diff options
| author | Ian Moffett <ian@osmora.org> | 2025-11-16 16:38:26 -0500 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2025-11-16 16:54:43 -0500 |
| commit | 0fbb43a96646c0d8d593f5d72b3cafc9b6ac4773 (patch) | |
| tree | b3367486eec5ea5861f01eef5171b787d17229c6 /sys/arch | |
| parent | 14f44e5b4a7513931b1371b5042d212a6a07ac1e (diff) | |
kern/amd64: cpu: Disable master/slave i8259 chips
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/amd64/cpu/boot.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sys/arch/amd64/cpu/boot.S b/sys/arch/amd64/cpu/boot.S index 26b2b8b..0cda6a7 100644 --- a/sys/arch/amd64/cpu/boot.S +++ b/sys/arch/amd64/cpu/boot.S @@ -45,6 +45,15 @@ _start: call gdt_load /* Load our GDT */ call idt_load /* Load our IDT */ + /* + * RV7 will default to APIC operation, as per a section + * somewhere around 5.2.12 of the ACPI spec, we'll need + * to disable the PC-AT dual 8259 chips. + */ + mov $0xFF, %al /* Mask all inputs */ + out %al, $0x21 /* Disable the master PIC */ + out %al, $0xA1 /* Disable the slave PIC */ + lea bootmsg(%rip), %rdi call uart_puts |