228 lines
5.6 KiB
ArmAsm
228 lines
5.6 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 1995 Waldorf Electronics
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* Written by Ralf Baechle and Andreas Busse
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 Ralf Baechle
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* Copyright (C) 1996 Paul M. Antoine
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* Modified for DECStation and hence R3000 support by Paul M. Antoine
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* Further modifications by David S. Miller and Harald Koerfgen
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Kevin Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <asm/asm.h>
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#include <asm/regdef.h>
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#include <asm/page.h>
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#include <asm/mipsregs.h>
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#include <asm/stackframe.h>
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#ifdef CONFIG_SGI_IP27
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#include <asm/sn/addrs.h>
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#include <asm/sn/sn0/hubni.h>
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#include <asm/sn/klkernvars.h>
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#endif
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.macro ARC64_TWIDDLE_PC
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#if defined(CONFIG_ARC64) || defined(CONFIG_MAPPED_KERNEL)
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/* We get launched at a XKPHYS address but the kernel is linked to
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run at a KSEG0 address, so jump there. */
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PTR_LA t0, \@f
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jr t0
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\@:
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#endif
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.endm
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#ifdef CONFIG_SGI_IP27
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/*
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* outputs the local nasid into res. IP27 stuff.
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*/
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.macro GET_NASID_ASM res
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dli \res, LOCAL_HUB_ADDR(NI_STATUS_REV_ID)
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ld \res, (\res)
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and \res, NSRI_NODEID_MASK
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dsrl \res, NSRI_NODEID_SHFT
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.endm
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#endif /* CONFIG_SGI_IP27 */
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/*
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* inputs are the text nasid in t1, data nasid in t2.
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*/
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.macro MAPPED_KERNEL_SETUP_TLB
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#ifdef CONFIG_MAPPED_KERNEL
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/*
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* This needs to read the nasid - assume 0 for now.
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* Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0,
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* 0+DVG in tlblo_1.
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*/
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dli t0, 0xffffffffc0000000
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dmtc0 t0, CP0_ENTRYHI
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li t0, 0x1c000 # Offset of text into node memory
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dsll t1, NASID_SHFT # Shift text nasid into place
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dsll t2, NASID_SHFT # Same for data nasid
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or t1, t1, t0 # Physical load address of kernel text
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or t2, t2, t0 # Physical load address of kernel data
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dsrl t1, 12 # 4K pfn
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dsrl t2, 12 # 4K pfn
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dsll t1, 6 # Get pfn into place
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dsll t2, 6 # Get pfn into place
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li t0, ((_PAGE_GLOBAL|_PAGE_VALID| _CACHE_CACHABLE_COW) >> 6)
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or t0, t0, t1
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mtc0 t0, CP0_ENTRYLO0 # physaddr, VG, cach exlwr
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li t0, ((_PAGE_GLOBAL|_PAGE_VALID| _PAGE_DIRTY|_CACHE_CACHABLE_COW) >> 6)
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or t0, t0, t2
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mtc0 t0, CP0_ENTRYLO1 # physaddr, DVG, cach exlwr
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li t0, 0x1ffe000 # MAPPED_KERN_TLBMASK, TLBPGMASK_16M
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mtc0 t0, CP0_PAGEMASK
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li t0, 0 # KMAP_INX
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mtc0 t0, CP0_INDEX
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li t0, 1
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mtc0 t0, CP0_WIRED
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tlbwi
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#else
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mtc0 zero, CP0_WIRED
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#endif
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.endm
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/*
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* For the moment disable interrupts, mark the kernel mode and
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* set ST0_KX so that the CPU does not spit fire when using
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* 64-bit addresses. A full initialization of the CPU's status
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* register is done later in per_cpu_trap_init().
