diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arm/boot/bootp/Makefile | 60 | ||||
| -rw-r--r-- | arch/arm/boot/bootp/bootp.lds | 27 | ||||
| -rw-r--r-- | arch/arm/boot/bootp/init.S | 85 | ||||
| -rw-r--r-- | arch/arm/boot/bootp/initrd.S | 7 | ||||
| -rw-r--r-- | arch/arm/boot/bootp/kernel.S | 7 |
5 files changed, 186 insertions, 0 deletions
diff --git a/arch/arm/boot/bootp/Makefile b/arch/arm/boot/bootp/Makefile new file mode 100644 index 000000000..a2934e6fd --- /dev/null +++ b/arch/arm/boot/bootp/Makefile @@ -0,0 +1,60 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# linux/arch/arm/boot/bootp/Makefile +# +# This file is included by the global makefile so that you can add your own +# architecture-specific flags and dependencies. +# +GCOV_PROFILE := n + +ifdef PHYS_OFFSET +add_hex = $(shell printf 0x%x $$(( $(1) + $(2) )) ) + +# If PHYS_OFFSET is set, INITRD_PHYS and PARAMS_PHYS can be derived, +# otherwise they must be passed on the command line. +# +# Note: the following conditions must always be true: +# PARAMS_PHYS must be within 4MB of ZRELADDR +# INITRD_PHYS must be in RAM + +PARAMS_PHYS := $(call add_hex, $(PHYS_OFFSET), 0x100) + +# guess an initrd location if possible +initrd_offset-$(CONFIG_ARCH_FOOTBRIDGE) += 0x00800000 +initrd_offset-$(CONFIG_ARCH_SA1100) += 0x00800000 +initrd_offset-$(CONFIG_ARCH_RPC) += 0x08000000 +INITRD_OFFSET := $(initrd_offset-y) +ifdef INITRD_OFFSET +INITRD_PHYS := $(call add_hex, $(PHYS_OFFSET), $(INITRD_OFFSET)) +endif + +endif + +PHONY += initrd +initrd: + @test "$(PARAMS_PHYS)" != "" || \ + (echo bootpImage: You must specify PHYS_OFFSET of PARAMS_PHYS ; exit -1) + @test "$(INITRD_PHYS)" != "" || \ + (echo bootpImage: You must specify INITRD_OFFSET or INITRD_PHYS ; exit -1) + @test "$(INITRD)" != "" || \ + (echo bootpImage: You must specify INITRD; exit -1) + +LDFLAGS_bootp := --no-undefined -X \ + --defsym initrd_phys=$(INITRD_PHYS) \ + --defsym params_phys=$(PARAMS_PHYS) -T +AFLAGS_initrd.o :=-DINITRD=\"$(INITRD)\" + +targets := bootp init.o kernel.o initrd.o + +# Note that bootp.lds picks up kernel.o and initrd.o +$(obj)/bootp: $(src)/bootp.lds $(addprefix $(obj)/,init.o kernel.o initrd.o) FORCE + $(call if_changed,ld) + +# kernel.o and initrd.o includes a binary image using +# .incbin, a dependency which is not tracked automatically + +$(obj)/kernel.o: arch/arm/boot/zImage FORCE + +$(obj)/initrd.o: initrd $(INITRD) FORCE + +PHONY += $(INITRD) diff --git a/arch/arm/boot/bootp/bootp.lds b/arch/arm/boot/bootp/bootp.lds new file mode 100644 index 000000000..160128186 --- /dev/null +++ b/arch/arm/boot/bootp/bootp.lds @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/boot/bootp/bootp.lds + * + * Copyright (C) 2000-2002 Russell King + */ +OUTPUT_ARCH(arm) +ENTRY(_start) +SECTIONS +{ + . = 0; + .text : { + _stext = .; + *(.start) + *(.text) + initrd_size = initrd_end - initrd_start; + _etext = .; + } + + .stab 0 : { *(.stab) } + .stabstr 0 : { *(.stabstr) } + .stab.excl 0 : { *(.stab.excl) } + .stab.exclstr 0 : { *(.stab.exclstr) } + .stab.index 0 : { *(.stab.index) } + .stab.indexstr 0 : { *(.stab.indexstr) } + .comment 0 : { *(.comment) } +} diff --git a/arch/arm/boot/bootp/init.S b/arch/arm/boot/bootp/init.S new