1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Chris Dearman (chris@mips.com) 7 * Copyright (C) 2007 Mips Technologies, Inc. 8 * Copyright (C) 2014 Imagination Technologies Ltd. 9 */ 10 #ifndef __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H 11 #define __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H 12 13 #include <asm/regdef.h> 14 #include <asm/mipsregs.h> 15 16 /* 17 * Prepare segments for EVA boot: 18 * 19 * This is in case the processor boots in legacy configuration 20 * (SI_EVAReset is de-asserted and CONFIG5.K == 0) 21 * 22 * ========================= Mappings ============================= 23 * Virtual memory Physical memory Mapping 24 * 0x00000000 - 0x7fffffff 0x80000000 - 0xfffffffff MUSUK (kuseg) 25 * Flat 2GB physical memory 26 * 27 * 0x80000000 - 0x9fffffff 0x00000000 - 0x1ffffffff MUSUK (kseg0) 28 * 0xa0000000 - 0xbf000000 0x00000000 - 0x1ffffffff MUSUK (kseg1) 29 * 0xc0000000 - 0xdfffffff - MK (kseg2) 30 * 0xe0000000 - 0xffffffff - MK (kseg3) 31 * 32 * 33 * Lowmem is expanded to 2GB 34 * 35 * The following code uses the t0, t1, t2 and ra registers without 36 * previously preserving them. 37 * 38 */ 39 .macro platform_eva_init 40 41 .set push 42 .set reorder 43 /* 44 * Get Config.K0 value and use it to program 45 * the segmentation registers 46 */ 47 mfc0 t1, CP0_CONFIG 48 andi t1, 0x7 /* CCA */ 49 move t2, t1 50 ins t2, t1, 16, 3 51 /* SegCtl0 */ 52 li t0, ((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \ 53 (0 << MIPS_SEGCFG_PA_SHIFT) | \ 54 (1 << MIPS_SEGCFG_EU_SHIFT)) | \ 55 (((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) | \ 56 (0 << MIPS_SEGCFG_PA_SHIFT) | \ 57 (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) 58 or t0, t2 59 mtc0 t0, $5, 2 60 61 /* SegCtl1 */ 62 li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ 63 (0 << MIPS_SEGCFG_PA_SHIFT) | \ 64 (2 << MIPS_SEGCFG_C_SHIFT) | \ 65 (1 << MIPS_SEGCFG_EU_SHIFT)) | \ 66 (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ 67 (0 << MIPS_SEGCFG_PA_SHIFT) | \ 68 (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) 69 ins t0, t1, 16, 3 70 mtc0 t0, $5, 3 71 72 /* SegCtl2 */ 73 li t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ 74 (6 << MIPS_SEGCFG_PA_SHIFT) | \ 75 (1 << MIPS_SEGCFG_EU_SHIFT)) | \ 76 (((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) | \ 77 (4 << MIPS_SEGCFG_PA_SHIFT) | \ 78 (1 << MIPS_SEGCFG_EU_SHIFT)) << 16) 79 or t0, t2 80 mtc0 t0, $5, 4 81 82 jal mips_ihb 83 mfc0 t0, $16, 5 84 li t2, 0x40000000 /* K bit */ 85 or t0, t0, t2 86 mtc0 t0, $16, 5 87 sync 88 jal mips_ihb 89 90 .set pop 91 .endm 92 93 .macro kernel_entry_setup 94 95 #ifdef CONFIG_EVA 96 sync 97 ehb 98 99 mfc0 t1, CP0_CONFIG 100 bgez t1, 9f 101 mfc0 t0, CP0_CONFIG, 1 102 bgez t0, 9f 103 mfc0 t0, CP0_CONFIG, 2 104 bgez t0, 9f 105 mfc0 t0, CP0_CONFIG, 3 106 sll t0, t0, 6 /* SC bit */ 107 bgez t0, 9f 108 109 platform_eva_init 110 b 0f 111 9: 112 /* Assume we came from YAMON... */ 113 PTR_LA v0, 0x9fc00534 /* YAMON print */ 114 lw v0, (v0) 115 move a0, zero 116 PTR_LA a1, nonsc_processor 117 jal v0 118 119 PTR_LA v0, 0x9fc00520 /* YAMON exit */ 120 lw v0, (v0) 121 li a0, 1 122 jal v0 123 124 1: b 1b 125 nop 126 __INITDATA 127 nonsc_processor: 128 .asciz "EVA kernel requires a MIPS core with Segment Control implemented\n" 129 __FINIT 130 #endif /* CONFIG_EVA */ 131 0: 132 .endm 133 134 /* 135 * Do SMP slave processor setup necessary before we can safely execute C code. 136 */ 137 .macro smp_slave_setup 138 #ifdef CONFIG_EVA 139 sync 140 ehb 141 platform_eva_init 142 #endif 143 .endm 144 145 #endif /* __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H */ 146