From mboxrd@z Thu Jan 1 00:00:00 1970 From: Magnus Lilja Date: Sat, 13 Jun 2009 20:50:02 +0200 Subject: [U-Boot] [PATCH v4 3/6] ARM: Add macros.h to be used in assembler file. In-Reply-To: References: <4a62b27ae616d894b9302d1b73a3e4a71bbdfbf1.1244918138.git.lilja.magnus@gmail.com> Message-ID: <6fd22327241accc2efcada8380923c8e9c523790.1244918138.git.lilja.magnus@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de From: Jean-Christophe PLAGNIOL-VILLARD Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- Changes from last version: Added documentation for the macros. include/asm-arm/macro.h | 74 +++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 74 insertions(+), 0 deletions(-) create mode 100644 include/asm-arm/macro.h diff --git a/include/asm-arm/macro.h b/include/asm-arm/macro.h new file mode 100644 index 0000000..57b5260 --- /dev/null +++ b/include/asm-arm/macro.h @@ -0,0 +1,74 @@ +/* + * include/asm-arm/macro.h + * + * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD + * + * 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 + */ + +#ifndef __ASM_ARM_MACRO_H__ +#define __ASM_ARM_MACRO_H__ +#ifdef __ASSEMBLY__ + +/* + * These macros provide a convenient way to write 8, 16 and 32 bit data + * to any address. + * Registers r4 and r5 are used, any data in these registers are + * overwritten by the macros. + * The macros are valid for any ARM architecture, they do not implement + * any memory barriers so caution is recommended when using these when the + * caches are enabled or on a multi-core system. + */ + +.macro write32, addr, data + ldr r4, =\addr + ldr r5, =\data + str r5, [r4] +.endm + +.macro write16, addr, data + ldr r4, =\addr + ldrh r5, =\data + strh r5, [r4] +.endm + +.macro write8, addr, data + ldr r4, =\addr + ldrb r5, =\data + strb r5, [r4] +.endm + +/* + * This macro generates a loop that can be used for delays in the code. + * Register r4 is used, any data in this register is overwritten by the + * macro. + * The macro is valid for any ARM architeture. The actual time spent in the + * loop will vary from CPU to CPU though. + */ + +.macro wait_timer, time + ldr r4, =\time +1: + nop + subs r4, r4, #1 + bcs 1b +.endm + +#endif /* __ASSEMBLY__ */ +#endif /* __ASM_ARM_MACRO_H__ */ -- 1.5.6