diff options
Diffstat (limited to 'arch/m68k/kernel/sun3-head.S')
| -rw-r--r-- | arch/m68k/kernel/sun3-head.S | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/m68k/kernel/sun3-head.S b/arch/m68k/kernel/sun3-head.S new file mode 100644 index 000000000..faf18f4fa --- /dev/null +++ b/arch/m68k/kernel/sun3-head.S @@ -0,0 +1,96 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#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 + |