107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/*
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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) 2000 Silicon Graphics, Inc.
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* Copyright (C) 2005 Ralf Baechle <ralf@linux-mips.org>
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*/
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#ifndef __ASM_MACH_IP27_KERNEL_ENTRY_H
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#define __ASM_MACH_IP27_KERNEL_ENTRY_H
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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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/*
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* Returns the local nasid into res.
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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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/*
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* TLB bits
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*/
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#define PAGE_GLOBAL (1 << 6)
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#define PAGE_VALID (1 << 7)
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#define PAGE_DIRTY (1 << 8)
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#define CACHE_CACHABLE_COW (5 << 9)
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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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* Intentionally empty macro, used in head.S. Override in
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* arch/mips/mach-xxx/kernel-entry-init.h when necessary.
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*/
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.macro kernel_entry_setup
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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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.endm
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/*
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* Do SMP slave processor setup necessary before we can safely execute C code.
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*/
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.macro smp_slave_setup
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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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/*
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* We might not get launched at the address the kernel is linked to,
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* so we jump there.
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*/
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PTR_LA t0, 0f
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jr t0
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0:
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.endm
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#endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */
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