sun3-head.S
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- #include <linux/linkage.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 SYMBOL_NAME(bootup_user_stack)
- .globl SYMBOL_NAME(bootup_kernel_stack)
- .globl SYMBOL_NAME(pg0)
- .globl SYMBOL_NAME(empty_bad_page)
- .globl SYMBOL_NAME(empty_bad_page_table)
- .globl SYMBOL_NAME(empty_zero_page)
- .globl SYMBOL_NAME(swapper_pg_dir)
- .globl SYMBOL_NAME(kernel_pmd_table)
- .globl SYMBOL_NAME(availmem)
- .global SYMBOL_NAME(m68k_pgtable_cachemode)
- .global SYMBOL_NAME(kpt)
- | todo: all these should be in bss!
- SYMBOL_NAME(swapper_pg_dir): .skip 0x2000
- SYMBOL_NAME(pg0): .skip 0x2000
- SYMBOL_NAME(empty_bad_page): .skip 0x2000
- SYMBOL_NAME(empty_bad_page_table): .skip 0x2000
- SYMBOL_NAME(kernel_pmd_table): .skip 0x2000
- SYMBOL_NAME(empty_zero_page): .skip 0x2000
- .globl SYMBOL_NAME(kernel_pg_dir)
- .equ SYMBOL_NAME(kernel_pg_dir),SYMBOL_NAME(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 SYMBOL_NAME(init_task_union),%a2 | get initial thread...
- lea %a2@(KTHREAD_SIZE),%sp | ...and its stack.
- /* copy bootinfo records from the loader to _end */
- lea SYMBOL_NAME(_end), %a1
- lea BI_START, %a0
- /* number of longs to copy */
- movel %a0@, %d0
- 1: addl #4, %a0
- movel %a0@, %a1@
- addl #4, %a1
- dbf %d0, 1b
-
- /* 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 SYMBOL_NAME(sun3_init)
- jbsr SYMBOL_NAME(base_trap_init)
-
- jbsr SYMBOL_NAME(start_kernel)
- trap #15
- .data
- .even
- SYMBOL_NAME_LABEL(kpt)
- .long 0
- SYMBOL_NAME_LABEL(availmem)
- .long 0
- | todo: remove next two. --m
- SYMBOL_NAME_LABEL(is_medusa)
- .long 0
- SYMBOL_NAME_LABEL(m68k_pgtable_cachemode)
- .long 0