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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/frv/kernel/sysctl.c
1 /* sysctl.c: implementation of /proc/sys files relating to FRV specifically
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/config.h>
13 #include <linux/slab.h>
14 #include <linux/sysctl.h>
15 #include <linux/proc_fs.h>
16 #include <linux/init.h>
17 #include <asm/uaccess.h>
19 static const char frv_cache_wback
[] = "wback";
20 static const char frv_cache_wthru
[] = "wthru";
22 static void frv_change_dcache_mode(unsigned long newmode
)
24 unsigned long flags
, hsr0
;
26 local_irq_save(flags
);
32 asm volatile(" dcef @(gr0,gr0),#1 \n"
37 hsr0
= (hsr0
& ~HSR0_CBM
) | newmode
;
42 local_irq_restore(flags
);
44 //printk("HSR0 now %08lx\n", hsr0);
47 /*****************************************************************************/
49 * handle requests to dynamically switch the write caching mode delivered by /proc
51 static int procctl_frv_cachemode(ctl_table
*table
, int write
, struct file
*filp
,
52 void *buffer
, size_t *lenp
, loff_t
*ppos
)
61 /* potential state change */
62 if (len
<= 1 || len
> sizeof(buff
) - 1)
65 if (copy_from_user(buff
, buffer
, len
) != 0)
68 if (buff
[len
- 1] == '\n')
73 if (strcmp(buff
, frv_cache_wback
) == 0) {
74 /* switch dcache into write-back mode */
75 frv_change_dcache_mode(HSR0_CBM_COPY_BACK
);
79 if (strcmp(buff
, frv_cache_wthru
) == 0) {
80 /* switch dcache into write-through mode */
81 frv_change_dcache_mode(HSR0_CBM_WRITE_THRU
);
89 if (filp
->f_pos
> 0) {
95 switch (hsr0
& HSR0_CBM
) {
96 case HSR0_CBM_WRITE_THRU
:
97 memcpy(buff
, frv_cache_wthru
, sizeof(frv_cache_wthru
) - 1);
98 buff
[sizeof(frv_cache_wthru
) - 1] = '\n';
99 len
= sizeof(frv_cache_wthru
);
102 memcpy(buff
, frv_cache_wback
, sizeof(frv_cache_wback
) - 1);
103 buff
[sizeof(frv_cache_wback
) - 1] = '\n';
104 len
= sizeof(frv_cache_wback
);
111 if (copy_to_user(buffer
, buff
, len
) != 0)
118 } /* end procctl_frv_cachemode() */
120 /*****************************************************************************/
122 * permit the mm_struct the nominated process is using have its MMU context ID pinned
125 static int procctl_frv_pin_cxnr(ctl_table
*table
, int write
, struct file
*filp
,
126 void *buffer
, size_t *lenp
, loff_t
*ppos
)
135 /* potential state change */
136 if (len
<= 1 || len
> sizeof(buff
) - 1)
139 if (copy_from_user(buff
, buffer
, len
) != 0)
142 if (buff
[len
- 1] == '\n')
143 buff
[len
- 1] = '\0';
147 pid
= simple_strtoul(buff
, &p
, 10);
151 return cxn_pin_by_pid(pid
);
154 /* read the currently pinned CXN */
155 if (filp
->f_pos
> 0) {
160 len
= snprintf(buff
, sizeof(buff
), "%d\n", cxn_pinned
);
164 if (copy_to_user(buffer
, buff
, len
) != 0)
171 } /* end procctl_frv_pin_cxnr() */
175 * FR-V specific sysctls
177 static struct ctl_table frv_table
[] =
179 { 1, "cache-mode", NULL
, 0, 0644, NULL
, &procctl_frv_cachemode
},
181 { 2, "pin-cxnr", NULL
, 0, 0644, NULL
, &procctl_frv_pin_cxnr
},
187 * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
188 * when all the PM interfaces exist nicely.
191 static struct ctl_table frv_dir_table
[] =
193 {CTL_FRV
, "frv", NULL
, 0, 0555, frv_table
},
198 * Initialize power interface
200 static int __init
frv_sysctl_init(void)
202 register_sysctl_table(frv_dir_table
, 1);
206 __initcall(frv_sysctl_init
);