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| author | wires <wires@noreply.wires.systems> | 2025-03-19 17:09:41 -0400 |
|---|---|---|
| committer | wires <wires@noreply.wires.systems> | 2025-03-19 17:09:41 -0400 |
| commit | 8466e9b4d2fbca85d53d8dadc87914b4766c43de (patch) | |
| tree | 99a0d7a23e805f4ad3e30814ee9a09ebb00ae08b /src | |
| download | zosimos-8466e9b4d2fbca85d53d8dadc87914b4766c43de.tar.gz | |
initial commit
Diffstat (limited to 'src')
| -rw-r--r-- | src/Link.ld | 35 | ||||
| -rw-r--r-- | src/main.zig | 3 | ||||
| -rw-r--r-- | src/startup.s | 28 |
3 files changed, 66 insertions, 0 deletions
diff --git a/src/Link.ld b/src/Link.ld new file mode 100644 index 0000000..aec6d6a --- /dev/null +++ b/src/Link.ld @@ -0,0 +1,35 @@ +ENTRY(_start) +OUTPUT_FORMAT("elf64-littleaarch64") + +SECTIONS { + __kernel_load_address = 0x80000; + __stack_base = __kernel_load_address; + + . = __kernel_load_address; + + .init : { + KEEP(*(.init)) + } + + .text : { + *(.text) + *(.text.*) + *(.gnu.linkonce.t*) + } + + . = ALIGN(CONSTANT(MAXPAGESIZE)); + __bss_start = .; + .bss (NOLOAD) : { + *(.bss*) + *(.gnu.linkonce.b*) + *(COMMON) + } + __bss_end = .; + __bss_size = (__bss_end - __bss_start) / 8; + + . = ALIGN(CONSTANT(COMMONPAGESIZE)); + .rodata : { *(.rodata*) *(.gnu.linkonce.d*) } + + . = ALIGN(CONSTANT(COMMONPAGESIZE)); + .data : { *(.data*) *(.gnu.linkonce.d*) } +} diff --git a/src/main.zig b/src/main.zig new file mode 100644 index 0000000..602f270 --- /dev/null +++ b/src/main.zig @@ -0,0 +1,3 @@ +export fn main() callconv(.C) void { + while (true) {} +} diff --git a/src/startup.s b/src/startup.s new file mode 100644 index 0000000..e0c6385 --- /dev/null +++ b/src/startup.s @@ -0,0 +1,28 @@ +.section ".init" +.global _start + +_start: + mrs x1, MPIDR_EL1 + and x1, x1, 0b11 + + cbz x1, init +halt: + wfe + b halt + +init: + adr x1, __stack_base + mov sp, x1 + + adr x1, __bss_start + adr x2, __bss_size + cbz x2, exec_kernel + +clear_bss: + str xzr, [x1], 8 + sub x2, x2, 1 + cbnz w2, clear_bss + +exec_kernel: + bl main + b halt |