v1 - j v0 - nop -5: - - li a0, HARD_CODED_MEM_SIZE /* Set memory size global */ - jal set_memory_size - nop - - la a0, sim_mem_cfg_struct - jal get_mem_conf /* Make call to get mem size */ - nop - la a0, sim_mem_cfg_struct - lw a0, 0(a0) /* Get memory size from struct */ - - jal config_cache /* determine size of D & I caches */ - nop - - move v0, a0 /* mem_size */ - - /* For MIPS 3, we need to be sure that the stack (and hence v0 - * here) is aligned on a double word boundary. - */ - andi t0, v0, 0x7 - beqz t0, 12f /* Last three bits Zero, already aligned */ - nop - subu v0, 4 /* mem_size was not aligned on doubleword bdry????*/ -12: - - - -/************************************************************************** -** -** Permanent Stack - now know top of memory, put permanent stack there -** -***************************************************************************/ - - la t2, _fbss /* cache mode as linked */ - and t2, 0xF0000000 /* isolate segment */ - la t1, 6f - j t1 /* back to original cache mode */ - nop -6: - or v0, t2 /* stack back to original cache mode */ - addiu v0,v0,-16 /* overhead */ - move sp, v0 /* now replace count w top of memory */ - move v1, v0 - subu v1, P_STACKSIZE /* clear requested stack size */ - -7: sw zero, 0(v1) /* clear P_STACKSIZE stack */ - bltu v1,v0,7b - add v1, 4 - .set reorder - -/* FIX THIS - This corrupts memory spaces */ -/* jal flush_cache_nowrite */ /* flush Data & Instruction caches */ - -/* jal mon_flush_cache */ - -/************************************************************************** -** -** If this chip supports a Translation Lookaside Buffer, clear it -** -***************************************************************************/ - - .set noreorder - mfc0 t1, C0_SR /* look at Status Register */ - nop - .set reorder - - jal init_tlb /* clear the tlb */ - -/* Force processor into cached instruction space for rest of initialization */ -#if 0 - la t0, 1f - li t1, K0BASE /* force into cached space */ - or t0, t1 - j t0 - nop -1: -#endif - -/************************************************************************ -** -** Initialization required if using IDT/c or libc.a, standard C Lib -** -** can SKIP if not necessary for application -** -************************************************************************/ -8: - -/* FIX THIS - Need the pmon equivalent - jal idtsim_init_sbrk - jal idtsim_init_file -*/ - -/*********************** END I/O initialization **********************/ - - - move a0,zero /* Set command line passed to main */ - jal boot_card - nop - - # jump to the "exit" routine - jal idtsim__exit - move a0,v0 # pass through the exit code - - - # FIX THIS - Need the pmon equivalent - # jal idtsim_promexit - -1: - beq zero,zero,1b - nop - -ENDFRAME(start) - -/* - * _sys_exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. NOTE: This is - * the only other routine we provide in the crt0.o object, since - * it may be tied to the "_start" routine. It also allows - * executables that contain a complete world to be linked with - * just the crt0.o object. - */ -FRAME(_sys_exit,sp,0,ra) - - break 1023 - nop -13: - b 13b # but loop back just in-case - nop - -ENDFRAME(_sys_exit) - - - - .globl __sizemem - .ent __sizemem -__sizemem: - li v0,HARD_CODED_MEM_SIZE - j ra - nop - .end __sizemem diff --git a/c/src/lib/libbsp/mips/jmr3904/Makefile.am b/c/src/lib/libbsp/mips/jmr3904/Makefile.am index 5b9516beaf..9c9ffcf56d 100644 --- a/c/src/lib/libbsp/mips/jmr3904/Makefile.am +++ b/c/src/lib/libbsp/mips/jmr3904/Makefile.am @@ -8,7 +8,7 @@ dist_project_lib_DATA = startup/bsp_specs #isr -start.$(OBJEXT): start/start.S +start.$(OBJEXT): ../../../../../../bsps/mips/jmr3904/start/start.S $(CPPASCOMPILE) -o $@ -c $< project_lib_DATA = start.$(OBJEXT) diff --git a/c/src/lib/libbsp/mips/jmr3904/start/start.S b/c/src/lib/libbsp/mips/jmr3904/start/start.S deleted file mode 100644 index 92c0ddd956..0000000000 --- a/c/src/lib/libbsp/mips/jmr3904/start/start.S +++ /dev/null @@ -1,196 +0,0 @@ -/* - * start.S -- startup file for JMR3904 BSP based upon crt0.S from - * newlib-1.8.2/libgloss/mips and adapted for RTEMS. - * - * crt0.S -- startup file for MIPS. - * - * Copyright (c) 1995, 1996, 1997 Cygnus Support - * - * The authors hereby grant permission to use, copy, modify, distribute, - * and license this software and its documentation for any purpose, provided - * that existing copyright notices are retained in all copies and that this - * notice is included verbatim in any distributions. No written agreement, - * license, or royalty fee is