forked from luck/tmp_suning_uos_patched
516 lines
13 KiB
ArmAsm
516 lines
13 KiB
ArmAsm
/* $Id: head.S,v 1.87 2002/02/09 19:49:31 davem Exp $
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* head.S: Initial boot code for the Sparc64 port of Linux.
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*
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* Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au)
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
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*/
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#include <linux/config.h>
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#include <linux/version.h>
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#include <linux/errno.h>
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#include <asm/thread_info.h>
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#include <asm/asi.h>
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#include <asm/pstate.h>
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#include <asm/ptrace.h>
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#include <asm/spitfire.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/errno.h>
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#include <asm/signal.h>
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#include <asm/processor.h>
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#include <asm/lsu.h>
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#include <asm/dcr.h>
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#include <asm/dcu.h>
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#include <asm/head.h>
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#include <asm/ttable.h>
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#include <asm/mmu.h>
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#include <asm/cpudata.h>
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/* This section from from _start to sparc64_boot_end should fit into
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* 0x0000000000404000 to 0x0000000000408000.
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*/
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.text
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.globl start, _start, stext, _stext
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_start:
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start:
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_stext:
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stext:
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! 0x0000000000404000
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b sparc64_boot
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flushw /* Flush register file. */
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/* This stuff has to be in sync with SILO and other potential boot loaders
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* Fields should be kept upward compatible and whenever any change is made,
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* HdrS version should be incremented.
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*/
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.global root_flags, ram_flags, root_dev
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.global sparc_ramdisk_image, sparc_ramdisk_size
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.global sparc_ramdisk_image64
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.ascii "HdrS"
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.word LINUX_VERSION_CODE
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/* History:
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*
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* 0x0300 : Supports being located at other than 0x4000
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* 0x0202 : Supports kernel params string
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* 0x0201 : Supports reboot_command
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*/
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.half 0x0301 /* HdrS version */
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root_flags:
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.half 1
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root_dev:
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.half 0
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ram_flags:
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.half 0
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sparc_ramdisk_image:
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.word 0
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sparc_ramdisk_size:
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.word 0
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.xword reboot_command
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.xword bootstr_info
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sparc_ramdisk_image64:
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.xword 0
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.word _end
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/* PROM cif handler code address is in %o4. */
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sparc64_boot:
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1: rd %pc, %g7
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set 1b, %g1
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cmp %g1, %g7
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be,pn %xcc, sparc64_boot_after_remap
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mov %o4, %l7
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/* We need to remap the kernel. Use position independant
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* code to remap us to KERNBASE.
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*
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* SILO can invoke us with 32-bit address masking enabled,
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* so make sure that's clear.
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*/
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rdpr %pstate, %g1
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andn %g1, PSTATE_AM, %g1
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wrpr %g1, 0x0, %pstate
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ba,a,pt %xcc, 1f
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.globl prom_finddev_name, prom_chosen_path
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.globl prom_getprop_name, prom_mmu_name
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.globl prom_callmethod_name, prom_translate_name
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.globl prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
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.globl prom_boot_mapped_pc, prom_boot_mapping_mode
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.globl prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
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prom_finddev_name:
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.asciz "finddevice"
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prom_chosen_path:
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.asciz "/chosen"
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prom_getprop_name:
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.asciz "getprop"
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prom_mmu_name:
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.asciz "mmu"
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prom_callmethod_name:
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.asciz "call-method"
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prom_translate_name:
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.asciz "translate"
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prom_map_name:
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.asciz "map"
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prom_unmap_name:
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.asciz "unmap"
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.align 4
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prom_mmu_ihandle_cache:
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.word 0
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prom_boot_mapped_pc:
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.word 0
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prom_boot_mapping_mode:
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.word 0
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.align 8
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prom_boot_mapping_phys_high:
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.xword 0
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prom_boot_mapping_phys_low:
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.xword 0
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1:
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rd %pc, %l0
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mov (1b - prom_finddev_name), %l1
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mov (1b - prom_chosen_path), %l2
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mov (1b - prom_boot_mapped_pc), %l3
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sub %l0, %l1, %l1
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sub %l0, %l2, %l2
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sub %l0, %l3, %l3
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stw %l0, [%l3]
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sub %sp, (192 + 128), %sp
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/* chosen_node = prom_finddevice("/chosen") */
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stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
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mov 1, %l3
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stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
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stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
