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/agent.h>
14#include <asm/sn/klkernvars.h>
15
16/*
17 * TLB bits
18 */
19#define PAGE_GLOBAL		(1 << 6)
20#define PAGE_VALID		(1 << 7)
21#define PAGE_DIRTY		(1 << 8)
22#define CACHE_CACHABLE_COW	(5 << 9)
23
24	/*
25	 * inputs are the text nasid in t1, data nasid in t2.
26	 */
27	.macro MAPPED_KERNEL_SETUP_TLB
28#ifdef CONFIG_MAPPED_KERNEL
29	/*
30	 * This needs to read the nasid - assume 0 for now.
31	 * Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0,
32	 * 0+DVG in tlblo_1.
33	 */
34	dli	t0, 0xffffffffc0000000
35	dmtc0	t0, CP0_ENTRYHI
36	li	t0, 0x1c000		# Offset of text into node memory
37	dsll	t1, NASID_SHFT		# Shift text nasid into place
38	dsll	t2, NASID_SHFT		# Same for data nasid
39	or	t1, t1, t0		# Physical load address of kernel text
40	or	t2, t2, t0		# Physical load address of kernel data
41	dsrl	t1, 12			# 4K pfn
42	dsrl	t2, 12			# 4K pfn
43	dsll	t1, 6			# Get pfn into place
44	dsll	t2, 6			# Get pfn into place
45	li	t0, ((PAGE_GLOBAL | PAGE_VALID | CACHE_CACHABLE_COW) >> 6)
46	or	t0, t0, t1
47	mtc0	t0, CP0_ENTRYLO0	# physaddr, VG, cach exlwr
48	li	t0, ((PAGE_GLOBAL | PAGE_VALID |  PAGE_DIRTY | CACHE_CACHABLE_COW) >> 6)
49	or	t0, t0, t2
50	mtc0	t0, CP0_ENTRYLO1	# physaddr, DVG, cach exlwr
51	li	t0, 0x1ffe000		# MAPPED_KERN_TLBMASK, TLBPGMASK_16M
52	mtc0	t0, CP0_PAGEMASK
53	li	t0, 0			# KMAP_INX
54	mtc0	t0, CP0_INDEX
55	li	t0, 1
56	mtc0	t0, CP0_WIRED
57	tlbwi
58#else
59	mtc0	zero, CP0_WIRED
60#endif
61	.endm
62
63/*
64 * Intentionally empty macro, used in head.S. Override in
65 * arch/mips/mach-xxx/kernel-entry-init.h when necessary.
66 */
67	.macro	kernel_entry_setup
68	GET_NASID_ASM	t1
69	move		t2, t1			# text and data are here
70	MAPPED_KERNEL_SETUP_TLB
71	.endm
72
73/*
74 * Do SMP slave processor setup necessary before we can safely execute C code.
75 */
76	.macro	smp_slave_setup
77	GET_NASID_ASM	t1
78	dli	t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
79		    KLDIR_OFF_POINTER + CAC_BASE
80	dsll	t1, NASID_SHFT
81	or	t0, t0, t1
82	ld	t0, 0(t0)			# t0 points to kern_vars struct
83	lh	t1, KV_RO_NASID_OFFSET(t0)
84	lh	t2, KV_RW_NASID_OFFSET(t0)
85	MAPPED_KERNEL_SETUP_TLB
86
87	/*
88	 * We might not get launched at the address the kernel is linked to,
89	 * so we jump there.
90	 */
91	PTR_LA	t0, 0f
92	jr	t0
930:
94	.endm
95
96#endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */

 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 * Intentionally empty macro, used in head.S. Override in
28 * arch/mips/mach-xxx/kernel-entry-init.h when necessary.
29 */
30	.macro	kernel_entry_setup
31	GET_NASID_ASM	t1
32	move		t2, t1			# text and data are here
33	MAPPED_KERNEL_SETUP_TLB
34	.endm
35
36/*
37 * Do SMP slave processor setup necessary before we can savely execute C code.
38 */
39	.macro	smp_slave_setup
40	GET_NASID_ASM	t1
41	dli	t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
42		    KLDIR_OFF_POINTER + CAC_BASE
43	dsll	t1, NASID_SHFT
44	or	t0, t0, t1
45	ld	t0, 0(t0)			# t0 points to kern_vars struct
46	lh	t1, KV_RO_NASID_OFFSET(t0)
47	lh	t2, KV_RW_NASID_OFFSET(t0)
48	MAPPED_KERNEL_SETUP_TLB
49
50	/*
51	 * We might not get launched at the address the kernel is linked to,
52	 * so we jump there.
53	 */
54	PTR_LA  t0, 0f
55	jr      t0
560:
57	.endm
58
59#endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */