1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* hvtramp.S: Hypervisor start-cpu trampoline
3 *
4 * Copyright (C) 2007, 2008 David S. Miller <da
5 */
6
7
8 #include <asm/thread_info.h>
9 #include <asm/hypervisor.h>
10 #include <asm/scratchpad.h>
11 #include <asm/spitfire.h>
12 #include <asm/hvtramp.h>
13 #include <asm/pstate.h>
14 #include <asm/ptrace.h>
15 #include <asm/head.h>
16 #include <asm/asi.h>
17 #include <asm/pil.h>
18
19 .align 8
20 .globl hv_cpu_startup, hv_cpu
21
22 /* This code executes directly out of
23 * with physical addressing (va==pa).
24 * our client argument which for Linux
25 * a descriptor data structure which d
26 * MMU entries we need to load up.
27 *
28 * After we set things up we enable th
29 * into the kernel.
30 *
31 * First setup basic privileged cpu st
32 */
33 hv_cpu_startup:
34 SET_GL(0)
35 wrpr %g0, PIL_NORMAL_MAX, %
36 wrpr %g0, 0, %canrestore
37 wrpr %g0, 0, %otherwin
38 wrpr %g0, 6, %cansave
39 wrpr %g0, 6, %cleanwin
40 wrpr %g0, 0, %cwp
41 wrpr %g0, 0, %wstate
42 wrpr %g0, 0, %tl
43
44 sethi %hi(sparc64_ttable_tl0
45 wrpr %g1, %tba
46
47 mov %o0, %l0
48
49 lduw [%l0 + HVTRAMP_DESCR_C
50 mov SCRATCHPAD_CPUID, %g2
51 stxa %g1, [%g2] ASI_SCRATCH
52
53 ldx [%l0 + HVTRAMP_DESCR_F
54 stxa %g2, [%g0] ASI_SCRATCH
55
56 mov 0, %l1
57 lduw [%l0 + HVTRAMP_DESCR_N
58 add %l0, HVTRAMP_DESCR_MAP
59
60 1: ldx [%l3 + HVTRAMP_MAPPING
61 clr %o1
62 ldx [%l3 + HVTRAMP_MAPPING
63 mov HV_MMU_IMMU | HV_MMU_D
64 mov HV_FAST_MMU_MAP_PERM_A
65 ta HV_FAST_TRAP
66
67 brnz,pn %o0, 80f
68 nop
69
70 add %l1, 1, %l1
71 cmp %l1, %l2
72 blt,a,pt %xcc, 1b
73 add %l3, HVTRAMP_MAPPING_S
74
75 ldx [%l0 + HVTRAMP_DESCR_F
76 mov HV_FAST_MMU_FAULT_AREA
77 ta HV_FAST_TRAP
78
79 brnz,pn %o0, 80f
80 nop
81
82 wrpr %g0, (PSTATE_PRIV | PS
83
84 ldx [%l0 + HVTRAMP_DESCR_T
85
86 mov 1, %o0
87 set 1f, %o1
88 mov HV_FAST_MMU_ENABLE, %o
89 ta HV_FAST_TRAP
90
91 ba,pt %xcc, 80f
92 nop
93
94 1:
95 wr %g0, 0, %fprs
96 wr %g0, ASI_P, %asi
97
98 mov PRIMARY_CONTEXT, %g7
99 stxa %g0, [%g7] ASI_MMU
100 membar #Sync
101
102 mov SECONDARY_CONTEXT, %g7
103 stxa %g0, [%g7] ASI_MMU
104 membar #Sync
105
106 mov %l6, %g6
107 ldx [%g6 + TI_TASK], %g4
108
109 mov 1, %g5
110 sllx %g5, THREAD_SHIFT, %g5
111 sub %g5, (STACKFRAME_SZ +
112 add %g6, %g5, %sp
113
114 call init_irqwork_curcpu
115 nop
116 call hard_smp_processor_id
117 nop
118
119 call sun4v_register_mondo_q
120 nop
121
122 call init_cur_cpu_trap
123 mov %g6, %o0
124
125 wrpr %g0, (PSTATE_PRIV | PS
126
127 call smp_callin
128 nop
129
130 call cpu_panic
131 nop
132
133 80: ba,pt %xcc, 80b
134 nop
135
136 .align 8
137 hv_cpu_startup_end:
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