diff options
Diffstat (limited to 'kernel/ioport.c')
| -rw-r--r-- | kernel/ioport.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/kernel/ioport.c b/kernel/ioport.c deleted file mode 100644 index c61690e3c..000000000 --- a/kernel/ioport.c +++ /dev/null @@ -1,194 +0,0 @@ -/* - * linux/kernel/ioport.c - * - * This contains the io-permission bitmap code - written by obz, with changes - * by Linus. - */ - -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/types.h> -#include <linux/ioport.h> - -static unsigned long ioport_registrar[IO_BITMAP_SIZE] = {0, /* ... */}; - -#define _IODEBUG - -#ifdef IODEBUG -static char * ios(unsigned long l) -{ - static char str[33] = { '\0' }; - int i; - unsigned long mask; - - for (i = 0, mask = 0x80000000; i < 32; ++i, mask >>= 1) - str[i] = (l & mask) ? '1' : '0'; - return str; -} - -static void dump_io_bitmap(void) -{ - int i, j; - int numl = sizeof(current->tss.io_bitmap) >> 2; - - for (i = j = 0; j < numl; ++i) - { - printk("%4d [%3x]: ", 64*i, 64*i); - printk("%s ", ios(current->tss.io_bitmap[j++])); - if (j < numl) - printk("%s", ios(current->tss.io_bitmap[j++])); - printk("\n"); - } -} -#endif - -/* Set EXTENT bits starting at BASE in BITMAP to value TURN_ON. */ -asmlinkage void set_bitmap(unsigned long *bitmap, - short base, short extent, int new_value) -{ - int mask; - unsigned long *bitmap_base = bitmap + (base >> 5); - unsigned short low_index = base & 0x1f; - int length = low_index + extent; - - if (low_index != 0) { - mask = (~0 << low_index); - if (length < 32) - mask &= ~(~0 << length); - if (new_value) - *bitmap_base++ |= mask; - else - *bitmap_base++ &= ~mask; - length -= 32; - } - - mask = (new_value ? ~0 : 0); - while (length >= 32) { - *bitmap_base++ = mask; - length -= 32; - } - - if (length > 0) { - mask = ~(~0 << length); - if (new_value) - *bitmap_base++ |= mask; - else - *bitmap_base++ &= ~mask; - } -} - -/* Check for set bits in BITMAP starting at BASE, going to EXTENT. */ -asmlinkage int check_bitmap(unsigned long *bitmap, short base, short extent) -{ - int mask; - unsigned long *bitmap_base = bitmap + (base >> 5); - unsigned short low_index = base & 0x1f; - int length = low_index + extent; - - if (low_index != 0) { - mask = (~0 << low_index); - if (length < 32) - mask &= ~(~0 << length); - if (*bitmap_base++ & mask) - return 1; - length -= 32; - } - while (length >= 32) { - if (*bitmap_base++ != 0) - return 1; - length -= 32; - } - - if (length > 0) { - mask = ~(~0 << length); - if (*bitmap_base++ & mask) - return 1; - } - return 0; -} - -/* - * this changes the io permissions bitmap in the current task. - */ -asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int turn_on) -{ - if (from + num <= from) - return -EINVAL; - if (from + num > IO_BITMAP_SIZE*32) - return -EINVAL; - if (!suser()) - return -EPERM; - -#ifdef IODEBUG - printk("io: from=%d num=%d %s\n", from, num, (turn_on ? "on" : "off")); -#endif - set_bitmap((unsigned long *)current->tss.io_bitmap, from, num, !turn_on); - return 0; -} - -unsigned int *stack; - -/* - * sys_iopl has to be used when you want to access the IO ports - * beyond the 0x3ff range: to get the full 65536 ports bitmapped - * you'd need 8kB of bitmaps/process, which is a bit excessive. - * - * Here we just change the eflags value on the stack: we allow - * only the super-user to do it. This depends on the stack-layout - * on system-call entry - see also fork() and the signal handling - * code. - */ -asmlinkage int sys_iopl(long ebx,long ecx,long edx, - long esi, long edi, long ebp, long eax, long ds, - long es, long fs, long gs, long orig_eax, - long eip,long cs,long eflags,long esp,long ss) -{ - unsigned int level = ebx; - - if (level > 3) - return -EINVAL; - if (!suser()) - return -EPERM; - *(&eflags) = (eflags & 0xffffcfff) | (level << 12); - return 0; -} - - -void snarf_region(unsigned int from, unsigned int num) -{ - if (from > IO_BITMAP_SIZE*32) - return; - if (from + num > IO_BITMAP_SIZE*32) - num = IO_BITMAP_SIZE*32 - from; - set_bitmap(ioport_registrar, from, num, 1); - return; -} - -void release_region(unsigned int from, unsigned int num) -{ - if (from > IO_BITMAP_SIZE*32) - return; - if (from + num > IO_BITMAP_SIZE*32) - num = IO_BITMAP_SIZE*32 - from; - set_bitmap(ioport_registrar, from, num, 0); - return; -} - -int check_region(unsigned int from, unsigned int num) -{ - if (from > IO_BITMAP_SIZE*32) - return 0; - if (from + num > IO_BITMAP_SIZE*32) - num = IO_BITMAP_SIZE*32 - from; - return check_bitmap(ioport_registrar, from, num); -} - -/* Called from init/main.c to reserve IO ports. */ -void reserve_setup(char *str, int *ints) -{ - int i; - - for (i = 1; i < ints[0]; i += 2) - snarf_region(ints[i], ints[i+1]); -} |