diff options
| -rw-r--r-- | .gitignore | 4 | ||||
| -rw-r--r-- | LICENSE.txt | 28 | ||||
| -rw-r--r-- | Makefile | 79 | ||||
| -rw-r--r-- | README | 14 | ||||
| -rw-r--r-- | boot.S | 110 | ||||
| -rw-r--r-- | model.lds.S | 45 |
6 files changed, 280 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..20026d8 --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +linux-system.axf +Image +model.lds +boot.o diff --git a/LICENSE.txt b/LICENSE.txt new file mode 100644 index 0000000..d68a74e --- /dev/null +++ b/LICENSE.txt @@ -0,0 +1,28 @@ +Copyright (c) 2012, ARM Limited +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of ARM nor the names of its contributors may be + used to endorse or promote products derived from this software + without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS +IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED +TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED +TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..5e8b154 --- /dev/null +++ b/Makefile @@ -0,0 +1,79 @@ +# +# Makefile - build a kernel+filesystem image for stand-alone Linux booting +# +# Copyright (C) 2012 ARM Limited. All rights reserved. +# +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE.txt file. + +# VE +PHYS_OFFSET := 0x80000000 +UART_BASE := 0x1c090000 +GIC_DIST_BASE := 0x2c001000 +GIC_CPU_BASE := 0x2c002000 +CNTFRQ := 0x01800000 # 24Mhz + +#INITRD_FLAGS := -DUSE_INITRD +CPPFLAGS += $(INITRD_FLAGS) + +BOOTLOADER := boot.S +MBOX_OFFSET := 0xfff8 +KERNEL := Image +KERNEL_OFFSET := 0x80000 +LD_SCRIPT := model.lds.S +IMAGE := linux-system.axf + +FILESYSTEM := filesystem.cpio.gz +FS_OFFSET := 0x10000000 +FILESYSTEM_START:= $(shell echo $$(($(PHYS_OFFSET) + $(FS_OFFSET)))) +FILESYSTEM_SIZE := $(shell stat -Lc %s $(FILESYSTEM) 2>/dev/null || echo 0) +FILESYSTEM_END := $(shell echo $$(($(FILESYSTEM_START) + $(FILESYSTEM_SIZE)))) + +FDT_SRC := vexpress-v2p-aarch64.dts +FDT_INCL_REGEX := \(/include/[[:space:]]*"\)\([^"]\+\)\(".*\) +FDT_DEPS := $(FDT_SRC) $(addprefix $(dir $(FDT_SRC)), $(shell sed -ne 'sq$(strip $(FDT_INCL_REGEX)q\2q p' < $(FDT_SRC)))) +FDT_OFFSET := 0x08000000 + +ifneq (,$(findstring USE_INITRD,$(CPPFLAGS))) +BOOTARGS := "console=ttyAMA0 $(BOOTARGS_EXTRA)" +CHOSEN_NODE := chosen { \ + bootargs = $(BOOTARGS); \ + linux,initrd-start = <$(FILESYSTEM_START)>; \ + linux,initrd-end = <$(FILESYSTEM_END)>; \ + }; +else +BOOTARGS := "console=ttyAMA0 root=/dev/nfs nfsroot=10.1.69.68:/work/debootstrap/aarch64,tcp rw ip=dhcp $(BOOTARGS_EXTRA)" +CHOSEN_NODE := chosen { \ + bootargs = $(BOOTARGS); \ + }; +endif + +CROSS_COMPILE := aarch64-none-linux-gnu- +CC := $(CROSS_COMPILE)gcc +LD := $(CROSS_COMPILE)ld +DTC := $(if $(wildcard ./dtc), ./dtc, $(shell which dtc)) + +all: $(IMAGE) + +clean: + rm -f $(IMAGE) boot.o model.lds fdt.dtb + +$(IMAGE): boot.o model.lds fdt.dtb $(KERNEL) $(FILESYSTEM) + $(LD) -o $@ --script=model.lds + +boot.o: $(BOOTLOADER) Makefile + $(CC) $(CPPFLAGS) -DCNTFRQ=$(CNTFRQ) -DUART_BASE=$(UART_BASE) -DSYS_FLAGS=$(SYS_FLAGS) -DGIC_DIST_BASE=$(GIC_DIST_BASE) -DGIC_CPU_BASE=$(GIC_CPU_BASE) -c -o $@ $(BOOTLOADER) + +model.lds: $(LD_SCRIPT) Makefile + $(CC) $(CPPFLAGS) -DPHYS_OFFSET=$(PHYS_OFFSET) -DMBOX_OFFSET=$(MBOX_OFFSET) -DKERNEL_OFFSET=$(KERNEL_OFFSET) -DFDT_OFFSET=$(FDT_OFFSET) -DFS_OFFSET=$(FS_OFFSET) -DKERNEL=$(KERNEL) -DFILESYSTEM=$(FILESYSTEM) -E -P -C -o $@ $< + +ifeq ($(DTC),) + $(error No dtc found! You can git clone from git://git.jdl.com/software/dtc.git) +endif + +fdt.dtb: $(FDT_DEPS) Makefile + @sed -e 's%/\* chosen \*/%$(CHOSEN_NODE)%' -e 's%$(strip $(FDT_INCL_REGEX))%\1$(dir $(FDT_SRC))\2\3%' $< | \ + $(DTC) -O dtb -o $@ - + +# The filesystem archive might not exist if INITRD is not being used +.PHONY: