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linux/arch/csky/kernel/entry.S
Guo Ren 0c8a32eed1 csky: Add memory layout 2.5G(user):1.5G(kernel) 
There are two ways for translating va to pa for csky:
 - Use TLB(Translate Lookup Buffer) and PTW (Page Table Walk)
 - Use SSEG0/1 (Simple Segment Mapping)

We use tlb mapping 0-2G and 3G-4G virtual address area and SSEG0/1
are for 2G-2.5G and 2.5G-3G translation. We could disable SSEG0
to use 2G-2.5G as TLB user mapping.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2021-01-12 09:52:40 +08:00

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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/linkage.h>
#include <abi/entry.h>
#include <abi/pgtable-bits.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/unistd.h>
#include <asm/asm-offsets.h>
#include <linux/threads.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/thread_info.h>
#define PTE_INDX_MSK 0xffc
#define PTE_INDX_SHIFT 10
#define _PGDIR_SHIFT 22
.macro zero_fp
#ifdef CONFIG_STACKTRACE
movi r8, 0
#endif
.endm
.macro context_tracking
#ifdef CONFIG_CONTEXT_TRACKING
mfcr a0, epsr
btsti a0, 31
bt 1f
jbsr context_tracking_user_exit
ldw a0, (sp, LSAVE_A0)
ldw a1, (sp, LSAVE_A1)
ldw a2, (sp, LSAVE_A2)
ldw a3, (sp, LSAVE_A3)
#if defined(__CSKYABIV1__)
ldw r6, (sp, LSAVE_A4)
ldw r7, (sp, LSAVE_A5)
#endif
1:
#endif
.endm
.macro tlbop_begin name, val0, val1, val2
ENTRY(csky_\name)
mtcr a3, ss2
mtcr r6, ss3
mtcr a2, ss4
RD_PGDR r6
RD_MEH a3
WR_MEH a3
#ifdef CONFIG_CPU_HAS_TLBI
tlbi.vaas a3
sync.is
btsti a3, 31
bf 1f
RD_PGDR_K r6
1:
#else
bgeni a2, 31
WR_MCIR a2
bgeni a2, 25
WR_MCIR a2
#endif
bclri r6, 0
lrw a2, PAGE_OFFSET
add r6, a2
lrw a2, va_pa_offset
ld.w a2, (a2, 0)
subu r6, a2
mov a2, a3
lsri a2, _PGDIR_SHIFT
lsli a2, 2
addu r6, a2
ldw r6, (r6)
lrw a2, PAGE_OFFSET
add r6, a2
lrw a2, va_pa_offset
ld.w a2, (a2, 0)
subu r6, a2
lsri a3, PTE_INDX_SHIFT
lrw a2, PTE_INDX_MSK
and a3, a2
addu r6, a3
ldw a3, (r6)
movi a2, (_PAGE_PRESENT | \val0)
and a3, a2
cmpne a3, a2
bt \name
/* First read/write the page, just update the flags */
ldw a3, (r6)
bgeni a2, PAGE_VALID_BIT
bseti a2, PAGE_ACCESSED_BIT
bseti a2, \val1
bseti a2, \val2
or a3, a2
stw a3, (r6)
/* Some cpu tlb-hardrefill bypass the cache */
#ifdef CONFIG_CPU_NEED_TLBSYNC
movi a2, 0x22
bseti a2, 6
mtcr r6, cr22
mtcr a2, cr17
sync
#endif
mfcr a3, ss2
mfcr r6, ss3
mfcr a2, ss4
rte
\name:
mfcr a3, ss2
mfcr r6, ss3
mfcr a2, ss4
SAVE_ALL 0
.endm
.macro tlbop_end is_write
zero_fp
context_tracking
RD_MEH a2
psrset ee, ie
mov a0, sp
movi a1, \is_write
jbsr do_page_fault
jmpi ret_from_exception
.endm
.text
tlbop_begin tlbinvalidl, _PAGE_READ, PAGE_VALID_BIT, PAGE_ACCESSED_BIT
tlbop_end 0
tlbop_begin tlbinvalids, _PAGE_WRITE, PAGE_DIRTY_BIT, PAGE_MODIFIED_BIT
tlbop_end 1
tlbop_begin tlbmodified, _PAGE_WRITE, PAGE_DIRTY_BIT, PAGE_MODIFIED_BIT
#ifndef CONFIG_CPU_HAS_LDSTEX
jbsr csky_cmpxchg_fixup
#endif
tlbop_end 1
ENTRY(csky_systemcall)
SAVE_ALL TRAP0_SIZE
zero_fp
context_tracking
psrset ee, ie
lrw r9, __NR_syscalls
cmphs syscallid, r9 /* Check nr of syscall */
bt 1f
lrw r9, sys_call_table
ixw r9, syscallid
ldw syscallid, (r9)
cmpnei syscallid, 0
bf ret_from_exception
mov r9, sp
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r10, (r9, TINFO_FLAGS)
lrw r9, _TIF_SYSCALL_WORK
and r10, r9
cmpnei r10, 0
bt csky_syscall_trace
#if defined(__CSKYABIV2__)
subi sp, 8
stw r5, (sp, 0x4)
stw r4, (sp, 0x0)
