path: root/arch/sparc/kernel/head_64.S

/* head.S: Initial boot code for the Sparc64 port of Linux.
 *
 * Copyright (C) 1996, 1997, 2007 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au)
 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
 */

#include <linux/version.h>
#include <linux/errno.h>
#include <linux/threads.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/thread_info.h>
#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/spitfire.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/errno.h>
#include <asm/signal.h>
#include <asm/processor.h>
#include <asm/lsu.h>
#include <asm/dcr.h>
#include <asm/dcu.h>
#include <asm/head.h>
#include <asm/ttable.h>
#include <asm/mmu.h>
#include <asm/cpudata.h>
#include <asm/pil.h>
#include <asm/estate.h>
#include <asm/sfafsr.h>
#include <asm/unistd.h>
	
/* This section from from _start to sparc64_boot_end should fit into
 * 0x0000000000404000 to 0x0000000000408000.
 */
	.text
	.globl	start, _start, stext, _stext
_start:
start:
_stext:
stext:
! 0x0000000000404000
	b	sparc64_boot
	 flushw					/* Flush register file.      */

/* This stuff has to be in sync with SILO and other potential boot loaders
 * Fields should be kept upward compatible and whenever any change is made,
 * HdrS version should be incremented.
 */
        .global root_flags, ram_flags, root_dev
        .global sparc_ramdisk_image, sparc_ramdisk_size
	.global sparc_ramdisk_image64

        .ascii  "HdrS"
        .word   LINUX_VERSION_CODE

	/* History:
	 *
	 * 0x0300 : Supports being located at other than 0x4000
	 * 0x0202 : Supports kernel params string
	 * 0x0201 : Supports reboot_command
	 */
	.half   0x0301          /* HdrS version */

root_flags:
        .half   1
root_dev:
        .half   0
ram_flags:
        .half   0
sparc_ramdisk_image:
        .word   0
sparc_ramdisk_size:
        .word   0
        .xword  reboot_command
	.xword	bootstr_info
sparc_ramdisk_image64:
	.xword	0
	.word	_end

	/* PROM cif handler code address is in %o4.  */
sparc64_boot:
	mov	%o4, %l7

	/* We need to remap the kernel.  Use position independant
	 * code to remap us to KERNBASE.
	 *
	 * SILO can invoke us with 32-bit address masking enabled,
	 * so make sure that's clear.
	 */
	rdpr	%pstate, %g1
	andn	%g1, PSTATE_AM, %g1
	wrpr	%g1, 0x0, %pstate
	ba,a,pt	%xcc, 1f

	.globl	prom_finddev_name, prom_chosen_path, prom_root_node
	.globl	prom_getprop_name, prom_mmu_name, prom_peer_name
	.globl	prom_callmethod_name, prom_translate_name, prom_root_compatible
	.globl	prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
	.globl	prom_boot_mapped_pc, prom_boot_mapping_mode
	.globl	prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
	.globl	prom_compatible_name, prom_cpu_path, prom_cpu_compatible
	.globl	is_sun4v, sun4v_chip_type, prom_set_trap_table_name
prom_peer_name:
	.asciz	"peer"
prom_compatible_name:
	.asciz	"compatible"
prom_finddev_name:
	.asciz	"finddevice"
prom_chosen_path:
	.asciz	"/chosen"
prom_cpu_path:
	.asciz	"/cpu"
prom_getprop_name:
	.asciz	"getprop"
prom_mmu_name:
	.asciz	"mmu"
prom_callmethod_name:
	.asciz	"call-method"
prom_translate_name:
	.asciz	"translate"
prom_map_name:
	.asciz	"map"
prom_unmap_name:
	.asciz	"unmap"
prom_set_trap_table_name:
	.asciz	"SUNW,set-trap-table"
prom_sun4v_name:
	.asciz	"sun4v"
prom_niagara_prefix:
	.asciz	"SUNW,UltraSPARC-T"
	.align	4
prom_root_compatible:
	.skip	64
prom_cpu_compatible:
	.skip	64
prom_root_node:
	.word	0
prom_mmu_ihandle_cache:
	.word	0
prom_boot_mapped_pc:
	.word	0
prom_boot_mapping_mode:
	.word	0
	.align	8
prom_boot_mapping_phys_high:
	.xword	0
prom_boot_mapping_phys_low:
	.xword	0
is_sun4v:
	.word	0
sun4v_chip_type:
	.word	SUN4V_CHIP_INVALID
1:
	rd	%pc, %l0

	mov	(1b - prom_peer_name), %l1
	sub	%l0, %l1, %l1
	mov	0, %l2

	/* prom_root_node = prom_peer(0) */
	stx	%l1, [%sp + 2047 + 128 + 0x00]	! service, "peer"
	mov	1, %l3
	stx	%l3, [%sp + 2047 + 128 + 0x08]	! num_args, 1
	stx	%l3, [%sp + 2047 + 128 + 0x10]	! num_rets, 1
	stx	%l2, [%sp + 2047 + 128 + 0x18]	! arg1, 0
	stx	%g0, [%sp + 2047 + 128 + 0x20]	! ret1
	call	%l7
	 add	%sp, (2047 + 128), %o0		! argument array

	ldx	[%sp + 2047 + 128 + 0x20], %l4	! prom root node
	mov	(1b - prom_root_node), %l1
	sub	%l0, %l1, %l1
	stw	%l4, [%l1]

	mov	(1b - prom_getprop_name), %l1
	mov	(1b - prom_compatible_name),<