Tiny Bootblock, step 1/n.

Introduce the tiny bootblock infrastructure and use it on QEmu.

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Myles Watson <mylesgw@gmail.com>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4989 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

7 files changed, 289 insertions, 31 deletions

diff --git a/src/arch/i386/Kconfig b/src/arch/i386/Kconfig
index c2f023f2b1..19bd63a0d4 100644
--- a/src/arch/i386/Kconfig
+++ b/src/arch/i386/Kconfig
@@ -40,3 +40,6 @@ config MAX_REBOOT_CNT
 	int
 	default 3
 
+config TINY_BOOTBLOCK
+	bool
+	default n
diff --git a/src/arch/i386/Makefile.bigbootblock.inc b/src/arch/i386/Makefile.bigbootblock.inc
new file mode 100644
index 0000000000..06af5d2b64
--- /dev/null
+++ b/src/arch/i386/Makefile.bigbootblock.inc
@@ -0,0 +1,35 @@
+ifdef POST_EVALUATION
+
+#######################################################################
+# Build the final rom image
+
+$(obj)/coreboot.pre: $(obj)/coreboot.bootblock $(CBFSTOOL)
+	rm -f $@
+	$(CBFSTOOL) $@ create $(CONFIG_COREBOOT_ROMSIZE_KB)K $(obj)/coreboot.bootblock
+
+#######################################################################
+# Build the bootblock
+
+$(obj)/coreboot.bootblock: $(obj)/coreboot
+	@printf "    OBJCOPY    $(subst $(obj)/,,$(@))\n"
+	$(OBJCOPY) -O binary $< $@
+
+$(obj)/ldscript.ld: $(ldscripts) $(obj)/ldoptions
+	printf 'INCLUDE "ldoptions"\n' > $@
+	printf '$(foreach ldscript,$(ldscripts),INCLUDE "$(ldscript:$(obj)/%=%)"\n)' >> $@
+
+$(obj)/crt0_includes.h: $(crt0s)
+	printf '$(foreach crt0,config.h $(crt0s),#include "$(crt0:$(obj)/%=%)"\n)' > $@
+
+$(obj)/mainboard/$(MAINBOARDDIR)/crt0.o: $(obj)/mainboard/$(MAINBOARDDIR)/crt0.s
+	$(CC) -I$(obj) -Wa,-acdlns -c -o $@ $<  > $(dir $@)/crt0.disasm
+
+$(obj)/mainboard/$(MAINBOARDDIR)/crt0.s: $(src)/arch/i386/init/crt0.S.lb $(obj)/crt0_includes.h
+	$(CC) -x assembler-with-cpp -DASSEMBLY -E -I$(src)/include -I$(src)/arch/i386/include -I$(obj) -include $(obj)/config.h -I. -I$(src) $< > $@.new && mv $@.new $@
+
+$(obj)/coreboot: $(initobjs) $(obj)/ldscript.ld
+	@printf "    LINK       $(subst $(obj)/,,$(@))\n"
+	$(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(obj)/ldscript.ld $(initobjs)
+	$(NM) -n $(obj)/coreboot | sort > $(obj)/coreboot.map
+
+endif
diff --git a/src/arch/i386/Makefile.inc b/src/arch/i386/Makefile.inc
index e2f464d285..ef4b90af0c 100644
--- a/src/arch/i386/Makefile.inc
+++ b/src/arch/i386/Makefile.inc
@@ -11,10 +11,8 @@ ifdef POST_EVALUATION
 
 #######################################################################
 # Build the final rom image
-
-$(obj)/coreboot.rom: $(obj)/coreboot.bootblock $(obj)/coreboot_ram $(CBFSTOOL)
-	rm -f $@
-	$(CBFSTOOL) $@ create $(CONFIG_COREBOOT_ROMSIZE_KB)K $(obj)/coreboot.bootblock
+$(obj)/coreboot.rom: $(obj)/coreboot.pre $(obj)/coreboot_ram $(CBFSTOOL)
+	cp $(obj)/coreboot.pre $@
 	if [ -f fallback/coreboot_apc ]; \
 	then \
 		$(CBFSTOOL) $@ add-stage fallback/coreboot_apc fallback/coreboot_apc $(CBFS_COMPRESS_FLAG); \
@@ -33,36 +31,10 @@ endif
 	@printf "    CBFSPRINT  $(subst $(obj)/,,$(@))\n\n"
 	$(CBFSTOOL) $(obj)/coreboot.rom print
 