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*/
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.macro setup_c0_status set clr
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.set push
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mfc0 t0, CP0_STATUS
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or t0, ST0_CU0|\set|0x1f|\clr
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xor t0, 0x1f|\clr
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mtc0 t0, CP0_STATUS
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.set noreorder
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sll zero,3 # ehb
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.set pop
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.endm
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.macro setup_c0_status_pri
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#ifdef CONFIG_64BIT
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setup_c0_status ST0_KX 0
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#else
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setup_c0_status 0 0
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#endif
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.endm
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.macro setup_c0_status_sec
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#ifdef CONFIG_64BIT
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setup_c0_status ST0_KX ST0_BEV
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#else
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setup_c0_status 0 ST0_BEV
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#endif
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.endm
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/*
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* Reserved space for exception handlers.
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* Necessary for machines which link their kernels at KSEG0.
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*/
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.fill 0x400
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EXPORT(stext) # used for profiling
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EXPORT(_stext)
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#ifdef CONFIG_QEMU
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/*
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* Give us a fighting chance of running if execution beings at the
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* kernel load address. This is needed because this platform does
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* not have a ELF loader yet.
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*/
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j kernel_entry
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#endif
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__INIT
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NESTED(kernel_entry, 16, sp) # kernel entry point
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setup_c0_status_pri
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#ifdef CONFIG_SGI_IP27
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GET_NASID_ASM t1
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move t2, t1 # text and data are here
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MAPPED_KERNEL_SETUP_TLB
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#endif /* IP27 */
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ARC64_TWIDDLE_PC
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PTR_LA t0, __bss_start # clear .bss
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LONG_S zero, (t0)
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PTR_LA t1, __bss_stop - LONGSIZE
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1:
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PTR_ADDIU t0, LONGSIZE
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LONG_S zero, (t0)
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bne t0, t1, 1b
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LONG_S a0, fw_arg0 # firmware arguments
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LONG_S a1, fw_arg1
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LONG_S a2, fw_arg2
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LONG_S a3, fw_arg3
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MTC0 zero, CP0_CONTEXT # clear context register
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PTR_LA $28, init_thread_union
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PTR_ADDIU sp, $28, _THREAD_SIZE - 32
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set_saved_sp sp, t0, t1
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PTR_SUBU sp, 4 * SZREG # init stack pointer
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j start_kernel
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END(kernel_entry)
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#ifdef CONFIG_QEMU
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__INIT
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#endif
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#ifdef CONFIG_SMP
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/*
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* SMP slave cpus entry point. Board specific code for bootstrap calls this
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* function after setting up the stack and gp registers.
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*/
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NESTED(smp_bootstrap, 16, sp)
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setup_c0_status_sec
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#ifdef CONFIG_SGI_IP27
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GET_NASID_ASM t1
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dli t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
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KLDIR_OFF_POINTER + CAC_BASE
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dsll t1, NASID_SHFT
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or t0, t0, t1
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ld t0, 0(t0) # t0 points to kern_vars struct
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lh t1, KV_RO_NASID_OFFSET(t0)
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lh t2, KV_RW_NASID_OFFSET(t0)
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MAPPED_KERNEL_SETUP_TLB
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ARC64_TWIDDLE_PC
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#endif /* CONFIG_SGI_IP27 */
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j start_secondary
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END(smp_bootstrap)
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#endif /* CONFIG_SMP */
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__FINIT
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.comm kernelsp, NR_CPUS * 8, 8
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.comm pgd_current, NR_CPUS * 8, 8
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.comm fw_arg0, SZREG, SZREG # firmware arguments
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.comm fw_arg1, SZREG, SZREG
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.comm fw_arg2, SZREG, SZREG
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.comm fw_arg3, SZREG, SZREG
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.macro page name, order
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.comm \name, (_PAGE_SIZE << \order), (_PAGE_SIZE << \order)
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.endm
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/*
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* On 64-bit we've got three-level pagetables with a slightly
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* different layout ...
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*/
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page swapper_pg_dir, _PGD_ORDER
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#ifdef CONFIG_64BIT
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page invalid_pmd_table, _PMD_ORDER
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#endif
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page invalid_pte_table, _PTE_ORDER
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