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libubb/physmem.c: new function physmem_flush to flush cached writes to memory
This is mainly a wrapper for the "cacheflush" system call.
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@ -15,7 +15,7 @@ TARGET = mipsel-openwrt-linux-
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CC = $(TARGET)gcc
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LD = $(TARGET)ld
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CFLAGS = -g -Wall -fPIC -Iinclude
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CFLAGS = -g -Wall -fPIC -march=mips32 -Iinclude
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LIB = libubb.a
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SHLIB = libubb.so
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24
libubb/include/ubb/physmem.h
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24
libubb/include/ubb/physmem.h
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@ -0,0 +1,24 @@
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/*
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* physmem.h - Physical memory translator and allocator
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*
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* Written 2013 by Werner Almesberger
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* Copyright 2013 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef UBB_PHYSMEM_H
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#define UBB_PHYSMEM_H
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#include <sys/types.h>
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void *physmem_malloc(size_t size);
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void *physmem_calloc(size_t size);
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unsigned long physmem_xlat(void *v);
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int physmem_flush(const void *data, size_t size);
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#endif /* !UBB_PHYSMEM_H */
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@ -19,6 +19,7 @@
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <asm/cachectl.h>
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#include <ubb/physmem.h>
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@ -34,6 +35,9 @@
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#define ALIGN 32 /* DMA transfer size */
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extern int cacheflush(char *addr, int nbytes, int cache);
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static void *align_brk(int alignment)
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{
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void *initial;
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@ -138,3 +142,12 @@ unsigned long physmem_xlat(void *v)
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close(fd);
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return res;
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}
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int physmem_flush(const void *v, size_t size)
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{
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if (cacheflush((void *) v, size, DCACHE))
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return -1;
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asm("sync"); /* flush the write buffer */
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return 0;
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}
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