required for any of the authorized uses. - * Modifications to this software may be copyrighted by their authors - * and need not follow the licensing terms described here, provided that - * the new terms are clearly indicated on the first page of each file where - * they apply. - */ - -#include -#include - -#ifdef __mips16 -/* This file contains 32 bit assembly code. */ - .set nomips16 -#endif - -/* This is for referencing addresses that are not in the .sdata or - .sbss section under embedded-pic, or before we've set up gp. */ -#ifdef __mips_embedded_pic -# ifdef __mips64 -# define LA(t,x) la t,x-PICBASE ; daddu t,s0,t -# else -# define LA(t,x) la t,x-PICBASE ; addu t,s0,t -# endif -#else /* __mips_embedded_pic */ -# define LA(t,x) la t,x -#endif /* __mips_embedded_pic */ - - .text - .align 2 - -/* Without the following nop, GDB thinks _start is a data variable. - * This is probably a bug in GDB in handling a symbol that is at the - * start of the .text section. - */ - nop - - .globl _start - .ent _start -_start: - .set noreorder - /* Get the address of start into $5 in a position independent fashion. - ** This lets us know whether we have been relocated or not. - */ - $LF1 = . + 8 - bal $LF1 - nop -_branch: - move $5, $31 # $5 == where are we - li $6, 0x8800000c # $6 == where we want to be -/* #la $6,_branch */ - beq $5, $6, _start_in_ram - nop - /* relocate the code from EEPROM to RAM */ - la $7, _edata -relocate: - lw $8, ($5) # $8 = *EEPROM - addu $5, $5, 4 # EEPROM++ - sw $8, ($6) # *RAM = $8 - addu $6, $6, 4 # RAM++ - bne $6, $7, relocate # copied all the way to edata? - nop - la $6, _start_in_ram - jr $6 - nop - .end _start - - .globl _start_in_ram - .ent _start_in_ram -_start_in_ram: - nop - -#ifdef __mips_embedded_pic - PICBASE = .+8 - bal PICBASE - nop - move s0,$31 -#endif - - li v0, SR_CU1|SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR - mtc0 zero, C0_CAUSE - -/* Check for FPU presence */ -#ifndef __mips_soft_float -/* This doesn't work if there is no FPU. We get illegal instruction - exceptions. */ - li t2,0xAAAA5555 - mtc1 t2,fp0 /* write to FPR 0 */ - mtc1 zero,fp1 /* write to FPR 1 */ - mfc1 t0,fp0 - mfc1 t1,fp1 - nop - bne t0,t2,1f /* check for match */ - nop - bne t1,zero,1f /* double check */ - nop -#ifndef __mips64 /* Clear the FR bit */ - li v0, SR_CU1|SR_PE|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR -#endif - j 2f - nop -#endif -1: - li v0, SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR -2: -/* Fix high bits, if any, of the PC so that exception handling - doesn't get confused. */ - LA (v0, 3f) - jr v0 - nop -3: - LA (gp, _gp) # set the global data pointer - .end _start_in_ram - -/* - * zero out the bss section. - */ - .globl zerobss - .ent zerobss -zerobss: - LA (v0, _fbss) - LA (v1, _end) -3: - sw zero,0(v0) - bltu v0,v1,3b - addiu v0,v0,4 # executed in delay slot - - la t0, _stack_init # initialize stack so we - /* We must subtract 24 bytes for the 3 8 byte arguments to main, in - case main wants to write them back to the stack. The caller is - supposed to allocate stack space for parameters in registers in - the old MIPS ABIs. We must do this even though we aren't passing - arguments, because main might be declared to have them. - - Some ports need a larger alignment for the stack, so we subtract - 32, which satisifes the stack for the arguments and keeps the - stack pointer better aligned. */ - subu t0,t0,32 - move sp,t0 # set stack pointer - .end zerobss - - .globl exit .text - .globl init - .ent init -init: - - move a0,zero # set command line to 0 - jal boot_card # call the program start function - nop - - /* fall through to the "exit" routine */ - jal _sys_exit /* call libc exit to run the G++ */ - /* destructors */ - move a0,v0 /* pass through the exit code */ - .end init - -/* - * _sys_exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. NOTE: This is - * the only other routine we provide in the crt0.o object, since - * it may be tied to the "_start" routine. It also allows - * executables that contain a complete world to be linked with - * just the crt0.o object. - */ - .globl bsp_reset -bsp_reset: - .globl _sys_exit - .ent _sys_exit -_sys_exit: -7: -#ifdef GCRT0 - jal _mcleanup - nop -#endif - /* break instruction can cope with 0xfffff, but GAS limits the range: */ - break 1023 - nop - b 7b # but loop back just in-case - nop - .end _sys_exit - -/* EOF crt0.S */ diff --git a/c/src/lib/libbsp/mips/malta/Makefile.am b/c/src/lib/libbsp/mips/malta/Makefile.am index c955b58a4a..b7bea74064 100644 --- a/c/src/lib/libbsp/mips/malta/Makefile.am +++ b/c/src/lib/libbsp/mips/malta/Makefile.am @@ -13,7 +13,7 @@ dist_project_lib_DATA = startup/bsp_specs #irq -start.