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-rw-r--r--arch/xtensa/boot/boot-redboot/bootstrap.S255
1 files changed, 255 insertions, 0 deletions
diff --git a/arch/xtensa/boot/boot-redboot/bootstrap.S b/arch/xtensa/boot/boot-redboot/bootstrap.S
new file mode 100644
index 000000000..3ed94ad35
--- /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