forked from Imagelibrary/rtems
2010-12-29 Sebastian Huber <sebastian.huber@embedded-brains.de>
* shared/include/start.h, shared/src/bsp-start-zero.S: New files.
This commit is contained in:
Sebastian Huber
@@ -1,3 +1,7 @@
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2010-12-29 Sebastian Huber <sebastian.huber@embedded-brains.de>
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* shared/include/start.h, shared/src/bsp-start-zero.S: New files.
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2010-08-25 Till Straumann <strauman@slac.stanford.edu>
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PR 1689/bsps
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86
c/src/lib/libbsp/powerpc/shared/include/start.h
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86
c/src/lib/libbsp/powerpc/shared/include/start.h
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@@ -0,0 +1,86 @@
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/**
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* @file
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*
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* @ingroup bsp_start
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*
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* @brief System low level start.
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*/
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/*
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* Copyright (c) 2010 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#ifndef LIBBSP_POWERPC_SHARED_START_H
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#define LIBBSP_POWERPC_SHARED_START_H
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @defgroup bsp_start System Start
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*
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* @ingroup bsp_kit
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*
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* @brief System low level start.
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*
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* @{
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*/
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#define BSP_START_TEXT_SECTION __attribute__((section(".bsp_start_text")))
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#define BSP_START_DATA_SECTION __attribute__((section(".bsp_start_data")))
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/**
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* @brief System start entry.
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*/
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void _start(void);
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/**
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* Zeros @a byte_count bytes starting at @a begin.
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*
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* It wraps around in case of an address overflow. The stack will not be used.
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* The code is position independent. It uses the data cache block zero
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* instruction in case the data cache is enabled. There are no alignment
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* constains for @a begin and @a byte_count.
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*
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* @see bsp_start_zero_begin, bsp_start_zero_end, and bsp_start_zero_size.
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*/
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void BSP_START_TEXT_SECTION bsp_start_zero(void *begin, size_t byte_count);
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/**
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* @brief Symbol which equals the bsp_start_zero() code begin.
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*/
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extern char bsp_start_zero_begin [];
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/**
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* @brief Symbol which equals the bsp_start_zero() code end.
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*/
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extern char bsp_start_zero_end [];
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/**
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* @brief Symbol which equals the bsp_start_zero() code size.
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*/
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extern char bsp_start_zero_size [];
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/** @} */
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* LIBBSP_POWERPC_SHARED_START_H */
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102
c/src/lib/libbsp/powerpc/shared/src/bsp-start-zero.S
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102
c/src/lib/libbsp/powerpc/shared/src/bsp-start-zero.S
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@@ -0,0 +1,102 @@
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/**
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* @file
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*
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* @ingroup bsp_start
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*
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* @brief bsp_start_zero() implementation.
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*/
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/*
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* Copyright (c) 2010 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#include <rtems/asm.h>
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#include <bspopts.h>
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.globl bsp_start_zero
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.globl bsp_start_zero_begin
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.globl bsp_start_zero_end
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.globl bsp_start_zero_size
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.section ".bsp_start_text", "ax"
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.type bsp_start_zero, @function
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bsp_start_zero:
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bsp_start_zero_begin:
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li r0, 0
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subi r11, r3, 1
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clrrwi r11, r11, 5
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addi r10, r11, 32
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subf r11, r3, r10
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cmplw cr7, r11, r4
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add r9, r3, r4
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ble- cr7, head_end_done
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mr r10, r9
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head_end_done:
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subf r11, r3, r10
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addi r11, r11, 1
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mtctr r11
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/* Head loop */
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b head_loop_update
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head_loop_begin:
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stb r0, 0(r3)
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addi r3, r3, 1
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head_loop_update:
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bdnz+ head_loop_begin
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subf r11, r3, r9
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srwi r11, r11, 5
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addi r11, r11, 1
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mtctr r11
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/* Main loop */
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b main_loop_update
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main_loop_begin:
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#ifdef DATA_CACHE_ENABLE
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dcbz r0, r3
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dcbf r0, r3
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#else
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stw r0, 0(r3)
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stw r0, 4(r3)
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stw r0, 8(r3)
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stw r0, 12(r3)
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stw r0, 16(r3)
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stw r0, 20(r3)
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stw r0, 24(r3)
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stw r0, 28(r3)
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#endif
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addi r3, r3, 32
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main_loop_update:
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bdnz+ main_loop_begin
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subf r9, r3, r9
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addi r9, r9, 1
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mtctr r9
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/* Tail loop */
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b tail_loop_update
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tail_loop_begin:
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stb r0, 0(r3)
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addi r3, r3, 1
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tail_loop_update:
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bdnz+ tail_loop_begin
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/* Return */
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sync
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isync
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blr
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bsp_start_zero_end:
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.set bsp_start_zero_size, bsp_start_zero_end - bsp_start_zero_begin
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