arch/m68k/kernel/sun3-head.S

   1 #include <linux/linkage.h>
   2 #include <linux/init.h>
   3
   4 #include <asm/entry.h>
   5 #include <asm/page.h>
   6 #include <asm/contregs.h>
   7 #include <asm/sun3-head.h>
   8
   9 PSL_HIGHIPL     = 0x2700
  10 NBSG            = 0x20000
  11 ICACHE_ONLY     = 0x00000009
  12 CACHES_OFF      = 0x00000008    | actually a clear and disable --m
  13 #define MAS_STACK INT_STACK
  14 ROOT_TABLE_SIZE = 128
  15 PAGESIZE        = 8192
  16 SUN3_INVALID_PMEG = 255
  17 .globl bootup_user_stack
  18 .globl bootup_kernel_stack
  19 .globl pg0
  20 .globl swapper_pg_dir
  21 .globl kernel_pmd_table
  22 .globl availmem
  23 .global m68k_pgtable_cachemode
  24 .global kpt
  25 | todo: all these should be in bss!
  26 swapper_pg_dir:                .skip 0x2000
  27 pg0:                           .skip 0x2000
  28 kernel_pmd_table:              .skip 0x2000
  29
  30 .globl kernel_pg_dir
  31 .equ    kernel_pg_dir,kernel_pmd_table
  32
  33         __HEAD
  34 ENTRY(_stext)
  35 ENTRY(_start)
  36
  37 /* Firstly, disable interrupts and set up function codes. */
  38         movew   #PSL_HIGHIPL, %sr
  39         moveq   #FC_CONTROL, %d0
  40         movec   %d0, %sfc
  41         movec   %d0, %dfc
  42
  43 /* Make sure we're in context zero. */
  44         moveq   #0, %d0
  45         movsb   %d0, AC_CONTEXT
  46
  47 /* map everything the bootloader left us into high memory, clean up the
  48    excess later */
  49         lea     (AC_SEGMAP+0),%a0
  50         lea     (AC_SEGMAP+KERNBASE),%a1
  51 1:
  52         movsb   %a0@, %d1
  53         movsb   %d1, %a1@
  54         cmpib   #SUN3_INVALID_PMEG, %d1
  55         beq     2f
  56         addl    #NBSG,%a0
  57         addl    #NBSG,%a1
  58         jmp     1b
  59
  60 2:
  61
  62 /* Disable caches and jump to high code. */
  63         moveq   #ICACHE_ONLY,%d0        | Cache disabled until we're ready to enable it
  64         movc    %d0, %cacr      |   is this the right value? (yes --m)
  65         jmp     1f:l
  66
  67 /* Following code executes at high addresses (0xE000xxx). */
  68 1:      lea     init_task,%curptr                       | get initial thread...
  69         lea     init_thread_union+THREAD_SIZE,%sp       | ...and its stack.
  70
  71 /* Point MSP at an invalid page to trap if it's used. --m */
  72         movl    #(PAGESIZE),%d0
  73         movc    %d0,%msp
  74         moveq   #-1,%d0
  75         movsb   %d0,(AC_SEGMAP+0x0)
  76
  77         jbsr    sun3_init
  78
  79         jbsr    base_trap_init
  80
  81         jbsr    start_kernel
  82         trap    #15
  83
  84         .data
  85         .even
  86 kpt:
  87         .long 0
  88 availmem:
  89         .long 0
  90 | todo: remove next two. --m
  91 is_medusa:
  92         .long 0
  93 m68k_pgtable_cachemode:
  94         .long 0
  95