file mode 100644 index 000000000..b562da2f7 --- /dev/null +++ b/arch/arm/boot/bootp/init.S @@ -0,0 +1,85 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/boot/bootp/init.S + * + * Copyright (C) 2000-2003 Russell King. + * + * "Header" file for splitting kernel + initrd. Note that we pass + * r0 through to r3 straight through. + * + * This demonstrates how to append code to the start of the kernel + * zImage, and boot the kernel without copying it around. This + * example would be simpler; if we didn't have an object of unknown + * size immediately following the kernel, we could build this into + * a binary blob, and concatenate the zImage using the cat command. + */ + .section .start, "ax" + .type _start, #function + .globl _start + +_start: add lr, pc, #-0x8 @ lr = current load addr + adr r13, data + ldmia r13!, {r4-r6} @ r5 = dest, r6 = length + add r4, r4, lr @ r4 = initrd_start + load addr + bl move @ move the initrd + +/* + * Setup the initrd parameters to pass to the kernel. This can only be + * passed in via the tagged list. + */ + ldmia r13, {r5-r9} @ get size and addr of initrd + @ r5 = ATAG_CORE + @ r6 = ATAG_INITRD2 + @ r7 = initrd start + @ r8 = initrd end + @ r9 = param_struct address + + ldr r10, [r9, #4] @ get first tag + teq r10, r5 @ is it ATAG_CORE? +/* + * If we didn't find a valid tag list, create a dummy ATAG_CORE entry. + */ + movne r10, #0 @ terminator + movne r4, #2 @ Size of this entry (2 words) + stmiane r9, {r4, r5, r10} @ Size, ATAG_CORE, terminator + +/* + * find the end of the tag list, and then add an INITRD tag on the end. + * If there is already an INITRD tag, then we ignore it; the last INITRD + * tag takes precedence. + */ +taglist: ldr r10, [r9, #0] @ tag length + teq r10, #0 @ last tag (zero length)? + addne r9, r9, r10, lsl #2 + bne taglist + + mov r5, #4 @ Size of initrd tag (4 words) + stmia r9, {r5, r6, r7, r8, r10} + b kernel_start @ call kernel + +/* + * Move the block of memory length r6 from address r4 to address r5 + */ +move: ldmia r4!, {r7 - r10} @ move 32-bytes at a time + stmia r5!, {r7 - r10} + ldmia r4!, {r7 - r10} + stmia r5!, {r7 - r10} + subs r6, r6, #8 * 4 + bcs move + mov pc, lr + + .size _start, . - _start + + .align + + .type data,#object +data: .word initrd_start @ source initrd address + .word initrd_phys @ destination initrd address + .word initrd_size @ initrd size + + .word 0x54410001 @ r5 = ATAG_CORE + .word 0x54420005 @ r6 = ATAG_INITRD2 + .word initrd_phys @ r7 + .word initrd_size @ r8 + .word params_phys @ r9 + .size data, . - data diff --git a/arch/arm/boot/bootp/initrd.S b/arch/arm/boot/bootp/initrd.S new file mode 100644 index 000000000..dd3d04971 --- /dev/null +++ b/arch/arm/boot/bootp/initrd.S @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + .type initrd_start,#object + .globl initrd_start +initrd_start: + .incbin INITRD + .globl initrd_end +initrd_end: diff --git a/arch/arm/boot/bootp/kernel.S b/arch/arm/boot/bootp/kernel.S new file mode 100644 index 000000000..dc6236c17 --- /dev/null +++ b/arch/arm/boot/bootp/kernel.S @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + .globl kernel_start +kernel_start: + .incbin "arch/arm/boot/zImage" + .globl kernel_end +kernel_end: + .align 2 |