David Hendricks (dhendrix@chromium.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2254
-gerrit
commit adaff84abec4a4236f85689dda387f0a9efee2fa Author: David Hendricks dhendrix@chromium.org Date: Thu Jan 31 17:05:50 2013 -0800
armv7: unify stage hand-off routines
This replaces the current stage-specific exit/entry functions with generic versions. Now all stages compile with stage_entry(), which is placed at .text.stage_entry.armv7, and stage_exit().
Snow's ramstage files are also updated to avoid build breakage.
Change-Id: I953a2c4b8121bd4b66c3362557997a9ca3aa53b0 Signed-off-by: David Hendricks dhendrix@chromium.org --- src/arch/armv7/Makefile.inc | 40 +++++++++++++----------------- src/arch/armv7/bootblock_simple.c | 8 +++--- src/arch/armv7/coreboot_ram.ld | 1 + src/arch/armv7/include/arch/stages.h | 28 +++++++++++++++++++++ src/arch/armv7/lib/Makefile.inc | 2 -- src/arch/armv7/lib/c_start.S | 9 ------- src/arch/armv7/romstage.ld | 2 +- src/arch/armv7/romstage_main.c | 29 ---------------------- src/arch/armv7/stages.c | 45 ++++++++++++++++++++++++++++++++++ src/mainboard/google/snow/Makefile.inc | 1 + src/mainboard/google/snow/mainboard.c | 2 +- src/mainboard/google/snow/ramstage.c | 32 ++++++++++++++++++++++++ 12 files changed, 131 insertions(+), 68 deletions(-)
diff --git a/src/arch/armv7/Makefile.inc b/src/arch/armv7/Makefile.inc index ba734a6..78fa671 100644 --- a/src/arch/armv7/Makefile.inc +++ b/src/arch/armv7/Makefile.inc @@ -104,6 +104,14 @@ $(objcbfs)/%.elf: $(objcbfs)/%.debug $(OBJCOPY) --add-gnu-debuglink=$< $@.tmp mv $@.tmp $@
+stages_c = $(src)/arch/armv7/stages.c +stages_o = $(obj)/arch/armv7/stages.o + +$(stages_o): $(stages_c) + @printf " CC $(subst $(obj)/,,$(@))\n" + $(CC) -Wa,-acdlns -I. $(INCLUDES) -c -o $@ $< -marm + + ################################################################################ # Build the coreboot_ram (stage 2)
@@ -115,12 +123,12 @@ else $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(src)/arch/armv7/coreboot_ram.ld $< endif
-$(objgenerated)/coreboot_ram.o: $$(ramstage-objs) $(LIBGCC_FILE_NAME) +$(objgenerated)/coreboot_ram.o: $(stages_o) $$(ramstage-objs) $(LIBGCC_FILE_NAME) @printf " CC $(subst $(obj)/,,$(@))\n" ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y) $(LD) -m -m armelf_linux_eabi -r -o $@ --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3 --wrap __uidiv --wrap __do_div64 --start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) --end-group else - $(CC) $(CFLAGS) -nostdlib -r -o $@ -Wl,--start-group $(ramstage-objs) $(LIBGCC_FILE_NAME) -Wl,--end-group + $(CC) $(CFLAGS) -nostdlib -r -o $@ -Wl,--start-group $(stages_o) $(ramstage-objs) $(LIBGCC_FILE_NAME) -Wl,--end-group endif
################################################################################ @@ -239,18 +247,11 @@ $(objgenerated)/bootblock_inc.S: $$(bootblock_inc) @printf " GEN $(subst $(obj)/,,$(@))\n" printf '$(foreach crt0,$(bootblock_inc),#include "$(crt0)"\n)' > $@
-bootblock_exit_c = $(src)/arch/armv7/bootblock_exit.c -bootblock_exit_o = $(obj)/arch/armv7/bootblock_exit.o - -$(bootblock_exit_o): $(bootblock_exit_c) - @printf " CC $(subst $(obj)/,,$(@))\n" - $(CC) -Wa,-acdlns -I. $(INCLUDES) -c -o $@ $< -marm - $(objgenerated)/bootblock.o: $(objgenerated)/bootblock.s @printf " CC $(subst $(obj)/,,$(@))\n" $(CC) -Wa,-acdlns -c -o $@ $< > $(basename $@).disasm
-BOOTBLOCK_OBJS = $(objgenerated)/bootblock.o $(bootblock_exit_o) +#BOOTBLOCK_OBJS = $(objgenerated)/bootblock.o $(bootblock_exit_o)
$(objgenerated)/bootblock.s: $(objgenerated)/bootblock_inc.S $(obj)/config.h $(obj)/build.h @printf " CC $(subst $(obj)/,,$(@))\n" @@ -262,39 +263,32 @@ $(objgenerated)/bootblock.inc: $(src)/arch/armv7/$(subst ",,$(CONFIG_BOOTBLOCK_S $< > $(objgenerated)/bootblock.inc.d $(CC) -c -S $(CFLAGS) -I. $(INCLUDES) $< -o $@
-$(objcbfs)/bootblock.debug: $(BOOTBLOCK_OBJS) $(objgenerated)/bootblock.ld +$(objcbfs)/bootblock.debug: $(objgenerated)/bootblock.o $(objgenerated)/bootblock.ld @printf " LINK $(subst $(obj)/,,$(@))\n" ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y) $(LD) -m armelf_linux_eabi -static -o $@.tmp -L$(obj) $< -T $(objgenerated)/bootblock.ld else - $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(objgenerated)/bootblock.ld -Wl,--start-group $(BOOTBLOCK_OBJS) $(LIBGCC_FILE_NAME) -Wl,--end-group + $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(objgenerated)/bootblock.ld -Wl,--start-group $(objgenerated)/bootblock.o $(stages) $(LIBGCC_FILE_NAME) -Wl,--end-group endif
