Commit | Line | Data |
---|---|---|
88278ca2 | 1 | /* |
1da177e4 LT |
2 | * promdevmap.c: Map device/IO areas to virtual addresses. |
3 | * | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | */ | |
6 | ||
7 | #include <linux/types.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/sched.h> | |
10 | ||
11 | #include <asm/openprom.h> | |
12 | #include <asm/oplib.h> | |
13 | ||
14 | extern void restore_current(void); | |
15 | ||
16 | /* Just like the routines in palloc.c, these should not be used | |
17 | * by the kernel at all. Bootloader facility mainly. And again, | |
18 | * this is only available on V2 proms and above. | |
19 | */ | |
20 | ||
21 | /* Map physical device address 'paddr' in IO space 'ios' of size | |
22 | * 'num_bytes' to a virtual address, with 'vhint' being a hint to | |
23 | * the prom as to where you would prefer the mapping. We return | |
24 | * where the prom actually mapped it. | |
25 | */ | |
26 | char * | |
27 | prom_mapio(char *vhint, int ios, unsigned int paddr, unsigned int num_bytes) | |
28 | { | |
29 | unsigned long flags; | |
30 | char *ret; | |
31 | ||
32 | spin_lock_irqsave(&prom_lock, flags); | |
33 | if((num_bytes == 0) || (paddr == 0)) ret = (char *) 0x0; | |
34 | else | |
35 | ret = (*(romvec->pv_v2devops.v2_dumb_mmap))(vhint, ios, paddr, | |
36 | num_bytes); | |
37 | restore_current(); | |
38 | spin_unlock_irqrestore(&prom_lock, flags); | |
39 | return ret; | |
40 | } | |
41 | ||
42 | /* Unmap an IO/device area that was mapped using the above routine. */ | |
43 | void | |
44 | prom_unmapio(char *vaddr, unsigned int num_bytes) | |
45 | { | |
46 | unsigned long flags; | |
47 | ||
48 | if(num_bytes == 0x0) return; | |
49 | spin_lock_irqsave(&prom_lock, flags); | |
50 | (*(romvec->pv_v2devops.v2_dumb_munmap))(vaddr, num_bytes); | |
51 | restore_current(); | |
52 | spin_unlock_irqrestore(&prom_lock, flags); | |
53 | return; | |
54 | } |