62 lines
1 KiB
ArmAsm
62 lines
1 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/sys.h>
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#include <linux/init.h>
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#include <asm/unistd.h>
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#include <asm/setup.h>
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#include <asm/segment.h>
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#include <asm/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/errno.h>
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#if defined(CONFIG_CPU_H8300H)
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.h8300h
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#define SYSCR 0xfee012
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#define IRAMTOP 0xffff20
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#endif
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#if defined(CONFIG_CPU_H8S)
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.h8300s
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#define INTCR 0xffff31
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#define IRAMTOP 0xffc000
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#endif
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__HEAD
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.global _start
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_start:
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mov.l #IRAMTOP,sp
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/* .bss clear */
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mov.l #_sbss,er5
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mov.l #_ebss,er4
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sub.l er5,er4
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shlr er4
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shlr er4
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sub.l er2,er2
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1:
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mov.l er2,@er5
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adds #4,er5
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dec.l #1,er4
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bne 1b
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jsr @h8300_fdt_init
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/* linux kernel start */
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#if defined(CONFIG_CPU_H8300H)
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ldc #0xd0,ccr /* running kernel */
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mov.l #SYSCR,er0
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bclr #3,@er0
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#endif
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#if defined(CONFIG_CPU_H8S)
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ldc #0x07,exr
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bclr #4,@INTCR:8
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bset #5,@INTCR:8 /* Interrupt mode 2 */
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ldc #0x90,ccr /* running kernel */
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#endif
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mov.l #init_thread_union,sp
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add.l #0x2000,sp
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jsr @start_kernel
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1:
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bra 1b
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.end
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