1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
222 lines
5.4 KiB
ArmAsm
222 lines
5.4 KiB
ArmAsm
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1994, 1995 Waldorf Electronics
|
|
* Written by Ralf Baechle and Andreas Busse
|
|
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 Ralf Baechle
|
|
* Copyright (C) 1996 Paul M. Antoine
|
|
* Modified for DECStation and hence R3000 support by Paul M. Antoine
|
|
* Further modifications by David S. Miller and Harald Koerfgen
|
|
* Copyright (C) 1999 Silicon Graphics, Inc.
|
|
* Kevin Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
#include <linux/threads.h>
|
|
|
|
#include <asm/asm.h>
|
|
#include <asm/regdef.h>
|
|
#include <asm/page.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/stackframe.h>
|
|
#ifdef CONFIG_SGI_IP27
|
|
#include <asm/sn/addrs.h>
|
|
#include <asm/sn/sn0/hubni.h>
|
|
#include <asm/sn/klkernvars.h>
|
|
#endif
|
|
|
|
.macro ARC64_TWIDDLE_PC
|
|
#if defined(CONFIG_ARC64) || defined(CONFIG_MAPPED_KERNEL)
|
|
/* We get launched at a XKPHYS address but the kernel is linked to
|
|
run at a KSEG0 address, so jump there. */
|
|
PTR_LA t0, \@f
|
|
jr t0
|
|
\@:
|
|
#endif
|
|
.endm
|
|
|
|
#ifdef CONFIG_SGI_IP27
|
|
/*
|
|
* outputs the local nasid into res. IP27 stuff.
|
|
*/
|
|
.macro GET_NASID_ASM res
|
|
dli \res, LOCAL_HUB_ADDR(NI_STATUS_REV_ID)
|
|
ld \res, (\res)
|
|
and \res, NSRI_NODEID_MASK
|
|
dsrl \res, NSRI_NODEID_SHFT
|
|
.endm
|
|
#endif /* CONFIG_SGI_IP27 */
|
|
|
|
/*
|
|
* inputs are the text nasid in t1, data nasid in t2.
|
|
*/
|
|
.macro MAPPED_KERNEL_SETUP_TLB
|
|
#ifdef CONFIG_MAPPED_KERNEL
|
|
/*
|
|
* This needs to read the nasid - assume 0 for now.
|
|
* Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0,
|
|
* 0+DVG in tlblo_1.
|
|
*/
|
|
dli t0, 0xffffffffc0000000
|
|
dmtc0 t0, CP0_ENTRYHI
|
|
li t0, 0x1c000 # Offset of text into node memory
|
|
dsll t1, NASID_SHFT # Shift text nasid into place
|
|
dsll t2, NASID_SHFT # Same for data nasid
|
|
or t1, t1, t0 # Physical load address of kernel text
|
|
or t2, t2, t0 # Physical load address of kernel data
|
|
dsrl t1, 12 # 4K pfn
|
|
dsrl t2, 12 # 4K pfn
|
|
dsll t1, 6 # Get pfn into place
|
|
dsll t2, 6 # Get pfn into place
|
|
li t0, ((_PAGE_GLOBAL|_PAGE_VALID| _CACHE_CACHABLE_COW) >> 6)
|
|
or t0, t0, t1
|
|
mtc0 t0, CP0_ENTRYLO0 # physaddr, VG, cach exlwr
|
|
li t0, ((_PAGE_GLOBAL|_PAGE_VALID| _PAGE_DIRTY|_CACHE_CACHABLE_COW) >> 6)
|
|
or t0, t0, t2
|
|
mtc0 t0, CP0_ENTRYLO1 # physaddr, DVG, cach exlwr
|
|
li t0, 0x1ffe000 # MAPPED_KERN_TLBMASK, TLBPGMASK_16M
|
|
mtc0 t0, CP0_PAGEMASK
|
|
li t0, 0 # KMAP_INX
|
|
mtc0 t0, CP0_INDEX
|
|
li t0, 1
|
|
mtc0 t0, CP0_WIRED
|
|
tlbwi
|
|
#else
|
|
mtc0 zero, CP0_WIRED
|
|
#endif
|
|
.endm
|
|
|
|
/*
|
|
* For the moment disable interrupts, mark the kernel mode and
|
|
* set ST0_KX so that the CPU does not spit fire when using
|
|
* 64-bit addresses. A full initialization of the CPU's status
|
|
* register is done later in per_cpu_trap_init().