$(OBJEXT): start/start.S +start.$(OBJEXT): ../../../../../../bsps/mips/malta/start/start.S $(CPPASCOMPILE) -o $@ -c $< project_lib_DATA = start.$(OBJEXT) diff --git a/c/src/lib/libbsp/mips/malta/start/start.S b/c/src/lib/libbsp/mips/malta/start/start.S deleted file mode 100644 index 8f5f96489f..0000000000 --- a/c/src/lib/libbsp/mips/malta/start/start.S +++ /dev/null @@ -1,221 +0,0 @@ -/* - * start.S -- startup file for JMR3904 BSP based upon crt0.S from - * newlib-1.8.2/libgloss/mips and adapted for RTEMS. - * - * crt0.S -- startup file for MIPS. - * - * Copyright (c) 1995, 1996, 1997 Cygnus Support - * - * The authors hereby grant permission to use, copy, modify, distribute, - * and license this software and its documentation for any purpose, provided - * that existing copyright notices are retained in all copies and that this - * notice is included verbatim in any distributions. No written agreement, - * license, or royalty fee is required for any of the authorized uses. - * Modifications to this software may be copyrighted by their authors - * and need not follow the licensing terms described here, provided that - * the new terms are clearly indicated on the first page of each file where - * they apply. - */ - -#include -#include - -#include - -#ifdef __mips16 -/* This file contains 32 bit assembly code. */ - .set nomips16 -#endif - -/* This is for referencing addresses that are not in the .sdata or - .sbss section under embedded-pic, or before we've set up gp. */ -#ifdef __mips_embedded_pic -# ifdef __mips64 -# define LA(t,x) la t,x-PICBASE ; daddu t,s0,t -# else -# define LA(t,x) la t,x-PICBASE ; addu t,s0,t -# endif -#else /* __mips_embedded_pic */ -# define LA(t,x) la t,x -#endif /* __mips_embedded_pic */ - - .text - .align 2 - -/* Without the following nop, GDB thinks _start is a data variable. - * This is probably a bug in GDB in handling a symbol that is at the - * start of the .text section. - */ - nop - nop - nop - nop - nop - nop - nop - nop - nop - .globl _start - .ent _start -_start: - nop - nop - nop - nop - nop - nop - nop - nop - .set noreorder - /* Get the address of start into $5 in a position independent fashion. - ** This lets us know whether we have been relocated or not. - */ - $LF1 = . + 8 - bal $LF1 - nop -_branch: -#if 0 - move $5, $31 # $5 == where are we - li $6, 0x8800000c # $6 == where we want to be -/* #la $6,_branch */ - beq $5, $6, _start_in_ram - nop - /* relocate the code from EEPROM to RAM */ - la $7, _edata -relocate: - nop - lw $8, ($5) # $8 = *EEPROM - addu $5, $5, 4 # EEPROM++ - sw $8, ($6) # *RAM = $8 - addu $6, $6, 4 # RAM++ - bne $6, $7, relocate # copied all the way to edata? - nop - la $6, _start_in_ram - jr $6 - nop - .end _start - - .globl _start_in_ram - .ent _start_in_ram -#endif -_start_in_ram: - nop -#if 0 -#ifdef __mips_embedded_pic - PICBASE = .+8 - bal PICBASE - nop - move s0,$31 -#endif -#endif - li v0, SR_CU1|SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR - mtc0 zero, C0_CAUSE - -#if 0 -/* Check for FPU presence */ -#ifndef __mips_soft_float -/* This doesn't work if there is no FPU. We get illegal instruction - exceptions. */ - li t2,0xAAAA5555 - mtc1 t2,fp0 /* write to FPR 0 */ - mtc1 zero,fp1 /* write to FPR 1 */ - mfc1 t0,fp0 - mfc1 t1,fp1 - nop - bne t0,t2,1f /* check for match */ - nop - bne t1,zero,1f /* double check */ - nop -#ifndef __mips64 /* Clear the FR bit */ - li v0, SR_CU1|SR_PE|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR -#endif - j 2f - nop -#endif -#endif - -1: - li v0, SR_PE|SR_FR|SR_KX|SR_SX|SR_UX - mtc0 v0, C0_SR -2: -/* Fix high bits, if any, of the PC so that exception handling - doesn't get confused. */ - LA (v0, 3f) - jr v0 - nop -3: - LA (gp, _gp) # set the global data pointer -#if 0 - .end _start_in_ram -#else - .end _start -#endif - -/* - * zero out the bss section. - */ - .globl zerobss - .ent zerobss -zerobss: - LA (v0, _fbss) - LA (v1, _end) -3: - sw zero,0(v0) - bltu v0,v1,3b - addiu v0,v0,4 # executed in delay slot - - la t0, _stack_init # initialize stack so we - /* We must subtract 24 bytes for the 3 8 byte arguments to main, in - case main wants to write them back to the stack. The caller is - supposed to allocate stack space for parameters in registers in - the old MIPS ABIs. We must do this even though we aren't passing - arguments, because main might be declared to have them. - - Some ports need a larger alignment for the