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| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * linux/arch/sh/boot/compressed/head.S
| *
| * Copyright (C) 1999 Stuart Menefy
| * Copyright (C) 2003 SUGIOKA Toshinobu
| */
|
| .text
|
| #include <asm/page.h>
|
| .global startup
| startup:
| /* Load initial status register */
| mov.l init_sr, r1
| ldc r1, sr
|
| /* Move myself to proper location if necessary */
| mova 1f, r0
| mov.l 1f, r2
| cmp/eq r2, r0
| bt clear_bss
| sub r0, r2
| mov.l bss_start_addr, r0
| mov #0xffffffe0, r1
| and r1, r0 ! align cache line
| mov.l text_start_addr, r3
| mov r0, r1
| sub r2, r1
| 3:
| mov.l @r1, r4
| mov.l @(4,r1), r5
| mov.l @(8,r1), r6
| mov.l @(12,r1), r7
| mov.l @(16,r1), r8
| mov.l @(20,r1), r9
| mov.l @(24,r1), r10
| mov.l @(28,r1), r11
| mov.l r4, @r0
| mov.l r5, @(4,r0)
| mov.l r6, @(8,r0)
| mov.l r7, @(12,r0)
| mov.l r8, @(16,r0)
| mov.l r9, @(20,r0)
| mov.l r10, @(24,r0)
| mov.l r11, @(28,r0)
| #ifdef CONFIG_CPU_SH4
| ocbwb @r0
| #endif
| cmp/hi r3, r0
| add #-32, r0
| bt/s 3b
| add #-32, r1
| mov.l 2f, r0
| jmp @r0
| nop
|
| .align 2
| 1: .long 1b
| 2: .long clear_bss
| text_start_addr:
| .long startup
|
| /* Clear BSS */
| clear_bss:
| mov.l end_addr, r1
| mov.l bss_start_addr, r2
| mov #0, r0
| l1:
| mov.l r0, @-r1
| cmp/eq r1,r2
| bf l1
|
| /* Set the initial pointer. */
| mov.l init_stack_addr, r0
| mov.l @r0, r15
|
| /* Decompress the kernel */
| mov.l decompress_kernel_addr, r0
| jsr @r0
| nop
|
| /* Jump to the start of the decompressed kernel */
| mov.l kernel_start_addr, r0
| jmp @r0
| nop
|
| .align 2
| bss_start_addr:
| .long __bss_start
| end_addr:
| .long _end
| init_sr:
| .long 0x500000F0 /* Privileged mode, Bank=0, Block=1, IMASK=0xF */
| kexec_magic:
| .long 0x400000F0 /* magic used by kexec to parse zImage format */
| init_stack_addr:
| .long stack_start
| decompress_kernel_addr:
| .long decompress_kernel
| kernel_start_addr:
| #ifdef CONFIG_32BIT
| .long ___pa(_text+PAGE_SIZE)
| #else
| .long _text+PAGE_SIZE
| #endif
|
| .align 9
| fake_headers_as_bzImage:
| .word 0
| .ascii "HdrS" ! header signature
| .word 0x0202 ! header version number (>= 0x0105)
| ! or else old loadlin-1.5 will fail)
| .word 0 ! default_switch
| .word 0 ! SETUPSEG
| .word 0x1000
| .word 0 ! pointing to kernel version string
| .byte 0 ! = 0, old one (LILO, Loadlin,
| ! 0xTV: T=0 for LILO
| ! V = version
| .byte 1 ! Load flags bzImage=1
| .word 0x8000 ! size to move, when setup is not
| .long 0x100000 ! 0x100000 = default for big kernel
| .long 0 ! address of loaded ramdisk image
| .long 0 # its size in bytes
|
|
