| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|
| 2 | #include <linux/linkage.h> |
|---|
| 3 | #include <linux/init.h> |
|---|
| 4 | |
|---|
| 5 | #include <asm/entry.h> |
|---|
| 6 | #include <asm/page.h> |
|---|
| 7 | #include <asm/contregs.h> |
|---|
| 8 | #include <asm/sun3-head.h> |
|---|
| 9 | |
|---|
| 10 | PSL_HIGHIPL = 0x2700 |
|---|
| 11 | NBSG = 0x20000 |
|---|
| 12 | ICACHE_ONLY = 0x00000009 |
|---|
| 13 | CACHES_OFF = 0x00000008 | actually a clear and disable --m |
|---|
| 14 | #define MAS_STACK INT_STACK |
|---|
| 15 | ROOT_TABLE_SIZE = 128 |
|---|
| 16 | PAGESIZE = 8192 |
|---|
| 17 | SUN3_INVALID_PMEG = 255 |
|---|
| 18 | .globl bootup_user_stack |
|---|
| 19 | .globl bootup_kernel_stack |
|---|
| 20 | .globl pg0 |
|---|
| 21 | .globl swapper_pg_dir |
|---|
| 22 | .globl kernel_pmd_table |
|---|
| 23 | .globl availmem |
|---|
| 24 | .global m68k_pgtable_cachemode |
|---|
| 25 | .global kpt |
|---|
| 26 | | todo: all these should be in bss! |
|---|
| 27 | swapper_pg_dir: .skip 0x2000 |
|---|
| 28 | pg0: .skip 0x2000 |
|---|
| 29 | kernel_pmd_table: .skip 0x2000 |
|---|
| 30 | |
|---|
| 31 | .globl kernel_pg_dir |
|---|
| 32 | .equ kernel_pg_dir,kernel_pmd_table |
|---|
| 33 | |
|---|
| 34 | __HEAD |
|---|
| 35 | ENTRY(_stext) |
|---|
| 36 | ENTRY(_start) |
|---|
| 37 | |
|---|
| 38 | /* Firstly, disable interrupts and set up function codes. */ |
|---|
| 39 | movew #PSL_HIGHIPL, %sr |
|---|
| 40 | moveq #FC_CONTROL, %d0 |
|---|
| 41 | movec %d0, %sfc |
|---|
| 42 | movec %d0, %dfc |
|---|
| 43 | |
|---|
| 44 | /* Make sure we're in context zero. */ |
|---|
| 45 | moveq #0, %d0 |
|---|
| 46 | movsb %d0, AC_CONTEXT |
|---|
| 47 | |
|---|
| 48 | /* map everything the bootloader left us into high memory, clean up the |
|---|
| 49 | excess later */ |
|---|
| 50 | lea (AC_SEGMAP+0),%a0 |
|---|
| 51 | lea (AC_SEGMAP+KERNBASE),%a1 |
|---|
| 52 | 1: |
|---|
| 53 | movsb %a0@, %d1 |
|---|
| 54 | movsb %d1, %a1@ |
|---|
| 55 | cmpib #SUN3_INVALID_PMEG, %d1 |
|---|
| 56 | beq 2f |
|---|
| 57 | addl #NBSG,%a0 |
|---|
| 58 | addl #NBSG,%a1 |
|---|
| 59 | jmp 1b |
|---|
| 60 | |
|---|
| 61 | 2: |
|---|
| 62 | |
|---|
| 63 | /* Disable caches and jump to high code. */ |
|---|
| 64 | moveq #ICACHE_ONLY,%d0 | Cache disabled until we're ready to enable it |
|---|
| 65 | movc %d0, %cacr | is this the right value? (yes --m) |
|---|
| 66 | jmp 1f:l |
|---|
| 67 | |
|---|
| 68 | /* Following code executes at high addresses (0xE000xxx). */ |
|---|
| 69 | 1: lea init_task,%curptr | get initial thread... |
|---|
| 70 | lea init_thread_union+THREAD_SIZE,%sp | ...and its stack. |
|---|
| 71 | |
|---|
| 72 | /* Point MSP at an invalid page to trap if it's used. --m */ |
|---|
| 73 | movl #(PAGESIZE),%d0 |
|---|
| 74 | movc %d0,%msp |
|---|
| 75 | moveq #-1,%d0 |
|---|
| 76 | movsb %d0,(AC_SEGMAP+0x0) |
|---|
| 77 | |
|---|
| 78 | jbsr sun3_init |
|---|
| 79 | |
|---|
| 80 | jbsr base_trap_init |
|---|
| 81 | |
|---|
| 82 | jbsr start_kernel |
|---|
| 83 | trap #15 |
|---|
| 84 | |
|---|
| 85 | .data |
|---|
| 86 | .even |
|---|
| 87 | kpt: |
|---|
| 88 | .long 0 |
|---|
| 89 | availmem: |
|---|
| 90 | .long 0 |
|---|
| 91 | |
|---|