stack, so we subtract - 32, which satisifes the stack for the arguments and keeps the - stack pointer better aligned. */ - subu t0,t0,32 - move sp,t0 # set stack pointer - .end zerobss - - .globl exit .text - .globl init - .ent init -init: - nop - jal init_tlb /* clear the tlb */ - move a0,zero # set command line to 0 - jal boot_card # call the program start function - nop - -dead: - b dead - nop - .end init - -/* - * _sys_exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. NOTE: This is - * the only other routine we provide in the crt0.o object, since - * it may be tied to the "_start" routine. It also allows - * executables that contain a complete world to be linked with - * just the crt0.o object. - */ - .globl _sys_exit - .ent _sys_exit -_sys_exit: -7: -#ifdef GCRT0 - jal _mcleanup - nop -#endif - /* break instruction can cope with 0xfffff, but GAS limits the range: */ - break 1023 - nop - b 7b # but loop back just in-case - nop - .end _sys_exit - -/* EOF crt0.S */ diff --git a/c/src/lib/libbsp/mips/rbtx4925/Makefile.am b/c/src/lib/libbsp/mips/rbtx4925/Makefile.am index 76b2ef77d1..ca8846dfd4 100644 --- a/c/src/lib/libbsp/mips/rbtx4925/Makefile.am +++ b/c/src/lib/libbsp/mips/rbtx4925/Makefile.am @@ -10,7 +10,7 @@ dist_project_lib_DATA = startup/bsp_specs noinst_PROGRAMS = -start.$(OBJEXT): start/start.S +start.$(OBJEXT): ../../../../../../bsps/mips/rbtx4925/start/start.S $(CPPASCOMPILE) -o $@ -c $< project_lib_DATA = start.$(OBJEXT) diff --git a/c/src/lib/libbsp/mips/rbtx4925/start/start.S b/c/src/lib/libbsp/mips/rbtx4925/start/start.S deleted file mode 100644 index 058426f8c7..0000000000 --- a/c/src/lib/libbsp/mips/rbtx4925/start/start.S +++ /dev/null @@ -1,360 +0,0 @@ -/* - -Based upon IDT provided code with the following release: - -This source code has been made available to you by IDT on an AS-IS -basis. Anyone receiving this source is licensed under IDT copyrights -to use it in any way he or she deems fit, including copying it, -modifying it, compiling it, and redistributing it either with or -without modifications. No license under IDT patents or patent -applications is to be implied by the copyright license. - -Any user of this software should understand that IDT cannot provide -technical support for this software and will not be responsible for -any consequences resulting from the use of this software. - -Any person who transfers this source code or any derivative work must -include the IDT copyright notice, this paragraph, and the preceeding -two paragraphs in the transferred software. - -COPYRIGHT IDT CORPORATION 1996 -LICENSED MATERIAL - PROGRAM PROPERTY OF IDT - - -************************************************************************* -** -** Copyright 1991-95 Integrated Device Technology, Inc. -** All Rights Reserved -** -** idt_csu.S -- IDT stand alone startup code -** -**************************************************************************/ -#include -#include -#include - -#include - - .extern mon_flush_cache - -#if 0 - .extern _fdata,4 /* this is defined by the linker */ - .extern _edata,4 /* this is defined by the linker */ - .extern _idata,4 /* this is defined by the linker */ -#endif - .extern _fbss,4 /* this is defined by the linker */ - .extern end,4 /* this is defined by the linker */ - - .lcomm sim_mem_cfg_struct,12 - - .text - -#define HARD_CODED_MEM_SIZE 0x1000000 /* RBTX4925 has 16 megabytes of RAM */ -#define PMON_VECTOR 0xbfc00500 - -#define TMP_STKSIZE 1024 - -/* -** P_STACKSIZE is the size of the Prom Stack. -** the prom stack grows downward -*/ -#define P_STACKSIZE 0x2000 /* sets stack size to 8k */ - - -/************************************************************************** -** -** start - Typical standalone start up code required for R3000/R4000 -** -** -** 1) Initialize the STATUS Register -** a) Clear parity error bit -** b) Set co_processor 1 usable bit ON -** c) Clear all IntMask Enables -** d) Set kernel/disabled mode -** 2) Initialize Cause Register -** a) clear software interrupt bits -** 3) Determine FPU installed or not -** if not, clear CoProcessor 1 usable bit -** 4) Initialize data areas. Clear bss area. -** 5) MUST allocate temporary stack until memory size determined -** It MUST be uncached to prevent overwriting when caches are cleared -** 6) Install exception handlers -** 7) Determine memory and cache sizes -** 8) Establish permanent stack (cached or uncached as defined by bss) -** 9) Flush Instruction and Data caches -** 10) If there is a Translation Lookaside Buffer, Clear the TLB -** 11) Execute initialization