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 9PSL_HIGHIPL = 0x2700 10NBSG = 0x20000 11ICACHE_ONLY = 0x00000009 12CACHES_OFF = 0x00000008 | actually a clear and disable --m 13#define MAS_STACK INT_STACK 14ROOT_TABLE_SIZE = 128 15PAGESIZE = 8192 16SUN3_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! 26swapper_pg_dir: .skip 0x2000 27pg0: .skip 0x2000 28kernel_pmd_table: .skip 0x2000 29 30.globl kernel_pg_dir 31.equ kernel_pg_dir,kernel_pmd_table 32 33 __HEAD 34ENTRY(_stext) 35ENTRY(_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 511: 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 59 602: 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). */ 681: 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 86kpt: 87 .long 0 88availmem: 89 .long 0 90| todo: remove next two. --m 91is_medusa: 92 .long 0 93m68k_pgtable_cachemode: 94 .long 0 95 96