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- .global __main
- .global __rom_start
- .global _rambase
- .global _ramstart
-
- .global splash_bits
- .global _start
- .global _stext
- .global _edata
- #define DEBUG
- #define ROM_OFFSET 0x10C00000
- #define STACK_GAURD 0x10
- .text
-
- _start:
- _stext:
- movew #0x2700, %sr /* Exceptions off! */
- #if 0
- /* Init chip registers. uCsimm specific */
- moveb #0x00, 0xfffffb0b /* Watchdog off */
- moveb #0x10, 0xfffff000 /* SCR */
- movew #0x2400, 0xfffff200 /* PLLCR */
- movew #0x0123, 0xfffff202 /* PLLFSR */
- moveb #0x00, 0xfffff40b /* enable chip select */
- moveb #0x00, 0xfffff423 /* enable /DWE */
- moveb #0x08, 0xfffffd0d /* disable hardmap */
- moveb #0x07, 0xfffffd0e /* level 7 interrupt clear */
- movew #0x8600, 0xfffff100 /* FLASH at 0x10c00000 */
- movew #0x018b, 0xfffff110 /* 2Meg, enable, 0ws */
- movew #0x8f00, 0xfffffc00 /* DRAM configuration */
- movew #0x9667, 0xfffffc02 /* DRAM control */
- movew #0x0000, 0xfffff106 /* DRAM at 0x00000000 */
- movew #0x068f, 0xfffff116 /* 8Meg, enable, 0ws */
- moveb #0x40, 0xfffff300 /* IVR */
- movel #0x007FFFFF, %d0 /* IMR */
- movel %d0, 0xfffff304
- moveb 0xfffff42b, %d0
- andb #0xe0, %d0
- moveb %d0, 0xfffff42b
- moveb #0x08, 0xfffff907 /* Ignore CTS */
- movew #0x010b, 0xfffff902 /* BAUD to 9600 */
- movew #0xe100, 0xfffff900 /* enable */
- #endif
- movew #16384, %d0 /* PLL settle wait loop */
- L0:
- subw #1, %d0
- bne L0
- #ifdef DEBUG
- moveq #70, %d7 /* 'F' */
- moveb %d7,0xfffff907 /* No absolute addresses */
- pclp1:
- movew 0xfffff906, %d7
- andw #0x2000, %d7
- beq pclp1
- #endif /* DEBUG */
- #ifdef CONFIG_RELOCATE
- /* Copy me to RAM */
- moveal #__rom_start, %a0
- moveal #_stext, %a1
- moveal #_edata, %a2
- /* Copy %a0 to %a1 until %a1 == %a2 */
- LD1:
- movel %a0@+, %d0
- movel %d0, %a1@+
- cmpal %a1, %a2
- bhi LD1
-
- #ifdef DEBUG
- moveq #74, %d7 /* 'J' */
- moveb %d7,0xfffff907 /* No absolute addresses */
- pclp2:
- movew 0xfffff906, %d7
- andw #0x2000, %d7
- beq pclp2
- #endif /* DEBUG */
- /* jump into the RAM copy */
- jmp ram_jump
- ram_jump:
- #endif /* CONFIG_RELOCATE */
- #ifdef DEBUG
- moveq #82, %d7 /* 'R' */
- moveb %d7,0xfffff907 /* No absolute addresses */
- pclp3:
- movew 0xfffff906, %d7
- andw #0x2000, %d7
- beq pclp3
- #endif /* DEBUG */
- moveal #0x007ffff0, %ssp
- moveal #_sbss, %a0
- moveal #_ebss, %a1
- /* Copy 0 to %a0 until %a0 >= %a1 */
- L1:
- movel #0, %a0@+
- cmpal %a0, %a1
- bhi L1
- #ifdef DEBUG
- moveq #67, %d7 /* 'C' */
- jsr putc
- #endif /* DEBUG */
- pea 0
- pea env
- pea %sp@(4)
- pea 0
- #ifdef DEBUG
- moveq #70, %d7 /* 'F' */
- jsr putc
- #endif /* DEBUG */
- lp:
- jsr start_kernel
- jmp lp
- _exit:
- jmp _exit
- __main:
- /* nothing */
- rts
- #ifdef DEBUG
- putc:
- moveb %d7,0xfffff907
- pclp:
- movew 0xfffff906, %d7
- andw #0x2000, %d7
- beq pclp
- rts
- #endif /* DEBUG */
- .data
- /*
- * Set up the usable of RAM stuff. Size of RAM is determined then
- * an initial stack set up at the end.
- */
- .align 4
- _ramvec:
- .long 0
- _rambase:
- .long 0
- _ramstart:
- .long 0
- _ramend:
- .long 0
- env:
- .long 0
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