Add COP2 register state struct, and add functions to save and
restore COP2 at context switch.
Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx>
---
arch/mips/include/asm/cop2.h | 10 ++++
arch/mips/include/asm/processor.h | 12 ++++
arch/mips/netlogic/common/Makefile | 1 +
arch/mips/netlogic/common/cop2-ex.c | 113 +++++++++++++++++++++++++++++++++++
4 files changed, 136 insertions(+)
create mode 100644 arch/mips/netlogic/common/cop2-ex.c
diff --git a/arch/mips/include/asm/cop2.h b/arch/mips/include/asm/cop2.h
index b17f38e..39a752c 100644
--- a/arch/mips/include/asm/cop2.h
+++ b/arch/mips/include/asm/cop2.h
@@ -22,6 +22,16 @@ extern void octeon_cop2_restore(struct octeon_cop2_state *);
#define cop2_present 1
#define cop2_lazy_restore 1
+#elif defined(CONFIG_CPU_XLR) || defined(CONFIG_CPU_XLP)
+
+extern void nlm_cop2_save(struct nlm_cop2_state *);
+extern void nlm_cop2_restore(struct nlm_cop2_state *);
+#define cop2_save(r) nlm_cop2_save(r)
+#define cop2_restore(r) nlm_cop2_restore(r)
+
+#define cop2_present 1
+#define cop2_lazy_restore 0
+
#else
#define cop2_present 0
diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 131c78f..06e2f88 100644
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -186,6 +186,15 @@ struct octeon_cvmseg_state {
[cpu_dcache_line_size() / sizeof(unsigned long)];
};
+#elif defined(CONFIG_CPU_XLR) || defined(CONFIG_CPU_XLP)
+struct nlm_cop2_state {
+ u64 rx[4];
+ u64 tx[4];
+ u32 status0;
+};
+
+#define COP2_INIT \
+ .cp2 = {{0}, {0}, 0},
#else
#define COP2_INIT
#endif
@@ -233,6 +242,9 @@ struct thread_struct {
struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
#endif
+#if defined(CONFIG_CPU_XLR) || defined(CONFIG_CPU_XLP)
+ struct nlm_cop2_state cp2;
+#endif
struct mips_abi *abi;
};
diff --git a/arch/mips/netlogic/common/Makefile b/arch/mips/netlogic/common/Makefile
index 291372a..fbd34d3 100644
--- a/arch/mips/netlogic/common/Makefile
+++ b/arch/mips/netlogic/common/Makefile
@@ -1,3 +1,4 @@
obj-y += irq.o time.o
obj-$(CONFIG_SMP) += smp.o smpboot.o
obj-$(CONFIG_EARLY_PRINTK) += earlycons.o
+obj-y += cop2-ex.o
diff --git a/arch/mips/netlogic/common/cop2-ex.c b/arch/mips/netlogic/common/cop2-ex.c
new file mode 100644
index 0000000..73e77e5
--- /dev/null
+++ b/arch/mips/netlogic/common/cop2-ex.c
@@ -0,0 +1,113 @@
+/*
+ * 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@xxxxxxxxxxxxxx>
+ */
+#include <linux/init.h>
+#include <linux/irqflags.h>
+#include <linux/notifier.h>
+#include <linux/prefetch.h>
+#include <linux/sched.h>
+
+#include <asm/cop2.h>
+#include <asm/current.h>
+#include <asm/mipsregs.h>
+#include <asm/page.h>
+
+#include <asm/netlogic/xlr/fmn.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->rx), "r"(r->tx));
+
+ r->status0 = nlm_read_c2_status0() & 0x3f;
+}
+
+void nlm_cop2_restore(struct nlm_cop2_state *r)
+{
+ 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->rx), "r"(r->tx));
+
+ nlm_write_c2_status0(r->status0);
+}
+
+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);
--
1.7.9.5
