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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | #include <linux/linkage.h> |
16752e2e | 3 | #include <linux/init.h> |
1da177e4 LT |
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 clear and disable --m | |
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 | ||
6f335cab | 34 | __HEAD |
1da177e4 LT |
35 | ENTRY(_stext) |
36 | ENTRY(_start) | |
37 | ||
38 | /* Firstly, disable interrupts and set up function codes. */ | |
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 high memory, clean up the | |
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 | Cache disabled until we're ready to enable it | |
65 | movc %d0, %cacr | is this the right value? (yes --m) | |
66 | jmp 1f:l | |
67 | ||
68 | /* Following code executes at high addresses (0xE000xxx). */ | |
69 | 1: lea init_task,%curptr | get initial thread... | |
70 | lea init_thread_union+THREAD_SIZE,%sp | ...and its stack. | |
71 | ||
1da177e4 LT |
72 | /* Point MSP at an invalid page to trap if it's used. --m */ |
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 | |
91 | | todo: remove next two. --m | |
92 | is_medusa: | |
93 | .long 0 | |
94 | m68k_pgtable_cachemode: | |
95 | .long 0 | |
96 |