-
-#######################################################################
-# Build the bootblock
-
-$(obj)/coreboot.bootblock: $(obj)/coreboot
-	@printf "    OBJCOPY    $(subst $(obj)/,,$(@))\n"
-	$(OBJCOPY) -O binary $< $@
-
-$(obj)/ldscript.ld: $(ldscripts) $(obj)/ldoptions
-	printf 'INCLUDE "ldoptions"\n' > $@
-	printf '$(foreach ldscript,$(ldscripts),INCLUDE "$(ldscript:$(obj)/%=%)"\n)' >> $@
-
-$(obj)/crt0_includes.h: $(crt0s)
-	printf '$(foreach crt0,config.h $(crt0s),#include "$(crt0:$(obj)/%=%)"\n)' > $@
-
-$(obj)/mainboard/$(MAINBOARDDIR)/crt0.o: $(obj)/mainboard/$(MAINBOARDDIR)/crt0.s
-	$(CC) -I$(obj) -Wa,-acdlns -c -o $@ $<  > $(dir $@)/crt0.disasm
-
-$(obj)/mainboard/$(MAINBOARDDIR)/crt0.s: $(src)/arch/i386/init/crt0.S.lb $(obj)/crt0_includes.h
-	$(CC) -x assembler-with-cpp -DASSEMBLY -E -I$(src)/include -I$(src)/arch/i386/include -I$(obj) -include $(obj)/config.h -I. -I$(src) $< > $@.new && mv $@.new $@
-
-$(obj)/coreboot: $(initobjs) $(obj)/ldscript.ld
-	@printf "    LINK       $(subst $(obj)/,,$(@))\n"
-	$(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(obj)/ldscript.ld $(initobjs)
-	$(NM) -n $(obj)/coreboot | sort > $(obj)/coreboot.map
-
 #######################################################################
 # i386 specific tools
 
-$(obj)/option_table.h $(obj)/option_table.c: $(obj)/build_opt_tbl $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout
+$(obj)/option_table.h $(obj)/option_table.c $(obj)/arch/i386/../../option_table.c: $(obj)/build_opt_tbl $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout
 	@printf "    OPTION     $(subst $(obj)/,,$(@))\n"
 	$(obj)/build_opt_tbl --config $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout --header $(obj)/option_table.h --option $(obj)/option_table.c
 
