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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 myprog12.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(void) 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 zoup = fakemmap(0, 4096, PROT_READ | PROT_WR !! 041 int fd; 042 MAP_SHARED, !! 042 043 "/dev/mem", 0xb8000); !! 043 fd = open("/dev/mem", O_RDWR); >> 044 zoup = mmap(0, 4096, PROT_READ | PROT_WRITE, >> 045 MAP_SHARED, >> 046 fd, 0xb8000); >> 047 close(fd); >> 048 044 bochs_printf("mapped mem @%x\n", (unsigned)z 049 bochs_printf("mapped mem @%x\n", (unsigned)zoup); 045 _sos_syscall1(4004, (unsigned)"Apres mmap vi 050 _sos_syscall1(4004, (unsigned)"Apres mmap video"); 046 051 047 /* Do some forks to complicate things */ 052 /* Do some forks to complicate things */ 048 fork(); 053 fork(); 049 fork(); 054 fork(); 050 055 051 /* Write a string into it: it should be prin 056 /* Write a string into it: it should be printed on screen */ 052 strzcpy(zoup + 80*5*2 + 10*2, 057 strzcpy(zoup + 80*5*2 + 10*2, 053 "H e l l o W o r l d f r o m S 058 "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 ", 054 250); 059 250); 055 060 056 /* Map the x86 text framebuffer into this pr 061 /* Map the x86 text framebuffer into this process address space in 057 PRIVATE mode */ 062 PRIVATE mode */ 058 zoup = fakemmap(0, 4096, PROT_READ | PROT_WR !! 063 fd = open("/dev/mem", O_RDWR); 059 0 /* Private */, !! 064 zoup = mmap(0, 4096, PROT_READ | PROT_WRITE, 060 "/dev/mem", 0xb8000); !! 065 0 /* Private */, >> 066 fd, 0xb8000); >> 067 close(fd); 061 bochs_printf("mapped mem @%x\n", (unsigned)z 068 bochs_printf("mapped mem @%x\n", (unsigned)zoup); 062 _sos_syscall1(4004, (unsigned)"Apres mmap vi 069 _sos_syscall1(4004, (unsigned)"Apres mmap video"); 063 070 064 /* Do some forks to complicate things */ 071 /* Do some forks to complicate things */ 065 fork(); 072 fork(); 066 fork(); 073 fork(); 067 074 068 /* Write a string into it: it should NOT be 075 /* Write a string into it: it should NOT be printed on screen since 069 the mapping is private */ 076 the mapping is private */ 070 strzcpy(zoup + 80*5*2 + 10*2, 077 strzcpy(zoup + 80*5*2 + 10*2, 071 "Y o u c a n n o t S e e T h i 078 "Y o u c a n n o t S e e T h i s ! ", 072 250); 079 250); 073 080 074 /* Test /dev/kmem */ 081 /* Test /dev/kmem */ 075 082 076 /* remap some kernel pages in user space. We 083 /* remap some kernel pages in user space. We'd better map this in 077 "private" mode here, this way we can do w 084 "private" mode here, this way we can do whatever we like in this 078 area. If we'd mapped it read/write, this 085 area. If we'd mapped it read/write, this would overwrite kernel 079 data/code, causing a crash sooner or late 086 data/code, causing a crash sooner or later. */ 080 zoup = fakemmap(0, 100*4096, PROT_READ | PRO !! 087 fd = open("/dev/kmem", O_RDWR); 081 0 /* private */, !! 088 zoup = mmap(0, 100*4096, PROT_READ | PROT_WRITE, 082 "/dev/kmem", 0x00201000); !! 089 0 /* private */, >> 090 fd, 0x00201000); >> 091 close(fd); 083 bochs_printf("mapped kmem @%x\n", (unsigned) 092 bochs_printf("mapped kmem @%x\n", (unsigned)zoup); 084 _sos_syscall1(4004, (unsigned)"Apres mmap ke 093 _sos_syscall1(4004, (unsigned)"Apres mmap kernel"); 085 094 086 /* Do some forks to complicate things */ 095 /* Do some forks to complicate things */ 087 fork(); 096 fork(); 088 fork(); 097 fork(); 089 098 090 /* Overwriting our private "copy" of kernel 099 /* Overwriting our private "copy" of kernel */ 091 memset(zoup, 0x0, 10*4096); 100 memset(zoup, 0x0, 10*4096); 092 _sos_syscall1(4004, (unsigned)"Apres memset 101 _sos_syscall1(4004, (unsigned)"Apres memset kernel"); 093 102 094 return 0; 103 return 0; 095 } 104 }
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