1 /* 1 /*
2 * Startup glue code to uncompress the kernel !! 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.
3 * 5 *
4 * (C) 2017 Helge Deller <deller@gmx.de> !! 6 * Copyright (C) 1994, 1995 Waldorf Electronics
>> 7 * Written by Ralf Baechle and Andreas Busse
>> 8 * Copyright (C) 1995 - 1999 Ralf Baechle
>> 9 * Copyright (C) 1996 Paul M. Antoine
>> 10 * Modified for DECStation and hence R3000 support by Paul M. Antoine
>> 11 * Further modifications by David S. Miller and Harald Koerfgen
>> 12 * Copyright (C) 1999 Silicon Graphics, Inc.
5 */ 13 */
6 14
7 #include <linux/init.h> !! 15 #include <asm/asm.h>
8 #include <linux/linkage.h> !! 16 #include <asm/regdef.h>
9 #include <asm/asm-offsets.h> !! 17
10 #include <asm/page.h> !! 18 LEAF(start)
11 #include <asm/psw.h> !! 19 /* Save boot rom start args */
12 #include <asm/pdc.h> !! 20 move s0, a0
13 #include <asm/assembly.h> !! 21 move s1, a1
14 #include "sizes.h" !! 22 move s2, a2
15 !! 23 move s3, a3
16 #define BOOTADDR(x) (x) <<
17 <<
18 #ifndef CONFIG_64BIT <<
19 .import $global$ /* for <<
20 #endif /*!CONFIG_64BIT*/ <<
21 <<
22 __HEAD <<
23 <<
24 ENTRY(startup) <<
25 .level PA_ASM_LEVEL <<
26 <<
27 #define PSW_W_SM 0x200 <<
28 #define PSW_W_BIT 36 <<
29 <<
30 ;! nuke the W bit, saving original val <<
31 .level 2.0 <<
32 rsm PSW_W_SM, %r1 <<
33 <<
34 .level 1.1 <<
35 extrw,u %r1, PSW_W_BIT-32, 1, %r1 <<
36 copy %r1, %arg0 <<
37 <<
38 /* Make sure sr4-sr7 are set to zero f <<
39 mtsp %r0,%sr4 <<
40 mtsp %r0,%sr5 <<
41 mtsp %r0,%sr6 <<
42 mtsp %r0,%sr7 <<
43 24
44 /* Clear BSS */ 25 /* Clear BSS */
>> 26 PTR_LA a0, _edata
>> 27 PTR_LA a2, _end
>> 28 1: PTR_S zero, 0(a0)
>> 29 PTR_ADDIU a0, a0, PTRSIZE
>> 30 bne a2, a0, 1b
>> 31
>> 32 PTR_LA a0, (.heap) /* heap address */
>> 33 PTR_LA sp, (.stack + 8192) /* stack address */
>> 34
>> 35 PTR_LA t9, decompress_kernel
>> 36 jalr t9
>> 37
>> 38 2:
>> 39 move a0, s0
>> 40 move a1, s1
>> 41 move a2, s2
>> 42 move a3, s3
>> 43 PTR_LI t9, KERNEL_ENTRY
>> 44 jalr t9
45 45
46 .import _bss,data !! 46 3:
47 .import _ebss,data !! 47 b 3b
48 48
49 load32 BOOTADDR(_bss),%r3 !! 49 END(start)
50 load32 BOOTADDR(_ebss),%r4 <<
51 ldo FRAME_SIZE(%r4),%sp /* sta <<
52 $bss_loop: <<
53 cmpb,<<,n %r3,%r4,$bss_loop <<
54 stw,ma %r0,4(%r3) <<
55 <<
56 /* Initialize the global data pointer <<
57 loadgp <<
58 <<
59 /* arg0..arg4 were set by palo. */ <<
60 copy %arg1, %r6 /* com <<
61 copy %arg2, %r7 /* rd- <<
62 copy %arg3, %r8 /* rd- <<
63 load32 BOOTADDR(decompress_kernel),%r <<
64 <<
65 #ifdef CONFIG_64BIT <<
66 .level PA_ASM_LEVEL <<
67 ssm PSW_W_SM, %r0 /* set <<
68 depdi 0, 31, 32, %r3 <<
69 #endif <<
70 load32 BOOTADDR(startup_continue), %r <<
71 bv,n 0(%r3) <<
72 <<
73 startup_continue: <<
74 #ifdef CONFIG_64BIT <<
75 .level PA_ASM_LEVEL <<
76 rsm PSW_W_SM, %r0 /* cle <<
77 #endif <<
78 <<
79 load32 KERNEL_BINARY_TEXT_START, %arg <<
80 copy %r6, %arg1 /* com <<
81 copy %r7, %arg2 /* rd- <<
82 copy %r8, %arg3 /* rd- <<
83 50
84 bv,n 0(%ret0) !! 51 .comm .heap,BOOT_HEAP_SIZE,4
85 END(startup) !! 52 .comm .stack,4096*2,4
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