code if the IDT/c library is to be used -** -** 12) Jump to user's "main()" -** 13) Jump to promexit -** -** IDT/C 5.x defines _R3000, IDT/C 6.x defines _R4000 internally. -** This is used to mark code specific to R3xxx or R4xxx processors. -** IDT/C 6.x defines __mips to be the ISA level for which we're -** generating code. This is used to make sure the stack etc. is -** double word aligned, when using -mips3 (default) or -mips2, -** when compiling with IDT/C6.x -** -***************************************************************************/ - -FRAME(start,sp,0,ra) - - .set noreorder -#if __mips_fpr == 64 - li v0,SR_CU1|SR_FR /* initally clear ERL, enable FPU with 64 bit regs */ -#else - li v0,SR_CU1 /* initally clear ERL, enable FPU with 32 bit regs */ -#endif - - mtc0 v0,C0_SR /* clr IntMsks/ kernel/disabled mode */ - nop - mtc0 zero,C0_CAUSE /* clear software interrupts */ - nop - - li v0,CFG_C_NONCOHERENT /* initialise default cache mode */ - mtc0 v0,C0_CONFIG - -/* -** check to see if a fpu is really plugged in -*/ - li t3,0xaaaa5555 /* put a's and 5's in t3 */ - mtc1 t3,fp0 /* try to write them into fp0 */ - mtc1 zero,fp1 /* try to write zero in fp */ - mfc1 t0,fp0 - mfc1 t1,fp1 - nop - bne t0,t3,1f /* branch if no match */ - nop - bne t1,zero,1f /* double check for positive id */ - nop - /* We have a FPU. clear fcsr */ - ctc1 zero, fcr31 - j 2f /* status register already correct */ - nop -1: - li v0,0x0 /* clear ERL and disable FPA */ - - mtc0 v0, C0_SR /* reset status register */ -2: - la gp, _gp /* Initialize gp register (pointer to "small" data)*/ - -#if 0 - /* Initialize data sections from "rom" copy */ - la t0,_idata /* address of initialization data (copy of data sections placed in ROM) */ - la t1,_fdata /* start of initialized data section */ - la t2,_edata /* end of initialized data section */ -3: - lw t3,0(t0) - sw t3,0(t1) - addiu t1,t1,4 - bne t1,t2,3b - addiu t0,t0,4 -#endif - - /* clear bss before using it */ - la v0,_fbss /* start of bss */ - la v1,end /* end of bss */ -4: sw zero,0(v0) - bltu v0,v1,4b - add v0,4 - - -/************************************************************************ -** -** Temporary Stack - needed to handle stack saves until -** memory size is determined and permanent stack set -** -** MUST be uncached to avoid confusion at cache -** switching during memory sizing -** -*************************************************************************/ - /* For MIPS 3, we need to be sure that the stack is aligned on a - * double word boundary. - */ - andi t0, v0, 0x7 - beqz t0, 11f /* Last three bits Zero, already aligned */ - nop - add v0, 4 -11: - - or v0, K1BASE /* switch to uncached */ - add v1, v0, TMP_STKSIZE /* end of bss + length of tmp stack */ - sub v1, v1, (4*4) /* overhead */ - move sp, v1 /* set sp to top of stack */ -4: sw zero, 0(v0) - bltu v0, v1, 4b /* clear out temp stack */ - add v0, 4 - -/* jal init_exc_vecs */ /* install exception handlers */ -/* nop */ /* MUST do before memory probes */ - - /* Force processor into uncached space during memory/cache probes */ - la v0, 5f - li v1, K1BASE - or v0, v1 - j v0 - nop -5: - - li a0, HARD_CODED_MEM_SIZE /* Set memory size global */ - jal set_memory_size - nop - - la a0, sim_mem_cfg_struct - jal get_mem_conf /* Make call to get mem size */ - nop - la a0, sim_mem_cfg_struct - lw a0, 0(a0) /* Get memory size from struct */ - - jal config_cache /* determine size of D & I caches */ - nop - - move v0, a0 /* mem_size */ - - /* For MIPS 3, we need to be sure that the stack (and hence v0 - * here) is aligned on a double word boundary. - */ - andi t0, v0, 0x7 - beqz t0, 12f /* Last three bits Zero, already aligned */ - nop - subu v0, 4 /* mem_size was not aligned on doubleword bdry????*/ -12: - - - -/************************************************************************** -** -** Permanent Stack - now know top of memory, put permanent stack there -** -***************************************************************************/ - - la t2, _fbss /* cache mode as linked */ - and t2, 0xF0000000 /* isolate segment */ - la t1, 6f - j t1 /* back to original cache mode */ - nop -6: - or v0, t2 /* stack back to original cache mode */ - addiu v0,v0,-16 /* overhead */ - move sp, v0 /* now replace count w top of memory */ - move v1, v0 - subu v1, P_STACKSIZE /* clear requested stack size */ - -7: sw zero, 0(v1) /* clear P_STACKSIZE stack */ - bltu v1,v0,7b - add v1, 4 - - -/* Invalidate data cache*/ - lui t0, 0x8000 /* Set starting address */ - addi t1, t0, 0x2000 /* Calculate end address (assume worst case of 32 KByte / 4 Way cache) */ - /* D-Cache Writeback and Invalidate */ -1: bge t0, t1, 2f /* if(t0>=end_addr) then exit */ - nop - cache 1, 0(t0) /* Index_Writeback_Inv_D way 0 */ - cache 1, 1(t0) /* Index_Writeback_Inv_D way 1 */ - cache 1, 2(t0) /* Index_Writeback_Inv_D way 2 */ - cache 1, 3(t0) /* Index_Writeback_Inv_D way 3 */ - b 1b - addi t0, t0, 32 -2: - -/* Invalidate instruction cache*/ - lui t0, 0x8000 /* Set starting address */ - addi t1, t0, 0x2000 /* Calculate end address (assume worst case of 32 KByte / 4 Way cache) */ - /* I-Cache Disable */ - mfc0 t2, C0_CONFIG /* get C0_Config */ - lui t3, 0x2 /* C0_CONFIG#17 ICE# */ - or t3, t2, t3 /* set ICE# bit */ - mtc0 t3, C0_CONFIG /* set C_Config */ - b 1f /* stop streaming */ - nop - /* I-Cache Invalidate */ -1: bge t0, t1, 2f /* if(t0>=end_addr) then exit */ - nop - cache 0, 0(t0) /* Index_Invalidate_I way 0 */ - cache 0, 1(t0) /* Index_Invalidate_I way 1 */ - cache 0, 2(t0) /* Index_Invalidate_I way 2 */ - cache 0, 3(t0) /* Index_Invalidate_I way 3 */ - b 1b - addi t0, t0, 32 - /* I-Cache Enable */ -2: mtc0 t2, C0_CONFIG /* set C0_Config */ - nop - -/* Lock first 4k of PMON into instruction cache. This includes interrupt service code which - we don't want to run out of slow flash device. */ - - la t0,0x9fc00000 - li t1, 0x1000 - - move t3, t0 - addu t1, t0, t1 -1: bge t0, t1, 2f - nop - lui t2, 0x1fff /* MASK */ - ori t2, t2, 0xf000 - and t2, t3, t2 /* virtual->physical */ - srl t2, t2, 4 /* [31:12] --> [35:8] */ - ori t2, t2, 0x00c4 /* Set Valid & Lock Bits */ - mtc0 t2, C0_TAGLO /* Load data to TagLo reg. */ - nop - cache 0x08, 3(t0) /* 2(I)=0x08: Index_Store_Tag(I$) Way3*/ - nop - cache 0x14, 3(t0) /* 5(I)=0x14: Fill(Memory->Cache) Way3*/ - b 1b - addi t0, t0, 32 -2: nop - - .set reorder - -/* -** Clear Translation Lookaside Buffer (TLB) -*/ - jal init_tlb /* clear the tlb */ - -/* -** End of CPU initialization, ready to start kernel -*/ - move a0,zero /* Set argc passed to main */ - jal boot_card - nop - -/* Kernel has been shutdown, jump to the "exit" routine */ - jal _sys_exit - move a0,v0 # pass through the exit code - -1: - beq zero,zero,1b - nop - -ENDFRAME(start) - -/* - * _sys_exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. NOTE: This is - * the only other routine we provide in the crt0.o object, since - * it may be tied to the "_start" routine. It also allows - * executables that contain a complete world to be linked with - * just the crt0.o object. - */ -FRAME(_sys_exit,sp,0,ra) - - break 1023 - nop -13: - b 13b # but loop back just in-case - nop - -ENDFRAME(_sys_exit) - - - - .globl __sizemem - .ent __sizemem -__sizemem: - li v0,HARD_CODED_MEM_SIZE - j ra - nop - .end __sizemem - diff --git a/c/src/lib/libbsp/mips/rbtx4938/Makefile.am b/c/src/lib/libbsp/mips/rbtx4938/Makefile.am index 6af4ffc71d..2125aec0e7 100644 --- a/c/src/lib/libbsp/mips/rbtx4938/Makefile.am +++ b/c/src/lib/libbsp/mips/rbtx4938/Makefile.am @@ -10,7 +10,7 @@ dist_project_lib_DATA = startup/bsp_specs noinst_PROGRAMS = -start.$(OBJEXT): start/start.S +start.$(OBJEXT): ../../../../../../bsps/mips/rbtx4938/start/start.S $(CPPASCOMPILE) -o $@ -c $< project_lib_DATA = start.$(OBJEXT) diff --git a/c/src/lib/libbsp/mips/rbtx4938/start/start.S b/c/src/lib/libbsp/mips/rbtx4938/start/start.S deleted file mode 100644 index 406f1b6bbd..0000000000 --- a/c/src/lib/libbsp/mips/rbtx4938/start/start.S +++ /dev/null @@ -1,359 +0,0 @@ -/* - -Based upon IDT provided code with the following release: - -This source code has been made available to you by IDT on an AS-IS -basis. Anyone receiving this source is licensed under IDT copyrights -to use it in any way he or she deems fit, including copying it, -modifying it, compiling it, and redistributing it either with or -without modifications. No license under IDT patents or patent -applications is to be implied by the copyright license. - -Any user of this software should understand that IDT cannot provide -technical support for this software and will not be responsible for -any consequences resulting from the use of this software. - -Any person who transfers this source code or any derivative work must -include the IDT copyright notice, this paragraph, and the preceeding -two paragraphs in the transferred software. - -COPYRIGHT IDT CORPORATION 1996 -LICENSED MATERIAL - PROGRAM PROPERTY OF IDT - - -************************************************************************* -** -** Copyright 1991-95 Integrated Device Technology, Inc. -** All Rights Reserved -** -** idt_csu.S -- IDT