psx 0.1.8

Library for developing homebrew for the Sony PlayStation 1
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//! BIOS function wrappers.
//!
//! This module contains wrappers for functions provided by the BIOS.

use crate::CriticalSection;
use core::ffi::CStr;

pub mod fs;
pub mod gamepad;
pub mod heap;
pub mod kernel;
pub mod rng;
pub mod tty;

/// Calls the given function in an interrupt-free critical section using BIOS
/// syscalls.
///
/// # Safety
///
/// Exception handlers might not support nested exceptions so make sure to not
/// call this from a critical section.
pub unsafe fn critical_section<F: FnMut(&mut CriticalSection) -> R, R>(mut f: F) -> R {
    let changed_state = unsafe { kernel::psx_enter_critical_section() };
    // SAFETY: We are in a critical section so we can create this
    let mut cs = unsafe { CriticalSection::new() };
    let res = f(&mut cs);
    if changed_state {
        unsafe {
            kernel::psx_exit_critical_section();
        }
    };
    res
}

/// Returns the kernel's version string.
pub fn get_system_version() -> &'static CStr {
    // SAFETY: Calling get_system_info with index 2 gives a pointer with a
    // static lifetime to the version string. There are no safety requirement.
    let version = unsafe { kernel::psx_get_system_info(2) as *const i8 };
    // SAFETY: Let's hope the BIOS returned a pointer to a null-terminated string
    // to its own memory.
    unsafe { CStr::from_ptr(version) }
}

/// Returns the kernel's date in BCD (e.g. 0x19951204).
pub fn get_system_date() -> u32 {
    unsafe { kernel::psx_get_system_info(0) }
}