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/*
* 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.
*
* Chris Dearman (chris@mips.com)
* Copyright (C) 2007 Mips Technologies, Inc.
* Copyright (C) 2014 Imagination Technologies Ltd.
*/
#ifndef __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H
#define __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H
#include <asm/regdef.h>
#include <asm/mipsregs.h>
/*
* Prepare segments for EVA boot:
*
* This is in case the processor boots in legacy configuration
* (SI_EVAReset is de-asserted and CONFIG5.K == 0)
*
* ========================= Mappings =============================
* Virtual memory Physical memory Mapping
* 0x00000000 - 0x7fffffff 0x80000000 - 0xfffffffff MUSUK (kuseg)
* Flat 2GB physical memory
*
* 0x80000000 - 0x9fffffff 0x00000000 - 0x1ffffffff MUSUK (kseg0)
* 0xa0000000 - 0xbf000000 0x00000000 - 0x1ffffffff MUSUK (kseg1)
* 0xc0000000 - 0xdfffffff - MK (kseg2)
* 0xe0000000 - 0xffffffff - MK (kseg3)
*
*
* Lowmem is expanded to 2GB
*
* The following code uses the t0, t1, t2 and ra registers without
* previously preserving them.
*
*/
.macro platform_eva_init
.set push
.set reorder
/*
* Get Config.K0 value and use it to program
* the segmentation registers
*/
mfc0 t1, CP0_CONFIG
andi t1, 0x7 /* CCA */
move t2, t1
ins t2, t1, 16, 3
/* SegCtl0 */
li t0, ((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \
(0 << MIPS_SEGCFG_PA_SHIFT) | \
(1 << MIPS_SEGCFG_EU_SHIFT)) | \
(((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \
(0 << MIPS_SEGCFG_PA_SHIFT) | \
(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
or t0, t2
mtc0 t0, CP0_SEGCTL0
/* SegCtl1 */
li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
(0 << MIPS_SEGCFG_PA_SHIFT) | \
(2 << MIPS_SEGCFG_C_SHIFT) | \
(1 << MIPS_SEGCFG_EU_SHIFT)) | \
(((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
(0 << MIPS_SEGCFG_PA_SHIFT) | \
(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
ins t0, t1, 16, 3
mtc0 t0, CP0_SEGCTL1
/* SegCtl2 */
li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
(6 << MIPS_SEGCFG_PA_SHIFT) | \
(1 << MIPS_SEGCFG_EU_SHIFT)) | \
(((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \
(4 << MIPS_SEGCFG_PA_SHIFT) | \
(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
or t0, t2
mtc0 t0, CP0_SEGCTL2
jal mips_ihb
mfc0 t0, $16, 5
li t2, 0x40000000 /* K bit */
or t0, t0, t2
mtc0 t0, $16, 5
sync
jal mips_ihb
.set pop
.endm
.macro kernel_entry_setup
#ifdef CONFIG_EVA
sync
ehb
mfc0 t1, CP0_CONFIG
bgez t1, 9f
mfc0 t0, CP0_CONFIG, 1
bgez t0, 9f
mfc0 t0, CP0_CONFIG, 2
bgez t0, 9f
mfc0 t0, CP0_CONFIG, 3
sll t0, t0, 6 /* SC bit */
bgez t0, 9f
platform_eva_init
b 0f
9:
/* Assume we came from YAMON... */
PTR_LA v0, 0x9fc00534 /* YAMON print */
lw v0, (v0)
move a0, zero
PTR_LA a1, nonsc_processor
jal v0
PTR_LA v0, 0x9fc00520 /* YAMON exit */
lw v0, (v0)
li a0, 1
jal v0
1: b 1b
nop
__INITDATA
nonsc_processor:
.asciz "EVA kernel requires a MIPS core with Segment Control implemented\n"
__FINIT
#endif /* CONFIG_EVA */
0:
.endm
/*
* Do SMP slave processor setup necessary before we can safely execute C code.
*/
.macro smp_slave_setup
#ifdef CONFIG_EVA
sync
ehb
platform_eva_init
#endif
.endm
#endif /* __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H */
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