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stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/chosen"
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stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
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call %l7
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add %sp, (2047 + 128), %o0 ! argument array
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ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node
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mov (1b - prom_getprop_name), %l1
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mov (1b - prom_mmu_name), %l2
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mov (1b - prom_mmu_ihandle_cache), %l5
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sub %l0, %l1, %l1
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sub %l0, %l2, %l2
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sub %l0, %l5, %l5
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/* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */
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stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
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mov 4, %l3
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stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
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mov 1, %l3
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stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
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stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, chosen_node
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stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu"
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stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache
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mov 4, %l3
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stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3)
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stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
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call %l7
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add %sp, (2047 + 128), %o0 ! argument array
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mov (1b - prom_callmethod_name), %l1
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mov (1b - prom_translate_name), %l2
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sub %l0, %l1, %l1
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sub %l0, %l2, %l2
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lduw [%l5], %l5 ! prom_mmu_ihandle_cache
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stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method"
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mov 3, %l3
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stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3
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mov 5, %l3
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stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5
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stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate"
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stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache
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/* PAGE align */
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srlx %l0, 13, %l3
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sllx %l3, 13, %l3
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stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC
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stx %g0, [%sp + 2047 + 128 + 0x30] ! res1
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stx %g0, [%sp + 2047 + 128 + 0x38] ! res2
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stx %g0, [%sp + 2047 + 128 + 0x40] ! res3
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stx %g0, [%sp + 2047 + 128 + 0x48] ! res4
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stx %g0, [%sp + 2047 + 128 + 0x50] ! res5
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call %l7
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add %sp, (2047 + 128), %o0 ! argument array
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ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode
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mov (1b - prom_boot_mapping_mode), %l4
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sub %l0, %l4, %l4
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stw %l1, [%l4]
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mov (1b - prom_boot_mapping_phys_high), %l4
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sub %l0, %l4, %l4
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ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high
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stx %l2, [%l4 + 0x0]
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ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low
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/* 4MB align */
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srlx %l3, 22, %l3
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sllx %l3, 22, %l3
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stx %l3, [%l4 + 0x8]
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/* Leave service as-is, "call-method" */
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mov 7, %l3
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stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7
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mov 1, %l3
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stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
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mov (1b - prom_map_name), %l3
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sub %l0, %l3, %l3
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stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map"
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/* Leave arg2 as-is, prom_mmu_ihandle_cache */
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mov -1, %l3
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stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default)
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sethi %hi(8 * 1024 * 1024), %l3
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stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: size (8MB)
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sethi %hi(KERNBASE), %l3
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stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE)
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stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty
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mov (1b - prom_boot_mapping_phys_low), %l3
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sub %l0, %l3, %l3
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ldx [%l3], %l3
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stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr
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call %l7
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add %sp, (2047 + 128), %o0 ! argument array
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add %sp, (192 + 128), %sp
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sparc64_boot_after_remap:
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BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
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BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
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ba,pt %xcc, spitfire_boot
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nop
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cheetah_plus_boot:
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/* Preserve OBP chosen DCU and DCR register settings. */
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ba,pt %xcc, cheetah_generic_boot
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nop
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cheetah_boot:
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mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
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wr %g1, %asr18
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sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
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or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
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sllx %g7, 32, %g7
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or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
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stxa %g7, [%g0] ASI_DCU_CONTROL_REG
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membar #Sync
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cheetah_generic_boot:
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mov TSB_EXTENSION_P, %g3
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stxa %g0, [%g3] ASI_DMMU
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stxa %g0, [%g3] ASI_IMMU
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membar #Sync
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mov TSB_EXTENSION_S, %g3
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stxa %g0, [%g3] ASI_DMMU
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membar #Sync
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mov TSB_EXTENSION_N, %g3
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stxa %g0, [%g3] ASI_DMMU
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stxa %g0, [%g3] ASI_IMMU
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membar #Sync
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ba,a,pt %xcc, jump_to_sun4u_init
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spitfire_boot:
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/* Typically PROM has already enabled both MMU's and both on-chip
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* caches, but we do it here anyway just to be paranoid.
