122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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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) 2013 Broadcom Corporation.
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*
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* based on arch/mips/cavium-octeon/cpu.c
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* Copyright (C) 2009 Wind River Systems,
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* written by Ralf Baechle <ralf@linux-mips.org>
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*/
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#include <linux/capability.h>
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#include <linux/init.h>
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#include <linux/irqflags.h>
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#include <linux/notifier.h>
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#include <linux/prefetch.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <asm/cop2.h>
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#include <asm/current.h>
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#include <asm/mipsregs.h>
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#include <asm/page.h>
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#include <asm/netlogic/mips-extns.h>
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/*
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* 64 bit ops are done in inline assembly to support 32 bit
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* compilation
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*/
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void nlm_cop2_save(struct nlm_cop2_state *r)
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{
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asm volatile(
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".set push\n"
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".set noat\n"
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"dmfc2 $1, $0, 0\n"
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"sd $1, 0(%1)\n"
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"dmfc2 $1, $0, 1\n"
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"sd $1, 8(%1)\n"
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"dmfc2 $1, $0, 2\n"
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"sd $1, 16(%1)\n"
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"dmfc2 $1, $0, 3\n"
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"sd $1, 24(%1)\n"
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"dmfc2 $1, $1, 0\n"
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"sd $1, 0(%2)\n"
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"dmfc2 $1, $1, 1\n"
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"sd $1, 8(%2)\n"
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"dmfc2 $1, $1, 2\n"
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"sd $1, 16(%2)\n"
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"dmfc2 $1, $1, 3\n"
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"sd $1, 24(%2)\n"
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".set pop\n"
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: "=m"(*r)
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: "r"(r->tx), "r"(r->rx));
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r->tx_msg_status = __read_32bit_c2_register($2, 0);
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r->rx_msg_status = __read_32bit_c2_register($3, 0) & 0x0fffffff;
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}
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void nlm_cop2_restore(struct nlm_cop2_state *r)
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{
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u32 rstat;
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asm volatile(
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".set push\n"
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".set noat\n"
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"ld $1, 0(%1)\n"
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"dmtc2 $1, $0, 0\n"
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"ld $1, 8(%1)\n"
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"dmtc2 $1, $0, 1\n"
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"ld $1, 16(%1)\n"
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"dmtc2 $1, $0, 2\n"
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"ld $1, 24(%1)\n"
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"dmtc2 $1, $0, 3\n"
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"ld $1, 0(%2)\n"
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"dmtc2 $1, $1, 0\n"
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"ld $1, 8(%2)\n"
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"dmtc2 $1, $1, 1\n"
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"ld $1, 16(%2)\n"
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"dmtc2 $1, $1, 2\n"
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"ld $1, 24(%2)\n"
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"dmtc2 $1, $1, 3\n"
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".set pop\n"
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: : "m"(*r), "r"(r->tx), "r"(r->rx));
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__write_32bit_c2_register($2, 0, r->tx_msg_status);
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rstat = __read_32bit_c2_register($3, 0) & 0xf0000000u;
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__write_32bit_c2_register($3, 0, r->rx_msg_status | rstat);
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}
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static int nlm_cu2_call(struct notifier_block *nfb, unsigned long action,
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void *data)
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{
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unsigned long flags;
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unsigned int status;
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switch (action) {
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case CU2_EXCEPTION:
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if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
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break;
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local_irq_save(flags);
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KSTK_STATUS(current) |= ST0_CU2;
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status = read_c0_status();
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write_c0_status(status | ST0_CU2);
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nlm_cop2_restore(&(current->thread.cp2));
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write_c0_status(status & ~ST0_CU2);
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local_irq_restore(flags);
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pr_info("COP2 access enabled for pid %d (%s)\n",
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current->pid, current->comm);
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return NOTIFY_BAD; /* Don't call default notifier */
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}
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return NOTIFY_OK; /* Let default notifier send signals */
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}
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static int __init nlm_cu2_setup(void)
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{
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return cu2_notifier(nlm_cu2_call, 0);
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}
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early_initcall(nlm_cu2_setup);
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