all clean $(FILESYSTEM) @@ -0,0 +1,14 @@ +Linux boot wrapper with FDT support +=================================== + +The following files need to be linked into the boot wrapper directory: + +dtc - point to <linux-build-dir>/scripts/dtc/dtc +vexpress-v2p-aarch64.dts - point to <linux-src-dir>/arch/arm64/boot/dts/vexpress-v2p-aarch64.dts +vexpress-v2m-rs1.dtsi - point to <linux-src-dir>/arch/arm64/boot/dts/vexpress-v2m-rs1.dtsi +skeleton.dtsi - point to <linux-src-dir>/arch/arm64/boot/dts/skeleton.dtsi + +Alternatively, you may specify the paths for dtc and the main dts file +on the make command-line. For example: + +make DTC=<path-to-dtc> FDT_SRC=<linux-src-dir>/arch/arm64/boot/dts/vexpress-v2p-aarch64.dtsi @@ -0,0 +1,110 @@ +/* + * boot.S - simple register setup code for stand-alone Linux booting + * + * Copyright (C) 2012 ARM Limited. All rights reserved. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE.txt file. + */ + + .text + + .globl _start +_start: + /* + * EL3 initialisation + */ + mrs x0, CurrentEL + cmp x0, #0xc // EL3? + b.ne start_ns // skip EL3 initialisation + + mov x0, #0x30 // RES1 + orr x0, x0, #(1 << 0) // Non-secure EL1 + orr x0, x0, #(1 << 8) // HVC enable + orr x0, x0, #(1 << 10) // 64-bit EL2 + msr scr_el3, x0 + + msr cptr_el3, xzr // Disable copro. traps to EL3 + + ldr x0, =CNTFRQ + msr cntfrq_el0, x0 + + /* + * Check for the primary CPU to avoid a race on the distributor + * registers. + */ + mrs x0, mpidr_el1 + tst x0, #15 + b.ne 1f // secondary CPU + + ldr x1, =GIC_DIST_BASE // GICD_CTLR + mov w0, #3 // EnableGrp0 | EnableGrp1 + str w0, [x1] + +1: ldr x1, =GIC_DIST_BASE + 0x80 // GICD_IGROUPR + mov w0, #~0 // Grp1 interrupts + str w0, [x1], #4 + b.ne 2f // Only local interrupts for secondary CPUs + str w0, [x1], #4 + str w0, [x1], #4 + +2: ldr x1, =GIC_CPU_BASE // GICC_CTLR + ldr w0, [x1] + mov w0, #3 // EnableGrp0 | EnableGrp1 + str w0, [x1] + + mov w0, #1 << 7 // allow NS access to GICC_PMR + str w0, [x1, #4] // GICC_PMR + + msr sctlr_el2, xzr + + /* + * Prepare the switch to the EL2_SP1 mode from EL3 + */ + ldr x0, =start_ns // Return after mode switch + mov x1, #0x3c9 // EL2_SP1 | D | A | I | F + msr elr_el3, x0 + msr spsr_el3, x1 + eret + +start_ns: + /* + * Kernel parameters + */ + mov x0, xzr + mov x1, xzr + mov x2, xzr + mov x3, xzr + + mrs x4, mpidr_el1 + tst x4, #15 + b.eq 2f + + /* + * Secondary CPUs + */ +1: wfe + ldr x4, mbox + cbz x4, 1b + br x4 // branch to the given address + +2: + /* + * UART initialisation (38400 8N1) + */ + ldr x4, =UART_BASE // UART base + mov w5, #0x10 // ibrd + str w5, [x4, #0x24] + mov w5, #0xc300 + orr w5, w5, #0x0001 // cr + str w5, [x4, #0x30] + + /* + * Primary CPU + */ + ldr x0, =dtb // device tree blob + b kernel + + .ltorg + + .org 0x200 diff --git a/model.lds.S b/model.lds.S new file mode 100644 index 0000000..ec27433 --- /dev/null +++ b/model.lds.S @@ -0,0 +1,45 @@ +/* + * model.lds.S - simple linker script for stand-alone Linux booting + * + * Copyright (C) 2012 ARM Limited. All rights reserved. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE.txt file. + */ + +OUTPUT_FORMAT("elf64-littleaarch64") +OUTPUT_ARCH(aarch64) +TARGET(binary) + +INPUT(./boot.o) +INPUT(KERNEL) +INPUT(./fdt.dtb) + +#ifdef USE_INITRD +INPUT(FILESYSTEM) +#endif + +SECTIONS +{ + . = PHYS_OFFSET; + .text : { boot.o } + . = PHYS_OFFSET + MBOX_OFFSET; + mbox = .; + .mbox : { QUAD(0x0) } + . = PHYS_OFFSET + KERNEL_OFFSET; + kernel = .; + .kernel : { KERNEL } + + . = PHYS_OFFSET + FDT_OFFSET; + dtb = .; + .dtb : { ./fdt.dtb } + . = PHYS_OFFSET + FS_OFFSET; + filesystem = .; +#ifdef USE_INITRD + .filesystem : { FILESYSTEM } + fs_size = . - filesystem; +#endif + + .data : { *(.data) } + .bss : { *(.bss) } +} |