[PATCH V3 17/22] LoongArch: Add some library functions

[Huacai Chen <chenhuacai@loongson.cn>]

This patch adds some library functions for LoongArch, including: delay,
memset, memcpy, memmove, copy_user, strncpy_user, strnlen_user and tlb
dump functions.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
 arch/loongarch/include/asm/delay.h  |  26 +++++++
 arch/loongarch/include/asm/string.h |  17 +++++
 arch/loongarch/lib/clear_user.S     |  43 +++++++++++
 arch/loongarch/lib/copy_user.S      |  47 ++++++++++++
 arch/loongarch/lib/delay.c          |  43 +++++++++++
 arch/loongarch/lib/dump_tlb.c       | 111 ++++++++++++++++++++++++++++
 arch/loongarch/lib/memcpy.S         |  32 ++++++++
 arch/loongarch/lib/memmove.S        |  45 +++++++++++
 arch/loongarch/lib/memset.S         |  30 ++++++++
 arch/loongarch/lib/strncpy_user.S   |  51 +++++++++++++
 arch/loongarch/lib/strnlen_user.S   |  47 ++++++++++++
 11 files changed, 492 insertions(+)
 create mode 100644 arch/loongarch/include/asm/delay.h
 create mode 100644 arch/loongarch/include/asm/string.h
 create mode 100644 arch/loongarch/lib/clear_user.S
 create mode 100644 arch/loongarch/lib/copy_user.S
 create mode 100644 arch/loongarch/lib/delay.c
 create mode 100644 arch/loongarch/lib/dump_tlb.c
 create mode 100644 arch/loongarch/lib/memcpy.S
 create mode 100644 arch/loongarch/lib/memmove.S
 create mode 100644 arch/loongarch/lib/memset.S
 create mode 100644 arch/loongarch/lib/strncpy_user.S
 create mode 100644 arch/loongarch/lib/strnlen_user.S

diff --git a/arch/loongarch/include/asm/delay.h b/arch/loongarch/include/asm/delay.h
new file mode 100644
index 000000000000..717227c1c79d
--- /dev/null
+++ b/arch/loongarch/include/asm/delay.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_DELAY_H
+#define _ASM_DELAY_H
+
+#include <linux/param.h>
+
+extern void __delay(unsigned long loops);
+extern void __ndelay(unsigned long ns);
+extern void __udelay(unsigned long us);
+
+#define ndelay(ns) __ndelay(ns)
+#define udelay(us) __udelay(us)
+
+/* make sure "usecs *= ..." in udelay do not overflow. */
+#if HZ >= 1000
+#define MAX_UDELAY_MS	1
+#elif HZ <= 200
+#define MAX_UDELAY_MS	5
+#else
+#define MAX_UDELAY_MS	(1000 / HZ)
+#endif
+
+#endif /* _ASM_DELAY_H */
diff --git a/arch/loongarch/include/asm/string.h b/arch/loongarch/include/asm/string.h
new file mode 100644
index 000000000000..21e9e0a58194
--- /dev/null
+++ b/arch/loongarch/include/asm/string.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_STRING_H
+#define _ASM_STRING_H
+
+#define __HAVE_ARCH_MEMSET
+extern void *memset(void *__s, int __c, size_t __count);
+
+#define __HAVE_ARCH_MEMCPY
+extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
+
+#define __HAVE_ARCH_MEMMOVE
+extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
+
+#endif /* _ASM_STRING_H */
diff --git a/arch/loongarch/lib/clear_user.S b/arch/loongarch/lib/clear_user.S
new file mode 100644
index 000000000000..97b9998360cc
--- /dev/null
+++ b/arch/loongarch/lib/clear_user.S
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+.macro fixup_ex from, to, offset, fix
+.if \fix
+	.section .fixup, "ax"
+\to:	addi.d	v0, a1, \offset
+	jr	ra
+	.previous
+.endif
+	.section __ex_table, "a"
+	PTR	\from\()b, \to\()b
+	.previous
+.endm
+
+/*
+ * unsigned long __clear_user(void *addr, size_t size)
+ *
+ * a0: addr
+ * a1: size
+ */
+SYM_FUNC_START(__clear_user)
+	beqz	a1, 2f
+
+1:	st.b	zero, a0, 0
+	addi.d	a0, a0, 1
+	addi.d	a1, a1, -1
+	bgt	a1, zero, 1b
+
+2:	move	v0, a1
+	jr	ra
+
+	fixup_ex 1, 3, 0, 1
+SYM_FUNC_END(__clear_user)
+
+EXPORT_SYMBOL(__clear_user)
diff --git a/arch/loongarch/lib/copy_user.S b/arch/loongarch/lib/copy_user.S
