projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| df2078b8 YS |
2 | #include <linux/init.h> |
| 3 | #include <asm/thread_info.h> | |
| 4 | ||
| 5 | #if defined(CONFIG_CPU_H8300H) | |
| 6 | .h8300h | |
| 7 | #define SYSCR 0xfee012 | |
| 8 | #define IRAMTOP 0xffff20 | |
| 9 | #define NR_INT 64 | |
| 10 | #endif | |
| 11 | #if defined(CONFIG_CPU_H8S) | |
| 12 | .h8300s | |
| 13 | #define INTCR 0xffff31 | |
| 14 | #define IRAMTOP 0xffc000 | |
| 15 | #define NR_INT 128 | |
| 16 | #endif | |
| 17 | ||
| 18 | __HEAD | |
| 19 | .global _start | |
| 20 | _start: | |
| 21 | mov.l #IRAMTOP,sp | |
| 22 | #if !defined(CONFIG_H8300H_SIM) && \ | |
| 23 | !defined(CONFIG_H8S_SIM) | |
| 24 | jsr @lowlevel_init | |
| 25 | ||
| 26 | /* copy .data */ | |
| 27 | mov.l #_begin_data,er5 | |
| 28 | mov.l #_sdata,er6 | |
| 29 | mov.l #_edata,er4 | |
| 30 | sub.l er6,er4 | |
| 31 | shlr.l er4 | |
| 32 | shlr.l er4 | |
| 33 | 1: | |
| 34 | mov.l @er5+,er0 | |
| 35 | mov.l er0,@er6 | |
| 36 | adds #4,er6 | |
| 37 | dec.l #1,er4 | |
| 38 | bne 1b | |
| 39 | /* .bss clear */ | |
| 40 | mov.l #_sbss,er5 | |
| 41 | mov.l #_ebss,er4 | |
| 42 | sub.l er5,er4 | |
| 43 | shlr er4 | |
| 44 | shlr er4 | |
| 45 | sub.l er0,er0 | |
| 46 | 1: | |
| 47 | mov.l er0,@er5 | |
| 48 | adds #4,er5 | |
| 49 | dec.l #1,er4 | |
| 50 | bne 1b | |
| 51 | #else | |
| 52 | /* get cmdline from gdb */ | |
| 53 | jsr @0xcc | |
| 54 | ;; er0 - argc | |
| 55 | ;; er1 - argv | |
| 56 | mov.l #command_line,er3 | |
| 57 | adds #4,er1 | |
| 58 | dec.l #1,er0 | |
| 59 | beq 4f | |
| 60 | 1: | |
| 61 | mov.l @er1+,er2 | |
| 62 | 2: | |
| 63 | mov.b @er2+,r4l | |
| 64 | beq 3f | |
| 65 | mov.b r4l,@er3 | |
| 66 | adds #1,er3 | |
| 67 | bra 2b | |
| 68 | 3: | |
| 69 | mov.b #' ',r4l | |
| 70 | mov.b r4l,@er3 | |
| 71 | adds #1,er3 | |
| 72 | dec.l #1,er0 | |
| 73 | bne 1b | |
| 74 | subs #1,er3 | |
| 75 | mov.b #0,r4l | |
| 76 | mov.b r4l,@er3 | |
| 77 | 4: | |
| 78 | #endif | |
| 79 | sub.l er0,er0 | |
| 80 | jsr @h8300_fdt_init | |
| 81 | /* linux kernel start */ | |
| 82 | #if defined(CONFIG_CPU_H8300H) | |
| 83 | ldc #0xd0,ccr /* running kernel */ | |
| 84 | mov.l #SYSCR,er0 | |
| 85 | bclr #3,@er0 | |
| 86 | #endif | |
| 87 | #if defined(CONFIG_CPU_H8S) | |
| 88 | ldc #0x07,exr | |
| 89 | bclr #4,@INTCR:8 | |
| 90 | bset #5,@INTCR:8 /* Interrupt mode 2 */ | |
| 91 | ldc #0x90,ccr /* running kernel */ | |
| 92 | #endif | |
| 93 | mov.l #init_thread_union,sp | |
| 94 | add.l #0x2000,sp | |
| 95 | jsr @start_kernel | |
| 96 | ||
| 97 | 1: | |
| 98 | bra 1b | |
| 99 | ||
| 100 | #if defined(CONFIG_ROMKERNEL) | |
| 101 | /* interrupt vector */ | |
| 102 | .section .vectors,"ax" | |
| 103 | .long _start | |
| 104 | .long _start | |
| 105 | vector = 2 | |
| 106 | .rept NR_INT - 2 | |
| 107 | .long _interrupt_redirect_table+vector*4 | |
| 108 | vector = vector + 1 | |
| 109 | .endr | |
| 110 | #endif | |
| 111 | .end |