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