| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/m32r/boot/compressed/head.S |
| 3 | * |
| 4 | * Copyright (c) 2001-2003 Hiroyuki Kondo, Hirokazu Takata, |
| 5 | * Hitoshi Yamamoto, Takeo Takahashi |
| 6 | * Copyright (c) 2004 Hirokazu Takata |
| 7 | */ |
| 8 | |
| 9 | .text |
| 10 | #include <linux/config.h> |
| 11 | #include <linux/linkage.h> |
| 12 | #include <asm/addrspace.h> |
| 13 | #include <asm/page.h> |
| 14 | #include <asm/assembler.h> |
| 15 | |
| 16 | /* |
| 17 | * This code can be loaded anywhere, as long as output will not |
| 18 | * overlap it. |
| 19 | * |
| 20 | * NOTE: This head.S should *NOT* be compiled with -fpic. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | .global startup |
| 25 | .global __bss_start, _ebss, end, zimage_data, zimage_len |
| 26 | __ALIGN |
| 27 | startup: |
| 28 | ldi r0, #0x0000 /* SPI, disable EI */ |
| 29 | mvtc r0, psw |
| 30 | |
| 31 | ldi r12, #-8 |
| 32 | bl 1f |
| 33 | .fillinsn |
| 34 | 1: |
| 35 | seth r1, #high(CONFIG_MEMORY_START + 0x00400000) /* Start address */ |
| 36 | add r12, r14 /* Real address */ |
| 37 | sub r12, r1 /* difference */ |
| 38 | |
| 39 | .global got_len |
| 40 | seth r3, #high(_GLOBAL_OFFSET_TABLE_+8) |
| 41 | or3 r3, r3, #low(_GLOBAL_OFFSET_TABLE_+12) |
| 42 | add r3, r14 |
| 43 | |
| 44 | /* Update the contents of global offset table */ |
| 45 | ldi r1, #low(got_len) |
| 46 | srli r1, #2 |
| 47 | beqz r1, 2f |
| 48 | .fillinsn |
| 49 | 1: |
| 50 | ld r2, @r3 |
| 51 | add r2, r12 |
| 52 | st r2, @r3 |
| 53 | addi r3, #4 |
| 54 | addi r1, #-1 |
| 55 | bnez r1, 1b |
| 56 | .fillinsn |
| 57 | 2: |
| 58 | /* XXX: resolve plt */ |
| 59 | |
| 60 | /* |
| 61 | * Clear BSS first so that there are no surprises... |
| 62 | */ |
| 63 | #ifdef CONFIG_ISA_DUAL_ISSUE |
| 64 | seth r2, #high(__bss_start) |
| 65 | or3 r2, r2, #low(__bss_start) |
| 66 | add r2, r12 |
| 67 | seth r3, #high(_ebss) |
| 68 | or3 r3, r3, #low(_ebss) |
| 69 | add r3, r12 |
| 70 | sub r3, r2 |
| 71 | |
| 72 | ; R4 = BSS size in longwords (rounded down) |
| 73 | mv r4, r3 || ldi r1, #0 |
| 74 | srli r4, #4 || addi r2, #-4 |
| 75 | beqz r4, .Lendloop1 |
| 76 | .Lloop1: |
| 77 | #ifndef CONFIG_CHIP_M32310 |
| 78 | ; Touch memory for the no-write-allocating cache. |
| 79 | ld r0, @(4,r2) |
| 80 | #endif |
| 81 | st r1, @+r2 || addi r4, #-1 |
| 82 | st r1, @+r2 |
| 83 | st r1, @+r2 |
| 84 | st r1, @+r2 || cmpeq r1, r4 ; R4 = 0? |
| 85 | bnc .Lloop1 |
| 86 | .Lendloop1: |
| 87 | and3 r4, r3, #15 |
| 88 | addi r2, #4 |
| 89 | beqz r4, .Lendloop2 |
| 90 | .Lloop2: |
| 91 | stb r1, @r2 || addi r4, #-1 |
| 92 | addi r2, #1 |
| 93 | bnez r4, .Lloop2 |
| 94 | .Lendloop2: |
| 95 | |
| 96 | #else /* not CONFIG_ISA_DUAL_ISSUE */ |
| 97 | seth r2, #high(__bss_start) |
| 98 | or3 r2, r2, #low(__bss_start) |
| 99 | add r2, r12 |
| 100 | seth r3, #high(_ebss) |
| 101 | or3 r3, r3, #low(_ebss) |
| 102 | add r3, r12 |
| 103 | sub r3, r2 |
| 104 | mv r4, r3 |
| 105 | srli r4, #2 ; R4 = BSS size in longwords (rounded down) |
| 106 | ldi r1, #0 ; clear R1 for longwords store |
| 107 | addi r2, #-4 ; account for pre-inc store |
| 108 | beqz r4, .Lendloop1 ; any more to go? |
| 109 | .Lloop1: |
| 110 | st r1, @+r2 ; yep, zero out another longword |
| 111 | addi r4, #-1 ; decrement count |
| 112 | bnez r4, .Lloop1 ; go do some more |
| 113 | .Lendloop1: |
| 114 | |
| 115 | #endif /* not CONFIG_ISA_DUAL_ISSUE */ |
| 116 | |
| 117 | seth r1, #high(end) |
| 118 | or3 r1, r1, #low(end) |
| 119 | add r1, r12 |
| 120 | mv sp, r1 |
| 121 | |
| 122 | /* |
| 123 | * decompress the kernel |
| 124 | */ |
| 125 | mv r0, sp |
| 126 | srli r0, 31 /* MMU is ON or OFF */ |
| 127 | seth r1, #high(zimage_data) |
| 128 | or3 r1, r1, #low(zimage_data) |
| 129 | add r1, r12 |
| 130 | seth r2, #high(zimage_len) |
| 131 | or3 r2, r2, #low(zimage_len) |
| 132 | mv r3, sp |
| 133 | |
| 134 | bl decompress_kernel |
| 135 | |
| 136 | #if defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_VDEC2) |
| 137 | /* Cache flush */ |
| 138 | ldi r0, -1 |
| 139 | ldi r1, 0xd0 ; invalidate i-cache, copy back d-cache |
| 140 | stb r1, @r0 |
| 141 | #elif defined(CONFIG_CHIP_M32102) |
| 142 | /* Cache flush */ |
| 143 | ldi r0, -2 |
| 144 | ldi r1, 0x0100 ; invalidate |
| 145 | stb r1, @r0 |
| 146 | #else |
| 147 | #error "put your cache flush function, please" |
| 148 | #endif |
| 149 | |
| 150 | mv r0, sp |
| 151 | srli r0, 31 /* MMU is ON or OFF */ |
| 152 | slli r0, 31 |
| 153 | or3 r0, r0, #0x2000 |
| 154 | seth r1, #high(CONFIG_MEMORY_START) |
| 155 | or r0, r1 |
| 156 | jmp r0 |
| 157 | |
| 158 | .balign 512 |
| 159 | fake_headers_as_bzImage: |
| 160 | .short 0 |
| 161 | .ascii "HdrS" |
| 162 | .short 0x0202 |
| 163 | .short 0 |
| 164 | .short 0 |
| 165 | .byte 0x00, 0x10 |
| 166 | .short 0 |
| 167 | .byte 0 |
| 168 | .byte 1 |
| 169 | .byte 0x00, 0x80 |
| 170 | .long 0 |
| 171 | .long 0 |
| 172 | |