@@ -91,3 +63,9 @@ $(obj)/coreboot.a: $(objs)
 # done
 
 endif
+
+ifeq ($(CONFIG_TINY_BOOTBLOCK),y)
+include $(src)/arch/i386/Makefile.tinybootblock.inc
+else
+include $(src)/arch/i386/Makefile.bigbootblock.inc
+endif
diff --git a/src/arch/i386/Makefile.tinybootblock.inc b/src/arch/i386/Makefile.tinybootblock.inc
new file mode 100644
index 0000000000..86a71a8b7e
--- /dev/null
+++ b/src/arch/i386/Makefile.tinybootblock.inc
@@ -0,0 +1,87 @@
+ifdef POST_EVALUATION
+
+#######################################################################
+# Build the final rom image
+
+$(obj)/coreboot.pre1: $(obj)/coreboot.bootblock $(CBFSTOOL)
+	rm -f $@
+	$(CBFSTOOL) $@ create $(CONFIG_COREBOOT_ROMSIZE_KB)K $(obj)/coreboot.bootblock
+
+$(obj)/coreboot.pre: $(obj)/coreboot.romstage $(obj)/coreboot.pre1 $(CBFSTOOL)
+	rm -f $@
+	cp $(obj)/coreboot.pre1 $@
+	$(CBFSTOOL) $@ add-stage $(obj)/romstage.elf fallback/romstage x 0x$(shell cat $(obj)/location.txt)
+#FIXME: location.txt might require an offset of header size
+
+#######################################################################
+# Build the bootblock
+
+$(obj)/coreboot.bootblock: $(obj)/bootblock.elf
+	@printf "    OBJCOPY    $(subst $(obj)/,,$(@))\n"
+	$(OBJCOPY) -O binary $< $@
+
+bootblock_lds := $(src)/arch/i386/init/ldscript_failover.lb
+bootblock_lds += $(src)/cpu/x86/16bit/entry16.lds
+bootblock_lds += $(src)/cpu/x86/16bit/reset16.lds
+bootblock_lds += $(src)/arch/i386/lib/id.lds
+
+bootblock_inc := $(src)/arch/i386/init/bootblock_prologue.c
+bootblock_inc += $(src)/cpu/x86/16bit/entry16.inc
+bootblock_inc += $(src)/cpu/x86/16bit/reset16.inc
+bootblock_inc += $(src)/cpu/x86/32bit/entry32.inc
+bootblock_inc += $(src)/arch/i386/lib/id.inc
+bootblock_inc += $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc
+bootblock_inc += $(src)/arch/i386/lib/walkcbfs.S
+
+$(obj)/bootblock/ldscript.ld: $(bootblock_ldscripts) $(obj)/ldoptions
+	mkdir -p $(obj)/bootblock
+	printf '$(foreach ldscript,ldoptions $(bootblock_lds),INCLUDE "$(ldscript)"\n)' > $@
+
+$(obj)/bootblock/bootblock.c: $(bootblock_inc)
+	mkdir -p $(obj)/bootblock
+	printf '$(foreach crt0,config.h $(bootblock_inc),#include "$(crt0)"\n)' > $@
+
+$(obj)/mainboard/$(MAINBOARDDIR)/bootblock.o: $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.s
+	$(CC) -I$(obj) -Wa,-acdlns -c -o $@ $<  > $(dir $@)/crt0.disasm
+
+$(obj)/mainboard/$(MAINBOARDDIR)/bootblock.s: $(obj)/bootblock/bootblock.c
+	$(CC) -x assembler-with-cpp -DASSEMBLY -E -I$(src)/include -I$(src)/arch/i386/include -I$(obj) -I$(obj)/bootblock -include $(obj)/config.h -I. -I$(src) $< > $@.new && mv $@.new $@
+
+$(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc: $(obj)/romcc $(src)/arch/i386/init/bootblock.c
+	$(obj)/romcc $(ROMCCFLAGS) $(INCLUDES) $(src)/arch/i386/init/bootblock.c -o $@
+
+$(obj)/bootblock.elf: $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.o $(obj)/bootblock/ldscript.ld
+	@printf "    LINK       $(subst $(obj)/,,$(@))\n"
+	$(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(obj)/bootblock/ldscript.ld $<
