Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 99 insertions, 0 deletions

diff --git a/arch/alpha/kernel/head.S b/arch/alpha/kernel/head.S
new file mode 100644
index 000000000..bb48a8ae4
--- /dev/null
+++ b/arch/alpha/kernel/head.S
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arch/alpha/kernel/head.S
+ *
+ * initial boot stuff.. At this point, the bootloader has already
+ * switched into OSF/1 PAL-code, and loaded us at the correct address
+ * (START_ADDR).  So there isn't much left for us to do: just set up
+ * the kernel global pointer and jump to the kernel entry-point.
+ */
+
+#include <linux/init.h>
+#include <asm/asm-offsets.h>
+#include <asm/pal.h>
+#include <asm/setup.h>
+
+__HEAD
+.globl _stext
+	.set noreorder
+	.globl	__start
+	.ent	__start
+_stext:
+__start:
+	.prologue 0
+	br	$27,1f
+1:	ldgp	$29,0($27)
+	/* We need to get current_task_info loaded up...  */
+	lda	$8,init_thread_union
+	/* ... and find our stack ... */
+	lda	$30,0x4000 - SIZEOF_PT_REGS($8)
+	/* ... and then we can start the kernel.  */
+	jsr	$26,start_kernel
+	call_pal PAL_halt
+	.end __start
+
+#ifdef CONFIG_SMP
+	.align 3
+	.globl	__smp_callin
+	.ent	__smp_callin
+	/* On entry here from SRM console, the HWPCB of the per-cpu
+	   slot for this processor has been loaded.  We've arranged
+	   for the UNIQUE value for this process to contain the PCBB
+	   of the target idle task.  */
+__smp_callin:
+	.prologue 1
+	ldgp	$29,0($27)	# First order of business, load the GP.
+
+	call_pal PAL_rduniq	# Grab the target PCBB.
+	mov	$0,$16		# Install it.
+	call_pal PAL_swpctx
+
+	lda	$8,0x3fff	# Find "current".
+	bic	$30,$8,$8
+	
+	jsr	$26,smp_callin
+	call_pal PAL_halt
+	.end __smp_callin
+#endif /* CONFIG_SMP */
+
+	#
+	# The following two functions are needed for supporting SRM PALcode
+	# on the PC164 (at least), since that PALcode manages the interrupt
+	# masking, and we cannot duplicate the effort without causing problems
+	#
+
+	.align 3
+	.globl	cserve_ena
+	.ent	cserve_ena
+cserve_ena:
+	.prologue 0
+	bis	$16,$16,$17
+	lda	$16,52($31)
+	call_pal PAL_cserve
+	ret	($26)
+	.end	cserve_ena
+
+	.align 3
+	.globl	cserve_dis
+	.ent	cserve_dis
+cserve_dis:
+	.prologue 0
+	bis	$16,$16,$17
+	lda	$16,53($31)
+	call_pal PAL_cserve
+	ret	($26)
+	.end	cserve_dis
+
+	#
+	# It is handy, on occasion, to make halt actually just loop. 
+	# Putting it here means we dont have to recompile the whole
+	# kernel.
+	#
+
+	.align 3
+	.globl	halt
+	.ent	halt
+halt:
+	.prologue 0
+	call_pal PAL_halt
+	.end	halt