mirror of https://gitee.com/openkylin/linux.git
131 lines
2.1 KiB
ArmAsm
131 lines
2.1 KiB
ArmAsm
/*
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* linux/arch/h8300/platform/h8s/edosk2674/crt0_ram.S
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*
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* Yoshinori Sato <ysato@users.sourceforge.jp>
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*
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* Platform depend startup
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* Target Archtecture: EDOSK-2674
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* Memory Layout : RAM
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*/
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#define ASSEMBLY
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#include <asm/linkage.h>
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#include <asm/regs267x.h>
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#if !defined(CONFIG_BLKDEV_RESERVE)
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#if defined(CONFIG_GDB_DEBUG)
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#define RAMEND (__ramend - 0xc000)
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#else
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#define RAMEND __ramend
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#endif
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#else
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#define RAMEND CONFIG_BLKDEV_RESERVE_ADDRESS
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#endif
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.global SYMBOL_NAME(_start)
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.global SYMBOL_NAME(_command_line)
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.global SYMBOL_NAME(_platform_gpio_table)
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.global SYMBOL_NAME(_target_name)
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.h8300s
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.section .text
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.file "crt0_ram.S"
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/* CPU Reset entry */
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SYMBOL_NAME_LABEL(_start)
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mov.l #RAMEND,sp
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ldc #0x80,ccr
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ldc #0x00,exr
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/* Peripheral Setup */
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bclr #4,@INTCR:8 /* interrupt mode 2 */
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bset #5,@INTCR:8
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bclr #0,@IER+1:16
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bset #1,@ISCRL+1:16 /* IRQ0 Positive Edge */
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bclr #0,@ISCRL+1:16
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#if defined(CONFIG_MTD_UCLINUX)
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/* move romfs image */
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jsr @__move_romfs
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#endif
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/* .bss clear */
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mov.l #__sbss,er5
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mov.l er5,er6
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mov.l #__ebss,er4
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sub.l er5,er4
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shlr #2,er4
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sub.l er0,er0
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1:
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mov.l er0,@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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/* copy kernel commandline */
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mov.l #COMMAND_START,er5
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mov.l #SYMBOL_NAME(command_line),er6
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mov.w #512,r4
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eepmov.w
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/* uClinux kernel start */
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ldc #0x90,ccr /* running kernel */
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mov.l #SYMBOL_NAME(init_thread_union),sp
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add.l #0x2000,sp
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jsr @_start_kernel
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_exit:
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jmp _exit
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rts
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/* I/O port assign information */
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__platform_gpio_table:
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mov.l #gpio_table,er0
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rts
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gpio_table:
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;; P1DDR
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;; used,ddr
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.byte 0x00,0x00
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;; P2DDR
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.byte 0x00,0x00
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;; P3DDR
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.byte 0x3f,0x3a
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;; dummy
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.byte 0x00,0x00
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;; P5DDR
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.byte 0x00,0x00
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;; P6DDR
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.byte 0x00,0x00
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;; P7DDR
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.byte 0x00,0x00
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;; P8DDR
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.byte 0x00,0x00
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;; dummy
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.byte 0x00,0x00
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;; PADDR
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.byte 0xff,0xff
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;; PBDDR
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.byte 0xff,0x00
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;; PCDDR
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.byte 0xff,0x00
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;; PDDDR
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.byte 0xff,0x00
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;; PEDDR
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.byte 0xff,0x00
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;; PFDDR
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.byte 0xff,0xff
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;; PGDDR
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.byte 0x0f,0x0f
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;; PHDDR
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.byte 0x0f,0x0f
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__target_name:
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.asciz "EDOSK-2674"
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.section .bootvec,"ax"
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jmp @SYMBOL_NAME(_start)
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