mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
2.8 KiB
121 lines
2.8 KiB
/* |
|
* 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 <[email protected]> |
|
*/ |
|
#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);
|
|
|