|
|
*/
|
|
.macro setup_c0_status set clr
|
|
.set push
|
|
mfc0 t0, CP0_STATUS
|
|
or t0, ST0_CU0|\set|0x1f|\clr
|
|
xor t0, 0x1f|\clr
|
|
mtc0 t0, CP0_STATUS
|
|
.set noreorder
|
|
sll zero,3 # ehb
|
|
.set pop
|
|
.endm
|
|
|
|
.macro setup_c0_status_pri
|
|
#ifdef CONFIG_MIPS64
|
|
setup_c0_status ST0_KX 0
|
|
#else
|
|
setup_c0_status 0 0
|
|
#endif
|
|
.endm
|
|
|
|
.macro setup_c0_status_sec
|
|
#ifdef CONFIG_MIPS64
|
|
setup_c0_status ST0_KX ST0_BEV
|
|
#else
|
|
setup_c0_status 0 ST0_BEV
|
|
#endif
|
|
.endm
|
|
|
|
/*
|
|
* Reserved space for exception handlers.
|
|
* Necessary for machines which link their kernels at KSEG0.
|
|
*/
|
|
.fill 0x400
|
|
|
|
EXPORT(stext) # used for profiling
|
|
EXPORT(_stext)
|
|
|
|
__INIT
|
|
|
|
NESTED(kernel_entry, 16, sp) # kernel entry point
|
|
setup_c0_status_pri
|
|
|
|
#ifdef CONFIG_SGI_IP27
|
|
GET_NASID_ASM t1
|
|
move t2, t1 # text and data are here
|
|
MAPPED_KERNEL_SETUP_TLB
|
|
#endif /* IP27 */
|
|
|
|
ARC64_TWIDDLE_PC
|
|
|
|
PTR_LA t0, __bss_start # clear .bss
|
|
LONG_S zero, (t0)
|
|
PTR_LA t1, __bss_stop - LONGSIZE
|
|
1:
|
|
PTR_ADDIU t0, LONGSIZE
|
|
LONG_S zero, (t0)
|
|
bne t0, t1, 1b
|
|
|
|
LONG_S a0, fw_arg0 # firmware arguments
|
|
LONG_S a1, fw_arg1
|
|
LONG_S a2, fw_arg2
|
|
LONG_S a3, fw_arg3
|
|
|
|
PTR_LA $28, init_thread_union
|
|
PTR_ADDIU sp, $28, _THREAD_SIZE - 32
|
|
set_saved_sp sp, t0, t1
|
|
PTR_SUBU sp, 4 * SZREG # init stack pointer
|
|
|
|
j start_kernel
|
|
END(kernel_entry)
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* SMP slave cpus entry point. Board specific code for bootstrap calls this
|
|
* function after setting up the stack and gp registers.
|
|
*/
|
|
NESTED(smp_bootstrap, 16, sp)
|
|
setup_c0_status_sec
|
|
|
|
#ifdef CONFIG_SGI_IP27
|
|
GET_NASID_ASM t1
|
|
dli t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
|
|
KLDIR_OFF_POINTER + CAC_BASE
|
|
dsll t1, NASID_SHFT
|
|
or t0, t0, t1
|
|
ld t0, 0(t0) # t0 points to kern_vars struct
|
|
lh t1, KV_RO_NASID_OFFSET(t0)
|
|
lh t2, KV_RW_NASID_OFFSET(t0)
|
|
MAPPED_KERNEL_SETUP_TLB
|
|
ARC64_TWIDDLE_PC
|
|
#endif /* CONFIG_SGI_IP27 */
|
|
|
|
j start_secondary
|
|
END(smp_bootstrap)
|
|
#endif /* CONFIG_SMP */
|
|
|
|
__FINIT
|
|
|
|
.comm kernelsp, NR_CPUS * 8, 8
|
|
.comm pgd_current, NR_CPUS * 8, 8
|
|
|
|
.comm fw_arg0, SZREG, SZREG # firmware arguments
|
|
.comm fw_arg1, SZREG, SZREG
|
|
.comm fw_arg2, SZREG, SZREG
|
|
.comm fw_arg3, SZREG, SZREG
|
|
|
|
.macro page name, order=0
|
|
.globl \name
|
|
\name: .size \name, (_PAGE_SIZE << \order)
|
|
.org . + (_PAGE_SIZE << \order)
|
|
.type \name, @object
|
|
.endm
|
|
|
|
.data
|
|
.align PAGE_SHIFT
|
|
|
|
/*
|
|
* ... but on 64-bit we've got three-level pagetables with a
|
|
* slightly different layout ...
|
|
*/
|
|
page swapper_pg_dir, _PGD_ORDER
|
|
#ifdef CONFIG_MIPS64
|
|
page invalid_pmd_table, _PMD_ORDER
|
|
#endif
|
|
page invalid_pte_table, _PTE_ORDER
|