55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/*
|
|
* promdevmap.c: Map device/IO areas to virtual addresses.
|
|
*
|
|
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include <asm/openprom.h>
|
|
#include <asm/oplib.h>
|
|
|
|
extern void restore_current(void);
|
|
|
|
/* Just like the routines in palloc.c, these should not be used
|
|
* by the kernel at all. Bootloader facility mainly. And again,
|
|
* this is only available on V2 proms and above.
|
|
*/
|
|
|
|
/* Map physical device address 'paddr' in IO space 'ios' of size
|
|
* 'num_bytes' to a virtual address, with 'vhint' being a hint to
|
|
* the prom as to where you would prefer the mapping. We return
|
|
* where the prom actually mapped it.
|
|
*/
|
|
char *
|
|
prom_mapio(char *vhint, int ios, unsigned int paddr, unsigned int num_bytes)
|
|
{
|
|
unsigned long flags;
|
|
char *ret;
|
|
|
|
spin_lock_irqsave(&prom_lock, flags);
|
|
if((num_bytes == 0) || (paddr == 0)) ret = (char *) 0x0;
|
|
else
|
|
ret = (*(romvec->pv_v2devops.v2_dumb_mmap))(vhint, ios, paddr,
|
|
num_bytes);
|
|
restore_current();
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
/* Unmap an IO/device area that was mapped using the above routine. */
|
|
void
|
|
prom_unmapio(char *vaddr, unsigned int num_bytes)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if(num_bytes == 0x0) return;
|
|
spin_lock_irqsave(&prom_lock, flags);
|
|
(*(romvec->pv_v2devops.v2_dumb_munmap))(vaddr, num_bytes);
|
|
restore_current();
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
|
return;
|
|
}
|