1 /*
2 * Startup glue code to uncompress the kernel
3 *
4 * (C) 2017 Helge Deller <deller@gmx.de>
5 */
6
7 #include <linux/init.h>
8 #include <linux/linkage.h>
9 #include <asm/asm-offsets.h>
10 #include <asm/page.h>
11 #include <asm/psw.h>
12 #include <asm/pdc.h>
13 #include <asm/assembly.h>
14 #include "sizes.h"
15
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
44 /* Clear BSS */
45
46 .import _bss,data
47 .import _ebss,data
48
49 load32 BOOTADDR(_bss),%r3
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
84 bv,n 0(%ret0)
85 END(startup)
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