Add missing file boot_mips.S to the repo

doc/boot_mips.S

@@ -0,0 +1,119 @@
+/* boot.S - bootstrap the kernel */
+/* Copyright (C) 1999, 2001, 2010  Free Software Foundation, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define ASM_FILE	1
+#include <multiboot2.h>
+
+/* C symbol format. HAVE_ASM_USCORE is defined by configure.  */
+#ifdef HAVE_ASM_USCORE
+# define EXT_C(sym)			_ ## sym
+#else
+# define EXT_C(sym)			sym
+#endif
+
+/* The size of our stack (16KB).  */
+#define STACK_SIZE			0x4000
+
+/* The flags for the Multiboot header.  */
+#ifdef __ELF__
+# define AOUT_KLUDGE 0
+#else
+# define AOUT_KLUDGE MULTIBOOT_AOUT_KLUDGE
+#endif
+	
+	.text
+	.set noreorder
+        .set nomacro
+
+	.globl	start, _start
+start:
+_start:
+	b	multiboot_entry
+	 nop
+
+	/* Align 64 bits boundary.  */
+	.align	8
+	
+	/* Multiboot header.  */
+multiboot_header:
+	/* magic */
+	.long	MULTIBOOT2_HEADER_MAGIC
+	/* ISA: mips32 */
+	.long   MULTIBOOT_ARCHITECTURE_MIPS32
+	/* Header length.  */
+	.long	multiboot_header_end - multiboot_header
+	/* checksum */
+	.long	-(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT_ARCHITECTURE_MIPS32 + (multiboot_header_end - multiboot_header))
+#ifndef __ELF__
+address_tag_start:	
+	.short MULTIBOOT_HEADER_TAG_ADDRESS
+	.short MULTIBOOT_HEADER_TAG_OPTIONAL
+	.long address_tag_end - address_tag_start
+	/* header_addr */
+	.long	multiboot_header
+	/* load_addr */
+	.long	_start
+	/* load_end_addr */
+	.long	_edata
+	/* bss_end_addr */
+	.long	_end
+address_tag_end:
+entry_address_tag_start:	
+	.short MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS
+	.short MULTIBOOT_HEADER_TAG_OPTIONAL
+	.long entry_address_tag_end - entry_address_tag_start
+	/* entry_addr */
+	.long multiboot_entry
+entry_address_tag_end:
+#endif /* __ELF__ */
+framebuffer_tag_start:	
+	.short MULTIBOOT_HEADER_TAG_FRAMEBUFFER
+	.short MULTIBOOT_HEADER_TAG_OPTIONAL
+	.long framebuffer_tag_end - framebuffer_tag_start
+	.long 1024
+	.long 768
+	.long 32
+framebuffer_tag_end:
+	.short MULTIBOOT_HEADER_TAG_END
+	.short 0
+	.long 8
+multiboot_header_end:
+multiboot_entry:
+	/* Initialize the stack pointer.  */
+	lui     $sp, %hi (stack + STACK_SIZE)
+	addiu   $sp, $sp, %lo (stack + STACK_SIZE)
+
+	/* Now enter the C main function...  */
+	bal	EXT_C(cmain)
+	 nop
+
+	/* Halt.  */
+	lui	$a0, %hi (halt_message)
+	addiu	$a0, $a0, %lo (halt_message)
+	bal	EXT_C(printf)
+	 nop
+	
+loop:	nop
+	b loop
+	 nop
+
+halt_message:
+	.asciz	"Halted."
+
+	.align 8
+	/* Our stack area.  */
+	.comm	stack, STACK_SIZE