jsr syscallid /* Do system call */
addi sp, 8
#else
jsr syscallid
#endif
stw a0, (sp, LSAVE_A0) /* Save return value */
1:
#ifdef CONFIG_DEBUG_RSEQ
mov a0, sp
jbsr rseq_syscall
#endif
jmpi ret_from_exception
csky_syscall_trace:
mov a0, sp /* sp = pt_regs pointer */
jbsr syscall_trace_enter
cmpnei a0, 0
bt 1f
/* Prepare args before do system call */
ldw a0, (sp, LSAVE_A0)
ldw a1, (sp, LSAVE_A1)
ldw a2, (sp, LSAVE_A2)
ldw a3, (sp, LSAVE_A3)
#if defined(__CSKYABIV2__)
subi sp, 8
ldw r9, (sp, LSAVE_A4)
stw r9, (sp, 0x0)
ldw r9, (sp, LSAVE_A5)
stw r9, (sp, 0x4)
jsr syscallid /* Do system call */
addi sp, 8
#else
ldw r6, (sp, LSAVE_A4)
ldw r7, (sp, LSAVE_A5)
jsr syscallid /* Do system call */
#endif
stw a0, (sp, LSAVE_A0) /* Save return value */
1:
#ifdef CONFIG_DEBUG_RSEQ
mov a0, sp
jbsr rseq_syscall
#endif
mov a0, sp /* right now, sp --> pt_regs */
jbsr syscall_trace_exit
br ret_from_exception
ENTRY(ret_from_kernel_thread)
jbsr schedule_tail
mov a0, r10
jsr r9
jbsr ret_from_exception
ENTRY(ret_from_fork)
jbsr schedule_tail
mov r9, sp
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r10, (r9, TINFO_FLAGS)
lrw r9, _TIF_SYSCALL_WORK
and r10, r9
cmpnei r10, 0
bf ret_from_exception
mov a0, sp /* sp = pt_regs pointer */
jbsr syscall_trace_exit
ret_from_exception:
psrclr ie
ld r9, (sp, LSAVE_PSR)
btsti r9, 31
bt 1f
/*
* Load address of current->thread_info, Then get address of task_struct
* Get task_needreshed in task_struct
*/
mov r9, sp
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r10, (r9, TINFO_FLAGS)
lrw r9, _TIF_WORK_MASK
and r10, r9
cmpnei r10, 0
bt exit_work
#ifdef CONFIG_CONTEXT_TRACKING
jbsr context_tracking_user_enter
#endif
1:
#ifdef CONFIG_PREEMPTION
mov r9, sp
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r10, (r9, TINFO_PREEMPT)
cmpnei r10, 0
bt 2f
jbsr preempt_schedule_irq /* irq en/disable is done inside */
2:
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
ld r10, (sp, LSAVE_PSR)
btsti r10, 6
bf 2f
jbsr trace_hardirqs_on
2:
#endif
RESTORE_ALL
exit_work:
lrw r9, ret_from_exception
mov lr, r9
btsti r10, TIF_NEED_RESCHED
bt work_resched
psrset ie
mov a0, sp
mov a1, r10
jmpi do_notify_resume
work_resched:
jmpi schedule
ENTRY(csky_trap)
SAVE_ALL 0
zero_fp
context_tracking
psrset ee
mov a0, sp /* Push Stack pointer arg */
jbsr trap_c /* Call C-level trap handler */
jmpi ret_from_exception
/*
 * Prototype from libc for abiv1:
 * register unsigned int __result asm("a0");
 * asm( "trap 3" :"=r"(__result)::);
 */
ENTRY(csky_get_tls)
USPTOKSP
RD_MEH a0
WR_MEH a0
/* increase epc for continue */
mfcr a0, epc
addi a0, TRAP0_SIZE
mtcr a0, epc
/* get current task thread_info with kernel 8K stack */
bmaski a0, THREAD_SHIFT
not a0
subi sp, 1
and a0, sp
addi sp, 1
/* get tls */
ldw a0, (a0, TINFO_TP_VALUE)
KSPTOUSP
rte
ENTRY(csky_irq)
SAVE_ALL 0
zero_fp
context_tracking
psrset ee
#ifdef CONFIG_TRACE_IRQFLAGS
jbsr trace_hardirqs_off
#endif
mov a0, sp
jbsr csky_do_IRQ
jmpi ret_from_exception
/*
* a0 = prev task_struct *
* a1 = next task_struct *
* a0 = return next
*/
ENTRY(__switch_to)
lrw a3, TASK_THREAD
addu a3, a0
SAVE_SWITCH_STACK
stw sp, (a3, THREAD_KSP)
/* Set up next process to run */
lrw a3, TASK_THREAD
addu a3, a1
ldw sp, (a3, THREAD_KSP) /* Set next kernel sp */
#if defined(__CSKYABIV2__)
addi a3, a1, TASK_THREAD_INFO
ldw tls, (a3, TINFO_TP_VALUE)
#endif
RESTORE_SWITCH_STACK
rts
ENDPROC(__switch_to)
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