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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m32r/kernel/head.S
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/m32r/kernel/head.S')
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diff --git a/arch/m32r/kernel/head.S b/arch/m32r/kernel/head.S
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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