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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/xtensa/boot/boot-redboot
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/xtensa/boot/boot-redboot')
-rw-r--r--arch/xtensa/boot/boot-redboot/Makefile31
-rw-r--r--arch/xtensa/boot/boot-redboot/boot.ld59
-rw-r--r--arch/xtensa/boot/boot-redboot/bootstrap.S255
3 files changed, 345 insertions, 0 deletions
diff --git a/arch/xtensa/boot/boot-redboot/Makefile b/arch/xtensa/boot/boot-redboot/Makefile
new file mode 100644
index 0000000000..c0eef3f6f3
--- /dev/null
+++ b/arch/xtensa/boot/boot-redboot/Makefile
@@ -0,0 +1,31 @@
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License. See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+
+OBJCOPY_ARGS := -O $(if $(CONFIG_CPU_BIG_ENDIAN),elf32-xtensa-be,elf32-xtensa-le)
+
+boot-y := bootstrap.o
+targets += $(boot-y)
+
+OBJS := $(addprefix $(obj)/,$(boot-y))
+LIBS := arch/xtensa/boot/lib/lib.a arch/xtensa/lib/lib.a
+
+$(obj)/zImage.o: $(obj)/../vmlinux.bin.gz $(OBJS)
+ $(Q)$(OBJCOPY) $(OBJCOPY_ARGS) -R .comment \
+ --add-section image=$< \
+ --set-section-flags image=contents,alloc,load,load,data \
+ $(OBJS) $@
+
+$(obj)/zImage.elf: $(obj)/zImage.o $(LIBS)
+ $(Q)$(LD) $(KBUILD_LDFLAGS) \
+ -T $(srctree)/$(obj)/boot.ld \
+ --build-id=none \
+ -o $@ $^
+
+$(obj)/../zImage.redboot: $(obj)/zImage.elf
+ $(Q)$(OBJCOPY) -S -O binary $< $@
+ $(Q)$(kecho) ' Kernel: $@ is ready'
+
+all zImage: $(obj)/../zImage.redboot
diff --git a/arch/xtensa/boot/boot-redboot/boot.ld b/arch/xtensa/boot/boot-redboot/boot.ld
new file mode 100644
index 0000000000..b0b9e95b58
--- /dev/null
+++ b/arch/xtensa/boot/boot-redboot/boot.ld
@@ -0,0 +1,59 @@
+OUTPUT_ARCH(xtensa)
+
+SECTIONS
+{
+ .start 0xD1000000 : { *(.start) }
+
+ .text :
+ {
+ __reloc_start = . ;
+ _text_start = . ;
+ *(.literal .text.literal .text)
+ _text_end = . ;
+ }
+
+ .rodata ALIGN(0x04):
+ {
+ *(.rodata)
+ *(.rodata1)
+ }
+
+ .data ALIGN(0x04):
+ {
+ *(.data)
+ *(.data1)
+ *(.sdata)
+ *(.sdata2)
+ *(.got.plt)
+ *(.got)
+ *(.dynamic)
+ }
+
+ __reloc_end = . ;
+
+ . = ALIGN(0x10);
+ __image_load = . ;
+ .image 0xd0003000: AT(__image_load)
+ {
+ _image_start = .;
+ *(image)
+ . = (. + 3) & ~ 3;
+ _image_end = . ;
+ }
+
+
+ .bss ((LOADADDR(.image) + SIZEOF(.image) + 3) & ~ 3):
+ {
+ __bss_start = .;
+ *(.sbss)
+ *(.scommon)
+ *(.dynbss)
+ *(.bss)
+ __bss_end = .;
+ }
+ _end = .;
+ _param_start = .;
+
+
+ PROVIDE (end = .);
+}
diff --git a/arch/xtensa/boot/boot-redboot/bootstrap.S b/arch/xtensa/boot/boot-redboot/bootstrap.S
new file mode 100644
index 0000000000..3ed94ad350
--- /dev/null
+++ b/arch/xtensa/boot/boot-redboot/bootstrap.S
@@ -0,0 +1,255 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <asm/core.h>
+#include <asm/regs.h>
+#include <asm/asmmacro.h>
+#include <asm/cacheasm.h>
+#include <asm/processor.h>
+ /*
+ * RB-Data: RedBoot data/bss
+ * P: Boot-Parameters
+ * L: Kernel-Loader
+ *
+ * The Linux-Kernel image including the loader must be loaded
+ * to a position so that the kernel and the boot parameters
+ * can fit in the space before the load address.
+ * ______________________________________________________
+ * |_RB-Data_|_P_|__________|_L_|___Linux-Kernel___|______|
+ * ^
+ * ^ Load address
+ * ______________________________________________________
+ * |___Linux-Kernel___|_P_|_L_|___________________________|
+ *
+ * The loader copies the parameter to the position that will
+ * be the end of the kernel and itself to the end of the
+ * parameter list.
