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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef __ASM_CSKY_ENTRY_H
#define __ASM_CSKY_ENTRY_H
#include <asm/setup.h>
#include <abi/regdef.h>
#define LSAVE_PC 8
#define LSAVE_PSR 12
#define LSAVE_A0 24
#define LSAVE_A1 28
#define LSAVE_A2 32
#define LSAVE_A3 36
#define KSPTOUSP
#define USPTOKSP
#define usp cr<14, 1>
.macro SAVE_ALL epc_inc
subi sp, 152
stw tls, (sp, 0)
stw lr, (sp, 4)
mfcr lr, epc
movi tls, \epc_inc
add lr, tls
stw lr, (sp, 8)
mfcr lr, epsr
stw lr, (sp, 12)
btsti lr, 31
bf 1f
addi lr, sp, 152
br 2f
1:
mfcr lr, usp
2:
stw lr, (sp, 16)
stw a0, (sp, 20)
stw a0, (sp, 24)
stw a1, (sp, 28)
stw a2, (sp, 32)
stw a3, (sp, 36)
addi sp, 40
stm r4-r13, (sp)
addi sp, 40
stm r16-r30, (sp)
#ifdef CONFIG_CPU_HAS_HILO
mfhi lr
stw lr, (sp, 60)
mflo lr
stw lr, (sp, 64)
mfcr lr, cr14
stw lr, (sp, 68)
#endif
subi sp, 80
.endm
.macro RESTORE_ALL
psrclr ie
ldw tls, (sp, 0)
ldw lr, (sp, 4)
ldw a0, (sp, 8)
mtcr a0, epc
ldw a0, (sp, 12)
mtcr a0, epsr
btsti a0, 31
ldw a0, (sp, 16)
mtcr a0, usp
mtcr a0, ss0
#ifdef CONFIG_CPU_HAS_HILO
ldw a0, (sp, 140)
mthi a0
ldw a0, (sp, 144)
mtlo a0
ldw a0, (sp, 148)
mtcr a0, cr14
#endif
ldw a0, (sp, 24)
ldw a1, (sp, 28)
ldw a2, (sp, 32)
ldw a3, (sp, 36)
addi sp, 40
ldm r4-r13, (sp)
addi sp, 40
ldm r16-r30, (sp)
addi sp, 72
bf 1f
mfcr sp, ss0
1:
rte
.endm
.macro SAVE_SWITCH_STACK
subi sp, 64
stm r4-r11, (sp)
stw lr, (sp, 32)
stw r16, (sp, 36)
stw r17, (sp, 40)
stw r26, (sp, 44)
stw r27, (sp, 48)
stw r28, (sp, 52)
stw r29, (sp, 56)
stw r30, (sp, 60)
#ifdef CONFIG_CPU_HAS_HILO
subi sp, 16
mfhi lr
stw lr, (sp, 0)
mflo lr
stw lr, (sp, 4)
mfcr lr, cr14
stw lr, (sp, 8)
#endif
.endm
.macro RESTORE_SWITCH_STACK
#ifdef CONFIG_CPU_HAS_HILO
ldw lr, (sp, 0)
mthi lr
ldw lr, (sp, 4)
mtlo lr
ldw lr, (sp, 8)
mtcr lr, cr14
addi sp, 16
#endif
ldm r4-r11, (sp)
ldw lr, (sp, 32)
ldw r16, (sp, 36)
ldw r17, (sp, 40)
ldw r26, (sp, 44)
ldw r27, (sp, 48)
ldw r28, (sp, 52)
ldw r29, (sp, 56)
ldw r30, (sp, 60)
addi sp, 64
.endm
/* MMU registers operators. */
.macro RD_MIR rx
mfcr \rx, cr<0, 15>
.endm
.macro RD_MEH rx
mfcr \rx, cr<4, 15>
.endm
.macro RD_MCIR rx
mfcr \rx, cr<8, 15>
.endm
.macro RD_PGDR rx
mfcr \rx, cr<29, 15>
.endm
.macro RD_PGDR_K rx
mfcr \rx, cr<28, 15>
.endm
.macro WR_MEH rx
mtcr \rx, cr<4, 15>
.endm
.macro WR_MCIR rx
mtcr \rx, cr<8, 15>
.endm
.macro SETUP_MMU
/* Init psr and enable ee */
lrw r6, DEFAULT_PSR_VALUE
mtcr r6, psr
psrset ee
/* Invalid I/Dcache BTB BHT */
movi r6, 7
lsli r6, 16
addi r6, (1<<4) | 3
mtcr r6, cr17
/* Invalid all TLB */
bgeni r6, 26
mtcr r6, cr<8, 15> /* Set MCIR */
/* Check MMU on/off */
mfcr r6, cr18
btsti r6, 0
bt 1f
/* MMU off: setup mapping tlb entry */
movi r6, 0
mtcr r6, cr<6, 15> /* Set MPR with 4K page size */
grs r6, 1f /* Get current pa by PC */
bmaski r7, (PAGE_SHIFT + 1) /* r7 = 0x1fff */
andn r6, r7
mtcr r6, cr<4, 15> /* Set MEH */
mov r8, r6
movi r7, 0x00000006
or r8, r7
mtcr r8, cr<2, 15> /* Set MEL0 */
movi r7, 0x00001006
or r8, r7
mtcr r8, cr<3, 15> /* Set MEL1 */
bgeni r8, 28
mtcr r8, cr<8, 15> /* Set MCIR to write TLB */
br 2f
1:
/*
* MMU on: use origin MSA value from bootloader
*
* cr<30/31, 15> MSA register format:
* 31 - 29 | 28 - 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
* BA Reserved SH WA B SO SEC C D V
*/
mfcr r6, cr<30, 15> /* Get MSA0 */
2:
lsri r6, 28
lsli r6, 28
addi r6, 0x1ce
mtcr r6, cr<30, 15> /* Set MSA0 */
lsri r6, 28
addi r6, 2
lsli r6, 28
addi r6, 0x1ce
mtcr r6, cr<31, 15> /* Set MSA1 */
/* enable MMU */
mfcr r6, cr18
bseti r6, 0
mtcr r6, cr18
jmpi 3f /* jump to va */
3:
.endm
.macro ANDI_R3 rx, imm
lsri \rx, 3
andi \rx, (\imm >> 3)
.endm
#endif /* __ASM_CSKY_ENTRY_H */
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