new file mode 100644
index 000000000000..b814efd9cbd2
--- /dev/null
+++ b/arch/loongarch/lib/copy_user.S
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+.macro fixup_ex from, to, offset, fix
+.if \fix
+	.section .fixup, "ax"
+\to:	addi.d	v0, a2, \offset
+	jr	ra
+	.previous
+.endif
+	.section __ex_table, "a"
+	PTR	\from\()b, \to\()b
+	.previous
+.endm
+
+/*
+ * unsigned long __copy_user(void *to, const void *from, size_t n)
+ *
+ * a0: to
+ * a1: from
+ * a2: n
+ */
+SYM_FUNC_START(__copy_user)
+	beqz	a2, 3f
+
+1:	ld.b	t0, a1, 0
+2:	st.b	t0, a0, 0
+	addi.d	a0, a0, 1
+	addi.d	a1, a1, 1
+	addi.d	a2, a2, -1
+	bgt	a2, zero, 1b
+
+3:	move	v0, a2
+	jr	ra
+
+	fixup_ex 1, 4, 0, 1
+	fixup_ex 2, 4, 0, 0
+SYM_FUNC_END(__copy_user)
+
+EXPORT_SYMBOL(__copy_user)
diff --git a/arch/loongarch/lib/delay.c b/arch/loongarch/lib/delay.c
new file mode 100644
index 000000000000..cf22f0899a9a
--- /dev/null
+++ b/arch/loongarch/lib/delay.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/smp.h>
+#include <linux/timex.h>
+
+#include <asm/compiler.h>
+#include <asm/processor.h>
+
+void __delay(unsigned long cycles)
+{
+	u64 t0 = get_cycles();
+
+	while ((unsigned long)(get_cycles() - t0) < cycles)
+		cpu_relax();
+}
+EXPORT_SYMBOL(__delay);
+
+/*
+ * Division by multiplication: you don't have to worry about
+ * loss of precision.
+ *
+ * Use only for very small delays ( < 1 msec).	Should probably use a
+ * lookup table, really, as the multiplications take much too long with
+ * short delays.  This is a "reasonable" implementation, though (and the
+ * first constant multiplications gets optimized away if the delay is
+ * a constant)
+ */
+
+void __udelay(unsigned long us)
+{
+	__delay((us * 0x000010c7ull * HZ * lpj_fine) >> 32);
+}
+EXPORT_SYMBOL(__udelay);
+
+void __ndelay(unsigned long ns)
+{
+	__delay((ns * 0x00000005ull * HZ * lpj_fine) >> 32);
+}
+EXPORT_SYMBOL(__ndelay);
diff --git a/arch/loongarch/lib/dump_tlb.c b/arch/loongarch/lib/dump_tlb.c
new file mode 100644
index 000000000000..21b55681a726
--- /dev/null
+++ b/arch/loongarch/lib/dump_tlb.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ *
+ * Derived from MIPS:
+ * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
+ * Copyright (C) 1999 by Silicon Graphics, Inc.
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+
+#include <asm/loongarch.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/tlb.h>
+
+void dump_tlb_regs(void)
+{
+	const int field = 2 * sizeof(unsigned long);
+
+	pr_info("Index    : %0x\n", read_csr_tlbidx());
+	pr_info("PageSize : %0x\n", read_csr_pagesize());
+	pr_info("EntryHi  : %0*lx\n", field, read_csr_entryhi());
+	pr_info("EntryLo0 : %0*lx\n", field, read_csr_entrylo0());
+	pr_info("EntryLo1 : %0*lx\n", field, read_csr_entrylo1());
+}
+
+static void dump_tlb(int first, int last)
+{
+	unsigned long s_entryhi, entryhi, asid;
+	unsigned long long entrylo0, entrylo1, pa;
+	unsigned int index;
+	unsigned int s_index, s_asid;
+	unsigned int pagesize, c0, c1, i;
+	unsigned long asidmask = cpu_asid_mask(&current_cpu_data);
+	int pwidth = 11;
+	int vwidth = 11;
+	int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1, 4);
+
+	s_entryhi = read_csr_entryhi();
+	s_index = read_csr_tlbidx();
+	s_asid = read_csr_asid();
+
+	for (i = first; i <= last; i++) {
+		write_csr_index(i);
+		tlb_read();
+		pagesize = read_csr_pagesize();
+		entryhi	 = read_csr_entryhi();
+		entrylo0 = read_csr_entrylo0();
+		entrylo1 = read_csr_entrylo1();
+		index = read_csr_tlbidx();
+		asid = read_csr_asid();
+
+		/* EHINV bit marks entire entry as invalid */
+		if (index & CSR_TLBIDX_EHINV)
+			continue;
+		/*
+		 * ASID takes effect in absence of G (global) bit.