+ */
+
+/* Make sure we have enough space for the 'uncompressor' */
+
+#define STACK_SIZE 32768
+#define HEAP_SIZE (131072*4)
+
+ # a2: Parameter list
+ # a3: Size of parameter list
+
+ .section .start, "ax"
+
+ .globl __start
+ /* this must be the first byte of the loader! */
+__start:
+ abi_entry(32) # we do not intend to return
+ _call0 _start
+__start_a0:
+ .align 4
+
+ .section .text, "ax"
+ .literal_position
+ .begin literal_prefix .text
+
+ /* put literals in here! */
+
+ .globl _start
+_start:
+
+ /* 'reset' window registers */
+
+ movi a4, 1
+ wsr a4, ps
+ rsync
+#if XCHAL_HAVE_WINDOWED
+ rsr a5, windowbase
+ ssl a5
+ sll a4, a4
+ wsr a4, windowstart
+ rsync
+#endif
+ movi a4, KERNEL_PS_WOE_MASK
+ wsr a4, ps
+ rsync
+
+KABI_C0 mov abi_saved0, abi_arg0
+
+ /* copy the loader to its address
+ * Note: The loader itself is a very small piece, so we assume we
+ * don't partially overlap. We also assume (even more important)
+ * that the kernel image is out of the way. Usually, when the
+ * load address of this image is not at an arbitrary address,
+ * but aligned to some 10K's we shouldn't overlap.
+ */
+
+ /* Note: The assembler cannot relax "addi a0, a0, ..." to an
+ l32r, so we load to a4 first. */
+
+ # addi a4, a0, __start - __start_a0
+ # mov a0, a4
+
+ movi a4, __start
+ movi a5, __start_a0
+ add a4, a0, a4
+ sub a0, a4, a5
+
+ movi a4, __start
+ movi a5, __reloc_end
+
+ # a0: address where this code has been loaded
+ # a4: compiled address of __start
+ # a5: compiled end address
+
+ mov.n a7, a0
+ mov.n a8, a4
+
+1:
+ l32i a10, a7, 0
+ l32i a11, a7, 4
+ s32i a10, a8, 0
+ s32i a11, a8, 4
+ l32i a10, a7, 8
+ l32i a11, a7, 12
+ s32i a10, a8, 8
+ s32i a11, a8, 12
+ addi a8, a8, 16
+ addi a7, a7, 16
+ blt a8, a5, 1b
+
+
+ /* We have to flush and invalidate the caches here before we jump. */
+
+#if XCHAL_DCACHE_IS_WRITEBACK
+
+ ___flush_dcache_all a5 a6
+
+#endif
+
+ ___invalidate_icache_all a5 a6
+ isync
+
+ movi a11, _reloc
+ jx a11
+
+ .globl _reloc
+_reloc:
+
+ /* RedBoot is now at the end of the memory, so we don't have
+ * to copy the parameter list. Keep the code around; in case
+ * we need it again. */
+#if 0
+ # a0: load address
+ # a2: start address of parameter list
+ # a3: length of parameter list
+ # a4: __start
+
+ /* copy the parameter list out of the way */
+
+ movi a6, _param_start
+ add a3, a2, a3
+2:
+ l32i a8, a2, 0
+ s32i a8, a6, 0
+ addi a2, a2, 4
+ addi a6, a6, 4
+ blt a2, a3, 2b
+#endif
+
+ /* clear BSS section */
+ movi a6, __bss_start
+ movi a7, __bss_end
+ movi.n a5, 0
+3:
+ s32i a5, a6, 0
+ addi a6, a6, 4
+ blt a6, a7, 3b
+
+ movi a5, -16
+ movi a1, _stack + STACK_SIZE
+ and a1, a1, a5
+
+ /* Uncompress the kernel */
+
+ # a0: load address
+ # a2: boot parameter
+ # a4: __start
+
+ movi a3, __image_load
+ sub a4, a3, a4
+ add abi_arg2, a0, a4
+
+ # a1 Stack
+ # a8(a4) Load address of the image
+
+ movi abi_arg0, _image_start
+ movi abi_arg4, _image_end
+ movi abi_arg1, 0x1000000
+ sub abi_tmp0, abi_arg4, abi_arg0
+ movi abi_arg3, complen
+ s32i abi_tmp0, abi_arg3, 0
+
+ movi a0, 0
+
+ # abi_arg0 destination
+ # abi_arg1 maximum size of destination
+ # abi_arg2 source
+ # abi_arg3 ptr to length
+
+ .extern gunzip
+ movi abi_tmp0, gunzip
+ beqz abi_tmp0, 1f
+
+ abi_callx abi_tmp0
+
+ j 2f
+
+
+ # abi_arg0 destination start
+ # abi_arg1 maximum size of destination
+ # abi_arg2 source start
+ # abi_arg3 ptr to length
+ # abi_arg4 destination end
+
+1:
+ l32i abi_tmp0, abi_arg2, 0
+ l32i abi_tmp1, abi_arg2, 4
+ s32i abi_tmp0, abi_arg0, 0
+ s32i abi_tmp1, abi_arg0, 4
+ l32i abi_tmp0, abi_arg2, 8
+ l32i abi_tmp1, abi_arg2, 12
+ s32i abi_tmp0, abi_arg0, 8
+ s32i abi_tmp1, abi_arg0, 12
+ addi abi_arg0, abi_arg0, 16
+ addi abi_arg2, abi_arg2, 16
+ blt abi_arg0, abi_arg4, 1b
+
+
+ /* jump to the kernel */
+2:
+#if XCHAL_DCACHE_IS_WRITEBACK
+
+ ___flush_dcache_all a5 a6
+
+#endif
+
+ ___invalidate_icache_all a5 a6
+
+ isync
+
+ # a2 Boot parameter list
+
+KABI_C0 mov abi_arg0, abi_saved0
+ movi a0, _image_start
+ jx a0
+
+ .align 16
+ .data
+ .globl avail_ram
+avail_ram:
+ .long _heap
+ .globl end_avail
+end_avail:
+ .long _heap + HEAP_SIZE
+
+ .comm _stack, STACK_SIZE
+ .comm _heap, HEAP_SIZE
+
+ .globl end_avail
+ .comm complen, 4
+
+ .end literal_prefix