Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/vdso/datapage.S b/arch/powerpc/kernel/vdso/datapage.S
new file mode 100644
index 000000000..db8e167f0
--- /dev/null
+++ b/arch/powerpc/kernel/vdso/datapage.S
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Access to the shared data page by the vDSO & syscall map
+ *
+ * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp.
+ */
+
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+#include <asm/vdso.h>
+#include <asm/vdso_datapage.h>
+
+	.text
+
+/*
+ * void *__kernel_get_syscall_map(unsigned int *syscall_count) ;
+ *
+ * returns a pointer to the syscall map. the map is agnostic to the
+ * size of "long", unlike kernel bitops, it stores bits from top to
+ * bottom so that memory actually contains a linear bitmap
+ * check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of
+ * 32 bits int at N >> 5.
+ */
+V_FUNCTION_BEGIN(__kernel_get_syscall_map)
+  .cfi_startproc
+	mflr	r12
+  .cfi_register lr,r12
+	mr.	r4,r3
+	get_datapage	r3
+	mtlr	r12
+#ifdef __powerpc64__
+	addi	r3,r3,CFG_SYSCALL_MAP64
+#else
+	addi	r3,r3,CFG_SYSCALL_MAP32
+#endif
+	crclr	cr0*4+so
+	beqlr
+	li	r0,NR_syscalls
+	stw	r0,0(r4)
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_get_syscall_map)
+
+/*
+ * void unsigned long long  __kernel_get_tbfreq(void);
+ *
+ * returns the timebase frequency in HZ
+ */
+V_FUNCTION_BEGIN(__kernel_get_tbfreq)
+  .cfi_startproc
+	mflr	r12
+  .cfi_register lr,r12
+	get_datapage	r3
+#ifndef __powerpc64__
+	lwz	r4,(CFG_TB_TICKS_PER_SEC + 4)(r3)
+#endif
+	PPC_LL	r3,CFG_TB_TICKS_PER_SEC(r3)
+	mtlr	r12
+	crclr	cr0*4+so
+	blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_get_tbfreq)