diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mbx8xx/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mbx8xx/start/start.S | 434 |
1 files changed, 0 insertions, 434 deletions
diff --git a/c/src/lib/libbsp/powerpc/mbx8xx/start/start.S b/c/src/lib/libbsp/powerpc/mbx8xx/start/start.S deleted file mode 100644 index 380a24d330..0000000000 --- a/c/src/lib/libbsp/powerpc/mbx8xx/start/start.S +++ /dev/null @@ -1,434 +0,0 @@ -/* start.S - * - * This file contains the entry veneer for RTEMS programs - * on the MBX8xx board. - * It jumps to the BSP which is responsible for performing - * all remaining initialization. - * - * This file is based on several others: - * - * (1) start360.s from the gen68360 BSP by - * W. Eric Norum (eric@skatter.usask.ca) - * with the following copyright and license: - * - * COPYRIGHT (c) 1989-1998. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may in - * the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - * - * (2) start.s for the eth_comm port by - * Jay Monkman (jmonkman@fracsa.com), - * which itself is based on the - * - * (3) dlentry.s for the Papyrus BSP, written by: - * Andrew Bray <andy@i-cubed.co.uk> - * with the following copyright and license: - * - * COPYRIGHT (c) 1995 by i-cubed ltd. - * - * (4) start860.S for the MBX821/MBX860, written by: - * Darlene A. Stewart <darlene.stewart@iit.nrc.ca> - * Copyright (c) 1999, National Research Council of Canada - * - * To anyone who acknowledges that this file is provided "AS IS" - * without any express or implied warranty: - * permission to use, copy, modify, and distribute this file - * for any purpose is hereby granted without fee, provided that - * the above copyright notice and this notice appears in all - * copies, and that the name of i-cubed limited not be used in - * advertising or publicity pertaining to distribution of the - * software without specific, written prior permission. - * i-cubed limited makes no representations about the suitability - * of this software for any purpose. - * - * Modifications (for MBX8xx) of respective RTEMS files: - * Copyright (c) 1999, National Research Council of Canada - */ - -#include <rtems/asm.h> - -/* - * The initial stack is set to run BELOW the code base address. - * (between the vectors and text sections) - * - * All the entry veneer has to do is to clear the BSS. - */ - -/* - * GDB likes to have debugging information for the entry veneer. - * Play compiler and provide some DWARF information. - * - * CHANGE TO SUIT YOUR SETUP! - */ - - .section .entry,"ax",@progbits -.L_text_b: -.L_LC1: - .previous - -.section .debug_sfnames -.L_sfnames_b: - .byte "rtems/c/src/lib/libbsp/powerpc/mbx8xx/startup/" - .byte 0 -.L_F0: - .byte "start.S" - .byte 0 - .previous - -.section .line -.L_line_b: - .4byte .L_line_e-.L_line_b - .4byte .L_text_b -.L_LE1: -.L_line_last: - .4byte 0x0 - .2byte 0xffff - .4byte .L_text_e-.L_text_b -.L_line_e: - .previous - -.section .debug_srcinfo -.L_srcinfo_b: - .4byte .L_line_b - .4byte .L_sfnames_b - .4byte .L_text_b - .4byte .L_text_e - .4byte 0xffffffff - .4byte .L_LE1-.L_line_b - .4byte .L_F0-.L_sfnames_b - .4byte .L_line_last-.L_line_b - .4byte 0xffffffff - .previous - -.section .debug_pubnames - .4byte .L_debug_b - .4byte .L_P0 - .byte "start" - .byte 0 - .4byte 0x0 - .byte 0 - .previous - -.section .debug_aranges - .4byte .L_debug_b - .4byte .L_text_b - .4byte .L_text_e-.L_text_b - .4byte 0 - .4byte 0 - .4byte 0 - .4byte 0 - .4byte 0 - .4byte 0 - .4byte 0x0 - .4byte 0x0 - .previous - -.section .debug -.L_debug_b: -.L_D1: - .4byte .L_D1_e-.L_D1 - .2byte 0x11 /* TAG_compile_unit */ - .2byte 0x12 /* AT_sibling */ - .4byte .L_D2 - .2byte 0x38 /* AT_name */ - .byte "start.S" - .byte 0 - .2byte 0x258 /* AT_producer */ - .byte "GAS 2.5.2" - .byte 0 - .2byte 0x111 /* AT_low_pc */ - .4byte .L_text_b - .2byte 0x121 /* AT_high_pc */ - .4byte .L_text_e - .2byte 0x106 /* AT_stmt_list */ - .4byte .L_line_b - .2byte 0x1b8 /* AT_comp_dir */ - .byte "rtems/c/src/lib/libbsp/powerpc/mbx8xx/startup/" - .byte 0 - .2byte 0x8006 /* AT_sf_names */ - .4byte .L_sfnames_b - .2byte 0x8016 /* AT_src_info */ - .4byte .L_srcinfo_b -.L_D1_e: -.L_P0: -.L_D3: - .4byte .L_D3_e-.L_D3 - .2byte 0x6 /* TAG_global_subroutine */ - .2byte 0x12 /* AT_sibling */ - .4byte .L_D4 - .2byte 0x38 /* AT_name */ - .byte "start" - .byte 0 - .2byte 0x278 /* AT_prototyped */ - .byte 0 - .2byte 0x111 /* AT_low_pc */ - .4byte .L_text_b - .2byte 0x121 /* AT_high_pc */ - .4byte .L_text_e - .2byte 0x8041 /* AT_body_begin */ - .4byte .L_text_b - .2byte 0x8051 /* AT_body_end */ - .4byte .L_text_e -.L_D3_e: - -.L_D4: - .4byte .L_D4_e-.L_D4 - .align 2 -.L_D4_e: -.L_D2: - .previous - -/* - * Tell C's eabi-ctor's that we have an atexit function, - * and that it is to register __do_global_dtors. - */ - EXTERN_PROC(atexit) - PUBLIC_VAR(__atexit) - .section ".sdata","aw" - .align 2 -SYM(__atexit): - EXT_PROC_REF(atexit)@fixup - .previous - - .section ".fixup","aw" - .align 2 - EXT_SYM_REF(__atexit) - .previous - -/* That should do it */ - -/* - * Put the entry point in its own section. That way, we can guarantee - * to put it first in the .text section in the linker script. - */ - .section .entry - - PUBLIC_VAR (_start) -SYM(_start): - bl .startup /* or bl .spin */ -base_addr: - -/* - * Parameters from linker - */ -toc_pointer: - .long __GOT_START__ -bss_length: - .long bss.size -bss_addr: - .long bss.start - -PUBLIC_VAR (text_addr) -text_addr: - .long text.start - -PUBLIC_VAR (text_length) -text_length: - .long text.size - -/* - * Spin, if necessary, to acquire control from debugger (CodeWarrior). - */ -spin: - .long 0x0001 -.spin: - lis r3, spin@ha - lwz r3, spin@l(r3) - cmpwi r3, 0x1 - beq .spin -/* - * test function: blink orange led once - */ -#define LEDBLINK_DELAY (5*1000*1000) -#define LEDPORT 0xFA100001 -#define LEDMASK 0xf0 -#define LEDON 0x00 -#define LEDOFF 0x08 - - PUBLIC_VAR(ledblink) -SYM(ledblink): - lis r3,LEDBLINK_DELAY>>16 -ledblink1: - subi r3,r3,1 - cmpi 0,1,r3,0 - bne ledblink1 - /* - * turn orange led off - */ - lis r3,LEDPORT@ha - lbz r0,LEDPORT@l(r3) - andi. r0,r0,LEDMASK - ori r0,r0,LEDOFF - stb r0,LEDPORT@l(r3) - - lis r3,LEDBLINK_DELAY>>16 -ledblink2: - subi r3,r3,1 - cmpi 0,1,r3,0 - bne ledblink2 - /* - * turn orange led on - */ - lis r3,LEDPORT@ha - lbz r0,LEDPORT@l(r3) - andi. r0,r0,LEDMASK - ori r0,r0,LEDON - stb r0,LEDPORT@l(r3) - - blr -/* - * #define LOADED_BY_EPPCBUG - */ -#define LOADED_BY_EPPCBUG -#define EARLY_CONSOLE -/* - * Initialization code - */ -.startup: - /* Get the start address. */ - mflr r1 -#ifdef LOADED_BY_EPPCBUG - /* Save pointer to residual/board data */ - lis r9,eppcbugInfo@ha - stw r3,eppcbugInfo@l(r9) -#endif - /* Initialize essential registers. */ - bl initregs - nop - - /* - * C_setup. - */ - - /* set toc */ - lwz r2, toc_pointer-base_addr(r1) - - /* Set up stack pointer = beginning of text section - 56 */ - addi r1, r1, -56-4 - - /* Initialize the memory mapped MPC821 registers (done in C). */ - EXTERN_PROC (_InitMBX8xx) - bl PROC (_InitMBX8xx) - nop - - /* Clear the bss section. */ - bl bssclr - nop -#if defined(EARLY_CONSOLE) && defined(LOADED_BY_EPPCBUG) - EXTERN_PROC (serial_init) - bl PROC (serial_init) -#endif - lis r5,environ@ha - la r5,environ@l(r5) /* environp */ - /* clear argc command line */ - xor r3, r3, r3 - - EXTERN_PROC (boot_card) - bl PROC (boot_card) /* call the first C routine */ - nop - - /* we should never return from boot_card, but in case we do ... */ - /* The next instructions are dependent on your runtime environment */ - - /* Return to EPPCBug */ - lis r10, 0x0400 /* Data cache disable */ - mtspr 568, r10 - isync - - mtspr 560, r10 /* Instruction cache disable */ - isync - -stop_here: - li r10, 0x0F00 /* .RETURN */ - sc - - b stop_here - nop - -/* - * bssclr - zero out bss - */ -bssclr: - lis r3, base_addr@ha - addi r3, r3, base_addr@l - lwz r4, bss_addr-base_addr(r3) /* Start of bss */ - lwz r5, bss_length-base_addr(r3) /* Length of bss */ - - rlwinm. r5,r5,30,0x3FFFFFFF /* form length/4 */ - beqlr /* no bss - return */ - mtctr r5 /* set ctr reg */ - - li r5,0x0000 /* r5 = 0 */ -clear_bss: - stw r5,0(r4) /* store r6 */ - addi r4,r4,0x4 /* update r4 */ - bdnz clear_bss /* dec counter and loop */ - - blr /* return */ - -/* - * initregs - * Initialize the MSR and basic core PowerPC registers - * - * Register usage: - * r0 - scratch - */ -initregs: - /* - * Disable address translation. We should already be running in real space, - * so this should be a no-op, i.e. no need to switch instruction stream - * addresses from virtual space to real space. Other bits set the processor - * for big-endian mode, exceptions vectored to 0x000n_nnnn (vectors are - * already in low memory!), no execution tracing, machine check exceptions - * enabled, floating-point not available (MPC8xx has none), supervisor - * priviledge level, external interrupts disabled, power management - * disabled (normal operation mode). - */ - li r0, 0x1000 /* MSR_ME */ - mtmsr r0 /* Context-synchronizing */ - isync - - /* - * Clear the exception handling registers. - * Note SPRG3 is reserved for use by EPPCBug on the MBX8xx. - */ - li r0, 0x0000 - mtdar r0 - mtspr sprg0, r0 - mtspr sprg1, r0 - mtspr sprg2, r0 - mtspr srr0, r0 - mtspr srr1, r0 - - mr r6, r0 - mr r7, r0 - mr r8, r0 - mr r9, r0 - mr r10, r0 - mr r11, r0 - mr r12, r0 - mr r13, r0 - mr r14, r0 - mr r15, r0 - mr r16, r0 - mr r17, r0 - mr r18, r0 - mr r19, r0 - mr r20, r0 - mr r21, r0 - mr r22, r0 - mr r23, r0 - mr r24, r0 - mr r25, r0 - mr r26, r0 - mr r27, r0 - mr r28, r0 - mr r29, r0 - mr r30, r0 - mr r31, r0 - - blr /* return */ - -.L_text_e: |