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/*
ARM icache flush support using Linux syscall.
Copyright (C) 2000,2008 Free Software Foundation, Inc.
This file is part of Gforth.
Gforth 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, USA.
*/
#include <stddef.h>
void cacheflush(void *p, size_t size)
{
/* For details, please see the Linux sources, files
* arch/arm/kernel/traps.c, arch/arm/kernel/entry-common.S and
* asm-arm/unistd.h
*
* This syscall is supported by all 2.4 and 2.6 Linux kernels. 2.2 linux
* kernels got first support with version 2.2.18.
*/
asm("mov r0, %0\n"
"mov r1, %1\n"
"mov r2, #0\n"
# if defined (__thumb__)
/* Thumb syscall, either EABI or OABI, syscall number is passed in
* 'r7'. Note that Thumb EABI and OABI are generally not the same. It
* just happens that the simple cacheflush syscall doesn't expose any
* of differences in calling conventions. */
"mov r7, #0xf\n\t" /* Thumb mode only allows 8-bit constants */
"lsl r7, #16\n\t"
"add r7, #0x2\n\t"
"swi #0\n\t"
# elif defined (__ARM_EABI__)
/* EABI non-Thumb syscall: syscall number passed in 'r7' (syscall base
* number is 0x0).
*/
"mov r7, #0xf0000\n\t" /* only shifted 8-bit constants allowed */
"orr r7, r7, #0x00002\n\t"
"swi #0\n\t"
# else
/* OABI non-Thumb syscall: syscall number passed as part of 'swi'
* instruction, base number is 0x900000 */
"swi #0x9f0002\n"
# endif
:: "r"(p), "r"((long)p+size) :
"r0", "r1", "r2", "r7");
}
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