+		 */
+		if (!((entrylo0 | entrylo1) & ENTRYLO_G) &&
+		    asid != s_asid)
+			continue;
+
+		/*
+		 * Only print entries in use
+		 */
+		pr_info("Index: %2d pgsize=%x ", i, (1 << pagesize));
+
+		c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
+		c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
+
+		pr_cont("va=%0*lx asid=%0*lx",
+			vwidth, (entryhi & ~0x1fffUL), asidwidth, asid & asidmask);
+
+		/* RI/XI are in awkward places, so mask them off separately */
+		pa = entrylo0 & ~(ENTRYLO_RI | ENTRYLO_XI);
+		pa = pa & PAGE_MASK;
+		pr_cont("\n\t[");
+		pr_cont("ri=%d xi=%d ",
+			(entrylo0 & ENTRYLO_RI) ? 1 : 0,
+			(entrylo0 & ENTRYLO_XI) ? 1 : 0);
+		pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d plv=%lld] [",
+			pwidth, pa, c0,
+			(entrylo0 & ENTRYLO_D) ? 1 : 0,
+			(entrylo0 & ENTRYLO_V) ? 1 : 0,
+			(entrylo0 & ENTRYLO_G) ? 1 : 0,
+			(entrylo0 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT);
+		/* RI/XI are in awkward places, so mask them off separately */
+		pa = entrylo1 & ~(ENTRYLO_RI | ENTRYLO_XI);
+		pa = pa & PAGE_MASK;
+		pr_cont("ri=%d xi=%d ",
+			(entrylo1 & ENTRYLO_RI) ? 1 : 0,
+			(entrylo1 & ENTRYLO_XI) ? 1 : 0);
+		pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d plv=%lld]\n",
+			pwidth, pa, c1,
+			(entrylo1 & ENTRYLO_D) ? 1 : 0,
+			(entrylo1 & ENTRYLO_V) ? 1 : 0,
+			(entrylo1 & ENTRYLO_G) ? 1 : 0,
+			(entrylo1 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT);
+	}
+	pr_info("\n");
+
+	write_csr_entryhi(s_entryhi);
+	write_csr_tlbidx(s_index);
+	write_csr_asid(s_asid);
+}
+
+void dump_tlb_all(void)
+{
+	dump_tlb(0, current_cpu_data.tlbsize - 1);
+}
diff --git a/arch/loongarch/lib/memcpy.S b/arch/loongarch/lib/memcpy.S
new file mode 100644
index 000000000000..e94899d99624
--- /dev/null
+++ b/arch/loongarch/lib/memcpy.S
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+/*
+ * void *memcpy(void *dst, const void *src, size_t n)
+ *
+ * a0: dst
+ * a1: src
+ * a2: n
+ */
+SYM_FUNC_START(memcpy)
+	move	a3, a0
+	beqz	a2, 2f
+
+1:	ld.b	t0, a1, 0
+	st.b	t0, a0, 0
+	addi.d	a0, a0, 1
+	addi.d	a1, a1, 1
+	addi.d	a2, a2, -1
+	bgt	a2, zero, 1b
+
+2:	move	v0, a3
+	jr	ra
+SYM_FUNC_END(memcpy)
+
+EXPORT_SYMBOL(memcpy)
diff --git a/arch/loongarch/lib/memmove.S b/arch/loongarch/lib/memmove.S
new file mode 100644
index 000000000000..f55d8dcd09dd
--- /dev/null
+++ b/arch/loongarch/lib/memmove.S
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+/*
+ * void *rmemcpy(void *dst, const void *src, size_t n)
+ *
+ * a0: dst
+ * a1: src
+ * a2: n
+ */
+SYM_FUNC_START(rmemcpy)
+	move	a3, a0
+	beqz	a2, 2f
+
+	add.d	a0, a0, a2
+	add.d	a1, a1, a2
+
+1:	ld.b	t0, a1, -1
+	st.b	t0, a0, -1
+	addi.d	a0, a0, -1
+	addi.d	a1, a1, -1
+	addi.d	a2, a2, -1
+	bgt	a2, zero, 1b
+
+2:	move	v0, a3
