1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/linkage.h>
3 #include <linux/init.h>
4
5 #include <asm/entry.h>
6 #include <asm/page.h>
7 #include <asm/contregs.h>
8 #include <asm/sun3-head.h>
9
10 PSL_HIGHIPL = 0x2700
11 NBSG = 0x20000
12 ICACHE_ONLY = 0x00000009
13 CACHES_OFF = 0x00000008 | actually a c
14 #define MAS_STACK INT_STACK
15 ROOT_TABLE_SIZE = 128
16 PAGESIZE = 8192
17 SUN3_INVALID_PMEG = 255
18 .globl bootup_user_stack
19 .globl bootup_kernel_stack
20 .globl pg0
21 .globl swapper_pg_dir
22 .globl kernel_pmd_table
23 .globl availmem
24 .global m68k_pgtable_cachemode
25 .global kpt
26 | todo: all these should be in bss!
27 swapper_pg_dir: .skip 0x2000
28 pg0: .skip 0x2000
29 kernel_pmd_table: .skip 0x2000
30
31 .globl kernel_pg_dir
32 .equ kernel_pg_dir,kernel_pmd_table
33
34 __HEAD
35 ENTRY(_stext)
36 ENTRY(_start)
37
38 /* Firstly, disable interrupts and set up func
39 movew #PSL_HIGHIPL, %sr
40 moveq #FC_CONTROL, %d0
41 movec %d0, %sfc
42 movec %d0, %dfc
43
44 /* Make sure we're in context zero. */
45 moveq #0, %d0
46 movsb %d0, AC_CONTEXT
47
48 /* map everything the bootloader left us into
49 excess later */
50 lea (AC_SEGMAP+0),%a0
51 lea (AC_SEGMAP+KERNBASE),%a1
52 1:
53 movsb %a0@, %d1
54 movsb %d1, %a1@
55 cmpib #SUN3_INVALID_PMEG, %d1
56 beq 2f
57 addl #NBSG,%a0
58 addl #NBSG,%a1
59 jmp 1b
60
61 2:
62
63 /* Disable caches and jump to high code. */
64 moveq #ICACHE_ONLY,%d0 | Cach
65 movc %d0, %cacr | is this th
66 jmp 1f:l
67
68 /* Following code executes at high addresses (
69 1: lea init_task,%curptr
70 lea init_thread_union+THREAD_SIZE,
71
72 /* Point MSP at an invalid page to trap if it'
73 movl #(PAGESIZE),%d0
74 movc %d0,%msp
75 moveq #-1,%d0
76 movsb %d0,(AC_SEGMAP+0x0)
77
78 jbsr sun3_init
79
80 jbsr base_trap_init
81
82 jbsr start_kernel
83 trap #15
84
85 .data
86 .even
87 kpt:
88 .long 0
89 availmem:
90 .long 0
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