root/arch/mips/include/asm/mach-ip27/kernel-entry-init.h

INCLUDED FROM

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000 Silicon Graphics, Inc.
   7  * Copyright (C) 2005 Ralf Baechle <ralf@linux-mips.org>
   8  */
   9 #ifndef __ASM_MACH_IP27_KERNEL_ENTRY_H
  10 #define __ASM_MACH_IP27_KERNEL_ENTRY_H
  11 
  12 #include <asm/sn/addrs.h>
  13 #include <asm/sn/sn0/hubni.h>
  14 #include <asm/sn/klkernvars.h>
  15 
  16 /*
  17  * Returns the local nasid into res.
  18  */
  19         .macro GET_NASID_ASM res
  20         dli     \res, LOCAL_HUB_ADDR(NI_STATUS_REV_ID)
  21         ld      \res, (\res)
  22         and     \res, NSRI_NODEID_MASK
  23         dsrl    \res, NSRI_NODEID_SHFT
  24         .endm
  25 
  26 /*
  27  * TLB bits
  28  */
  29 #define PAGE_GLOBAL             (1 << 6)
  30 #define PAGE_VALID              (1 << 7)
  31 #define PAGE_DIRTY              (1 << 8)
  32 #define CACHE_CACHABLE_COW      (5 << 9)
  33 
  34         /*
  35          * inputs are the text nasid in t1, data nasid in t2.
  36          */
  37         .macro MAPPED_KERNEL_SETUP_TLB
  38 #ifdef CONFIG_MAPPED_KERNEL
  39         /*
  40          * This needs to read the nasid - assume 0 for now.
  41          * Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0,
  42          * 0+DVG in tlblo_1.
  43          */
  44         dli     t0, 0xffffffffc0000000
  45         dmtc0   t0, CP0_ENTRYHI
  46         li      t0, 0x1c000             # Offset of text into node memory
  47         dsll    t1, NASID_SHFT          # Shift text nasid into place
  48         dsll    t2, NASID_SHFT          # Same for data nasid
  49         or      t1, t1, t0              # Physical load address of kernel text
  50         or      t2, t2, t0              # Physical load address of kernel data
  51         dsrl    t1, 12                  # 4K pfn
  52         dsrl    t2, 12                  # 4K pfn
  53         dsll    t1, 6                   # Get pfn into place
  54         dsll    t2, 6                   # Get pfn into place
  55         li      t0, ((PAGE_GLOBAL | PAGE_VALID | CACHE_CACHABLE_COW) >> 6)
  56         or      t0, t0, t1
  57         mtc0    t0, CP0_ENTRYLO0        # physaddr, VG, cach exlwr
  58         li      t0, ((PAGE_GLOBAL | PAGE_VALID |  PAGE_DIRTY | CACHE_CACHABLE_COW) >> 6)
  59         or      t0, t0, t2
  60         mtc0    t0, CP0_ENTRYLO1        # physaddr, DVG, cach exlwr
  61         li      t0, 0x1ffe000           # MAPPED_KERN_TLBMASK, TLBPGMASK_16M
  62         mtc0    t0, CP0_PAGEMASK
  63         li      t0, 0                   # KMAP_INX
  64         mtc0    t0, CP0_INDEX
  65         li      t0, 1
  66         mtc0    t0, CP0_WIRED
  67         tlbwi
  68 #else
  69         mtc0    zero, CP0_WIRED
  70 #endif
  71         .endm
  72 
  73 /*
  74  * Intentionally empty macro, used in head.S. Override in
  75  * arch/mips/mach-xxx/kernel-entry-init.h when necessary.
  76  */
  77         .macro  kernel_entry_setup
  78         GET_NASID_ASM   t1
  79         move            t2, t1                  # text and data are here
  80         MAPPED_KERNEL_SETUP_TLB
  81         .endm
  82 
  83 /*
  84  * Do SMP slave processor setup necessary before we can safely execute C code.
  85  */
  86         .macro  smp_slave_setup
  87         GET_NASID_ASM   t1
  88         dli     t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
  89                     KLDIR_OFF_POINTER + CAC_BASE
  90         dsll    t1, NASID_SHFT
  91         or      t0, t0, t1
  92         ld      t0, 0(t0)                       # t0 points to kern_vars struct
  93         lh      t1, KV_RO_NASID_OFFSET(t0)
  94         lh      t2, KV_RW_NASID_OFFSET(t0)
  95         MAPPED_KERNEL_SETUP_TLB
  96 
  97         /*
  98          * We might not get launched at the address the kernel is linked to,
  99          * so we jump there.
 100          */
 101         PTR_LA  t0, 0f
 102         jr      t0
 103 0:
 104         .endm
 105 
 106 #endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */