From 2bc8a824fd424aa3e21bc394fd0be3191b830888 Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Mon, 9 Nov 2026 23:42:19 +0800 Subject: [mubios] Initialize the 8042 keyboard controller POST only unmasked IRQ1 in the PIC and never configured the 8042 itself, so the keyboard stayed in its post-reset disabled state: the clock was inhibited and no scan code ever reached the output buffer. IRQ1 never fired, the BDA keyboard buffer stayed empty, and GRUB polling INT 16h AH=01h never saw a key. Add kbd_init() to disable both ports, drain the output buffer, clear the clock inhibit bits in the command byte, enable the keyboard and auxiliary IRQs and select set 1 translation, then enable scanning with 0xF4. The IRQ1 handler now checks the status register for a pending output byte before reading the data port and drops auxiliary port bytes. The set 2 break prefix tracking is gone because translation is enabled. --- mubios/services/int16.c | 15 ++------------- 1 file changed, 2 insertions(+), 13 deletions(-) (limited to 'mubios/services/int16.c') diff --git a/mubios/services/int16.c b/mubios/services/int16.c index 5872fb1..cadc1ff 100644 --- a/mubios/services/int16.c +++ b/mubios/services/int16.c @@ -17,6 +17,7 @@ */ #include "bios.h" +#include "io.h" #include "regs.h" #define BIOS_ZF 0x0040u @@ -26,18 +27,6 @@ #define BDA_KBD_BUFFER_START 0x001Eu #define BDA_KBD_BUFFER_END 0x003Eu -static u8 -normalize_scancode (u8 scancode) -{ - switch (scancode) - { - case 0x5Au: - return 0x1Cu; - default: - return scancode; - } -} - static u8 scancode_to_ascii (u8 scancode) { @@ -138,7 +127,7 @@ int16_service (struct bios_regs *regs) position = *head; value = buffer[(position - BDA_KBD_BUFFER_START) >> 1]; - scancode = normalize_scancode ((u8)(value >> 8)); + scancode = (u8)(value >> 8); ascii = scancode_to_ascii (scancode); regs->eax = ((u32)scancode << 8) | ascii; -- cgit v1.2.3