diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mpc8260ads/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mpc8260ads/start/start.S | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/c/src/lib/libbsp/powerpc/mpc8260ads/start/start.S b/c/src/lib/libbsp/powerpc/mpc8260ads/start/start.S deleted file mode 100644 index 4fdc21cea9..0000000000 --- a/c/src/lib/libbsp/powerpc/mpc8260ads/start/start.S +++ /dev/null @@ -1,168 +0,0 @@ -/* start.S - * - * Modified for the Motorola PQII ADS board by - * Andy Dachs <a.dachs@sstl.co.uk> 23-11-00. - * Surrey Satellite Technology Limited - * - * I have a proprietary bootloader programmed into the flash - * on the board which initialises the SDRAM prior to calling - * this function. - * - * This file is based on the one by Jay Monkman (jmonkman@fracsa.com) - * which in turn was based on the dlentry.s file for the Papyrus BSP, - * written by: - * - * Author: Andrew Bray <andy@i-cubed.co.uk> - * - * COPYRIGHT (c) 1995 by i-cubed ltd. - * - * 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. - * - */ - -#include <rtems/asm.h> - -/* - * The initial stack is set to run BELOW the code base address. - * (between the vectors and text sections) - * - * The entry veneer has to clear the BSS and copy the read only - * version of the data segment to the correct location. - */ - - .section ".entry" /* This might have to be the first thing in the - * text section. At one time, it had to be - * first, but I don't believe it is true - * any more. */ - PUBLIC_VAR (start) -SYM(start): - bl .startup -base_addr: - -/* - * Parameters from linker - */ -toc_pointer: - .long s.got -bss_length: - .long bss.size -bss_addr: - .long bss.start - -PUBLIC_VAR (data_length ) -data_length: - .long data.size -PUBLIC_VAR (data_addr ) -data_addr: - .long data.start - -PUBLIC_VAR (text_addr) -text_addr: - .long text.start - -PUBLIC_VAR (text_length) -text_length: - .long text.size - -/* - * Initialization code - */ -.startup: - /* Get start address */ - mflr r1 - - /* -------------------------------------------------- - * Clear MSR[EE] to disable interrupts - * Clear MSR[IP] bit to put vectors at 0x00000000 - * Set MSR[FP] to enable FPU - not on my eval board! - * -------------------------------------------------- */ - mfmsr r5 - lis r13, 0xFFFF - ori r13, r13, 0x7FBF - and r5, r5, r13 /* Clear EE and IP */ -#if 1 - ori r5, r5, 0x2000 /* Enable FPU */ -#endif - mtmsr r5 - -#ifdef ENABLE_CACHE - /* Enable caches */ - mfspr r5, 1008 - ori r5, r5, 0x8000 - isync - mtspr 1008, r5 - -/* Leave D-cache disabled for now */ -#if 0 - ori r5, r5, 0x4000 - sync - mtspr 1008, r5 -#endif -#endif - - /*-------------------------------------------------- - * Set up the power management modes - * The 8260 has a dynamic power management mode that - * is automatically invoked if the unit is idle. - * We invoke the NAP mode in the RTEMS idle task. - *-------------------------------------------------- */ - - lis r13, 0x0050 /* set nap mode and DPM */ - or r5, r5, r13 - mtspr 1008, r5 - - /*-------------------------------------------------- - * - *-------------------------------------------------- */ - - /* clear the bss section */ - bl bssclr - -/* - * 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 - - /* Clear cmdline */ - xor r3, r3, r3 - - .extern SYM (boot_card) - bl SYM (boot_card) /* call the first C routine */ - - /* we don't expect to return from boot_card but if we do */ - /* wait here for watchdog to kick us into hard reset */ - -twiddle: - b twiddle - -/* - * bssclr - zero out bss - */ -bssclr: - lwz r4, bss_addr-base_addr(r1) /* Start of bss */ - lwz r5, bss_length-base_addr(r1) /* Length of bss */ - - rlwinm. r5,r5,30,0x3FFFFFFF /* form length/4 */ - beqlr /* no bss */ - mtctr r5 /* set ctr reg */ - xor r6,r6,r6 /* r6 = 0 */ -clear_bss: - stswi r6,r4,0x4 /* store r6 */ - addi r4,r4,0x4 /* update r2 */ - - bdnz clear_bss /* dec counter and loop */ - blr /* return */ |