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 savely 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
1030:
104	.endm
105
106#endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */
107