225 lines
3.7 KiB
ArmAsm
225 lines
3.7 KiB
ArmAsm
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/*
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* linux/arch/m68knommu/platform/68328/head-rom.S
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* - A startup file for the MC68328
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*
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* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
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* Kenneth Albanowski <kjahds@kjahds.com>,
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* The Silver Hammer Group, Ltd.
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*
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* (c) 1995, Dionne & Associates
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* (c) 1995, DKG Display Tech.
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*/
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#define ASSEMBLY
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#define IMMED #
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#define DBG_PUTC(x) moveb IMMED x, 0xfffff907
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#include <linux/config.h>
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.global _stext
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.global _start
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.global _rambase
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.global __ramvec
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.global _ramvec
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.global _ramstart
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.global _ramend
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.global penguin_bits
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#ifdef CONFIG_PILOT
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#define IMR 0xFFFFF304
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.data
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.align 16
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penguin_bits:
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#include "bootlogo.rh"
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#endif
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/*****************************************************************************/
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.data
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/*
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* Set up the usable of RAM stuff. Size of RAM is determined then
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* an initial stack set up at the end.
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*/
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.align 4
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_ramvec:
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.long 0
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_rambase:
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.long 0
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_ramstart:
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.long 0
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_ramend:
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.long 0
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.text
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_start:
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_stext:
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#ifdef CONFIG_M68328
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#ifdef CONFIG_PILOT
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.byte 0x4e, 0xfa, 0x00, 0x0a /* Jmp +X bytes */
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.byte 'b', 'o', 'o', 't'
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.word 10000
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nop
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#endif
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moveq #0, %d0
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movew %d0, 0xfffff618 /* Watchdog off */
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movel #0x00011f07, 0xfffff114 /* CS A1 Mask */
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movew #0x0800, 0xfffff906 /* Ignore CTS */
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movew #0x010b, 0xfffff902 /* BAUD to 9600 */
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movew #0x2410, 0xfffff200 /* PLLCR */
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movew #0x123, 0xfffff202 /* PLLFSR */
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#ifdef CONFIG_PILOT
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moveb #0, 0xfffffA27 /* LCKCON */
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movel #_start, 0xfffffA00 /* LSSA */
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moveb #0xa, 0xfffffA05 /* LVPW */
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movew #0x9f, 0xFFFFFa08 /* LXMAX */
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movew #0x9f, 0xFFFFFa0a /* LYMAX */
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moveb #9, 0xfffffa29 /* LBAR */
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moveb #0, 0xfffffa25 /* LPXCD */
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moveb #0x04, 0xFFFFFa20 /* LPICF */
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moveb #0x58, 0xfffffA27 /* LCKCON */
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moveb #0x85, 0xfffff429 /* PFDATA */
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moveb #0xd8, 0xfffffA27 /* LCKCON */
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moveb #0xc5, 0xfffff429 /* PFDATA */
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moveb #0xd5, 0xfffff429 /* PFDATA */
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moveal #0x00100000, %a3
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moveal #0x100ffc00, %a4
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#endif /* CONFIG_PILOT */
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#endif /* CONFIG_M68328 */
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movew #0x2700, %sr
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lea %a4@(-4), %sp
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DBG_PUTC('\r')
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DBG_PUTC('\n')
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DBG_PUTC('A')
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moveq #0,%d0
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movew #16384, %d0 /* PLL settle wait loop */
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L0:
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subw #1, %d0
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bne L0
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DBG_PUTC('B')
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/* Copy command line from beginning of RAM (+16) to end of bss */
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movel #__ramvec, %d7
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addl #16, %d7
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moveal %d7, %a0
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moveal #_ebss, %a1
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lea %a1@(512), %a2
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DBG_PUTC('C')
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/* Copy %a0 to %a1 until %a1 == %a2 */
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L2:
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movel %a0@+, %d0
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movel %d0, %a1@+
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cmpal %a1, %a2
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bhi L2
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/* Copy data+init segment from ROM to RAM */
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moveal #_etext, %a0
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moveal #_sdata, %a1
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moveal #__init_end, %a2
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DBG_PUTC('D')
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/* Copy %a0 to %a1 until %a1 == %a2 */
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LD1:
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movel %a0@+, %d0
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movel %d0, %a1@+
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cmpal %a1, %a2
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bhi LD1
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DBG_PUTC('E')
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moveal #_sbss, %a0
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moveal #_ebss, %a1
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/* Copy 0 to %a0 until %a0 == %a1 */
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L1:
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movel #0, %a0@+
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cmpal %a0, %a1
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bhi L1
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DBG_PUTC('F')
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/* Copy command line from end of bss to command line */
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moveal #_ebss, %a0
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moveal #command_line, %a1
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lea %a1@(512), %a2
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DBG_PUTC('G')
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/* Copy %a0 to %a1 until %a1 == %a2 */
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L3:
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movel %a0@+, %d0
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movel %d0, %a1@+
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cmpal %a1, %a2
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bhi L3
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movel #_sdata, %d0
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movel %d0, _rambase
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movel #_ebss, %d0
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movel %d0, _ramstart
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movel %a4, %d0
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subl #4096, %d0 /* Reserve 4K of stack */
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moveq #79, %d7
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movel %d0, _ramend
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movel %a3, %d0
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movel %d0, rom_length
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pea 0
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pea env
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pea %sp@(4)
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pea 0
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DBG_PUTC('H')
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#ifdef CONFIG_PILOT
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movel #penguin_bits, 0xFFFFFA00
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moveb #10, 0xFFFFFA05
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movew #160, 0xFFFFFA08
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movew #160, 0xFFFFFA0A
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#endif /* CONFIG_PILOT */
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DBG_PUTC('I')
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lea init_thread_union, %a0
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lea 0x2000(%a0), %sp
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DBG_PUTC('J')
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DBG_PUTC('\r')
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DBG_PUTC('\n')
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jsr start_kernel
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_exit:
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jmp _exit
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.data
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env:
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.long 0
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