paljtokern.S revision 8008:257eb95aead3 
1#include "dc21164FromGasSources.h"	// DECchip 21164 specific definitions
2#include "ev5_defs.h"
3#include "fromHudsonOsf.h"	// OSF/1 specific definitions
4#include "fromHudsonMacros.h"	// Global macro definitions
5#include "ev5_impure.h"	// Scratch & logout area data structures
6#include "platform.h"	// Platform specific definitions
7
8        .global	palJToKern
9        .text	3
10palJToKern:
11/* Jump to kernel
12args:
13        Kernel address	- a0
14        PCBB		- a1
15        First free PFN	- a3?
16
17        Enable kseg addressing in ICSR
18        Enable kseg addressing in MCSR
19        Set VTBR -- Set to 1GB as per SRM, or maybe 8GB??
20        Set PCBB -- pass pointer in arg
21        Set PTBR -- get it out of PCB
22        Set KSP  -- get it out of PCB
23
24        Jump to kernel address
25
26        Kernel args-
27                s0 first free PFN
28                s1 ptbr
29                s2 argc 0
30                s3 argv NULL
31                s5 osf_param (sysconfigtab) NULL
32 */
33
34        ALIGN_BRANCH
35
36        ldq_p	a0, 0(zero)
37        ldq_p	a1, 8(zero)
38        ldq_p	a3, 16(zero)
39
40#ifdef undef
41        LDLI(t0,0x200000000)		// 8GB, like the Mikasa
42        LDLI(t0,0x40000000)		// 1GB, like the SRM
43        STALL			// don't dual issue the load with mtpr -pb
44#endif
45        /* Point the Vptbr at 8GB */
46        lda	t0, 0x1(zero)
47        sll	t0, 33, t0
48
49        mtpr	t0, mVptBr	// Load Mbox copy
50        mtpr	t0, iVptBr	// Load Ibox copy
51        STALL			// don't dual issue the load with mtpr -pb
52
53        /* Turn on superpage mapping in the mbox and icsr */
54        lda	t0, (2<<MCSR_V_SP)(zero) // Get a '10' (binary) in MCSR<SP>
55        STALL			// don't dual issue the load with mtpr -pb
56        mtpr	t0, mcsr		// Set the super page mode enable bit
57        STALL			// don't dual issue the load with mtpr -pb
58
59        lda	t0, 0(zero)
60        mtpr	t0, dtbAsn
61        mtpr	t0, itbAsn
62
63        LDLI	(t1,0x20000000)
64        STALL			// don't dual issue the load with mtpr -pb
65        mfpr	t0, icsr		// Enable superpage mapping
66        STALL			// don't dual issue the load with mtpr -pb
67        bis	t0, t1, t0
68        mtpr	t0, icsr
69
70        STALL                           // Required stall to update chip ...
71        STALL
72        STALL
73        STALL
74        STALL
75
76        ldq_p	s0, PCB_Q_PTBR(a1)
77        sll	s0, VA_S_OFF, s0	// Shift PTBR into position
78        STALL			// don't dual issue the load with mtpr -pb
79        mtpr	s0, ptPtbr		// PHYSICAL MBOX INST -> MT PT20 IN 0,1
80        STALL			// don't dual issue the load with mtpr -pb
81        ldq_p	sp, PCB_Q_KSP(a1)
82
83        mtpr	a0, excAddr		// Load the dispatch address.
84        STALL			// don't dual issue the load with mtpr -pb
85        bis	a3, zero, a0		// first free PFN
86        ldq_p	a1, PCB_Q_PTBR(a1)	// ptbr
87        ldq_p	a2, 24(zero)		// argc
88        ldq_p	a3, 32(zero)		// argv
89        ldq_p	a4, 40(zero)		// environ
90        lda	a5, 0(zero)		// osf_param
91        STALL			// don't dual issue the load with mtpr -pb
92        mtpr	zero, dtbIa		// Flush all D-stream TB entries
93        mtpr	zero, itbIa		// Flush all I-stream TB entries
94        br	zero, 2f
95
96        ALIGN_BLOCK
97
982:	NOP
99        mtpr	zero, icFlush		// Flush the icache.
100        NOP
101        NOP
102
103        NOP				// Required NOPs ... 1-10
104        NOP
105        NOP
106        NOP
107        NOP
108        NOP
109        NOP
110        NOP
111        NOP
112        NOP
113
114        NOP                           // Required NOPs ... 11-20
115        NOP
116        NOP
117        NOP
118        NOP
119        NOP
120        NOP
121        NOP
122        NOP
123        NOP
124
125        NOP                           // Required NOPs ... 21-30
126        NOP
127        NOP
128        NOP
129        NOP
130        NOP
131        NOP
132        NOP
133        NOP
134        NOP
135
136        NOP                           // Required NOPs ... 31-40
137        NOP
138        NOP
139        NOP
140        NOP
141        NOP
142        NOP
143        NOP
144        NOP
145        NOP
146
147
148
149        NOP				// Required NOPs ... 41-44
150        NOP
151        NOP
152        NOP
153
154        hw_rei_stall				// Dispatch to kernel
155
156
157