enderice2/Fennix
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kernel: update boot code and linker script for aarch64

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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
This commit is contained in:
EnderIce2 2025-01-13 09:22:01 +02:00
parent 210e06429c
commit 749a1b1810
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GPG Key ID: 2EE20AF089811A5A
3 changed files with 115 additions and 46 deletions
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67
Kernel/arch/aarch64/bootstrap/boot.S
View File

@ -1,36 +1,49 @@
/* Based on this tutorial:
https://github.com/s-matyukevich/raspberry-pi-os */
/*
This file is part of Fennix Kernel.
.section ".text.boot", "a"
Fennix Kernel is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
.extern _bss_start
.extern _bss_end
Fennix Kernel is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
.extern arm64Entry
memzero:
str xzr, [x0], #8
subs x1, x1, #8
b.gt memzero
ret
You should have received a copy of the GNU General Public License
along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/
.section ".bootstrap.boot", "a"
.extern _kernel_bss_start
.extern _kernel_bss_end
.extern _kernel_bss_size
.global _start
_start:
mrs x0, mpidr_el1
and x0, x0, #0xFF
cbz x0, _start2
b CPU_Loop
/* Keep only the main core */
mrs x1, mpidr_el1
and x1, x1, #3
cbz x1, 2f
_start2:
adr x0, _bss_start
adr x1, _bss_end
sub x1, x1, x0
bl memzero
mov sp, #0x200000
bl arm64Entry
/* Halt */
1: wfe
b 1b
Halt:
wfe
b Halt
/* Initialize the stack */
2: ldr x1, =_start
mov sp, x1
CPU_Loop:
b CPU_Loop
/* Clear the BSS */
ldr x1, =_kernel_bss_start
ldr w2, =_kernel_bss_size
3: cbz w2, 4f
str xzr, [x1], #8
sub w2, w2, #1
cbnz w2, 3b
/* Start the kernel */
4: bl _aarch64_start
b 1b

24
Kernel/arch/aarch64/bootstrap/init.c Normal file
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@ -0,0 +1,24 @@
/*
This file is part of Fennix Kernel.
Fennix Kernel is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
Fennix Kernel is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/
#include <types.h>
__attribute__((section(".bootstrap.text"))) void _aarch64_start(uint64_t dtb_ptr32, uint64_t x1, uint64_t x2, uint64_t x3)
{
while (1)
;
}

70
Kernel/arch/aarch64/linker.ld
View File

@ -20,43 +20,60 @@ OUTPUT_ARCH(aarch64)
ENTRY(_start)
PF_R = 0x4;
PF_W = 0x2;
PF_X = 0x1;
PHDRS
{
bootstrap PT_LOAD FLAGS( PF_R | PF_W /*| PF_X*/ );
text PT_LOAD FLAGS( PF_R | PF_X );
data PT_LOAD FLAGS( PF_R | PF_W );
rodata PT_LOAD FLAGS( PF_R );
bss PT_LOAD FLAGS( PF_R | PF_W );
}
SECTIONS
{
. = 0x80000;
_bootstrap_start = .;
.text.boot :
.bootstrap :
{
*(.text.boot)
. += CONSTANT(MAXPAGESIZE);
_bss_start = .;
*(.text.bss)
_bss_end = .;
}
*(.bootstrap.boot .bootstrap.boot.*)
*(.bootstrap .bootstrap.*)
} :bootstrap
_bootstrap_end = .;
_kernel_start = .;
_kernel_text_start = .;
.text :
{
KEEP(*(.text.boot))
*(.text .text.*)
}
. = ALIGN(4096);
} :text
_kernel_text_end = .;
_kernel_data_start = .;
.data :
{
*(.data .data.*)
}
. = ALIGN(4096);
} :data
.eh_frame :
{
KEEP (*(.eh_frame .eh_frame.*))
} :data
.gcc_except_table :
{
KEEP (*(.gcc_except_table .gcc_except_table.*))
} :data
_kernel_data_end = .;
_kernel_rodata_start = .;
.rodata :
{
*(.rodata .rodata.*)
}
. = ALIGN(4096);
} :rodata
.init_array :
{
@ -64,7 +81,7 @@ SECTIONS
KEEP(*(.init_array .ctors))
KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
PROVIDE_HIDDEN (__init_array_end = .);
}
} :rodata
.fini_array :
{
@ -72,18 +89,33 @@ SECTIONS
KEEP(*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
KEEP(*(.fini_array .dtors))
PROVIDE_HIDDEN (__fini_array_end = .);
}
} :rodata
.eh_frame_hdr :
{
*(.eh_frame_hdr .eh_frame_hdr.*)
} :rodata
.eh_frame :
{
KEEP (*(.eh_frame .eh_frame.*))
} :rodata
.gcc_except_table :
{
KEEP (*(.gcc_except_table .gcc_except_table.*))
} :rodata
_kernel_rodata_end = .;
_kernel_bss_start = .;
.bss :
{
*(COMMON)
*(.bss .bss.*)
}
. = ALIGN(4096);
} :bss
_kernel_bss_end = .;
_kernel_bss_size = SIZEOF(.bss);
_kernel_end = .;
_bss_size = _kernel_end - _kernel_rodata_end;
/DISCARD/ :
{