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boot64.s
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boot64.s
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/* Copyright (C) 2013 by John Cronin <jncronin@tysos.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
.section ".text.boot"
.globl Start
Start:
adr x20, stack + (1 << 15)
mov sp, x20
/* Clear out bss */
ldr x4, =_bss_start
ldr x9, =_bss_end
mov x5, #0
mov x6, #0
b .test
.loop:
/* this does 2x8 = 16 byte stores at once */
stp x5, x6, [x4, #0]
add x4, x4, #16
.test:
cmp x4, x9
blo .loop
/* branch and link to kernel_main */
bl kernel_main
halt:
wfe /* equivalent of x86 HLT instruction */
b halt
.globl flush_cache
flush_cache:
mov x0, #0
/* XXX, not used in QEMU */
ret
.globl memory_barrier
memory_barrier:
mov x0, #0
dmb sy
ret
.globl read_sctlr
read_sctlr:
mrs x0, sctlr_el2
ret
.globl quick_memcpy
quick_memcpy:
mov x10, x0
mov x11, x1
.loopb:
ldp x12, x13, [x11, #0]
add x11, x11, #16
stp x12, x13, [x10, #0]
add x10, x10, #16
sub x2, x2, #16
cmp x2, #0
bhi .loopb
ret
.section ".bss"
.align 4 /* Align on 128bit boundary */
stack:
.align 15 /* Reserve 32kb of stack */