stand alone startup code -** -**************************************************************************/ -#include -#include -#include - -#include - - .extern mon_flush_cache - -#if 0 - .extern _fdata,4 /* this is defined by the linker */ - .extern _edata,4 /* this is defined by the linker */ - .extern _idata,4 /* this is defined by the linker */ -#endif - .extern _fbss,4 /* this is defined by the linker */ - .extern end,4 /* this is defined by the linker */ - - .lcomm sim_mem_cfg_struct,12 - - .text - -#define HARD_CODED_MEM_SIZE 0x1000000 /* RBTX4938 has 16 megabytes of RAM */ -#define PMON_VECTOR 0xbfc00500 - -#define TMP_STKSIZE 1024 - -/* -** P_STACKSIZE is the size of the Prom Stack. -** the prom stack grows downward -*/ -#define P_STACKSIZE 0x2000 /* sets stack size to 8k */ - -/************************************************************************** -** -** start - Typical standalone start up code required for R3000/R4000 -** -** -** 1) Initialize the STATUS Register -** a) Clear parity error bit -** b) Set co_processor 1 usable bit ON -** c) Clear all IntMask Enables -** d) Set kernel/disabled mode -** 2) Initialize Cause Register -** a) clear software interrupt bits -** 3) Determine FPU installed or not -** if not, clear CoProcessor 1 usable bit -** 4) Initialize data areas. Clear bss area. -** 5) MUST allocate temporary stack until memory size determined -** It MUST be uncached to prevent overwriting when caches are cleared -** 6) Install exception handlers -** 7) Determine memory and cache sizes -** 8) Establish permanent stack (cached or uncached as defined by bss) -** 9) Flush Instruction and Data caches -** 10) If there is a Translation Lookaside Buffer, Clear the TLB -** 11) Execute initialization code if the IDT/c library is to be used -** -** 12) Jump to user's "main()" -** 13) Jump to promexit -** -** IDT/C 5.x defines _R3000, IDT/C 6.x defines _R4000 internally. -** This is used to mark code specific to R3xxx or R4xxx processors. -** IDT/C 6.x defines __mips to be the ISA level for which we're -** generating code. This is used to make sure the stack etc. is -** double word aligned, when using -mips3 (default) or -mips2, -** when compiling with IDT/C6.x -** -***************************************************************************/ - -FRAME(start,sp,0,ra) - - .set noreorder -#if __mips_fpr == 64 - li v0,SR_CU1|SR_FR /* initally clear ERL, enable FPU with 64 bit regs */ -#else - li v0,SR_CU1 /* initally clear ERL, enable FPU with 32 bit regs */ -#endif - - mtc0 v0,C0_SR /* clr IntMsks/ kernel/disabled mode */ - nop - mtc0 zero,C0_CAUSE /* clear software interrupts */ - nop - - li v0,CFG_C_NONCOHERENT /* initialise default cache mode */ - mtc0 v0,C0_CONFIG - -/* -** check to see if a fpu is really plugged in -*/ - li t3,0xaaaa5555 /* put a's and 5's in t3 */ - mtc1 t3,fp0 /* try to write them into fp0 */ - mtc1 zero,fp1 /* try to write zero in fp */ - mfc1 t0,fp0 - mfc1 t1,fp1 - nop - bne t0,t3,1f /* branch if no match */ - nop - bne t1,zero,1f /* double check for positive id */ - nop - /* We have a FPU. clear fcsr */ - ctc1 zero, fcr31 - j 2f /* status register already correct */ - nop -1: - li v0,0x0 /* clear ERL and disable FPA */ - - mtc0 v0, C0_SR /* reset status register */ -2: - la gp, _gp /* Initialize gp register (pointer to "small" data)*/ - -#if 0 - /* Initialize data sections from "rom" copy */ - la t0,_idata /* address of initialization data (copy of data sections placed in ROM) */ - la t1,_fdata /* start of initialized data section */ - la t2,_edata /* end of initialized data section */ -3: - lw t3,0(t0) - sw t3,0(t1) - addiu t1,t1,4 - bne t1,t2,3b - addiu t0,t0,4 -#endif - - /* clear bss before using it */ - la v0,_fbss /* start of bss */ - la v1,end /* end of bss */ -4: sw zero,0(v0) - bltu v0,v1,4b - add v0,4 - - -/************************************************************************ -** -** Temporary Stack - needed to handle stack saves until -** memory size is determined and permanent stack set -** -** MUST be uncached to avoid confusion at cache -** switching during memory sizing -** -*************************************************************************/ - /* For MIPS 3, we need to be sure that the stack is aligned on a - * double word boundary. - */ - andi t0, v0, 0x7 - beqz t0, 11f /* Last three bits Zero, already aligned */ - nop - add v0, 4 -11: - - or v0, K1BASE /* switch to uncached */ - add v1, v0, TMP_STKSIZE /* end of bss + length of tmp stack */ - sub v1, v1, (4*4) /* overhead */ - move sp, v1 /* set sp to top of