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f421258d AK |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2004-2012 Cavium Networks | |
7 | */ | |
8 | ||
9 | #include <asm/cop2.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/interrupt.h> | |
12 | ||
13 | #include "octeon-crypto.h" | |
14 | ||
15 | /** | |
16 | * Enable access to Octeon's COP2 crypto hardware for kernel use. Wrap any | |
17 | * crypto operations in calls to octeon_crypto_enable/disable in order to make | |
18 | * sure the state of COP2 isn't corrupted if userspace is also performing | |
19 | * hardware crypto operations. Allocate the state parameter on the stack. | |
c3bc38d9 | 20 | * Returns with preemption disabled. |
f421258d AK |
21 | * |
22 | * @state: Pointer to state structure to store current COP2 state in. | |
23 | * | |
24 | * Returns: Flags to be passed to octeon_crypto_disable() | |
25 | */ | |
26 | unsigned long octeon_crypto_enable(struct octeon_cop2_state *state) | |
27 | { | |
28 | int status; | |
29 | unsigned long flags; | |
30 | ||
c3bc38d9 | 31 | preempt_disable(); |
f421258d AK |
32 | local_irq_save(flags); |
33 | status = read_c0_status(); | |
34 | write_c0_status(status | ST0_CU2); | |
35 | if (KSTK_STATUS(current) & ST0_CU2) { | |
36 | octeon_cop2_save(&(current->thread.cp2)); | |
37 | KSTK_STATUS(current) &= ~ST0_CU2; | |
38 | status &= ~ST0_CU2; | |
39 | } else if (status & ST0_CU2) { | |
40 | octeon_cop2_save(state); | |
41 | } | |
42 | local_irq_restore(flags); | |
43 | return status & ST0_CU2; | |
44 | } | |
45 | EXPORT_SYMBOL_GPL(octeon_crypto_enable); | |
46 | ||
47 | /** | |
48 | * Disable access to Octeon's COP2 crypto hardware in the kernel. This must be | |
49 | * called after an octeon_crypto_enable() before any context switch or return to | |
50 | * userspace. | |
51 | * | |
52 | * @state: Pointer to COP2 state to restore | |
53 | * @flags: Return value from octeon_crypto_enable() | |
54 | */ | |
55 | void octeon_crypto_disable(struct octeon_cop2_state *state, | |
56 | unsigned long crypto_flags) | |
57 | { | |
58 | unsigned long flags; | |
59 | ||
60 | local_irq_save(flags); | |
61 | if (crypto_flags & ST0_CU2) | |
62 | octeon_cop2_restore(state); | |
63 | else | |
64 | write_c0_status(read_c0_status() & ~ST0_CU2); | |
65 | local_irq_restore(flags); | |
c3bc38d9 | 66 | preempt_enable(); |
f421258d AK |
67 | } |
68 | EXPORT_SYMBOL_GPL(octeon_crypto_disable); |