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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <crt.h> 019 #include <crt.h> 020 #include <libc.h> 020 #include <libc.h> 021 #include <string.h> 021 #include <string.h> 022 #include <stdarg.h> 022 #include <stdarg.h> 023 #include <debug.h> 023 #include <debug.h> 024 024 025 025 026 /** 026 /** 027 * @file myprog12.c !! 027 * @file myprog10.c 028 * 028 * 029 * /dev/mem & /dev/kmem tests 029 * /dev/mem & /dev/kmem tests 030 */ 030 */ 031 031 032 032 033 int main() 033 int main() 034 { 034 { 035 char *zoup; 035 char *zoup; 036 036 037 /* Test /dev/mem */ 037 /* Test /dev/mem */ 038 038 039 /* Map the x86 text framebuffer into this pr 039 /* Map the x86 text framebuffer into this process address space in 040 shared mode */ 040 shared mode */ 041 int fd; << 042 << 043 fd = open("/dev/mem", O_RDWR); << 044 zoup = mmap(0, 4096, PROT_READ | PROT_WRITE, 041 zoup = mmap(0, 4096, PROT_READ | PROT_WRITE, 045 MAP_SHARED, 042 MAP_SHARED, 046 fd, 0xb8000); !! 043 "/dev/mem", 0xb8000); 047 close(fd); << 048 << 049 bochs_printf("mapped mem @%x\n", (unsigned)z 044 bochs_printf("mapped mem @%x\n", (unsigned)zoup); 050 _sos_syscall1(4004, (unsigned)"Apres mmap vi 045 _sos_syscall1(4004, (unsigned)"Apres mmap video"); 051 046 052 /* Do some forks to complicate things */ 047 /* Do some forks to complicate things */ 053 fork(); 048 fork(); 054 fork(); 049 fork(); 055 050 056 /* Write a string into it: it should be prin 051 /* Write a string into it: it should be printed on screen */ 057 strzcpy(zoup + 80*5*2 + 10*2, 052 strzcpy(zoup + 80*5*2 + 10*2, 058 "H e l l o W o r l d f r o m S 053 "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 ", 059 250); 054 250); 060 055 061 /* Map the x86 text framebuffer into this pr 056 /* Map the x86 text framebuffer into this process address space in 062 PRIVATE mode */ 057 PRIVATE mode */ 063 fd = open("/dev/mem", O_RDWR); << 064 zoup = mmap(0, 4096, PROT_READ | PROT_WRITE, 058 zoup = mmap(0, 4096, PROT_READ | PROT_WRITE, 065 0 /* Private */, 059 0 /* Private */, 066 fd, 0xb8000); !! 060 "/dev/mem", 0xb8000); 067 close(fd); << 068 bochs_printf("mapped mem @%x\n", (unsigned)z 061 bochs_printf("mapped mem @%x\n", (unsigned)zoup); 069 _sos_syscall1(4004, (unsigned)"Apres mmap vi 062 _sos_syscall1(4004, (unsigned)"Apres mmap video"); 070 063 071 /* Do some forks to complicate things */ 064 /* Do some forks to complicate things */ 072 fork(); 065 fork(); 073 fork(); 066 fork(); 074 067 075 /* Write a string into it: it should NOT be 068 /* Write a string into it: it should NOT be printed on screen since 076 the mapping is private */ 069 the mapping is private */ 077 strzcpy(zoup + 80*5*2 + 10*2, 070 strzcpy(zoup + 80*5*2 + 10*2, 078 "Y o u c a n n o t S e e T h i 071 "Y o u c a n n o t S e e T h i s ! ", 079 250); 072 250); 080 073 081 /* Test /dev/kmem */ 074 /* Test /dev/kmem */ 082 075 083 /* remap some kernel pages in user space. We 076 /* remap some kernel pages in user space. We'd better map this in 084 "private" mode here, this way we can do w 077 "private" mode here, this way we can do whatever we like in this 085 area. If we'd mapped it read/write, this 078 area. If we'd mapped it read/write, this would overwrite kernel 086 data/code, causing a crash sooner or late 079 data/code, causing a crash sooner or later. */ 087 fd = open("/dev/kmem", O_RDWR); << 088 zoup = mmap(0, 100*4096, PROT_READ | PROT_WR 080 zoup = mmap(0, 100*4096, PROT_READ | PROT_WRITE, 089 0 /* private */, 081 0 /* private */, 090 fd, 0x00201000); !! 082 "/dev/kmem", 0x00201000); 091 close(fd); << 092 bochs_printf("mapped kmem @%x\n", (unsigned) 083 bochs_printf("mapped kmem @%x\n", (unsigned)zoup); 093 _sos_syscall1(4004, (unsigned)"Apres mmap ke 084 _sos_syscall1(4004, (unsigned)"Apres mmap kernel"); 094 085 095 /* Do some forks to complicate things */ 086 /* Do some forks to complicate things */ 096 fork(); 087 fork(); 097 fork(); 088 fork(); 098 089 099 /* Overwriting our private "copy" of kernel 090 /* Overwriting our private "copy" of kernel */ 100 memset(zoup, 0x0, 10*4096); 091 memset(zoup, 0x0, 10*4096); 101 _sos_syscall1(4004, (unsigned)"Apres memset 092 _sos_syscall1(4004, (unsigned)"Apres memset kernel"); 102 093 103 return 0; 094 return 0; 104 } 095 }
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