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linux-pinenote/arch/m32r/kernel/head.S
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

287 lines
5.8 KiB
ArmAsm
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/*
* linux/arch/m32r/kernel/head.S
*
* M32R startup code.
*
* Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
* Hitoshi Yamamoto
*/
/* $Id$ */
#include <linux/init.h>
__INIT
__INITDATA
.text
#include <linux/config.h>
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/assembler.h>
#include <asm/m32r.h>
#include <asm/mmu_context.h>
/*
* References to members of the boot_cpu_data structure.
*/
.text
.global start_kernel
.global __bss_start
.global _end
ENTRY(stext)
ENTRY(_stext)
ENTRY(startup_32)
/* Setup up the stack pointer */
LDIMM (r0, spi_stack_top)
LDIMM (r1, spu_stack_top)
mvtc r0, spi
mvtc r1, spu
/* Initilalize PSW */
ldi r0, #0x0000 /* use SPI, disable EI */
mvtc r0, psw
/* Set up the stack pointer */
LDIMM (r0, stack_start)
ld r0, @r0
mvtc r0, spi
/*
* Clear BSS first so that there are no surprises...
*/
#ifdef CONFIG_ISA_DUAL_ISSUE
LDIMM (r2, __bss_start)
LDIMM (r3, _end)
sub r3, r2 ; BSS size in bytes
; 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 */
LDIMM (r2, __bss_start)
LDIMM (r3, _end)
sub r3, r2 ; BSS size in bytes
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:
and3 r4, r3, #3 ; get no. of remaining BSS bytes to clear
addi r2, #4 ; account for pre-inc store
beqz r4, .Lendloop2 ; any more to go?
.Lloop2:
stb r1, @r2 ; yep, zero out another byte
addi r2, #1 ; bump address
addi r4, #-1 ; decrement count
bnez r4, .Lloop2 ; go do some more
.Lendloop2:
#endif /* not CONFIG_ISA_DUAL_ISSUE */
#if 0 /* M32R_FIXME */
/*
* Copy data segment from ROM to RAM.
*/
.global ROM_D, TOP_DATA, END_DATA
LDIMM (r1, ROM_D)
LDIMM (r2, TOP_DATA)
LDIMM (r3, END_DATA)
addi r2, #-4
addi r3, #-4
loop1:
ld r0, @r1+
st r0, @+r2
cmp r2, r3
bc loop1
#endif /* 0 */
/* Jump to kernel */
LDIMM (r2, start_kernel)
jl r2
.fillinsn
1:
bra 1b ; main should never return here, but
; just in case, we know what happens.
#ifdef CONFIG_SMP
/*
* AP startup routine
*/
.text
.global eit_vector
ENTRY(startup_AP)
;; setup EVB
LDIMM (r4, eit_vector)
mvtc r4, cr5
;; enable MMU
LDIMM (r2, init_tlb)
jl r2
seth r4, #high(MATM)
or3 r4, r4, #low(MATM)
ldi r5, #0x01
st r5, @r4 ; Set MATM Reg(T bit ON)
ld r6, @r4 ; MATM Check
LDIMM (r5, 1f)
jmp r5 ; enable MMU
nop
.fillinsn
1:
;; ISN check
ld r6, @r4 ; MATM Check
seth r4, #high(M32R_ICU_ISTS_ADDR)
or3 r4, r4, #low(M32R_ICU_ISTS_ADDR)
ld r5, @r4 ; Read ISTSi reg.
mv r6, r5
slli r5, #13 ; PIML check
srli r5, #13 ;
seth r4, #high(M32R_ICU_IMASK_ADDR)
or3 r4, r4, #low(M32R_ICU_IMASK_ADDR)
st r5, @r4 ; Write IMASKi reg.
slli r6, #4 ; ISN check
srli r6, #26 ;
seth r4, #high(M32R_IRQ_IPI5)
or3 r4, r4, #low(M32R_IRQ_IPI5)
bne r4, r6, 2f ; if (ISN != CPU_BOOT_IPI) goto sleep;
;; check cpu_bootout_map and set cpu_bootin_map
LDIMM (r4, cpu_bootout_map)
ld r4, @r4
seth r5, #high(M32R_CPUID_PORTL)
or3 r5, r5, #low(M32R_CPUID_PORTL)
ld r5, @r5
ldi r6, #1
sll r6, r5
and r4, r6
beqz r4, 2f
LDIMM (r4, cpu_bootin_map)
ld r5, @r4
or r5, r6
st r6, @r4
;; clear PSW
ldi r4, #0
mvtc r4, psw
;; setup SPI
LDIMM (r4, stack_start)
ld r4, @r4
mvtc r4, spi
;; setup BPC (start_secondary)
LDIMM (r4, start_secondary)
mvtc r4, bpc
rte ; goto startup_secondary
nop
nop
.fillinsn
2:
;; disable MMU
seth r4, #high(MATM)
or3 r4, r4, #low(MATM)
ldi r5, #0
st r5, @r4 ; Set MATM Reg(T bit OFF)
ld r6, @r4 ; MATM Check
LDIMM (r4, 3f)
seth r5, #high(__PAGE_OFFSET)
or3 r5, r5, #low(__PAGE_OFFSET)
not r5, r5
and r4, r5
jmp r4 ; disable MMU
nop
.fillinsn
3:
;; SLEEP and wait IPI
LDIMM (r4, AP_loop)
seth r5, #high(__PAGE_OFFSET)
or3 r5, r5, #low(__PAGE_OFFSET)
not r5, r5
and r4, r5
jmp r4
nop
nop
#endif /* CONFIG_SMP */
ENTRY(stack_start)
.long init_thread_union+8192
.long __KERNEL_DS
/*
* This is initialized to create a identity-mapping at 0-4M (for bootup
* purposes) and another mapping of the 0-4M area at virtual address
* PAGE_OFFSET.
*/
.text
#define MOUNT_ROOT_RDONLY 1
#define RAMDISK_FLAGS 0 ; 1024KB
#define ORIG_ROOT_DEV 0x0100 ; /dev/ram0 (major:01, minor:00)
#define LOADER_TYPE 1 ; (??? - non-zero value seems
; to be needed to boot from initrd)
#define COMMAND_LINE ""
.section .empty_zero_page, "aw"
ENTRY(empty_zero_page)
.long MOUNT_ROOT_RDONLY /* offset: +0x00 */
.long RAMDISK_FLAGS
.long ORIG_ROOT_DEV
.long LOADER_TYPE
.long 0 /* INITRD_START */ /* +0x10 */
.long 0 /* INITRD_SIZE */
.long 0 /* CPU_CLOCK */
.long 0 /* BUS_CLOCK */
.long 0 /* TIMER_DIVIDE */ /* +0x20 */
.balign 256,0
.asciz COMMAND_LINE
.byte 0
.balign 4096,0,4096
/*------------------------------------------------------------------------
* Stack area
*/
.section .spi
ALIGN
.global spi_stack_top
.zero 1024
spi_stack_top:
.section .spu
ALIGN
.global spu_stack_top
.zero 1024
spu_stack_top:
.end
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