| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/h8300/platform/h8s/edosk2674/crt0_ram.S |
| 3 | * |
| 4 | * Yoshinori Sato <ysato@users.sourceforge.jp> |
| 5 | * |
| 6 | * Platform depend startup |
| 7 | * Target Archtecture: EDOSK-2674 |
| 8 | * Memory Layout : RAM |
| 9 | */ |
| 10 | |
| 11 | #define ASSEMBLY |
| 12 | |
| 13 | #include <linux/config.h> |
| 14 | #include <asm/linkage.h> |
| 15 | #include <asm/regs267x.h> |
| 16 | |
| 17 | #if !defined(CONFIG_BLKDEV_RESERVE) |
| 18 | #if defined(CONFIG_GDB_DEBUG) |
| 19 | #define RAMEND (__ramend - 0xc000) |
| 20 | #else |
| 21 | #define RAMEND __ramend |
| 22 | #endif |
| 23 | #else |
| 24 | #define RAMEND CONFIG_BLKDEV_RESERVE_ADDRESS |
| 25 | #endif |
| 26 | |
| 27 | .global SYMBOL_NAME(_start) |
| 28 | .global SYMBOL_NAME(_command_line) |
| 29 | .global SYMBOL_NAME(_platform_gpio_table) |
| 30 | .global SYMBOL_NAME(_target_name) |
| 31 | |
| 32 | .h8300s |
| 33 | |
| 34 | .section .text |
| 35 | .file "crt0_ram.S" |
| 36 | |
| 37 | /* CPU Reset entry */ |
| 38 | SYMBOL_NAME_LABEL(_start) |
| 39 | mov.l #RAMEND,sp |
| 40 | ldc #0x80,ccr |
| 41 | ldc #0x00,exr |
| 42 | |
| 43 | /* Peripheral Setup */ |
| 44 | bclr #4,@INTCR:8 /* interrupt mode 2 */ |
| 45 | bset #5,@INTCR:8 |
| 46 | bclr #0,@IER+1:16 |
| 47 | bset #1,@ISCRL+1:16 /* IRQ0 Positive Edge */ |
| 48 | bclr #0,@ISCRL+1:16 |
| 49 | |
| 50 | #if defined(CONFIG_MTD_UCLINUX) |
| 51 | /* move romfs image */ |
| 52 | jsr @__move_romfs |
| 53 | #endif |
| 54 | |
| 55 | /* .bss clear */ |
| 56 | mov.l #__sbss,er5 |
| 57 | mov.l er5,er6 |
| 58 | mov.l #__ebss,er4 |
| 59 | sub.l er5,er4 |
| 60 | shlr #2,er4 |
| 61 | sub.l er0,er0 |
| 62 | 1: |
| 63 | mov.l er0,@er5 |
| 64 | adds #4,er5 |
| 65 | dec.l #1,er4 |
| 66 | bne 1b |
| 67 | |
| 68 | /* copy kernel commandline */ |
| 69 | mov.l #COMMAND_START,er5 |
| 70 | mov.l #SYMBOL_NAME(command_line),er6 |
| 71 | mov.w #512,r4 |
| 72 | eepmov.w |
| 73 | |
| 74 | /* uClinux kernel start */ |
| 75 | ldc #0x90,ccr /* running kernel */ |
| 76 | mov.l #SYMBOL_NAME(init_thread_union),sp |
| 77 | add.l #0x2000,sp |
| 78 | jsr @_start_kernel |
| 79 | _exit: |
| 80 | |
| 81 | jmp _exit |
| 82 | |
| 83 | rts |
| 84 | |
| 85 | /* I/O port assign information */ |
| 86 | __platform_gpio_table: |
| 87 | mov.l #gpio_table,er0 |
| 88 | rts |
| 89 | |
| 90 | gpio_table: |
| 91 | ;; P1DDR |
| 92 | ;; used,ddr |
| 93 | .byte 0x00,0x00 |
| 94 | ;; P2DDR |
| 95 | .byte 0x00,0x00 |
| 96 | ;; P3DDR |
| 97 | .byte 0x3f,0x3a |
| 98 | ;; dummy |
| 99 | .byte 0x00,0x00 |
| 100 | ;; P5DDR |
| 101 | .byte 0x00,0x00 |
| 102 | ;; P6DDR |
| 103 | .byte 0x00,0x00 |
| 104 | ;; P7DDR |
| 105 | .byte 0x00,0x00 |
| 106 | ;; P8DDR |
| 107 | .byte 0x00,0x00 |
| 108 | ;; dummy |
| 109 | .byte 0x00,0x00 |
| 110 | ;; PADDR |
| 111 | .byte 0xff,0xff |
| 112 | ;; PBDDR |
| 113 | .byte 0xff,0x00 |
| 114 | ;; PCDDR |
| 115 | .byte 0xff,0x00 |
| 116 | ;; PDDDR |
| 117 | .byte 0xff,0x00 |
| 118 | ;; PEDDR |
| 119 | .byte 0xff,0x00 |
| 120 | ;; PFDDR |
| 121 | .byte 0xff,0xff |
| 122 | ;; PGDDR |
| 123 | .byte 0x0f,0x0f |
| 124 | ;; PHDDR |
| 125 | .byte 0x0f,0x0f |
| 126 | |
| 127 | __target_name: |
| 128 | .asciz "EDOSK-2674" |
| 129 | |
| 130 | .section .bootvec,"ax" |
| 131 | jmp @SYMBOL_NAME(_start) |
