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