Recommit my work on alpha

grub-core/kern/alpha/srm/startup.S

@@ -0,0 +1,54 @@
+#include <config.h>
+#include <grub/symbol.h>
+#include <grub/offsets.h>
+
+	.set noreorder
+	.globl	_start
+	.ent	_start
+_start:
+	.prologue 0
+	/* load GP.  */
+	br	$27, 1f
+1:	ldgp	$29, 0($27)
+
+	/* Move modules out of the BSS. */
+	lda     $1, __bss_start
+	lda     $2, _end
+	lda     $4, modsize
+	ldq     $3, 0($4)
+	addq    $3, 7, $3
+	sra     $3, 3, $3
+	sll     $3, 3, $4
+	subq    $4, 8, $4
+	addq    $1, $4, $1
+	addq    $2, $4, $2
+
+2:
+	beq     $3, 3f
+	ldq     $4, 0($1)
+	stq     $4, 0($2)
+	subq    $3, 1, $3
+	subq    $1, 8, $1
+	subq    $2, 8, $2
+	br      2b
+3:	
+
+	/* Clean BSS.  */
+	lda     $1, __bss_start
+	lda     $2, _end
+	subq    $2, $1, $2
+	sra     $2, 3, $2
+2:
+	beq     $2, 3f
+	stq     $31, 0($1)
+	subq    $2, 1, $2
+	addq    $1, 8, $1
+	br      2b
+3:
+	/* call main.  */
+	lda	$27, EXT_C (grub_main)
+	jmp	($27)
+	.end _start
+	. = _start + GRUB_KERNEL_ALPHA_SRM_TOTAL_MODULE_SIZE
+modsize:
+	.quad 0