projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #include <linux/config.h> |
| 2 | ||
| 3 | .global __main | |
| 4 | .global __ram_start | |
| 5 | .global __ram_end | |
| 6 | .global __rom_start | |
| 7 | .global __rom_end | |
| 8 | ||
| 9 | .global _rambase | |
| 10 | .global _ramstart | |
| 11 | ||
| 12 | .global splash_bits | |
| 13 | .global _start | |
| 14 | .global _stext | |
| 15 | ||
| 16 | #define DEBUG | |
| 17 | #define ROM_OFFSET 0x10C00000 | |
| 18 | #define STACK_GAURD 0x10 | |
| 19 | ||
| 20 | .text | |
| 21 | ||
| 22 | _start: | |
| 23 | _stext: | |
| 24 | movew #0x2700, %sr /* Exceptions off! */ | |
| 25 | ||
| 26 | #if 0 | |
| 27 | /* Init chip registers. uCsimm specific */ | |
| 28 | moveb #0x00, 0xfffffb0b /* Watchdog off */ | |
| 29 | moveb #0x10, 0xfffff000 /* SCR */ | |
| 30 | ||
| 31 | movew #0x2400, 0xfffff200 /* PLLCR */ | |
| 32 | movew #0x0123, 0xfffff202 /* PLLFSR */ | |
| 33 | ||
| 34 | moveb #0x00, 0xfffff40b /* enable chip select */ | |
| 35 | moveb #0x00, 0xfffff423 /* enable /DWE */ | |
| 36 | moveb #0x08, 0xfffffd0d /* disable hardmap */ | |
| 37 | moveb #0x07, 0xfffffd0e /* level 7 interrupt clear */ | |
| 38 | ||
| 39 | movew #0x8600, 0xfffff100 /* FLASH at 0x10c00000 */ | |
| 40 | movew #0x018b, 0xfffff110 /* 2Meg, enable, 0ws */ | |
| 41 | ||
| 42 | movew #0x8f00, 0xfffffc00 /* DRAM configuration */ | |
| 43 | movew #0x9667, 0xfffffc02 /* DRAM control */ | |
| 44 | movew #0x0000, 0xfffff106 /* DRAM at 0x00000000 */ | |
| 45 | movew #0x068f, 0xfffff116 /* 8Meg, enable, 0ws */ | |
| 46 | ||
| 47 | moveb #0x40, 0xfffff300 /* IVR */ | |
| 48 | movel #0x007FFFFF, %d0 /* IMR */ | |
| 49 | movel %d0, 0xfffff304 | |
| 50 | ||
| 51 | moveb 0xfffff42b, %d0 | |
| 52 | andb #0xe0, %d0 | |
| 53 | moveb %d0, 0xfffff42b | |
| 54 | ||
| 55 | moveb #0x08, 0xfffff907 /* Ignore CTS */ | |
| 56 | movew #0x010b, 0xfffff902 /* BAUD to 9600 */ | |
| 57 | movew #0xe100, 0xfffff900 /* enable */ | |
| 58 | #endif | |
| 59 | ||
| 60 | movew #16384, %d0 /* PLL settle wait loop */ | |
| 61 | L0: | |
| 62 | subw #1, %d0 | |
| 63 | bne L0 | |
| 64 | #ifdef DEBUG | |
| 65 | moveq #70, %d7 /* 'F' */ | |
| 66 | moveb %d7,0xfffff907 /* No absolute addresses */ | |
| 67 | pclp1: | |
| 68 | movew 0xfffff906, %d7 | |
| 69 | andw #0x2000, %d7 | |
| 70 | beq pclp1 | |
| 71 | #endif /* DEBUG */ | |
| 72 | ||
| 73 | #ifdef CONFIG_RELOCATE | |
| 74 | /* Copy me to RAM */ | |
| 75 | moveal #__rom_start, %a0 | |
| 76 | moveal #__ram_start, %a1 | |
| 77 | moveal #_edata, %a2 | |
| 78 | ||
| 79 | /* Copy %a0 to %a1 until %a1 == %a2 */ | |
| 80 | LD1: | |
| 81 | movel %a0@+, %d0 | |
| 82 | movel %d0, %a1@+ | |
| 83 | cmpal %a1, %a2 | |
| 84 | bhi LD1 | |
| 85 | ||
| 86 | #ifdef DEBUG | |
| 87 | moveq #74, %d7 /* 'J' */ | |
| 88 | moveb %d7,0xfffff907 /* No absolute addresses */ | |
| 89 | pclp2: | |
| 90 | movew 0xfffff906, %d7 | |
| 91 | andw #0x2000, %d7 | |
| 92 | beq pclp2 | |
| 93 | #endif /* DEBUG */ | |
| 94 | /* jump into the RAM copy */ | |
| 95 | jmp ram_jump | |
| 96 | ram_jump: | |
| 97 | ||
| 98 | #endif /* CONFIG_RELOCATE */ | |
| 99 | ||
| 100 | #ifdef DEBUG | |
| 101 | moveq #82, %d7 /* 'R' */ | |
| 102 | moveb %d7,0xfffff907 /* No absolute addresses */ | |
| 103 | pclp3: | |
| 104 | movew 0xfffff906, %d7 | |
| 105 | andw #0x2000, %d7 | |
| 106 | beq pclp3 | |
| 107 | #endif /* DEBUG */ | |
| 108 | moveal #0x007ffff0, %ssp | |
| 109 | moveal #_sbss, %a0 | |
| 110 | moveal #_ebss, %a1 | |
| 111 | ||
| 112 | /* Copy 0 to %a0 until %a0 >= %a1 */ | |
| 113 | L1: | |
| 114 | movel #0, %a0@+ | |
| 115 | cmpal %a0, %a1 | |
| 116 | bhi L1 | |
| 117 | ||
| 118 | #ifdef DEBUG | |
| 119 | moveq #67, %d7 /* 'C' */ | |
| 120 | jsr putc | |
| 121 | #endif /* DEBUG */ | |
| 122 | ||
| 123 | pea 0 | |
| 124 | pea env | |
| 125 | pea %sp@(4) | |
| 126 | pea 0 | |
| 127 | ||
| 128 | #ifdef DEBUG | |
| 129 | moveq #70, %d7 /* 'F' */ | |
| 130 | jsr putc | |
| 131 | #endif /* DEBUG */ | |
| 132 | ||
| 133 | lp: | |
| 134 | jsr start_kernel | |
| 135 | jmp lp | |
| 136 | _exit: | |
| 137 | ||
| 138 | jmp _exit | |
| 139 | ||
| 140 | __main: | |
| 141 | /* nothing */ | |
| 142 | rts | |
| 143 | ||
| 144 | #ifdef DEBUG | |
| 145 | putc: | |
| 146 | moveb %d7,0xfffff907 | |
| 147 | pclp: | |
| 148 | movew 0xfffff906, %d7 | |
| 149 | andw #0x2000, %d7 | |
| 150 | beq pclp | |
| 151 | rts | |
| 152 | #endif /* DEBUG */ | |
| 153 | ||
| 154 | .data | |
| 155 | ||
| 156 | /* | |
| 157 | * Set up the usable of RAM stuff. Size of RAM is determined then | |
| 158 | * an initial stack set up at the end. | |
| 159 | */ | |
| 160 | .align 4 | |
| 161 | _ramvec: | |
| 162 | .long 0 | |
| 163 | _rambase: | |
| 164 | .long 0 | |
| 165 | _ramstart: | |
| 166 | .long 0 | |
| 167 | _ramend: | |
| 168 | .long 0 | |
| 169 | ||
| 170 | env: | |
| 171 | .long 0 |