+	$(NM) -n $(obj)/bootblock.elf | sort > $(obj)/bootblock.map
+
+#######################################################################
+# Build the romstage
+$(obj)/coreboot.romstage: $(obj)/coreboot.pre1 $(initobjs) $(obj)/romstage/ldscript.ld
+	@printf "    LINK       $(subst $(obj)/,,$(@))\n"
+	printf "CONFIG_ROMBASE = 0x0;\n" > $(obj)/location.ld
+	$(CC) -nostdlib -nostartfiles -static -o $(obj)/romstage.elf -L$(obj) -T $(obj)/romstage/ldscript.ld $(initobjs)
+	$(OBJCOPY) -O binary $(obj)/romstage.elf $(obj)/romstage.bin
+	printf "CONFIG_ROMBASE = 0x" > $(obj)/location.ld
+	$(CBFSTOOL) $(obj)/coreboot.pre1 locate $(obj)/romstage.bin fallback/romstage $(CONFIG_XIP_ROM_SIZE) > $(obj)/location.txt
+	cat $(obj)/location.txt >> $(obj)/location.ld
+	printf ";\n" >> $(obj)/location.ld
+	$(CC) -nostdlib -nostartfiles -static -o $(obj)/romstage.elf -L$(obj) -T $(obj)/romstage/ldscript.ld $(initobjs)
+	$(NM) -n $(obj)/romstage.elf | sort > $(obj)/romstage.map
+	$(OBJCOPY) -O binary $(obj)/romstage.elf $@
+
+$(obj)/romstage/ldscript.ld: $(ldscripts) $(obj)/ldoptions
+	mkdir -p $(obj)/romstage
+	printf '$(foreach ldscript,ldoptions location.ld $(ldscripts),INCLUDE "$(ldscript:$(obj)/%=%)"\n)' > $@
+
+$(obj)/romstage/crt0_includes.h: $(crt0s)
+	mkdir -p $(obj)/romstage
+	printf '$(foreach crt0,config.h $(crt0s),#include "$(crt0:$(obj)/%=%)"\n)' > $@
+
+$(obj)/mainboard/$(MAINBOARDDIR)/crt0.o: $(obj)/mainboard/$(MAINBOARDDIR)/crt0.s
+	$(CC) -I$(obj) -Wa,-acdlns -c -o $@ $<  > $(dir $@)/crt0.disasm
+
+$(obj)/mainboard/$(MAINBOARDDIR)/crt0.s: $(src)/arch/i386/init/crt0.S.lb $(obj)/romstage/crt0_includes.h
+	$(CC) -x assembler-with-cpp -DASSEMBLY -E -I$(src)/include -I$(src)/arch/i386/include -I$(obj) -I$(obj)/romstage -include $(obj)/config.h -I. -I$(src) $< > $@.new && mv $@.new $@
+
+endif
diff --git a/src/arch/i386/init/bootblock.c b/src/arch/i386/init/bootblock.c
new file mode 100644
index 0000000000..eea0198d00
--- /dev/null
+++ b/src/arch/i386/init/bootblock.c
@@ -0,0 +1,24 @@
+static unsigned long findstage(char* target)
+{
+	unsigned long entry;
+	asm volatile (
+		"mov $1f, %%esp\n\t"
+		"jmp walkcbfs\n\t"
+		"1:\n\t" : "=a" (entry) : "S" (target) : "ebx", "ecx", "edx", "edi", "ebp", "esp");
+	return entry;
+}
+
+static void call(unsigned long addr)
+{
+	asm volatile ("jmp %0\n\t" : : "r" (addr));
+}
+
+static void main(void)
+{
+	const char* target1 = "fallback/romstage";
+	unsigned long entry;
+	entry = findstage(target1);
+	if (entry) call(entry);
+	asm volatile ("1:\n\thlt\n\tjmp 1b\n\t");
+}
+
diff --git a/src/arch/i386/init/bootblock_prologue.c b/src/arch/i386/init/bootblock_prologue.c
new file mode 100644
index 0000000000..f921c3f8d0
--- /dev/null
+++ b/src/arch/i386/init/bootblock_prologue.c
@@ -0,0 +1,37 @@
+/* -*- asm -*-
+ * $ $
+ *
+ */
+
+/* 
+ * Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
+ *
+ * This file 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 2 of
+ * the License, or (at your option) any later version.
+ *
+ * Originally this code was part of ucl the data compression library
