+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * linux/arch/m32r/boot/compressed/head.S
- *
- * Copyright (c) 2001-2003 Hiroyuki Kondo, Hirokazu Takata,
- * Hitoshi Yamamoto, Takeo Takahashi
- * Copyright (c) 2004 Hirokazu Takata
- */
-
- .text
-#include <linux/linkage.h>
-#include <asm/addrspace.h>
-#include <asm/page.h>
-#include <asm/assembler.h>
-
- /*
- * This code can be loaded anywhere, as long as output will not
- * overlap it.
- *
- * NOTE: This head.S should *NOT* be compiled with -fpic.
- *
- */
-
- .global startup
- .global __bss_start, _ebss, end, zimage_data, zimage_len
- __ALIGN
-startup:
- ldi r0, #0x0000 /* SPI, disable EI */
- mvtc r0, psw
-
- ldi r12, #-8
- bl 1f
- .fillinsn
-1:
- seth r1, #high(CONFIG_MEMORY_START + 0x00400000) /* Start address */
- add r12, r14 /* Real address */
- sub r12, r1 /* difference */
-
- .global got_len
- seth r3, #high(_GLOBAL_OFFSET_TABLE_+8)
- or3 r3, r3, #low(_GLOBAL_OFFSET_TABLE_+12)
- add r3, r14
-
- /* Update the contents of global offset table */
- ldi r1, #low(got_len)
- srli r1, #2
- beqz r1, 2f
- .fillinsn
-1:
- ld r2, @r3
- add r2, r12
- st r2, @r3
- addi r3, #4
- addi r1, #-1
- bnez r1, 1b
- .fillinsn
-2:
- /* XXX: resolve plt */
-
-/*
- * Clear BSS first so that there are no surprises...
- */
-#ifdef CONFIG_ISA_DUAL_ISSUE
- seth r2, #high(__bss_start)
- or3 r2, r2, #low(__bss_start)
- add r2, r12
- seth r3, #high(_ebss)
- or3 r3, r3, #low(_ebss)
- add r3, r12
- sub r3, r2
-
- ; R4 = BSS size in longwords (rounded down)
- mv r4, r3 || ldi r1, #0
- srli r4, #4 || addi r2, #-4
- beqz r4, .Lendloop1
-.Lloop1:
-#ifndef CONFIG_CHIP_M32310
- ; Touch memory for the no-write-allocating cache.
- ld r0, @(4,r2)
-#endif
- st r1, @+r2 || addi r4, #-1
- st r1, @+r2
- st r1, @+r2
- st r1, @+r2 || cmpeq r1, r4 ; R4 = 0?
- bnc .Lloop1
-.Lendloop1:
- and3 r4, r3, #15
- addi r2, #4
- beqz r4, .Lendloop2
-.Lloop2:
- stb r1, @r2 || addi r4, #-1
- addi r2, #1
- bnez r4, .Lloop2
-.Lendloop2:
-
-#else /* not CONFIG_ISA_DUAL_ISSUE */
- seth r2, #high(__bss_start)
- or3 r2, r2, #low(__bss_start)
- add r2, r12
- seth r3, #high(_ebss)
- or3 r3, r3, #low(_ebss)
- add r3, r12
- sub r3, r2
- mv r4, r3
- srli r4, #2 ; R4 = BSS size in longwords (rounded down)
- ldi r1, #0 ; clear R1 for longwords store
- addi r2, #-4 ; account for pre-inc store
- beqz r4, .Lendloop1 ; any more to go?
-.Lloop1:
- st r1, @+r2 ; yep, zero out another longword
- addi r4, #-1 ; decrement count
- bnez r4, .Lloop1 ; go do some more
-.Lendloop1:
-
-#endif /* not CONFIG_ISA_DUAL_ISSUE */
-
- seth r1, #high(end)
- or3 r1, r1, #low(end)
- add r1, r12
- mv sp, r1
-
-/*
- * decompress the kernel
- */
- mv r0, sp
- srli r0, 31 /* MMU is ON or OFF */
- seth r1, #high(zimage_data)
- or3 r1, r1, #low(zimage_data)
- add r1, r12
- seth r2, #high(zimage_len)
- or3 r2, r2, #low(zimage_len)
- mv r3, sp
-
- bl decompress_kernel
-
-#if defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_VDEC2)
- /* Cache flush */
- ldi r0, -1
- ldi r1, 0xd0 ; invalidate i-cache, copy back d-cache
- stb r1, @r0
-#elif defined(CONFIG_CHIP_M32102)
- /* Cache flush */
- ldi r0, -2
- ldi r1, 0x0100 ; invalidate
- stb r1, @r0
-#elif defined(CONFIG_CHIP_M32104)
- /* Cache flush */
- ldi r0, -2
- ldi r1, 0x0700 ; invalidate i-cache, copy back d-cache
- sth r1, @r0
-#else
-#error "put your cache flush function, please"
-#endif
-
- mv r0, sp
- srli r0, 31 /* MMU is ON or OFF */
- slli r0, 31
- or3 r0, r0, #0x2000
- seth r1, #high(CONFIG_MEMORY_START)
- or r0, r1
- jmp r0
-
- .balign 512
-fake_headers_as_bzImage:
- .short 0
- .ascii "HdrS"
- .short 0x0202
- .short 0
- .short 0
- .byte 0x00, 0x10
- .short 0
- .byte 0
- .byte 1
- .byte 0x00, 0x80
- .long 0
- .long 0
-
git.samba.org / sfrench / cifs-2.6.git / blobdiff