| 1 | #
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| 2 | # Copyright (c) 2016 Martin Decky
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | #include <abi/asmtool.h>
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| 30 | #include <arch/arch.h>
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| 31 | #include <arch/mm.h>
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| 32 |
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| 33 | #define MCOUNTEREN_CY_MASK 0x00000001
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| 34 | #define MCOUNTEREN_TM_MASK 0x00000002
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| 35 | #define MCOUNTEREN_IR_MASK 0x00000004
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| 36 |
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| 37 | #define MSTATUS_MPP_MASK 0x00001800
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| 38 | #define MSTATUS_MPP_USER 0x00000000
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| 39 | #define MSTATUS_MPP_SUPERVISOR 0x00000800
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| 40 | #define MSTATUS_MPP_MACHINE 0x00001800
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| 41 |
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| 42 | #define MSTATUS_SUM_MASK 0x00040000
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| 43 |
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| 44 | #define SATP_PFN_MASK 0x00000fffffffffff
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| 45 |
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| 46 | #define SATP_MODE_MASK 0xf000000000000000
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| 47 | #define SATP_MODE_BARE 0x0000000000000000
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| 48 | #define SATP_MODE_SV39 0x8000000000000000
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| 49 | #define SATP_MODE_SV48 0x9000000000000000
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| 50 |
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| 51 | .section BOOTSTRAP
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| 52 |
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| 53 | .org DEFAULT_MTVEC + TRAP_VECTOR_RESET
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| 54 | SYMBOL(start)
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| 55 | /* Set up machine state */
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| 56 | li x1, 0
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| 57 | li x2, 0
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| 58 | li x3, 0
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| 59 | li x4, 0
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| 60 | li x5, 0
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| 61 | li x6, 0
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| 62 | li x7, 0
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| 63 | li x8, 0
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| 64 | li x9, 0
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| 65 | li x10, 0
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| 66 | li x11, 0
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| 67 | li x12, 0
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| 68 | li x13, 0
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| 69 | li x14, 0
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| 70 | li x15, 0
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| 71 | li x16, 0
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| 72 | li x17, 0
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| 73 | li x18, 0
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| 74 | li x19, 0
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| 75 | li x20, 0
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| 76 | li x21, 0
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| 77 | li x22, 0
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| 78 | li x23, 0
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| 79 | li x24, 0
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| 80 | li x25, 0
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| 81 | li x26, 0
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| 82 | li x27, 0
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| 83 | li x28, 0
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| 84 | li x29, 0
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| 85 | li x30, 0
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| 86 | li x31, 0
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| 87 |
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| 88 | /* Set up stack, create stack frame */
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| 89 | la sp, boot_stack + BOOT_STACK_SIZE
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| 90 | addi sp, sp, -16
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| 91 |
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| 92 | j bootstrap
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| 93 |
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| 94 | .text
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| 95 |
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| 96 | FUNCTION_BEGIN(jump_to_kernel)
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| 97 | /* Enable performance counters access in supervisor mode */
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| 98 | csrsi mcounteren, MCOUNTEREN_CY_MASK | MCOUNTEREN_TM_MASK | MCOUNTEREN_IR_MASK
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| 99 |
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| 100 | /* Setup SV48 paging for supervisor mode */
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| 101 | la t0, ptl_0
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| 102 | srli t0, t0, 12
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| 103 |
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| 104 | li t1, SATP_PFN_MASK
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| 105 | and t0, t0, t1
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| 106 |
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| 107 | li t1, SATP_MODE_SV48
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| 108 | or t0, t0, t1
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| 109 |
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| 110 | csrw satp, t0
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| 111 |
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| 112 | /* Jump to supervisor mode */
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| 113 | csrr t0, mstatus
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| 114 |
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| 115 | li t1, ~MSTATUS_MPP_MASK
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| 116 | and t0, t0, t1
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| 117 |
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| 118 | /*
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| 119 | * TODO: Enable running with Supervisor User Mode
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| 120 | * access disabled.
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| 121 | */
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| 122 | li t1, MSTATUS_MPP_SUPERVISOR | MSTATUS_SUM_MASK
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| 123 | or t0, t0, t1
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| 124 |
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| 125 | csrw mstatus, t0
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| 126 |
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| 127 | /* Entry point address is in a1. */
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| 128 | mv ra, a1
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| 129 | csrw mepc, ra
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| 130 |
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| 131 | mret
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| 132 | FUNCTION_END(jump_to_kernel)
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| 133 |
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| 134 | FUNCTION_BEGIN(halt)
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| 135 | j halt
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| 136 | FUNCTION_END(halt)
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| 137 |
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| 138 | .data
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| 139 |
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| 140 | .align PAGE_WIDTH
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| 141 | SYMBOL(boot_stack)
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| 142 | .space BOOT_STACK_SIZE
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| 143 |
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| 144 | .section .pt, "aw", @progbits
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| 145 |
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| 146 | .align PAGE_WIDTH
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| 147 | SYMBOL(ptl_0)
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| 148 | .fill 256, 8, 0
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| 149 | /* Identity mapping for [0; 512G) */
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| 150 | .quad 0 + (PTL_DIRTY | PTL_ACCESSED | PTL_EXECUTABLE | PTL_WRITABLE | PTL_READABLE | PTL_VALID)
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| 151 | .fill 255, 8, 0
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