Eric Lee / smarc-ti-linux-kernel

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arch/m68k/kernel/sun3-head.S 1.98 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #include <linux/linkage.h>
  
  #include <asm/entry.h>
  #include <asm/page.h>
  #include <asm/contregs.h>
  #include <asm/sun3-head.h>
  
  PSL_HIGHIPL     = 0x2700
  NBSG            = 0x20000
  ICACHE_ONLY	= 0x00000009
  CACHES_OFF	= 0x00000008	| actually a clear and disable --m
  #define MAS_STACK INT_STACK
  ROOT_TABLE_SIZE = 128
  PAGESIZE	= 8192
  SUN3_INVALID_PMEG = 255
  .globl bootup_user_stack
  .globl bootup_kernel_stack
  .globl pg0
  .globl swapper_pg_dir
  .globl kernel_pmd_table
  .globl availmem
  .global m68k_pgtable_cachemode
  .global kpt
  | todo: all these should be in bss!
  swapper_pg_dir:                .skip 0x2000
  pg0:                           .skip 0x2000
  kernel_pmd_table:              .skip 0x2000
  
  .globl kernel_pg_dir
  .equ    kernel_pg_dir,kernel_pmd_table
  
  	.section .head
  ENTRY(_stext)
  ENTRY(_start)
  
  /* Firstly, disable interrupts and set up function codes. */
  	movew	#PSL_HIGHIPL, %sr
  	moveq	#FC_CONTROL, %d0
  	movec	%d0, %sfc
  	movec	%d0, %dfc
  
  /* Make sure we're in context zero. */
  	moveq	#0, %d0
  	movsb	%d0, AC_CONTEXT
  
  /* map everything the bootloader left us into high memory, clean up the
     excess later */
  	lea	(AC_SEGMAP+0),%a0
  	lea	(AC_SEGMAP+KERNBASE),%a1
  1:
  	movsb	%a0@, %d1
  	movsb	%d1, %a1@
  	cmpib	#SUN3_INVALID_PMEG, %d1
  	beq	2f
  	addl	#NBSG,%a0
  	addl	#NBSG,%a1
  	jmp	1b
  
  2:
  
  /* Disable caches and jump to high code. */
  	moveq	#ICACHE_ONLY,%d0	| Cache disabled until we're ready to enable it
  	movc	%d0, %cacr	|   is this the right value? (yes --m)
  	jmp	1f:l
  
  /* Following code executes at high addresses (0xE000xxx). */
  1:	lea	init_task,%curptr			| get initial thread...
  	lea	init_thread_union+THREAD_SIZE,%sp	| ...and its stack.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /* Point MSP at an invalid page to trap if it's used. --m */
  	movl	#(PAGESIZE),%d0
  	movc	%d0,%msp
  	moveq	#-1,%d0
  	movsb	%d0,(AC_SEGMAP+0x0)
  
  	jbsr	sun3_init
  
  	jbsr	base_trap_init
  
          jbsr    start_kernel
  	trap	#15
  
          .data
          .even
  kpt:
          .long 0
  availmem:
          .long 0
  | todo: remove next two. --m
  is_medusa:
          .long 0
  m68k_pgtable_cachemode:
          .long 0