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*/
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mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
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stxa %g1, [%g0] ASI_LSU_CONTROL
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membar #Sync
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jump_to_sun4u_init:
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/*
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* Make sure we are in privileged mode, have address masking,
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* using the ordinary globals and have enabled floating
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* point.
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*
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* Again, typically PROM has left %pil at 13 or similar, and
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* (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
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*/
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wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
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wr %g0, 0, %fprs
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set sun4u_init, %g2
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jmpl %g2 + %g0, %g0
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nop
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sun4u_init:
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/* Set ctx 0 */
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mov PRIMARY_CONTEXT, %g7
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stxa %g0, [%g7] ASI_DMMU
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membar #Sync
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mov SECONDARY_CONTEXT, %g7
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stxa %g0, [%g7] ASI_DMMU
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membar #Sync
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BRANCH_IF_ANY_CHEETAH(g1,g7,cheetah_tlb_fixup)
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ba,pt %xcc, spitfire_tlb_fixup
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nop
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cheetah_tlb_fixup:
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mov 2, %g2 /* Set TLB type to cheetah+. */
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BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
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mov 1, %g2 /* Set TLB type to cheetah. */
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1: sethi %hi(tlb_type), %g1
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stw %g2, [%g1 + %lo(tlb_type)]
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/* Patch copy/page operations to cheetah optimized versions. */
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call cheetah_patch_copyops
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nop
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call cheetah_patch_copy_page
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nop
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call cheetah_patch_cachetlbops
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nop
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ba,pt %xcc, tlb_fixup_done
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nop
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spitfire_tlb_fixup:
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/* Set TLB type to spitfire. */
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mov 0, %g2
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sethi %hi(tlb_type), %g1
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stw %g2, [%g1 + %lo(tlb_type)]
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tlb_fixup_done:
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sethi %hi(init_thread_union), %g6
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or %g6, %lo(init_thread_union), %g6
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ldx [%g6 + TI_TASK], %g4
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mov %sp, %l6
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mov %o4, %l7
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wr %g0, ASI_P, %asi
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mov 1, %g1
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sllx %g1, THREAD_SHIFT, %g1
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sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
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add %g6, %g1, %sp
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mov 0, %fp
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/* Set per-cpu pointer initially to zero, this makes
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* the boot-cpu use the in-kernel-image per-cpu areas
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* before setup_per_cpu_area() is invoked.
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*/
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clr %g5
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wrpr %g0, 0, %wstate
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wrpr %g0, 0x0, %tl
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/* Clear the bss */
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sethi %hi(__bss_start), %o0
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or %o0, %lo(__bss_start), %o0
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sethi %hi(_end), %o1
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or %o1, %lo(_end), %o1
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call __bzero
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sub %o1, %o0, %o1
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mov %l6, %o1 ! OpenPROM stack
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call prom_init
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mov %l7, %o0 ! OpenPROM cif handler
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/* Off we go.... */
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call start_kernel
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nop
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/* Not reached... */
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/* This is meant to allow the sharing of this code between
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* boot processor invocation (via setup_tba() below) and
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* secondary processor startup (via trampoline.S). The
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* former does use this code, the latter does not yet due
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* to some complexities. That should be fixed up at some
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* point.
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*
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* There used to be enormous complexity wrt. transferring
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* over from the firwmare's trap table to the Linux kernel's.