+	jr	ra
+SYM_FUNC_END(rmemcpy)
+
+SYM_FUNC_START(memmove)
+	blt	a0, a1, 1f	/* dst < src, memcpy */
+	blt	a1, a0, 2f	/* src < dst, rmemcpy */
+	jr	ra		/* dst == src, return */
+
+1:	b	memcpy
+
+2:	b	rmemcpy
+SYM_FUNC_END(memmove)
+
+EXPORT_SYMBOL(memmove)
diff --git a/arch/loongarch/lib/memset.S b/arch/loongarch/lib/memset.S
new file mode 100644
index 000000000000..f599017e68fd
--- /dev/null
+++ b/arch/loongarch/lib/memset.S
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+/*
+ * void *memset(void *s, int c, size_t n)
+ *
+ * a0: s
+ * a1: c
+ * a2: n
+ */
+SYM_FUNC_START(memset)
+	move	a3, a0
+	beqz	a2, 2f
+
+1:	st.b	a1, a0, 0
+	addi.d	a0, a0, 1
+	addi.d	a2, a2, -1
+	bgt	a2, zero, 1b
+
+2:	move	v0, a3
+	jr	ra
+SYM_FUNC_END(memset)
+
+EXPORT_SYMBOL(memset)
diff --git a/arch/loongarch/lib/strncpy_user.S b/arch/loongarch/lib/strncpy_user.S
new file mode 100644
index 000000000000..b42d81045929
--- /dev/null
+++ b/arch/loongarch/lib/strncpy_user.S
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+#include <linux/errno.h>
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+#define _ASM_EXTABLE(from, to)			\
+	.section __ex_table, "a";		\
+	PTR	from, to;			\
+	.previous
+
+/*
+ * long __strncpy_from_user(char *to, const char *from, long len)
+ *
+ * a0: to
+ * a1: from
+ * a2: len
+ */
+SYM_FUNC_START(__strncpy_from_user)
+	move	a3, zero
+
+1:	ld.b	t0, a1, 0
+	st.b	t0, a0, 0
+	addi.d	a0, a0, 1
+	addi.d	a1, a1, 1
+	beqz	t0, 2f
+
+	addi.d	a3, a3, 1
+	blt	a3, a2, 1b
+
+	/*
+	 * return len if the entire buffer filled,
+	 * return strlen else
+	 */
+2:	move	v0, a3
+	jr	ra
+
+	.section .fixup, "ax"
+	/* return -EFAULT if exception before terminator */
+3:	li.w	a0, -EFAULT
+	jr	ra
+	.previous
+
+	_ASM_EXTABLE(1b, 3b)
+SYM_FUNC_END(__strncpy_from_user)
+
+EXPORT_SYMBOL(__strncpy_from_user)
diff --git a/arch/loongarch/lib/strnlen_user.S b/arch/loongarch/lib/strnlen_user.S
new file mode 100644
index 000000000000..9288a5ad294e
--- /dev/null
+++ b/arch/loongarch/lib/strnlen_user.S
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ */
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+#define _ASM_EXTABLE(from, to)			\
+	.section __ex_table, "a";		\
+	PTR	from, to;			\
+	.previous
+
+/*
+ * long __strnlen_user(const char *s, long n)
+ *
+ * a0: s
+ * a1: n
+ */
+SYM_FUNC_START(__strnlen_user)
+	move	a2, zero
+
+1:	ld.b	t0, a0, 0
+	addi.d	a0, a0, 1
+	addi.d	a2, a2, 1
+	beqz	t0, 2f
+
+	bge	a1, a2, 1b
+
+	/*
+	 * return the size of a string including the ending NUL character
+	 * up to a maximum of n
+	 */
+2:	move	v0, a2
+	jr	ra
+
+	.section .fixup, "ax"
+	/* return 0 in case of error */
+3:	move	v0, zero
+	jr	ra
+	.previous
+
+	_ASM_EXTABLE(1b, 3b)
+SYM_FUNC_END(__strnlen_user)
+
+EXPORT_SYMBOL(__strnlen_user)
-- 
2.27.0