+ * for upx the ``Ultimate Packer of eXecutables''.
+ *
+ * - Converted to gas assembly, and refitted to work with etherboot.
+ *   Eric Biederman 20 Aug 2002
+ * - Merged the nrv2b decompressor into crt0.base of coreboot
+ *   Eric Biederman 26 Sept 2002
+ */
+
+
+#include <arch/asm.h>
+#include <arch/intel.h>
+#include <console/loglevel.h>	
+
+/*
+ * This is the entry code the code in .reset section
+ * jumps to this address.
+ *
+ */
+.section ".rom.data", "a", @progbits
+.section ".rom.text", "ax", @progbits
+
+	intel_chip_post_macro(0x01)             /* delay for chipsets */
+
diff --git a/src/arch/i386/lib/walkcbfs.S b/src/arch/i386/lib/walkcbfs.S
new file mode 100644
index 0000000000..aba0453d1f
--- /dev/null
+++ b/src/arch/i386/lib/walkcbfs.S
@@ -0,0 +1,94 @@
+#define CBFS_HEADER_PTR 0xfffffffc
+
+#define CBFS_HEADER_MAGIC 0
+#define CBFS_HEADER_VERSION (CBFS_HEADER_MAGIC + 4)
+#define CBFS_HEADER_ROMSIZE (CBFS_HEADER_VERSION + 4)
+#define CBFS_HEADER_BOOTBLOCKSIZE (CBFS_HEADER_ROMSIZE + 4)
+#define CBFS_HEADER_ALIGN (CBFS_HEADER_BOOTBLOCKSIZE + 4)
+#define CBFS_HEADER_OFFSET (CBFS_HEADER_ALIGN + 4)
+
+#define CBFS_FILE_MAGIC 0
+#define CBFS_FILE_LEN (CBFS_FILE_MAGIC + 8)
+#define CBFS_FILE_TYPE (CBFS_FILE_LEN + 4)
+#define CBFS_FILE_CHECKSUM (CBFS_FILE_TYPE + 4)
+#define CBFS_FILE_OFFSET (CBFS_FILE_CHECKSUM + 4)
+
+#define CBFS_FILE_STRUCTSIZE (CBFS_FILE_OFFSET + 4)
+
+#define CBFS_STAGE_COMPRESSION 0
+#define CBFS_STAGE_ENTRY (CBFS_STAGE_COMPRESSION + 4)
+#define CBFS_STAGE_LOAD (CBFS_STAGE_ENTRY + 8)
+#define CBFS_STAGE_LEN (CBFS_STAGE_LOAD + 8)
+#define CBFS_STAGE_MEMLEN (CBFS_STAGE_LEN + 4)
+
+/*
+  input %esi: filename
+  input %esp: return address (not pointer to return address!)
+  output %eax: entry point
+  clobbers %ebx, %ecx, %edx, %edi, %ebp
+*/
+walkcbfs:
+	mov %esi, %ebp /* stash away filename pointer */
+	mov $0, %edx
+1:
+	cmpb $0, (%edx,%esi)
+	jz 2f
+	add $1, %edx
+	jmp 1b
+2:
+	add $1, %edx
+	mov CBFS_HEADER_PTR, %eax
+	mov CBFS_HEADER_ROMSIZE(%eax), %ecx
+	bswap %ecx
+	mov $0, %ebx
+	sub %ecx, %ebx
+	mov CBFS_HEADER_OFFSET(%eax), %ecx
+	bswap %ecx
+	add %ecx, %ebx
+	mov CBFS_HEADER_ALIGN(%eax), %eax
+	bswap %eax
+	sub $1, %eax
+
+walker:
+	mov %ebp, %esi
+	mov %ebx, %edi
+	add $CBFS_FILE_STRUCTSIZE, %edi /* edi = address of first byte after struct cbfs_file */
+	mov %edx, %ecx
+	repe cmpsb
+	# zero flag set if strings are equal
+	jnz tryharder
+
+	# we found it!
+	mov CBFS_FILE_OFFSET(%ebx), %eax
+	bswap %eax
+	add %ebx, %eax
+	add $CBFS_STAGE_ENTRY, %eax /* eax = ((cbfs_stage* (cbfs_file* ebx)->offset)->entry) */
+	mov 0(%eax), %eax
+	jmp *%esp
+
+tryharder:
+	mov CBFS_FILE_OFFSET(%ebx), %ecx
+	bswap %ecx
+	add %ebx, %ecx
+	mov CBFS_FILE_LEN(%ebx), %edi
+	bswap %edi
+	add %edi, %ecx
+	add %eax, %ecx
+	mov %eax, %edi
+	not %edi
+	and %edi, %ecx
+	mov %ecx, %ebx
+
+	/* look if we should exit */
+	mov CBFS_HEADER_PTR, %esi
+	mov CBFS_HEADER_ROMSIZE(%esi), %ecx
+	bswap %ecx
+	not %ecx
+	add $1, %ecx
+
+	cmp %ebx, %ecx
+	/* if we're still inside the ROM area, jump back */
+	jbe walker
+
+	mov $0, %eax
+	jmp *%esp