105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
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/* Copyright (C) 2005 David Decotigny
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#include <crt.h>
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#include <libc.h>
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#include <string.h>
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#include <stdarg.h>
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#include <debug.h>
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/**
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* @file myprog12.c
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*
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* /dev/mem & /dev/kmem tests
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*/
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int main(void)
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{
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char *zoup;
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/* Test /dev/mem */
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/* Map the x86 text framebuffer into this process address space in
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shared mode */
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int fd;
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fd = open("/dev/mem", O_RDWR);
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zoup = mmap(0, 4096, PROT_READ | PROT_WRITE,
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MAP_SHARED,
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fd, 0xb8000);
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close(fd);
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bochs_printf("mapped mem @%x\n", (unsigned)zoup);
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_sos_syscall1(4004, (unsigned)"Apres mmap video");
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/* Do some forks to complicate things */
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fork();
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fork();
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/* Write a string into it: it should be printed on screen */
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strzcpy(zoup + 80*5*2 + 10*2,
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"H e l l o W o r l d f r o m S O S i n U s e r M o d e ",
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250);
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/* Map the x86 text framebuffer into this process address space in
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PRIVATE mode */
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fd = open("/dev/mem", O_RDWR);
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zoup = mmap(0, 4096, PROT_READ | PROT_WRITE,
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0 /* Private */,
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fd, 0xb8000);
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close(fd);
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bochs_printf("mapped mem @%x\n", (unsigned)zoup);
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_sos_syscall1(4004, (unsigned)"Apres mmap video");
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/* Do some forks to complicate things */
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fork();
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fork();
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/* Write a string into it: it should NOT be printed on screen since
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the mapping is private */
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strzcpy(zoup + 80*5*2 + 10*2,
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"Y o u c a n n o t S e e T h i s ! ",
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250);
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/* Test /dev/kmem */
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/* remap some kernel pages in user space. We'd better map this in
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"private" mode here, this way we can do whatever we like in this
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area. If we'd mapped it read/write, this would overwrite kernel
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data/code, causing a crash sooner or later. */
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fd = open("/dev/kmem", O_RDWR);
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zoup = mmap(0, 100*4096, PROT_READ | PROT_WRITE,
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0 /* private */,
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fd, 0x00201000);
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close(fd);
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bochs_printf("mapped kmem @%x\n", (unsigned)zoup);
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_sos_syscall1(4004, (unsigned)"Apres mmap kernel");
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/* Do some forks to complicate things */
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fork();
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fork();
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/* Overwriting our private "copy" of kernel */
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memset(zoup, 0x0, 10*4096);
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_sos_syscall1(4004, (unsigned)"Apres memset kernel");
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return 0;
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}
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