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* For example, there was a chicken & egg problem wrt. building
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* the OBP page tables, yet needing to be on the Linux kernel
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* trap table (to translate PAGE_OFFSET addresses) in order to
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* do that.
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*
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* We now handle OBP tlb misses differently, via linear lookups
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* into the prom_trans[] array. So that specific problem no
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* longer exists. Yet, unfortunately there are still some issues
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* preventing trampoline.S from using this code... ho hum.
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*/
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.globl setup_trap_table
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setup_trap_table:
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save %sp, -192, %sp
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/* Force interrupts to be disabled. */
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rdpr %pstate, %o1
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andn %o1, PSTATE_IE, %o1
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wrpr %o1, 0x0, %pstate
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wrpr %g0, 15, %pil
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/* Make the firmware call to jump over to the Linux trap table. */
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call prom_set_trap_table
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sethi %hi(sparc64_ttable_tl0), %o0
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/* Start using proper page size encodings in ctx register. */
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sethi %hi(sparc64_kern_pri_context), %g3
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ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
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mov PRIMARY_CONTEXT, %g1
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stxa %g2, [%g1] ASI_DMMU
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membar #Sync
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/* Kill PROM timer */
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sethi %hi(0x80000000), %o2
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sllx %o2, 32, %o2
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wr %o2, 0, %tick_cmpr
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BRANCH_IF_ANY_CHEETAH(o2,o3,1f)
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ba,pt %xcc, 2f
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nop
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/* Disable STICK_INT interrupts. */
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1:
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sethi %hi(0x80000000), %o2
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sllx %o2, 32, %o2
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wr %o2, %asr25
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2:
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wrpr %g0, %g0, %wstate
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call init_irqwork_curcpu
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nop
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|
/* Now we can turn interrupts back on. */
|
|
rdpr %pstate, %o1
|
|
or %o1, PSTATE_IE, %o1
|
|
wrpr %o1, 0, %pstate
|
|
wrpr %g0, 0x0, %pil
|
|
|
|
ret
|
|
restore
|
|
|
|
.globl setup_tba
|
|
setup_tba:
|
|
save %sp, -192, %sp
|
|
|
|
/* The boot processor is the only cpu which invokes this
|
|
* routine, the other cpus set things up via trampoline.S.
|
|
* So save the OBP trap table address here.
|
|
*/
|
|
rdpr %tba, %g7
|
|
sethi %hi(prom_tba), %o1
|
|
or %o1, %lo(prom_tba), %o1
|
|
stx %g7, [%o1]
|
|
|
|
call setup_trap_table
|
|
nop
|
|
|
|
ret
|
|
restore
|
|
sparc64_boot_end:
|
|
|
|
#include "systbls.S"
|
|
#include "ktlb.S"
|
|
#include "tsb.S"
|
|
#include "etrap.S"
|
|
#include "rtrap.S"
|
|
#include "winfixup.S"
|
|
#include "entry.S"
|
|
|
|
/*
|
|
* The following skip makes sure the trap table in ttable.S is aligned
|
|
* on a 32K boundary as required by the v9 specs for TBA register.
|
|
*
|
|
* We align to a 32K boundary, then we have the 32K kernel TSB,
|
|
* then the 32K aligned trap table.
|
|
*/
|
|
1:
|
|
.skip 0x4000 + _start - 1b
|
|
|
|
.globl swapper_tsb
|
|
swapper_tsb:
|
|
.skip (32 * 1024)
|
|
|
|
! 0x0000000000408000
|
|
|
|
#include "ttable.S"
|
|
|
|
.data
|
|
.align 8
|
|
.globl prom_tba, tlb_type
|
|
prom_tba: .xword 0
|
|
tlb_type: .word 0 /* Must NOT end up in BSS */
|
|
.section ".fixup",#alloc,#execinstr
|
|
|
|
.globl __ret_efault, __retl_efault
|
|
__ret_efault:
|
|
ret
|
|
restore %g0, -EFAULT, %o0
|
|
__retl_efault:
|
|
retl
|
|
mov -EFAULT, %o0
|