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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [armnommu/] [boot/] [compressed/] [head.S] - Blame information for rev 1765

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/*
 * linux/arch/arm/boot/compressed/head.S
 *
 * Copyright (C) 1996 Russell King
 */
                .text
/*
 * sort out different calling conventions
 */
start:          teq     r0, #0
                beq     newparams
                mov     r4, #0x02000000
                add     r4, r4, #0x7C000
                mov     r3, #0x4000
                sub     r3, r3, #4
1:              ldmia   r0!, {r5 - r12}
                stmia   r4!, {r5 - r12}
                subs    r3, r3, #32
                bpl     1b
newparams:      adr     r2, LC0
                ldmia   r2, {r2, r3, r4, r5, r6, sp}
                adr     r7, start
                sub     r6, r7, r6
/*
 * Relocate pointers
 */
                add     r2, r2, r6
                add     r3, r3, r6
                add     r5, r5, r6
                add     sp, sp, r6
/*
 * Clear zero-init
 */
                mov     r6, #0
1:              str     r6, [r2], #4
                cmp     r2, r3
                blt     1b
                str     r1, [r5]                @ save architecture
/*
 * Uncompress the kernel
 */
                mov     r1, #0x8000
                add     r2, r2, r1, lsl #1      @ Add 64k for malloc
                sub     r1, r1, #1
                add     r2, r2, r1
                bic     r5, r2, r1              @ decompress kernel to after end of the compressed
                mov     r0, r5
                bl      _decompress_kernel
                add     r0, r0, #7
                bic     r2, r0, #7
/*
 * Now move the kernel to the correct location (r5 -> r4, len r0)
 */
                mov     r0, r4                  @ r0 = start of real kernel
                mov     r1, r5                  @ r1 = start of kernel image
                add     r3, r5, r2              @ r3 = end of kernel
                adr     r4, movecode
                adr     r5, movecodeend
1:              ldmia   r4!, {r6 - r12, lr}
                stmia   r3!, {r6 - r12, lr}
                cmp     r4, r5
                blt     1b
                mrc     p15, 0, r5, c0, c0
                eor     r5, r5, #0x44 << 24
                eor     r5, r5, #0x01 << 16
                eor     r5, r5, #0xa1 << 8
                movs    r5, r5, lsr #4
                mov     r5, #0
                mcreq   p15, 0, r5, c7, c5, 0   @ flush I cache
                ldr     r5, LC0 + 12            @ get architecture
                ldr     r5, [r5]
                add     pc, r1, r2              @ Call move code
 
/*
 * r0 = length, r1 = to, r2 = from
 */
movecode:       add     r3, r1, r2
                mov     r4, r0
1:              ldmia   r1!, {r6 - r12, lr}
                stmia   r0!, {r6 - r12, lr}
                cmp     r1, r3
                blt     1b
                mrc     p15, 0, r0, c0, c0
                eor     r0, r0, #0x44 << 24
                eor     r0, r0, #0x01 << 16
                eor     r0, r0, #0xa1 << 8
                movs    r0, r0, lsr #4
                mov     r0, #0
                mcreq   p15, 0, r0, c7, c5, 0   @ flush I cache
                mov     r1, r5                  @ call kernel correctly
                add     pc, r4, #0x20           @ call via EXEC entry
 
movecodeend:
LC0:            .word   __edata
                .word   __end
                .word   LOADADDR
                .word   _architecture
                .word   start
                .word   _user_stack+4096
 
                .bss
_architecture:  .word   0

Line No.	Rev	Author	Line
1	1622	jcastillo	`/*`
2			`* linux/arch/arm/boot/compressed/head.S`
3			`*`
4			`* Copyright (C) 1996 Russell King`
5			`*/`
6			`.text`
7			`/*`
8			`* sort out different calling conventions`
9			`*/`
10			`start: teq r0, #0`
11			`beq newparams`
12			`mov r4, #0x02000000`
13			`add r4, r4, #0x7C000`
14			`mov r3, #0x4000`
15			`sub r3, r3, #4`
16			`1: ldmia r0!, {r5 - r12}`
17			`stmia r4!, {r5 - r12}`
18			`subs r3, r3, #32`
19			`bpl 1b`
20			`newparams: adr r2, LC0`
21			`ldmia r2, {r2, r3, r4, r5, r6, sp}`
22			`adr r7, start`
23			`sub r6, r7, r6`
24			`/*`
25			`* Relocate pointers`
26			`*/`
27			`add r2, r2, r6`
28			`add r3, r3, r6`
29			`add r5, r5, r6`
30			`add sp, sp, r6`
31			`/*`
32			`* Clear zero-init`
33			`*/`
34			`mov r6, #0`
35			`1: str r6, [r2], #4`
36			`cmp r2, r3`
37			`blt 1b`
38			`str r1, [r5] @ save architecture`
39			`/*`
40			`* Uncompress the kernel`
41			`*/`
42			`mov r1, #0x8000`
43			`add r2, r2, r1, lsl #1 @ Add 64k for malloc`
44			`sub r1, r1, #1`
45			`add r2, r2, r1`
46			`bic r5, r2, r1 @ decompress kernel to after end of the compressed`
47			`mov r0, r5`
48			`bl _decompress_kernel`
49			`add r0, r0, #7`
50			`bic r2, r0, #7`
51			`/*`
52			`* Now move the kernel to the correct location (r5 -> r4, len r0)`
53			`*/`
54			`mov r0, r4 @ r0 = start of real kernel`
55			`mov r1, r5 @ r1 = start of kernel image`
56			`add r3, r5, r2 @ r3 = end of kernel`
57			`adr r4, movecode`
58			`adr r5, movecodeend`
59			`1: ldmia r4!, {r6 - r12, lr}`
60			`stmia r3!, {r6 - r12, lr}`
61			`cmp r4, r5`
62			`blt 1b`
63			`mrc p15, 0, r5, c0, c0`
64			`eor r5, r5, #0x44 << 24`
65			`eor r5, r5, #0x01 << 16`
66			`eor r5, r5, #0xa1 << 8`
67			`movs r5, r5, lsr #4`
68			`mov r5, #0`
69			`mcreq p15, 0, r5, c7, c5, 0 @ flush I cache`
70			`ldr r5, LC0 + 12 @ get architecture`
71			`ldr r5, [r5]`
72			`add pc, r1, r2 @ Call move code`
73
74			`/*`
75			`* r0 = length, r1 = to, r2 = from`
76			`*/`
77			`movecode: add r3, r1, r2`
78			`mov r4, r0`
79			`1: ldmia r1!, {r6 - r12, lr}`
80			`stmia r0!, {r6 - r12, lr}`
81			`cmp r1, r3`
82			`blt 1b`
83			`mrc p15, 0, r0, c0, c0`
84			`eor r0, r0, #0x44 << 24`
85			`eor r0, r0, #0x01 << 16`
86			`eor r0, r0, #0xa1 << 8`
87			`movs r0, r0, lsr #4`
88			`mov r0, #0`
89			`mcreq p15, 0, r0, c7, c5, 0 @ flush I cache`
90			`mov r1, r5 @ call kernel correctly`
91			`add pc, r4, #0x20 @ call via EXEC entry`
92
93			`movecodeend:`
94			`LC0: .word __edata`
95			`.word __end`
96			`.word LOADADDR`
97			`.word _architecture`
98			`.word start`
99			`.word _user_stack+4096`
100
101			`.bss`
102			`_architecture: .word 0`

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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [armnommu/] [boot/] [compressed/] [head.S] - Blame information for rev 1765