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sun3-head.S
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#include <linux/linkage.h>
#include <linux/init.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
__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.
/* 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