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
6 * Copyright (C) 2000 Silicon Graphics, Inc.
7 * Copyright (C) 2005 Ralf Baechle <ralf@linux-mips.org>
9 #ifndef __ASM_MACH_IP27_KERNEL_ENTRY_H
10 #define __ASM_MACH_IP27_KERNEL_ENTRY_H
12 #include <asm/sn/addrs.h>
13 #include <asm/sn/sn0/hubni.h>
14 #include <asm/sn/klkernvars.h>
17 * Returns the local nasid into res.
19 .macro GET_NASID_ASM res
20 dli \res, LOCAL_HUB_ADDR(NI_STATUS_REV_ID)
22 and \res, NSRI_NODEID_MASK
23 dsrl \res, NSRI_NODEID_SHFT
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)
35 * inputs are the text nasid in t1, data nasid in t2.
37 .macro MAPPED_KERNEL_SETUP_TLB
38 #ifdef CONFIG_MAPPED_KERNEL
40 * This needs to read the nasid - assume 0 for now.
41 * Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0,
44 dli t0, 0xffffffffc0000000
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
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)
57 mtc0 t0, CP0_ENTRYLO0 # physaddr, VG, cach exlwr
58 li t0, ((PAGE_GLOBAL | PAGE_VALID | PAGE_DIRTY | CACHE_CACHABLE_COW) >> 6)
60 mtc0 t0, CP0_ENTRYLO1 # physaddr, DVG, cach exlwr
61 li t0, 0x1ffe000 # MAPPED_KERN_TLBMASK, TLBPGMASK_16M
74 * Intentionally empty macro, used in head.S. Override in
75 * arch/mips/mach-xxx/kernel-entry-init.h when necessary.
77 .macro kernel_entry_setup
79 move t2, t1 # text and data are here
80 MAPPED_KERNEL_SETUP_TLB
84 * Do SMP slave processor setup necessary before we can safely execute C code.
86 .macro smp_slave_setup
88 dli t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
89 KLDIR_OFF_POINTER + CAC_BASE
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
98 * We might not get launched at the address the kernel is linked to,
106 #endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */