Import of Linus's Linux 1.1.68

1 files changed, 111 insertions, 0 deletions

diff --git a/arch/alpha/boot/head.S b/arch/alpha/boot/head.S
new file mode 100644
index 000000000..03a2a9010
--- /dev/null
+++ b/arch/alpha/boot/head.S
@@ -0,0 +1,111 @@
+/*
+ * alpha/head.S
+ *
+ * initial boot stuff..
+ */
+
+#include <asm/system.h>
+
+#define halt .long PAL_halt
+
+/*
+ * NOTE! The console bootstrap will load us at 0x20000000, but this image
+ * is linked to run at START_ADDR, so the first thing we do is to move
+ * ourself up to the right address.. We'd better be position-independent
+ * at that stage :-)
+ */
+	.set noreorder
+	.globl	__start
+	.ent	__start
+__start:
+	bis	$31,$31,$31
+	br	$1,$200
+	.long START_ADDR, START_ADDR >> 32	/* strange bug in the assembler.. duh */
+	.long START_SIZE, START_SIZE >> 32
+$200:	ldq	$30,0($1)		/* new stack - below this */
+	lda	$2,-8($1)		/* __start */
+	bis	$30,$30,$3		/* new address */
+	subq	$3,$2,$6		/* difference */
+	ldq	$4,8($1)		/* size */
+$201:	subq	$4,8,$4
+	ldq	$5,0($2)
+	addq	$2,8,$2
+	stq	$5,0($3)
+	addq	$3,8,$3
+	bne	$4,$201
+	br	$1,$202
+$202:	addq	$1,$6,$1
+	addq	$1,12,$1		/* $203 in the new address space */
+	jmp	$31,($1),$203
+$203:	br	$27,$100
+$100:	ldgp	$29,0($27)
+	lda	$27,start_kernel
+	jsr	$26,($27),start_kernel
+	halt
+	.end __start
+
+	.align 5
+	.globl	wrent
+	.ent	wrent
+wrent:
+	.long PAL_wrent
+	ret ($26)
+	.end wrent
+
+	.align 5
+	.globl	wrkgp
+	.ent	wrkgp
+wrkgp:
+	.long PAL_wrkgp
+	ret ($26)
+	.end wrkgp
+
+	.align 5
+	.globl	switch_to_osf_pal
+	.ent	switch_to_osf_pal
+switch_to_osf_pal:
+	subq	$30,128,$30
+	stq	$26,0($30)
+	stq	$1,8($30)
+	stq	$2,16($30)
+	stq	$3,24($30)
+	stq	$4,32($30)
+	stq	$5,40($30)
+	stq	$6,48($30)
+	stq	$7,56($30)
+	stq	$8,64($30)
+	stq	$9,72($30)
+	stq	$10,80($30)
+	stq	$11,88($30)
+	stq	$12,96($30)
+	stq	$13,104($30)
+	stq	$14,112($30)
+	stq	$15,120($30)
+
+	stq	$30,0($17)	/* save KSP in PCB */
+
+	bis	$30,$30,$20	/* a4 = KSP */
+	br	$17,__do_swppal
+
+	ldq	$26,0($30)
+	ldq	$1,8($30)
+	ldq	$2,16($30)
+	ldq	$3,24($30)
+	ldq	$4,32($30)
+	ldq	$5,40($30)
+	ldq	$6,48($30)
+	ldq	$7,56($30)
+	ldq	$8,64($30)
+	ldq	$9,72($30)
+	ldq	$10,80($30)
+	ldq	$11,88($30)
+	ldq	$12,96($30)
+	ldq	$13,104($30)
+	ldq	$14,112($30)
+	ldq	$15,120($30)
+	addq	$30,128,$30
+	ret ($26)
+
+__do_swppal:
+	.long	PAL_swppal
+	.end	switch_to_osf_pal