1#include <linux/linkage.h> 2 3#include <asm/entry.h> 4#include <asm/page.h> 5#include <asm/contregs.h> 6#include <asm/sun3-head.h> 7 8PSL_HIGHIPL = 0x2700 9NBSG = 0x20000 10ICACHE_ONLY = 0x00000009 11CACHES_OFF = 0x00000008 | actually a clear and disable --m 12#define MAS_STACK INT_STACK 13ROOT_TABLE_SIZE = 128 14PAGESIZE = 8192 15SUN3_INVALID_PMEG = 255 16.globl bootup_user_stack 17.globl bootup_kernel_stack 18.globl pg0 19.globl swapper_pg_dir 20.globl kernel_pmd_table 21.globl availmem 22.global m68k_pgtable_cachemode 23.global kpt 24| todo: all these should be in bss! 25swapper_pg_dir: .skip 0x2000 26pg0: .skip 0x2000 27kernel_pmd_table: .skip 0x2000 28 29.globl kernel_pg_dir 30.equ kernel_pg_dir,kernel_pmd_table 31 32 .section .head 33ENTRY(_stext) 34ENTRY(_start) 35 36/* Firstly, disable interrupts and set up function codes. */ 37 movew #PSL_HIGHIPL, %sr 38 moveq #FC_CONTROL, %d0 39 movec %d0, %sfc 40 movec %d0, %dfc 41 42/* Make sure we're in context zero. */ 43 moveq #0, %d0 44 movsb %d0, AC_CONTEXT 45 46/* map everything the bootloader left us into high memory, clean up the 47 excess later */ 48 lea (AC_SEGMAP+0),%a0 49 lea (AC_SEGMAP+KERNBASE),%a1 501: 51 movsb %a0@, %d1 52 movsb %d1, %a1@ 53 cmpib #SUN3_INVALID_PMEG, %d1 54 beq 2f 55 addl #NBSG,%a0 56 addl #NBSG,%a1 57 jmp 1b 58 592: 60 61/* Disable caches and jump to high code. */ 62 moveq #ICACHE_ONLY,%d0 | Cache disabled until we're ready to enable it 63 movc %d0, %cacr | is this the right value? (yes --m) 64 jmp 1f:l 65 66/* Following code executes at high addresses (0xE000xxx). */ 671: lea init_task,%curptr | get initial thread... 68 lea init_thread_union+THREAD_SIZE,%sp | ...and its stack. 69 70/* copy bootinfo records from the loader to _end */ 71 lea _end, %a1 72 lea BI_START, %a0 73 /* number of longs to copy */ 74 movel %a0@, %d0 751: addl #4, %a0 76 movel %a0@, %a1@ 77 addl #4, %a1 78 dbf %d0, 1b 79 80/* Point MSP at an invalid page to trap if it's used. --m */ 81 movl #(PAGESIZE),%d0 82 movc %d0,%msp 83 moveq #-1,%d0 84 movsb %d0,(AC_SEGMAP+0x0) 85 86 jbsr sun3_init 87 88 jbsr base_trap_init 89 90 jbsr start_kernel 91 trap #15 92 93 .data 94 .even 95kpt: 96 .long 0 97availmem: 98 .long 0 99| todo: remove next two. --m 100is_medusa: 101 .long 0 102m68k_pgtable_cachemode: 103 .long 0 104 105