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-/*
- * Kernel relocation stub for MIPS devices
- *
- * Copyright (C) 2015 Felix Fietkau <nbd@openwrt.org>
- *
- * Based on:
- *
- * LZMA compressed kernel loader for Atheros AR7XXX/AR9XXX based boards
- *
- * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
- *
- * Some parts of this code was based on the OpenWrt specific lzma-loader
- * for the BCM47xx and ADM5120 based boards:
- * Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
- * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- */
-
-#include <asm/asm.h>
-#include <asm/regdef.h>
-#include "cp0regdef.h"
-#include "cacheops.h"
-
-#define KSEG0 0x80000000
-
- .macro ehb
- sll zero, 3
- .endm
-
- .macro reset
- li t0, 0xbe000034
- lw t1, 0(t0)
- ori t1, 1
- sw t1, 0(t0)
- .endm
-
- .text
-
-LEAF(startup)
- .set noreorder
- .set mips32
-
- .fill 0x10000
-
- mtc0 zero, CP0_WATCHLO # clear watch registers
- mtc0 zero, CP0_WATCHHI
- mtc0 zero, CP0_CAUSE # clear before writing status register
-
- mfc0 t0, CP0_STATUS
- li t1, 0x1000001f
- or t0, t1
- xori t0, 0x1f
- mtc0 t0, CP0_STATUS
- ehb
-
- mtc0 zero, CP0_COUNT
- mtc0 zero, CP0_COMPARE
- ehb
-
- la t0, __reloc_label # get linked address of label
- bal __reloc_label # branch and link to label to
- nop # get actual address
-__reloc_label:
- subu t0, ra, t0 # get reloc_delta
-
- /* Copy our code to the right place */
- la t1, _code_start # get linked address of _code_start
- la t2, _code_end # get linked address of _code_end
-
- addu t4, t2, t0 # calculate actual address of _code_end
- lw t5, 0(t4) # get extra data size
-
- add t2, t5
- add t2, 4
-
- add t0, t1 # calculate actual address of _code_start
-
-__reloc_copy:
- lw t3, 0(t0)
- sw t3, 0(t1)
- add t1, 4
- blt t1, t2, __reloc_copy
- add t0, 4
-
- /* flush cache */
- la t0, _code_start
- la t1, _code_end
-
- li t2, ~(CONFIG_CACHELINE_SIZE - 1)
- and t0, t2
- and t1, t2
- li t2, CONFIG_CACHELINE_SIZE
-
- b __flush_check
- nop
-
-__flush_line:
- cache Hit_Writeback_Inv_D, 0(t0)
- cache Hit_Invalidate_I, 0(t0)
- add t0, t2
-
-__flush_check:
- bne t0, t1, __flush_line
- nop
-
- sync
-
- la t0, __reloc_back
- j t0
- nop
-
-__reloc_back:
- la t0, _code_end
- add t0, 4
-
- addu t1, t0, t5
-
- li t2, KERNEL_ADDR
-
-__kernel_copy:
- lw t3, 0(t0)
- sw t3, 0(t2)
- add t0, 4
- blt t0, t1, __kernel_copy
- add t2, 4
-
- /* flush cache */
- li t0, KERNEL_ADDR
- addu t1, t0, t5
-
- add t1, CONFIG_CACHELINE_SIZE - 1
- li t2, ~(CONFIG_CACHELINE_SIZE - 1)
- and t0, t2
- and t1, t2
- li t2, CONFIG_CACHELINE_SIZE
-
- b __kernel_flush_check
- nop
-
-__kernel_flush_line:
- cache Hit_Writeback_Inv_D, 0(t0)
- cache Hit_Invalidate_I, 0(t0)
- add t0, t2
-
-__kernel_flush_check:
- bne t0, t1, __kernel_flush_line
- nop
-
- sync
-
- li t0, KERNEL_ADDR
- jr t0
- nop
-
- .set reorder
-END(startup)