stack */ -4: sw zero, 0(v0) - bltu v0, v1, 4b /* clear out temp stack */ - add v0, 4 - -/* jal init_exc_vecs */ /* install exception handlers */ -/* nop */ /* MUST do before memory probes */ - - /* Force processor into uncached space during memory/cache probes */ - la v0, 5f - li v1, K1BASE - or v0, v1 - j v0 - nop -5: - - li a0, HARD_CODED_MEM_SIZE /* Set memory size global */ - jal set_memory_size - nop - - la a0, sim_mem_cfg_struct - jal get_mem_conf /* Make call to get mem size */ - nop - la a0, sim_mem_cfg_struct - lw a0, 0(a0) /* Get memory size from struct */ - - jal config_cache /* determine size of D & I caches */ - nop - - move v0, a0 /* mem_size */ - - /* For MIPS 3, we need to be sure that the stack (and hence v0 - * here) is aligned on a double word boundary. - */ - andi t0, v0, 0x7 - beqz t0, 12f /* Last three bits Zero, already aligned */ - nop - subu v0, 4 /* mem_size was not aligned on doubleword bdry????*/ -12: - - - -/************************************************************************** -** -** Permanent Stack - now know top of memory, put permanent stack there -** -***************************************************************************/ - - la t2, _fbss /* cache mode as linked */ - and t2, 0xF0000000 /* isolate segment */ - la t1, 6f - j t1 /* back to original cache mode */ - nop -6: - or v0, t2 /* stack back to original cache mode */ - addiu v0,v0,-16 /* overhead */ - move sp, v0 /* now replace count w top of memory */ - move v1, v0 - subu v1, P_STACKSIZE /* clear requested stack size */ - -7: sw zero, 0(v1) /* clear P_STACKSIZE stack */ - bltu v1,v0,7b - add v1, 4 - - -/* Invalidate data cache*/ - lui t0, 0x8000 /* Set starting address */ - addi t1, t0, 0x2000 /* Calculate end address (assume worst case of 32 KByte / 4 Way cache) */ - /* D-Cache Writeback and Invalidate */ -1: bge t0, t1, 2f /* if(t0>=end_addr) then exit */ - nop - cache 1, 0(t0) /* Index_Writeback_Inv_D way 0 */ - cache 1, 1(t0) /* Index_Writeback_Inv_D way 1 */ - cache 1, 2(t0) /* Index_Writeback_Inv_D way 2 */ - cache 1, 3(t0) /* Index_Writeback_Inv_D way 3 */ - b 1b - addi t0, t0, 32 -2: - -/* Invalidate instruction cache*/ - lui t0, 0x8000 /* Set starting address */ - addi t1, t0, 0x2000 /* Calculate end address (assume worst case of 32 KByte / 4 Way cache) */ - /* I-Cache Disable */ - mfc0 t2, C0_CONFIG /* get C0_Config */ - lui t3, 0x2 /* C0_CONFIG#17 ICE# */ - or t3, t2, t3 /* set ICE# bit */ - mtc0 t3, C0_CONFIG /* set C_Config */ - b 1f /* stop streaming */ - nop - /* I-Cache Invalidate */ -1: bge t0, t1, 2f /* if(t0>=end_addr) then exit */ - nop - cache 0, 0(t0) /* Index_Invalidate_I way 0 */ - cache 0, 1(t0) /* Index_Invalidate_I way 1 */ - cache 0, 2(t0) /* Index_Invalidate_I way 2 */ - cache 0, 3(t0) /* Index_Invalidate_I way 3 */ - b 1b - addi t0, t0, 32 - /* I-Cache Enable */ -2: mtc0 t2, C0_CONFIG /* set C0_Config */ - nop - -/* Lock first 4k of PMON into instruction cache. This includes interrupt service code which - we don't want to run out of slow flash device. */ - - la t0,0x9fc00000 - li t1, 0x1000 - - move t3, t0 - addu t1, t0, t1 -1: bge t0, t1, 2f - nop - lui t2, 0x1fff /* MASK */ - ori t2, t2, 0xf000 - and t2, t3, t2 /* virtual->physical */ - srl t2, t2, 4 /* [31:12] --> [35:8] */ - ori t2, t2, 0x00c4 /* Set Valid & Lock Bits */ - mtc0 t2, C0_TAGLO /* Load data to TagLo reg. */ - nop - cache 0x08, 3(t0) /* 2(I)=0x08: Index_Store_Tag(I$) Way3*/ - nop - cache 0x14, 3(t0) /* 5(I)=0x14: Fill(Memory->Cache) Way3*/ - b 1b - addi t0, t0, 32 -2: nop - - .set reorder - -/* -** Clear Translation Lookaside Buffer (TLB) -*/ - jal init_tlb /* clear the tlb */ - -/* -** End of CPU initialization, ready to start kernel -*/ - move a0,zero /* Set command line passed to boot_card */ - jal boot_card - nop - -/* Kernel has been shutdown, jump to the "exit" routine */ - jal _sys_exit - move a0,v0 # pass through the exit code - -1: - beq zero,zero,1b - nop - -ENDFRAME(start) - -/* - * _sys_exit -- Exit from the application. Normally we cause a user trap - * to return to the ROM monitor for another run. NOTE: This is - * the only other routine we provide in the crt0.o object, since - * it may be tied to the "_start" routine. It also allows - * executables that contain a complete world to be linked with - * just the crt0.o object. - */ -FRAME(_sys_exit,sp,0,ra) - - break 1023 - nop -13: - b 13b # but loop back just in-case - nop - -ENDFRAME(_sys_exit) - - - - .globl __sizemem - .ent __sizemem -__sizemem: - li v0,HARD_CODED_MEM_SIZE - j ra - nop - .end __sizemem - -- cgit v1.2.3