################################################################################ # Build the romstage
-romstage_main_c = $(src)/arch/armv7/romstage_main.c -romstage_main_o = $(obj)/arch/armv7/romstage_main.o - -$(romstage_main_o): $(romstage_main_c) - @printf " CC $(subst $(obj)/,,$(@))\n" - $(CC) -nostdlib -nostartfiles -static -c -o $@ $< -marm - # FIXME(dhendrix): added debug printfs -$(objcbfs)/romstage_null.debug: $$(romstage-objs) $(romstage_main_o) $(objgenerated)/romstage_null.ld +$(objcbfs)/romstage_null.debug: $$(romstage-objs) $(stages_o) $(objgenerated)/romstage_null.ld @printf " LINK $(subst $(obj)/,,$(@))\n" ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y) $(LD) -nostdlib -nostartfiles -static -o $@ -L$(obj) $(romstage-objs) -T $(objgenerated)/romstage_null.ld else - $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(objgenerated)/romstage_null.ld -Wl,--start-group $(romstage-objs) $(romstage_main_o) $(LIBGCC_FILE_NAME) -Wl,--end-group + $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(objgenerated)/romstage_null.ld -Wl,--start-group $(romstage-objs) $(stages_o) $(LIBGCC_FILE_NAME) -Wl,--end-group endif
$(objcbfs)/romstage_xip.debug: $$(romstage-objs) $(objgenerated)/romstage_xip.ld @printf " LINK $(subst $(obj)/,,$(@))\n" ifeq ($(CONFIG_COMPILER_LLVM_CLANG),y) - $(LD) -nostdlib -nostartfiles -static -o $@ -L$(obj) $(romstage-objs) $(romstage_main_o) -T $(objgenerated)/romstage_xip.ld + $(LD) -nostdlib -nostartfiles -static -o $@ -L$(obj) $(romstage-objs) $(stages_o) -T $(objgenerated)/romstage_xip.ld else - $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(objgenerated)/romstage_xip.ld -Wl,--start-group $(romstage-objs) $(romstage_main_o) $(LIBGCC_FILE_NAME) -Wl,--end-group + $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(objgenerated)/romstage_xip.ld -Wl,--start-group $(romstage-objs) $(stages_o) $(LIBGCC_FILE_NAME) -Wl,--end-group endif
$(objgenerated)/romstage_null.ld: $$(ldscripts) $(obj)/ldoptions diff --git a/src/arch/armv7/bootblock_simple.c b/src/arch/armv7/bootblock_simple.c index d97075e..8df7e6a 100644 --- a/src/arch/armv7/bootblock_simple.c +++ b/src/arch/armv7/bootblock_simple.c @@ -20,9 +20,11 @@ */
#include <bootblock_common.h> -#include <arch/bootblock_exit.h> #include <arch/cbfs.h> #include <arch/hlt.h> +#include <arch/stages.h> + +#include "stages.c"
static int boot_cpu(void) { @@ -34,7 +36,7 @@ static int boot_cpu(void) return 1; }
-void main(unsigned long bist) +void main(void) { const char *target1 = "fallback/romstage"; unsigned long romstage_entry; @@ -49,6 +51,6 @@ void main(unsigned long bist) CBFS_DEFAULT_MEDIA, target1);
printk(BIOS_INFO, "bootblock main(): jumping to romstage\n"); - if (romstage_entry) bootblock_exit(romstage_entry); + if (romstage_entry) stage_exit(romstage_entry); hlt(); } diff --git a/src/arch/armv7/coreboot_ram.ld b/src/arch/armv7/coreboot_ram.ld index 329bce4..2f08d14 100644 --- a/src/arch/armv7/coreboot_ram.ld +++ b/src/arch/armv7/coreboot_ram.ld @@ -32,6 +32,7 @@ SECTIONS */ .text : { _text = .; + *(.text.stage_entry.armv7); *(.text); *(.text.*); . = ALIGN(16); diff --git a/src/arch/armv7/include/arch/stages.h b/src/arch/armv7/include/arch/stages.h new file mode 100644 index 0000000..215aaa8 --- /dev/null +++ b/src/arch/armv7/include/arch/stages.h @@ -0,0 +1,28 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 The ChromiumOS Authors + * + * 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; version 2 of the License. + * + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef __ARCH_STAGES_H +#define __ARCH_STAGES_H + +extern void main(void); + +void stage_entry(void) __attribute__((section(".text.stage_entry.armv7"))); +void stage_exit(unsigned long); + +#endif diff --git a/src/arch/armv7/lib/Makefile.inc b/src/arch/armv7/lib/Makefile.inc index d911341..e52bc54 100644 --- a/src/arch/armv7/lib/Makefile.inc +++ b/src/arch/armv7/lib/Makefile.inc @@ -9,8 +9,6 @@ romstage-y += syslib.c #ramstage-y += printk_init.c #romstage-y += walkcbfs.S
