/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004-2012 Cavium Networks
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*/
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#include <asm/cop2.h>
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#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <linux/sched/task_stack.h>
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#include "octeon-crypto.h"
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/**
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* Enable access to Octeon's COP2 crypto hardware for kernel use. Wrap any
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* crypto operations in calls to octeon_crypto_enable/disable in order to make
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* sure the state of COP2 isn't corrupted if userspace is also performing
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* hardware crypto operations. Allocate the state parameter on the stack.
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* Returns with preemption disabled.
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*
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* @state: Pointer to state structure to store current COP2 state in.
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*
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* Returns: Flags to be passed to octeon_crypto_disable()
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*/
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unsigned long octeon_crypto_enable(struct octeon_cop2_state *state)
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{
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int status;
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unsigned long flags;
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preempt_disable();
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local_irq_save(flags);
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status = read_c0_status();
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write_c0_status(status | ST0_CU2);
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if (KSTK_STATUS(current) & ST0_CU2) {
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octeon_cop2_save(&(current->thread.cp2));
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KSTK_STATUS(current) &= ~ST0_CU2;
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status &= ~ST0_CU2;
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} else if (status & ST0_CU2) {
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octeon_cop2_save(state);
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}
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local_irq_restore(flags);
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return status & ST0_CU2;
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}
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EXPORT_SYMBOL_GPL(octeon_crypto_enable);
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/**
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* Disable access to Octeon's COP2 crypto hardware in the kernel. This must be
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* called after an octeon_crypto_enable() before any context switch or return to
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* userspace.
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*
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* @state: Pointer to COP2 state to restore
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* @flags: Return value from octeon_crypto_enable()
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*/
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void octeon_crypto_disable(struct octeon_cop2_state *state,
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unsigned long crypto_flags)
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{
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unsigned long flags;
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local_irq_save(flags);
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if (crypto_flags & ST0_CU2)
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octeon_cop2_restore(state);
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else
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write_c0_status(read_c0_status() & ~ST0_CU2);
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local_irq_restore(flags);
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preempt_enable();
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}
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EXPORT_SYMBOL_GPL(octeon_crypto_disable);
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