c25ba1fccd
- PS/2 keyboard driver: IRQ1 handler, scancode set 1 translation, ring buffer, shift key support - SYS_READ (fd=0): non-blocking keyboard read for stdin - SYS_YIELD: calls schedule_tick directly (no nested INT 0x80) - SYS_EXEC: loads binary from CPIO initrd, replaces process image - User-space libc: crt0.S (C runtime startup), syscalls.h (inline syscall wrappers, basic string functions) - Shell app (sh): readline with echo/backspace, builtins (cd, env, help, exit), fork+exec for external commands - Updated build_apps.sh: C app support with crt0 linking, libc include path, .bss section in objcopy Tested: shell boots, keyboard input works, hello-world runs via fork+exec, env shows CWD, exit cleanly terminates.
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/**
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* @file keyboard.h
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* @brief PS/2 keyboard driver.
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*
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* Handles IRQ1 keyboard interrupts, translates scancodes to ASCII,
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* and provides a ring buffer for user-space reading via SYS_READ.
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*/
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#ifndef KEYBOARD_H
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#define KEYBOARD_H
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#include <stdint.h>
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#include "isr.h"
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/** Keyboard input buffer size. */
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#define KB_BUFFER_SIZE 256
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/**
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* Initialize the keyboard driver.
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*/
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void keyboard_init(void);
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/**
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* Handle a keyboard IRQ (called from isr_handler for IRQ1).
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*
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* @param regs Register state (may be used to wake blocked processes).
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*/
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void keyboard_irq(registers_t *regs);
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/**
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* Read characters from the keyboard buffer.
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* Non-blocking: returns whatever is available, 0 if empty.
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*
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* @param buf Destination buffer.
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* @param count Maximum bytes to read.
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* @return Number of bytes read.
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*/
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uint32_t keyboard_read(char *buf, uint32_t count);
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/**
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* Check if there is data available in the keyboard buffer.
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*
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* @return Non-zero if data is available.
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*/
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int keyboard_has_data(void);
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/**
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* Block the given process until keyboard data is available.
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* Sets the process to BLOCKED state and records it as waiting for keyboard.
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* When data arrives, the process will be unblocked.
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*
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* @param regs Current interrupt frame (for saving process state).
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*/
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void keyboard_block_for_input(registers_t *regs);
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#endif /* KEYBOARD_H */
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