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Diffstat (limited to 'arch/m32r/kernel/head.S')
| -rw-r--r-- | arch/m32r/kernel/head.S | 284 |
1 files changed, 0 insertions, 284 deletions
diff --git a/arch/m32r/kernel/head.S b/arch/m32r/kernel/head.S deleted file mode 100644 index 1f040973df1c..000000000000 --- a/arch/m32r/kernel/head.S +++ /dev/null @@ -1,284 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * linux/arch/m32r/kernel/head.S - * - * M32R startup code. - * - * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata, - * Hitoshi Yamamoto - */ - -#include <linux/init.h> -__INIT -__INITDATA - - .text -#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. - */ -__HEAD - .global start_kernel - .global __bss_start - .global _end -ENTRY(stext) -ENTRY(_stext) - /* 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 - */ - .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 */ - - .text -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 .init.data, "aw" - ALIGN - .global spi_stack_top - .zero 1024 -spi_stack_top: - - .section .init.data, "aw" - ALIGN - .global spu_stack_top - .zero 1024 -spu_stack_top: - - .end |