-ramstage-y += c_start.S - ramstage-y += div0.c ramstage-y += div64.S ramstage-y += hang_spl.c diff --git a/src/arch/armv7/lib/c_start.S b/src/arch/armv7/lib/c_start.S deleted file mode 100644 index b6e7462..0000000 --- a/src/arch/armv7/lib/c_start.S +++ /dev/null @@ -1,9 +0,0 @@ -.section ".text" -.globl _start -_start: - bl _hardwaremain - -_hardwaremain: .word hardwaremain -@ .word hardwaremain - - diff --git a/src/arch/armv7/romstage.ld b/src/arch/armv7/romstage.ld index b4bc29d..6728fb1 100644 --- a/src/arch/armv7/romstage.ld +++ b/src/arch/armv7/romstage.ld @@ -38,7 +38,7 @@ SECTIONS .romtext . : { _rom = .; _start = .; - *(.text.entry.armv7); + *(.text.stage_entry.armv7); *(.text.startup); *(.text); } diff --git a/src/arch/armv7/romstage_main.c b/src/arch/armv7/romstage_main.c deleted file mode 100644 index 0b463b8..0000000 --- a/src/arch/armv7/romstage_main.c +++ /dev/null @@ -1,29 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2012 The ChromiumOS Authors. All rights reserved. - * - * 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; version 2 of the License. - * - * 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, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -void main(void); - -/* romstage_main is simply a stub to invoke main(), to handle ARM mode switching - * (ARM/Thumb) properly. */ - -void romstage_main(void) __attribute__((section(".text.entry.armv7"))); -void romstage_main(void) -{ - main(); -} diff --git a/src/arch/armv7/stages.c b/src/arch/armv7/stages.c new file mode 100644 index 0000000..fd4374f --- /dev/null +++ b/src/arch/armv7/stages.c @@ -0,0 +1,45 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2012 The ChromiumOS Authors. All rights reserved. + * + * 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; version 2 of the License. + * + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * This file contains entry/exit functions for each stage during coreboot + * execution (bootblock entry and ramstage exit will depend on external + * loading. + * + * Unlike other files, this one should be compiled with a -m option to + * specify a pre-determined instruction set. The is to ensure consistency + * in the CPU operating mode (ARM or Thumb) when hand-off between stages + * occurs. + * + * Entry points must be placed at the location the previous stage jumps + * to (the lowest address in the stage image). This is done by giving + * stage_entry() its own section in .text and placing it first in the + * linker script. + */ + +#include <arch/stages.h> + +void stage_entry(void) +{ + main(); +} + +void stage_exit(unsigned long addr) +{ + __attribute__((noreturn)) void (*doit)(void) = (void *)addr; + doit(); +} diff --git a/src/mainboard/google/snow/Makefile.inc b/src/mainboard/google/snow/Makefile.inc index 26378db..a43bcbc 100644 --- a/src/mainboard/google/snow/Makefile.inc +++ b/src/mainboard/google/snow/Makefile.inc @@ -28,6 +28,7 @@ romstage-y += romstage.c romstage-y += smdk5250_spl.c ramstage-y += smdk5250_spl.c #ramstage-y += mainboard.c +ramstage-y += ramstage.c
# romstage-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/snow/mainboard.c b/src/mainboard/google/snow/mainboard.c index 00b3e93..f11f1fa 100644 --- a/src/mainboard/google/snow/mainboard.c +++ b/src/mainboard/google/snow/mainboard.c @@ -18,6 +18,7 @@ */
#include <device/device.h> +#include <console/console.h>
// mainboard_enable is executed as first thing after // enumerate_buses(). @@ -31,4 +32,3 @@ struct chip_operations mainboard_ops = { .name = "Samsung/Google ARM ChromeBook", .enable_dev = mainboard_enable, }; - diff --git a/src/mainboard/google/snow/ramstage.c b/src/mainboard/google/snow/ramstage.c new file mode 100644 index 0000000..50050d3 --- /dev/null +++ b/src/mainboard/google/snow/ramstage.c @@ -0,0 +1,32 @@ +/* + * Copyright (C) 2013 The ChromeOS Authors + * + * 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; version 2 of + * the License. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <console/console.h> + +void main(void) +{ +// volatile unsigned long *pshold = (unsigned long *)0x1004330c; +// *pshold &= ~0x100; /* shut down */ + + /* FIXME: console_init() seems to cause things to die... Maybe + we need to reset our stack pointer? */ +// console_init(); + printk(BIOS_INFO, "hello from ramstage\n"); + while (1); +}