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/*
* 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;
}
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