diff options
| author | Nico Weber <thakis@chromium.org> | 2021-09-30 09:36:43 -0400 |
|---|---|---|
| committer | Linus Groh <mail@linusgroh.de> | 2021-09-30 15:38:43 +0100 |
| commit | d0c1db5efc88a75a9060208b3196b089afec8baf (patch) | |
| tree | ad40f5b15874821b2da29810cde645792b9261ab /Kernel/Prekernel | |
| parent | 715f9666f2255146e0e50c55324a48528762c135 (diff) | |
| download | serenity-d0c1db5efc88a75a9060208b3196b089afec8baf.zip | |
Kernel: Zero out .bss contents on aarch64
After building and running
objcopy -O binary Build/aarch64/Kernel/Prekernel/Prekernel \
/media/sdcard/kernel8.img
things start booting on an actual RPi4 :^)
(Assuming the sdcard contains RPi firmware, an empty config.txt,
and no other kernel*.img files).
Diffstat (limited to 'Kernel/Prekernel')
| -rw-r--r-- | Kernel/Prekernel/Arch/aarch64/boot.S | 8 | ||||
| -rw-r--r-- | Kernel/Prekernel/Arch/aarch64/linker.ld | 4 |
2 files changed, 12 insertions, 0 deletions
diff --git a/Kernel/Prekernel/Arch/aarch64/boot.S b/Kernel/Prekernel/Arch/aarch64/boot.S index c5eee1a801..7eaa7fa557 100644 --- a/Kernel/Prekernel/Arch/aarch64/boot.S +++ b/Kernel/Prekernel/Arch/aarch64/boot.S @@ -21,6 +21,14 @@ start: ldr x14, =start mov sp, x14 + // Clear BSS. + ldr x14, =start_of_bss + ldr x15, =size_of_bss_divided_by_8 +Lbss_clear_loop: + str xzr, [x14], #8 + subs x15, x15, #1 + bne Lbss_clear_loop + b init .globl wait_cycles diff --git a/Kernel/Prekernel/Arch/aarch64/linker.ld b/Kernel/Prekernel/Arch/aarch64/linker.ld index 9a89f1d4d9..6b093cbd89 100644 --- a/Kernel/Prekernel/Arch/aarch64/linker.ld +++ b/Kernel/Prekernel/Arch/aarch64/linker.ld @@ -29,6 +29,10 @@ SECTIONS .bss ALIGN(4K) (NOLOAD) : AT (ADDR(.bss)) { + start_of_bss = .; *(.bss) + end_of_bss = .; } :bss } + +size_of_bss_divided_by_8 = (end_of_bss - start_of_bss) / 8; |